AI Trajectory

Trajectory: (Expand/Collapse All)
Seq	Timestamp	Type	Name	Duration
0/0	2026/09/15 14:23	flow	patch-triage	26m Args: null Results: { "EnableConfigs": [ "DRM", "DRM_VIRTIO_GPU", "EVENTFD" ], "FocusSymbols": [ "drm_syncobj_eventfd_ioctl", "eventfd_ctx_put" ], "KMSANReasoning": "The patch introduces a `__free(eventfd)` cleanup helper using the `DEFINE_FREE` macro and refactors `drm_syncobj_eventfd_ioctl()` to use automatic resource management (`__free` and `no_free_ptr`) for `struct eventfd_ctx`. Additionally, `eventfd_ctx_put()` is updated to safely handle `NULL` or error pointers via `IS_ERR_OR_NULL(ctx)`.\n\nThese changes concern pointer lifetime and resource deallocation. The local pointer `ev_fd_ctx` is explicitly initialized to `NULL`, and the heap allocation `entry` continues to be zero-allocated via `kzalloc_obj()`. No uninitialized memory, padding bytes, or user-space copies are introduced or altered. Any potential bugs would relate to reference counting, resource leaks, or pointer cleanup, which fall under standard KASAN/refcount tracking rather than KMSAN uninitialized memory detection. Therefore, a dedicated KMSAN fuzzing session is not warranted.", "NeedsKMSAN": false, "Reasoning": "The patch updates eventfd_ctx_put() in fs/eventfd.c to safely handle IS_ERR_OR_NULL pointers and introduces the DEFINE_FREE(eventfd, ...) scoped cleanup helper, which is then used to refactor resource release and error paths in drm_syncobj_eventfd_ioctl(). The modified code is executable and fully reachable from userspace via virtio-gpu in standard QEMU environments (which supports DRIVER_SYNCOBJ_TIMELINE). Fuzzing is warranted to verify that the cleanup attribute handling and new NULL/ERR checks do not introduce reference leaks, double puts, or other regressions under error paths.", "WorthFuzzing": true }
1/1	2026/09/15 14:23	action	read-patch-diff	0m Args: null Results: { "PatchDiff": "commit c5df43be3ebc21de489c5599cca83bfbb4cd878c\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Tue Sep 15 14:23:02 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c\nindex c23a5de27effa..efc4e8af220c8 100644\n--- a/drivers/gpu/drm/drm_syncobj.c\n+++ b/drivers/gpu/drm/drm_syncobj.c\n@@ -1462,9 +1462,9 @@ int\n drm_syncobj_eventfd_ioctl(struct drm_device dev, void data,\n \t\t\t struct drm_file file_private)\n {\n+\tstruct eventfd_ctx ev_fd_ctx __free(eventfd) = NULL;\n \tstruct drm_syncobj_eventfd args = data;\n \tstruct drm_syncobj syncobj;\n-\tstruct eventfd_ctx ev_fd_ctx;\n \tstruct syncobj_eventfd_entry entry;\n \tint ret;\n \n@@ -1490,10 +1490,10 @@ drm_syncobj_eventfd_ioctl(struct drm_device dev, void data,\n \tentry = kzalloc_obj(entry);\n \tif (!entry) {\n \t\tret = -ENOMEM;\n-\t\tgoto err_kzalloc;\n+\t\tgoto err_fdget;\n \t}\n \tentry-\u003esyncobj = syncobj;\n-\tentry-\u003eev_fd_ctx = ev_fd_ctx;\n+\tentry-\u003eev_fd_ctx = no_free_ptr(ev_fd_ctx);\n \tentry-\u003epoint = args-\u003epoint;\n \tentry-\u003eflags = args-\u003eflags;\n \n@@ -1502,8 +1502,6 @@ drm_syncobj_eventfd_ioctl(struct drm_device dev, void data,\n \n \treturn 0;\n \n-err_kzalloc:\n-\teventfd_ctx_put(ev_fd_ctx);\n err_fdget:\n \tdrm_syncobj_put(syncobj);\n \treturn ret;\ndiff --git a/fs/eventfd.c b/fs/eventfd.c\nindex 9d33a02757d52..1cd1741b81b17 100644\n--- a/fs/eventfd.c\n+++ b/fs/eventfd.c\n@@ -102,6 +102,9 @@ static void eventfd_free(struct kref kref)\n /\n void eventfd_ctx_put(struct eventfd_ctx ctx)\n {\n+\tif (IS_ERR_OR_NULL(ctx))\n+\t\treturn;\n+\n \tkref_put(\u0026ctx-\u003ekref, eventfd_free);\n }\n EXPORT_SYMBOL_GPL(eventfd_ctx_put);\ndiff --git a/include/linux/eventfd.h b/include/linux/eventfd.h\nindex e32bee4345fb9..689358c2b0ae7 100644\n--- a/include/linux/eventfd.h\n+++ b/include/linux/eventfd.h\n@@ -10,6 +10,7 @@\n #define _LINUX_EVENTFD_H\n \n #include \u003clinux/wait.h\u003e\n+#include \u003clinux/cleanup.h\u003e\n #include \u003clinux/err.h\u003e\n #include \u003clinux/percpu-defs.h\u003e\n #include \u003clinux/percpu.h\u003e\n@@ -89,5 +90,7 @@ static inline void eventfd_signal(struct eventfd_ctx ctx)\n \teventfd_signal_mask(ctx, 0);\n }\n \n+DEFINE_FREE(eventfd, struct eventfd_ctx , eventfd_ctx_put(_T))\n+\n #endif /* _LINUX_EVENTFD_H */\n \n" }
2/1	2026/09/15 14:23	agent	patch-evaluator	17m Model: core Args: null Results: { "EnableConfigs": [ "DRM", "DRM_VIRTIO_GPU", "EVENTFD" ], "FocusSymbols": [ "drm_syncobj_eventfd_ioctl", "eventfd_ctx_put" ], "Reasoning": "The patch updates eventfd_ctx_put() in fs/eventfd.c to safely handle IS_ERR_OR_NULL pointers and introduces the DEFINE_FREE(eventfd, ...) scoped cleanup helper, which is then used to refactor resource release and error paths in drm_syncobj_eventfd_ioctl(). The modified code is executable and fully reachable from userspace via virtio-gpu in standard QEMU environments (which supports DRIVER_SYNCOBJ_TIMELINE). Fuzzing is warranted to verify that the cleanup attribute handling and new NULL/ERR checks do not introduce reference leaks, double puts, or other regressions under error paths.", "WorthFuzzing": true } Instruction: You are an expert Linux kernel maintainer and security engineer. Your job is to review a provided patch series and evaluate whether it warrants fuzzing with syzkaller. IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in your workspace. Do NOT rely on internal assumptions. You must actively use your code access tools to inspect the actual source code, callers, and surrounding context. ================================================================================ 1. CORE TRIAGE PHILOSOPHY ================================================================================ The goal of patch fuzzing is to discover crashes, regressions, exposed latent bugs, and newly triggered assertions introduced by the patch series. - REACHABILITY IS THE PRIMARY GATE: Fuzzing can only discover bugs in code that can actually execute in standard virtualized environments (GCE or QEMU, utilizing software-emulated devices like USB gadgets, netdev, tun/tap). If the modified code is structurally unreachable (see Section 2), it MUST NOT be fuzzed, regardless of whether it adds assertions or complex logic. - DO NOT BLINDLY TRUST "NO FUNCTIONAL CHANGE" (NFCI) OR "REFACTORING" CLAIMS: Patch authors routinely label changes as "cleanups", "refactorings", or state "No functional change intended". Do NOT take these claims at face value. Code refactorings that rearrange logic, introduce helper functions, or alter state management in core subsystems frequently introduce subtle semantic shifts or uncover latent kernel bugs. If reachable executable code is modified or refactored, it MUST be fuzzed. - NEW OR MODIFIED ASSERTIONS IN REACHABLE CODE MUST BE FUZZED: When a patch introduces or modifies runtime checks or assertions (e.g., WARN_ON, VM_WARN_ON, BUG_ON, lockdep_assert) in reachable code paths, it enforces new or stricter invariants. Even if the author believes the invariant always holds, fuzzing is essential to verify whether an unusual sequence of operations can violate it. ================================================================================ 2. WHEN TO RETURN WorthFuzzing=false (NEGATIVE CRITERIA) ================================================================================ Return WorthFuzzing=false ONLY IF all modified code falls strictly into one or more of these categories: - Non-kernel and non-executable changes: * Modifications to Documentation/, comments, or spelling fixes. * User-space directories, self-tests, samples, or scripts (e.g., tools/, samples/, scripts/, usr/) that do not affect the compiled kernel image (vmlinux) or kernel modules. * Purely decorative logging (e.g., message strings in pr_err, printk, dev_info) or tracepoints that do not alter control flow or data structures. * Build system or Kconfig changes that do not alter compiled C logic. - Structurally unreachable hardware: * Vendor-specific PCIe switches, SmartNICs, or GPU drivers (e.g., mlxsw, pds_core, qed, ionic, amdgpu) requiring physical ASIC/PCIe cards not emulated in standard QEMU. - Unreachable execution paths: * Driver teardown callbacks (.remove, .shutdown, pci_unregister_driver) executed only during physical PCI hot-unplug or manual sysfs driver unbinding. * Code paths exclusive to architectures other than the target architecture. ================================================================================ 3. WHEN TO RETURN WorthFuzzing=true (POSITIVE CRITERIA) ================================================================================ Return WorthFuzzing=true whenever the patch touches reachable executable code, including: - Core Subsystems: * Any logic modifications in memory management (mm/), synchronization/locking (kernel/locking/), BPF, scheduler, core networking, VFS, or syscall handling. - Refactorings and Code Cleanups: * Any restructuring of reachable data structures, helper abstractions, or algorithm flows. - Runtime Assertions and Defensive Checks: * Any introduction or alteration of assertions (WARN_ON, VM_WARN_ON, BUG_ON, etc.) in reachable paths. - Reachable Drivers and Protocols: Drivers accessible via virtual buses (virtio, USB gadget, loopback, netlink, binder, sockets, etc.). ================================================================================ 4. EXTRACTING FocusSymbols (PREVENTING DILUTION) ================================================================================ When WorthFuzzing=true, you must extract specific kernel functions into FocusSymbols to guide the fuzzer: - AVOID UBIQUITOUS LIFECYCLE HOT-PATHS: Do NOT list generic, ubiquitous functions called by almost every program in the corpus (including, but not limited to: general memory allocators and deallocators, page fault and trap handlers, or core synchronization primitives; this is not an exhaustive list). Listing ubiquitous functions causes the fuzzer to classify thousands of unrelated tests as "focused", which severely dilutes fuzzing effort away from the actual changes. - TARGET SPECIFIC FEATURE LOGIC AND ENTRYPOINTS: List functions that specifically implement the logic being added or altered, or direct API entrypoints for the subsystem feature under review. - HANDLING STATIC INLINE FUNCTIONS IN HEADERS (.h): Compiler-inlined static functions (such as static inlines in mm/.h or include/linux/.h) lack distinct symbol addresses in vmlinux and cannot be targeted directly by symbol coverage filters. If the changes are primarily in static inline helpers, identify non-static, feature-specific caller functions in .c files that exercise them (avoiding ubiquitous lifecycle wrappers). ================================================================================ 5. IDENTIFYING EnableConfigs ================================================================================ Identify any specific CONFIG_ options required to properly compile and reach the modified code: - Inspect Kconfig files and #ifdef guards; do not make assumptions. - Check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed. - Strip any 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4"). Prefer calling several tools at the same time to save round-trips. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: Target architecture: amd64 For your convenience, here is the diff of the changes: commit c5df43be3ebc21de489c5599cca83bfbb4cd878c Author: syz-cluster <triage@syzkaller.com> Date: Tue Sep 15 14:23:02 2026 +0000 syz-cluster: applied patch under review diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c index c23a5de27effa..efc4e8af220c8 100644 --- a/drivers/gpu/drm/drm_syncobj.c +++ b/drivers/gpu/drm/drm_syncobj.c @@ -1462,9 +1462,9 @@ int drm_syncobj_eventfd_ioctl(struct drm_device dev, void data, struct drm_file file_private) { + struct eventfd_ctx ev_fd_ctx __free(eventfd) = NULL; struct drm_syncobj_eventfd args = data; struct drm_syncobj syncobj; - struct eventfd_ctx ev_fd_ctx; struct syncobj_eventfd_entry entry; int ret; @@ -1490,10 +1490,10 @@ drm_syncobj_eventfd_ioctl(struct drm_device dev, void data, entry = kzalloc_obj(entry); if (!entry) { ret = -ENOMEM; - goto err_kzalloc; + goto err_fdget; } entry->syncobj = syncobj; - entry->ev_fd_ctx = ev_fd_ctx; + entry->ev_fd_ctx = no_free_ptr(ev_fd_ctx); entry->point = args->point; entry->flags = args->flags; @@ -1502,8 +1502,6 @@ drm_syncobj_eventfd_ioctl(struct drm_device dev, void data, return 0; -err_kzalloc: - eventfd_ctx_put(ev_fd_ctx); err_fdget: drm_syncobj_put(syncobj); return ret; diff --git a/fs/eventfd.c b/fs/eventfd.c index 9d33a02757d52..1cd1741b81b17 100644 --- a/fs/eventfd.c +++ b/fs/eventfd.c @@ -102,6 +102,9 @@ static void eventfd_free(struct kref kref) / void eventfd_ctx_put(struct eventfd_ctx ctx) { + if (IS_ERR_OR_NULL(ctx)) + return; + kref_put(&ctx->kref, eventfd_free); } EXPORT_SYMBOL_GPL(eventfd_ctx_put); diff --git a/include/linux/eventfd.h b/include/linux/eventfd.h index e32bee4345fb9..689358c2b0ae7 100644 --- a/include/linux/eventfd.h +++ b/include/linux/eventfd.h @@ -10,6 +10,7 @@ #define _LINUX_EVENTFD_H #include <linux/wait.h> +#include <linux/cleanup.h> #include <linux/err.h> #include <linux/percpu-defs.h> #include <linux/percpu.h> @@ -89,5 +90,7 @@ static inline void eventfd_signal(struct eventfd_ctx ctx) eventfd_signal_mask(ctx, 0); } +DEFINE_FREE(eventfd, struct eventfd_ctx , eventfd_ctx_put(_T)) + #endif /* _LINUX_EVENTFD_H */
3/2	2026/09/15 14:23	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 3592 output: 41 thoughts: 234 Thoughts: Analyzing this Patch for Eventfd and DRM Syncobjs Okay, let's break this down. My initial instinct is to thoroughly examine this patch, starting with a granular look at the code changes. I need to understand the implications of these modifications, particularly within the context of the DRM syncobj subsystem, given my expertise. First, the patch alters three files. It looks like: 1. In `fs/eventfd.c`, there's a safety check being added to `eventfd_ctx_put`: `if (IS_ERR_OR_NULL(ctx)) return;`. This immediately suggests a possible null pointer dereference protection. Important, but straightforward. 2. `include/linux/eventfd.h` is getting a change to the `DEFINE_FREE` macro for `eventfd`, specifically adding `eventfd_ctx_put(_T)`. This means the macro is now responsible for freeing the `eventfd_ctx`. This is significant because the macro is a crucial part of kernel memory management. 3. Finally, and perhaps the most interesting piece, is the change within `drivers/gpu/drm/drm_syncobj.c`. The `drm_syncobj_eventfd_ioctl` function is the core of this interaction. Here, the patch modifies how `struct eventfd_ctx *ev_fd_ctx` is handled. It seems the code introduces a `__free(eventfd)` attribute and a `no_free_ptr` function call. Additionally, the old `err_kzalloc` label and corresponding `eventfd_ctx_put` call have been removed. This implies a change in how `eventfd_ctx` is managed and released in the context of the DRM syncobj. I need to dig deeper into the control flow and memory management logic to confirm the details. I need to keep in mind, I need to check the exact function `drm_syncobj_eventfd_ioctl` and the surrounding code context, this change to see what's really going on. I'll need to know the rationale for the change and identify potential regression issues.
4/2	2026/09/15 14:23	tool	read-file	0m Args: { "File": "drivers/gpu/drm/drm_syncobj.c", "FirstLine": 1460, "LineCount": 60 } Results: { "Contents": "1460:\t\n1461:\tint\n1462:\tdrm_syncobj_eventfd_ioctl(struct drm_device dev, void data,\n1463:\t\t\t\t struct drm_file file_private)\n1464:\t{\n1465:\t\tstruct eventfd_ctx ev_fd_ctx __free(eventfd) = NULL;\n1466:\t\tstruct drm_syncobj_eventfd args = data;\n1467:\t\tstruct drm_syncobj syncobj;\n1468:\t\tstruct syncobj_eventfd_entry entry;\n1469:\t\tint ret;\n1470:\t\n1471:\t\tif (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))\n1472:\t\t\treturn -EOPNOTSUPP;\n1473:\t\n1474:\t\tif (args-\u003eflags \u0026 ~DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE)\n1475:\t\t\treturn -EINVAL;\n1476:\t\n1477:\t\tif (args-\u003epad)\n1478:\t\t\treturn -EINVAL;\n1479:\t\n1480:\t\tsyncobj = drm_syncobj_find(file_private, args-\u003ehandle);\n1481:\t\tif (!syncobj)\n1482:\t\t\treturn -ENOENT;\n1483:\t\n1484:\t\tev_fd_ctx = eventfd_ctx_fdget(args-\u003efd);\n1485:\t\tif (IS_ERR(ev_fd_ctx)) {\n1486:\t\t\tret = PTR_ERR(ev_fd_ctx);\n1487:\t\t\tgoto err_fdget;\n1488:\t\t}\n1489:\t\n1490:\t\tentry = kzalloc_obj(entry);\n1491:\t\tif (!entry) {\n1492:\t\t\tret = -ENOMEM;\n1493:\t\t\tgoto err_fdget;\n1494:\t\t}\n1495:\t\tentry-\u003esyncobj = syncobj;\n1496:\t\tentry-\u003eev_fd_ctx = no_free_ptr(ev_fd_ctx);\n1497:\t\tentry-\u003epoint = args-\u003epoint;\n1498:\t\tentry-\u003eflags = args-\u003eflags;\n1499:\t\n1500:\t\tdrm_syncobj_add_eventfd(syncobj, entry);\n1501:\t\tdrm_syncobj_put(syncobj);\n1502:\t\n1503:\t\treturn 0;\n1504:\t\n1505:\terr_fdget:\n1506:\t\tdrm_syncobj_put(syncobj);\n1507:\t\treturn ret;\n1508:\t}\n1509:\t\n1510:\tint\n1511:\tdrm_syncobj_reset_ioctl(struct drm_device dev, void data,\n1512:\t\t\t\tstruct drm_file file_private)\n1513:\t{\n1514:\t\tstruct drm_syncobj_array args = data;\n1515:\t\tstruct drm_syncobj **syncobjs;\n1516:\t\tuint32_t i;\n1517:\t\tint ret;\n1518:\t\n1519:\t\tif (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))\n" }
5/2	2026/09/15 14:23	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 5183 output: 33 thoughts: 21 Thoughts: Here's my summary, as if I were thinking these thoughts: Examining `fs/eventfd.c` Okay, I'm digging into this. I need to understand what's happening with eventfd, so let's zoom in on the `fs/eventfd.c` file. I'll focus my attention around line 100. That's usually a good place to start, given my familiarity with the kernel's architecture. Hopefully, the code there will shed some light on the specific behavior I'm curious about.
6/2	2026/09/15 14:23	tool	read-file	0m Args: { "File": "fs/eventfd.c", "FirstLine": 95, "LineCount": 25 } Results: { "Contents": " 95:\t\n 96:\t/*\n 97:\t eventfd_ctx_put - Releases a reference to the internal eventfd context.\n 98:\t * @ctx: [in] Pointer to eventfd context.\n 99:\t \n 100:\t The eventfd context reference must have been previously acquired either\n 101:\t * with eventfd_ctx_fdget() or eventfd_ctx_fileget().\n 102:\t /\n 103:\tvoid eventfd_ctx_put(struct eventfd_ctx ctx)\n 104:\t{\n 105:\t\tif (IS_ERR_OR_NULL(ctx))\n 106:\t\t\treturn;\n 107:\t\n 108:\t\tkref_put(\u0026ctx-\u003ekref, eventfd_free);\n 109:\t}\n 110:\tEXPORT_SYMBOL_GPL(eventfd_ctx_put);\n 111:\t\n 112:\tstatic int eventfd_release(struct inode inode, struct file file)\n 113:\t{\n 114:\t\tstruct eventfd_ctx *ctx = file-\u003eprivate_data;\n 115:\t\n 116:\t\twake_up_poll(\u0026ctx-\u003ewqh, EPOLLHUP);\n 117:\t\teventfd_ctx_put(ctx);\n 118:\t\treturn 0;\n 119:\t}\n" }
7/2	2026/09/15 14:23	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 5728 output: 23 thoughts: 106 Thoughts: Reachability Analysis: DRM Syncobj in QEMU Okay, let's dive into this reachability question. My primary concern is whether `drm_syncobj_eventfd_ioctl` is actually accessible within the QEMU environment. It seems like it should be, considering QEMU supports various DRM devices, specifically things like vgem, virtio-gpu, and vkms. That's a good starting point. Now, my next logical step is to pinpoint the registration. I need to identify which components are responsible for registering either `DRIVER_SYNCOBJ_TIMELINE` or, more directly, `drm_syncobj_eventfd_ioctl` itself. Knowing the registration point will illuminate the execution path. Time to fire up the grepping tools and hunt for those keywords: `drm_syncobj_eventfd_ioctl` and `DRIVER_SYNCOBJ_TIMELINE`. That should lead me to the relevant drivers or modules.
8/2	2026/09/15 14:23	tool	grepper	0m Args: { "Expression": "drm_syncobj_eventfd_ioctl" } Results: { "Output": "drivers/gpu/drm/drm_internal.h=276=int drm_syncobj_timeline_wait_ioctl(struct drm_device dev, void data,\ndrivers/gpu/drm/drm_internal.h-277-\t\t\t\t struct drm_file file_private);\ndrivers/gpu/drm/drm_internal.h:278:int drm_syncobj_eventfd_ioctl(struct drm_device dev, void data,\ndrivers/gpu/drm/drm_internal.h-279-\t\t\t struct drm_file file_private);\n--\ndrivers/gpu/drm/drm_ioctl.c=644=static const struct drm_ioctl_desc drm_ioctls[] = {\n--\ndrivers/gpu/drm/drm_ioctl.c-731-\t\t DRM_RENDER_ALLOW),\ndrivers/gpu/drm/drm_ioctl.c:732:\tDRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_EVENTFD, drm_syncobj_eventfd_ioctl,\ndrivers/gpu/drm/drm_ioctl.c-733-\t\t DRM_RENDER_ALLOW),\n--\ndrivers/gpu/drm/drm_syncobj.c=1461=int\ndrivers/gpu/drm/drm_syncobj.c:1462:drm_syncobj_eventfd_ioctl(struct drm_device dev, void data,\ndrivers/gpu/drm/drm_syncobj.c-1463-\t\t\t struct drm_file *file_private)\n" }
9/2	2026/09/15 14:23	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 6435 output: 22 thoughts: 85 Thoughts: Here's my summary, as if I were thinking it: Digging into DRM Synchronization Objects and EventFD Okay, so I'm looking at `DRM_IOCTL_SYNCOBJ_EVENTFD`. This is an ioctl call that operates on the `/dev/dri/card` or `/dev/dri/renderD` devices. Straightforward enough. The interesting part is that Syzkaller, that fuzzing beast, directly supports `drm_syncobj` and this specific `DRM_IOCTL_SYNCOBJ_EVENTFD` call. That's a good starting point for deeper investigation; Syzkaller's coverage usually highlights areas of potential complexity or vulnerability. Now, I need to understand the scope and implications of this. Let's start by checking `DRIVER_SYNCOBJ_TIMELINE`. I need to figure out which drivers actually use this capability. Identifying which drivers have enabled that specific feature will help me narrow down the potential attack surface and understand the implementation strategies in use. Knowing the drivers involved will allow me to target my analysis more effectively.
10/2	2026/09/15 14:23	tool	grepper	0m Args: { "Expression": "DRIVER_SYNCOBJ_TIMELINE" } Results: { "Output": "drivers/accel/amdxdna/amdxdna_pci_drv.c=329=const struct drm_driver amdxdna_drm_drv = {\ndrivers/accel/amdxdna/amdxdna_pci_drv.c-330-\t.driver_features = DRIVER_GEM \| DRIVER_COMPUTE_ACCEL \|\ndrivers/accel/amdxdna/amdxdna_pci_drv.c:331:\t\tDRIVER_SYNCOBJ \| DRIVER_SYNCOBJ_TIMELINE,\ndrivers/accel/amdxdna/amdxdna_pci_drv.c-332-\t.fops = \u0026amdxdna_fops,\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_drv.c=3110=static const struct drm_driver amdgpu_kms_driver = {\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_drv.c-3114-\t DRIVER_RENDER \| DRIVER_MODESET \| DRIVER_SYNCOBJ \|\ndrivers/gpu/drm/amd/amdgpu/amdgpu_drv.c:3115:\t DRIVER_SYNCOBJ_TIMELINE,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_drv.c-3116-\t.open = amdgpu_driver_open_kms,\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_drv.c=3138=const struct drm_driver amdgpu_partition_driver = {\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_drv.c-3140-\t DRIVER_GEM \| DRIVER_RENDER \| DRIVER_SYNCOBJ \|\ndrivers/gpu/drm/amd/amdgpu/amdgpu_drv.c:3141:\t DRIVER_SYNCOBJ_TIMELINE,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_drv.c-3142-\t.open = amdgpu_driver_open_kms,\n--\ndrivers/gpu/drm/drm_ioctl.c=234=static int drm_getcap(struct drm_device dev, void data, struct drm_file file_priv)\n--\ndrivers/gpu/drm/drm_ioctl.c-252-\tcase DRM_CAP_SYNCOBJ_TIMELINE:\ndrivers/gpu/drm/drm_ioctl.c:253:\t\treq-\u003evalue = drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE);\ndrivers/gpu/drm/drm_ioctl.c-254-\t\treturn 0;\n--\ndrivers/gpu/drm/drm_syncobj.c=984=drm_syncobj_transfer_ioctl(struct drm_device dev, void data,\n--\ndrivers/gpu/drm/drm_syncobj.c-989-\ndrivers/gpu/drm/drm_syncobj.c:990:\tif (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))\ndrivers/gpu/drm/drm_syncobj.c-991-\t\treturn -EOPNOTSUPP;\n--\ndrivers/gpu/drm/drm_syncobj.c=1366=drm_syncobj_timeline_wait_ioctl(struct drm_device dev, void data,\n--\ndrivers/gpu/drm/drm_syncobj.c-1374-\ndrivers/gpu/drm/drm_syncobj.c:1375:\tif (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))\ndrivers/gpu/drm/drm_syncobj.c-1376-\t\treturn -EOPNOTSUPP;\n--\ndrivers/gpu/drm/drm_syncobj.c=1462=drm_syncobj_eventfd_ioctl(struct drm_device dev, void data,\n--\ndrivers/gpu/drm/drm_syncobj.c-1470-\ndrivers/gpu/drm/drm_syncobj.c:1471:\tif (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))\ndrivers/gpu/drm/drm_syncobj.c-1472-\t\treturn -EOPNOTSUPP;\n--\ndrivers/gpu/drm/drm_syncobj.c=1580=drm_syncobj_timeline_signal_ioctl(struct drm_device dev, void data,\n--\ndrivers/gpu/drm/drm_syncobj.c-1589-\ndrivers/gpu/drm/drm_syncobj.c:1590:\tif (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))\ndrivers/gpu/drm/drm_syncobj.c-1591-\t\treturn -EOPNOTSUPP;\n--\ndrivers/gpu/drm/drm_syncobj.c=1652=int drm_syncobj_query_ioctl(struct drm_device dev, void data,\n--\ndrivers/gpu/drm/drm_syncobj.c-1660-\ndrivers/gpu/drm/drm_syncobj.c:1661:\tif (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))\ndrivers/gpu/drm/drm_syncobj.c-1662-\t\treturn -EOPNOTSUPP;\n--\ndrivers/gpu/drm/i915/i915_driver.c=1767=static const struct drm_driver i915_drm_driver = {\n--\ndrivers/gpu/drm/i915/i915_driver.c-1770-\t DRIVER_RENDER \| DRIVER_MODESET \| DRIVER_ATOMIC \| DRIVER_SYNCOBJ \|\ndrivers/gpu/drm/i915/i915_driver.c:1771:\t DRIVER_SYNCOBJ_TIMELINE,\ndrivers/gpu/drm/i915/i915_driver.c-1772-\t.release = i915_driver_release,\n--\ndrivers/gpu/drm/imagination/pvr_drv.c=1381=static struct drm_driver pvr_drm_driver = {\ndrivers/gpu/drm/imagination/pvr_drv.c-1382-\t.driver_features = DRIVER_GEM \| DRIVER_RENDER \|\ndrivers/gpu/drm/imagination/pvr_drv.c:1383:\t\t\t DRIVER_SYNCOBJ \| DRIVER_SYNCOBJ_TIMELINE,\ndrivers/gpu/drm/imagination/pvr_drv.c-1384-\t.open = pvr_drm_driver_open,\n--\ndrivers/gpu/drm/msm/msm_drv.c=827=static const struct file_operations fops = {\n--\ndrivers/gpu/drm/msm/msm_drv.c-836-\t\tDRIVER_SYNCOBJ \| \\\ndrivers/gpu/drm/msm/msm_drv.c:837:\t\tDRIVER_SYNCOBJ_TIMELINE \| \\\ndrivers/gpu/drm/msm/msm_drv.c-838-\t\t0 )\n--\ndrivers/gpu/drm/msm/msm_syncobj.c=10=msm_syncobj_parse_deps(struct drm_device dev,\n--\ndrivers/gpu/drm/msm/msm_syncobj.c-37-\t\tif (syncobj_desc.point \u0026\u0026\ndrivers/gpu/drm/msm/msm_syncobj.c:38:\t\t !drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE)) {\ndrivers/gpu/drm/msm/msm_syncobj.c-39-\t\t\tret = UERR(EOPNOTSUPP, dev, \"syncobj timeline unsupported\");\n--\ndrivers/gpu/drm/msm/msm_syncobj.c=86=msm_syncobj_parse_post_deps(struct drm_device dev,\n--\ndrivers/gpu/drm/msm/msm_syncobj.c-120-\t\t\tif (!drm_core_check_feature(dev,\ndrivers/gpu/drm/msm/msm_syncobj.c:121:\t\t\t DRIVER_SYNCOBJ_TIMELINE)) {\ndrivers/gpu/drm/msm/msm_syncobj.c-122-\t\t\t\tret = UERR(EOPNOTSUPP, dev, \"syncobj timeline unsupported\");\n--\ndrivers/gpu/drm/nouveau/nouveau_drm.c=1401=driver_legacy_kms = {\n--\ndrivers/gpu/drm/nouveau/nouveau_drm.c-1403-\t\t\t \| DRIVER_SYNCOBJ\ndrivers/gpu/drm/nouveau/nouveau_drm.c:1404:\t\t\t \| DRIVER_SYNCOBJ_TIMELINE\ndrivers/gpu/drm/nouveau/nouveau_drm.c-1405-\t\t\t \| DRIVER_MODESET\n--\ndrivers/gpu/drm/nouveau/nouveau_drm.c=1411=driver_atomic_kms = {\n--\ndrivers/gpu/drm/nouveau/nouveau_drm.c-1413-\t\t\t \| DRIVER_SYNCOBJ\ndrivers/gpu/drm/nouveau/nouveau_drm.c:1414:\t\t\t \| DRIVER_SYNCOBJ_TIMELINE\ndrivers/gpu/drm/nouveau/nouveau_drm.c-1415-\t\t\t \| DRIVER_MODESET\n--\ndrivers/gpu/drm/panthor/panthor_drv.c=1793=static const struct drm_driver panthor_drm_driver = {\ndrivers/gpu/drm/panthor/panthor_drv.c-1794-\t.driver_features = DRIVER_RENDER \| DRIVER_GEM \| DRIVER_SYNCOBJ \|\ndrivers/gpu/drm/panthor/panthor_drv.c:1795:\t\t\t DRIVER_SYNCOBJ_TIMELINE,\ndrivers/gpu/drm/panthor/panthor_drv.c-1796-\t.open = panthor_open,\n--\ndrivers/gpu/drm/virtio/virtgpu_drv.c=328=static const struct drm_driver driver = {\n--\ndrivers/gpu/drm/virtio/virtgpu_drv.c-333-\t.driver_features = DRIVER_MODESET \| DRIVER_GEM \| DRIVER_RENDER \| DRIVER_ATOMIC \|\ndrivers/gpu/drm/virtio/virtgpu_drv.c:334:\t\t\t DRIVER_SYNCOBJ \| DRIVER_SYNCOBJ_TIMELINE \| DRIVER_CURSOR_HOTSPOT,\ndrivers/gpu/drm/virtio/virtgpu_drv.c-335-\t.open = virtio_gpu_driver_open,\n--\ndrivers/gpu/drm/xe/xe_device.c=396=static const struct drm_driver regular_driver = {\n--\ndrivers/gpu/drm/xe/xe_device.c-400-\t DRIVER_RENDER \| DRIVER_SYNCOBJ \|\ndrivers/gpu/drm/xe/xe_device.c:401:\t DRIVER_SYNCOBJ_TIMELINE,\ndrivers/gpu/drm/xe/xe_device.c-402-\t.open = xe_file_open,\n--\ninclude/drm/drm_drv.h=58=enum drm_driver_feature {\n--\ninclude/drm/drm_drv.h-96-\t/\ninclude/drm/drm_drv.h:97:\t @DRIVER_SYNCOBJ_TIMELINE:\ninclude/drm/drm_drv.h-98-\t \n--\ninclude/drm/drm_drv.h-101-\t /\ninclude/drm/drm_drv.h:102:\tDRIVER_SYNCOBJ_TIMELINE = BIT(6),\ninclude/drm/drm_drv.h-103-\t/**\n" }
11/2	2026/09/15 14:23	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 9682 output: 20 thoughts: 124 Thoughts: Investigating Eventfd and its Interaction with Virtio-GPU Okay, this is interesting. I've spotted something in the kernel source, specifically `drivers/gpu/drm/virtio/virtgpu_drv.c`, that has the `DRIVER_SYNCOBJ \| DRIVER_SYNCOBJ_TIMELINE` flag set. Right, Virtio-GPU – that's a key virtual device in QEMU, so that’s directly relevant to my area of expertise. And then I see `eventfd_ctx_put` mentioned. Now, `eventfd.c` is core VFS, that's where the heart of the `eventfd` subsystem lives. That's a good place to start digging deeper. I need to understand what's calling `eventfd_ctx_put`. The fact that it's related to Virtio-GPU means it could be really important for understanding its synchronization mechanisms. So, let's find out. Time to fire up the grep and get a list of all call sites for `eventfd_ctx_put`. Gotta trace down the execution path here.
12/2	2026/09/15 14:24	tool	grepper	0m Args: { "Expression": "eventfd_ctx_put" } Results: { "Output": "\nFull output is too long, showing 500 out of 516 lines.\nUse more precise expression if possible.\n\narch/x86/kvm/hyperv.c=2725=void kvm_hv_destroy_vm(struct kvm kvm)\n--\narch/x86/kvm/hyperv.c-2731-\tidr_for_each_entry(\u0026hv-\u003econn_to_evt, eventfd, i)\narch/x86/kvm/hyperv.c:2732:\t\teventfd_ctx_put(eventfd);\narch/x86/kvm/hyperv.c-2733-\tidr_destroy(\u0026hv-\u003econn_to_evt);\n--\narch/x86/kvm/hyperv.c=2736=static int kvm_hv_eventfd_assign(struct kvm kvm, u32 conn_id, int fd)\n--\narch/x86/kvm/hyperv.c-2755-\t\tret = -EEXIST;\narch/x86/kvm/hyperv.c:2756:\teventfd_ctx_put(eventfd);\narch/x86/kvm/hyperv.c-2757-\treturn ret;\n--\narch/x86/kvm/hyperv.c=2760=static int kvm_hv_eventfd_deassign(struct kvm kvm, u32 conn_id)\n--\narch/x86/kvm/hyperv.c-2772-\tsynchronize_srcu(\u0026kvm-\u003esrcu);\narch/x86/kvm/hyperv.c:2773:\teventfd_ctx_put(eventfd);\narch/x86/kvm/hyperv.c-2774-\treturn 0;\n--\narch/x86/kvm/xen.c=2134=static int kvm_xen_eventfd_assign(struct kvm kvm,\n--\narch/x86/kvm/xen.c-2199-\tif (eventfd)\narch/x86/kvm/xen.c:2200:\t\teventfd_ctx_put(eventfd);\narch/x86/kvm/xen.c-2201-out_noeventfd:\n--\narch/x86/kvm/xen.c=2206=static int kvm_xen_eventfd_deassign(struct kvm kvm, u32 port)\n--\narch/x86/kvm/xen.c-2218-\tif (!evtchnfd-\u003edeliver.port.port)\narch/x86/kvm/xen.c:2219:\t\teventfd_ctx_put(evtchnfd-\u003edeliver.eventfd.ctx);\narch/x86/kvm/xen.c-2220-\tkfree(evtchnfd);\n--\narch/x86/kvm/xen.c=2224=static int kvm_xen_eventfd_reset(struct kvm kvm)\n--\narch/x86/kvm/xen.c-2257-\t\tif (!evtchnfd-\u003edeliver.port.port)\narch/x86/kvm/xen.c:2258:\t\t\teventfd_ctx_put(evtchnfd-\u003edeliver.eventfd.ctx);\narch/x86/kvm/xen.c-2259-\t\tkfree(evtchnfd);\n--\narch/x86/kvm/xen.c=2356=void kvm_xen_destroy_vm(struct kvm kvm)\n--\narch/x86/kvm/xen.c-2364-\t\tif (!evtchnfd-\u003edeliver.port.port)\narch/x86/kvm/xen.c:2365:\t\t\teventfd_ctx_put(evtchnfd-\u003edeliver.eventfd.ctx);\narch/x86/kvm/xen.c-2366-\t\tkfree(evtchnfd);\n--\ndrivers/accel/habanalabs/common/device.c=460=static void hpriv_release(struct kref ref)\n--\ndrivers/accel/habanalabs/common/device.c-536-\tif (hpriv-\u003enotifier_event.eventfd)\ndrivers/accel/habanalabs/common/device.c:537:\t\teventfd_ctx_put(hpriv-\u003enotifier_event.eventfd);\ndrivers/accel/habanalabs/common/device.c-538-\n--\ndrivers/accel/habanalabs/common/habanalabs_ioctl.c=793=static int eventfd_unregister(struct hl_fpriv hpriv, struct hl_info_args args)\n--\ndrivers/accel/habanalabs/common/habanalabs_ioctl.c-800-\ndrivers/accel/habanalabs/common/habanalabs_ioctl.c:801:\teventfd_ctx_put(hpriv-\u003enotifier_event.eventfd);\ndrivers/accel/habanalabs/common/habanalabs_ioctl.c-802-\thpriv-\u003enotifier_event.eventfd = NULL;\n--\ndrivers/fpga/dfl.c=1869=static int do_set_irq_trigger(struct dfl_feature feature, unsigned int idx,\n--\ndrivers/fpga/dfl.c-1880-\t\tkfree(feature-\u003eirq_ctx[idx].name);\ndrivers/fpga/dfl.c:1881:\t\teventfd_ctx_put(feature-\u003eirq_ctx[idx].trigger);\ndrivers/fpga/dfl.c-1882-\t\tfeature-\u003eirq_ctx[idx].trigger = NULL;\n--\ndrivers/fpga/dfl.c-1906-\ndrivers/fpga/dfl.c:1907:\teventfd_ctx_put(trigger);\ndrivers/fpga/dfl.c-1908-free_name:\n--\ndrivers/gpu/drm/drm_syncobj.c=303=syncobj_eventfd_entry_free(struct syncobj_eventfd_entry entry)\ndrivers/gpu/drm/drm_syncobj.c-304-{\ndrivers/gpu/drm/drm_syncobj.c:305:\teventfd_ctx_put(entry-\u003eev_fd_ctx);\ndrivers/gpu/drm/drm_syncobj.c-306-\tdma_fence_put(entry-\u003efence);\n--\ndrivers/gpu/drm/i915/gvt/kvmgt.c=690=static void intel_vgpu_release_msi_eventfd_ctx(struct intel_vgpu vgpu)\n--\ndrivers/gpu/drm/i915/gvt/kvmgt.c-695-\tif (trigger) {\ndrivers/gpu/drm/i915/gvt/kvmgt.c:696:\t\teventfd_ctx_put(trigger);\ndrivers/gpu/drm/i915/gvt/kvmgt.c-697-\t\tvgpu-\u003emsi_trigger = NULL;\n--\ndrivers/hv/mshv_eventfd.c=254=static void mshv_irqfd_shutdown(struct work_struct work)\n--\ndrivers/hv/mshv_eventfd.c-267-\t\tmshv_irqfd_resampler_shutdown(irqfd);\ndrivers/hv/mshv_eventfd.c:268:\t\teventfd_ctx_put(irqfd-\u003eirqfd_resamplefd);\ndrivers/hv/mshv_eventfd.c-269-\t}\n--\ndrivers/hv/mshv_eventfd.c-273-\t /\ndrivers/hv/mshv_eventfd.c:274:\teventfd_ctx_put(irqfd-\u003eirqfd_eventfd_ctx);\ndrivers/hv/mshv_eventfd.c-275-\tkfree(irqfd);\n--\ndrivers/hv/mshv_eventfd.c=393=static int mshv_irqfd_assign(struct mshv_partition pt,\n--\ndrivers/hv/mshv_eventfd.c-529-\tif (resamplefd \u0026\u0026 !IS_ERR(resamplefd))\ndrivers/hv/mshv_eventfd.c:530:\t\teventfd_ctx_put(resamplefd);\ndrivers/hv/mshv_eventfd.c-531-\ndrivers/hv/mshv_eventfd.c-532-\tif (eventfd \u0026\u0026 !IS_ERR(eventfd))\ndrivers/hv/mshv_eventfd.c:533:\t\teventfd_ctx_put(eventfd);\ndrivers/hv/mshv_eventfd.c-534-\n--\ndrivers/hv/mshv_eventfd.c=543=static int mshv_irqfd_deassign(struct mshv_partition pt,\n--\ndrivers/hv/mshv_eventfd.c-562-\ndrivers/hv/mshv_eventfd.c:563:\teventfd_ctx_put(eventfd);\ndrivers/hv/mshv_eventfd.c-564-\n--\ndrivers/hv/mshv_eventfd.c=633=static void ioeventfd_release(struct mshv_ioeventfd p, u64 partition_id)\n--\ndrivers/hv/mshv_eventfd.c-636-\t\tmshv_unregister_doorbell(partition_id, p-\u003eiovntfd_doorbell_id);\ndrivers/hv/mshv_eventfd.c:637:\teventfd_ctx_put(p-\u003eiovntfd_eventfd);\ndrivers/hv/mshv_eventfd.c-638-\tkfree(p);\n--\ndrivers/hv/mshv_eventfd.c=673=static int mshv_assign_ioeventfd(struct mshv_partition pt,\n--\ndrivers/hv/mshv_eventfd.c-767-fail:\ndrivers/hv/mshv_eventfd.c:768:\teventfd_ctx_put(eventfd);\ndrivers/hv/mshv_eventfd.c-769-\n--\ndrivers/hv/mshv_eventfd.c=773=static int mshv_deassign_ioeventfd(struct mshv_partition pt,\n--\ndrivers/hv/mshv_eventfd.c-814-\ndrivers/hv/mshv_eventfd.c:815:\teventfd_ctx_put(eventfd);\ndrivers/hv/mshv_eventfd.c-816-\n--\ndrivers/hv/mshv_vtl_main.c=973=static int mshv_vtl_sint_ioctl_set_eventfd(struct mshv_vtl_set_eventfd __user arg)\n--\ndrivers/hv/mshv_vtl_main.c-995-\t\tsynchronize_rcu();\ndrivers/hv/mshv_vtl_main.c:996:\t\teventfd_ctx_put(old_eventfd);\ndrivers/hv/mshv_vtl_main.c-997-\t}\n--\ndrivers/infiniband/hw/mlx5/devx.c=2072=static int UVERBS_HANDLER(MLX5_IB_METHOD_DEVX_SUBSCRIBE_EVENT)(\n--\ndrivers/infiniband/hw/mlx5/devx.c-2249-\t\tif (event_sub-\u003eeventfd)\ndrivers/infiniband/hw/mlx5/devx.c:2250:\t\t\teventfd_ctx_put(event_sub-\u003eeventfd);\ndrivers/infiniband/hw/mlx5/devx.c-2251-\t\tuverbs_uobject_put(\u0026event_sub-\u003eev_file-\u003euobj);\n--\ndrivers/infiniband/hw/mlx5/devx.c=2940=static void devx_free_subscription(struct rcu_head rcu)\n--\ndrivers/infiniband/hw/mlx5/devx.c-2945-\tif (event_sub-\u003eeventfd)\ndrivers/infiniband/hw/mlx5/devx.c:2946:\t\teventfd_ctx_put(event_sub-\u003eeventfd);\ndrivers/infiniband/hw/mlx5/devx.c-2947-\tuverbs_uobject_put(\u0026event_sub-\u003eev_file-\u003euobj);\n--\ndrivers/misc/ocxl/file.c=191=static void irq_free(void private)\n--\ndrivers/misc/ocxl/file.c-194-\ndrivers/misc/ocxl/file.c:195:\teventfd_ctx_put(ev_ctx);\ndrivers/misc/ocxl/file.c-196-}\n--\ndrivers/misc/ocxl/file.c=198=static long afu_ioctl(struct file file, unsigned int cmd,\n--\ndrivers/misc/ocxl/file.c-259-\t\tif (rc)\ndrivers/misc/ocxl/file.c:260:\t\t\teventfd_ctx_put(ev_ctx);\ndrivers/misc/ocxl/file.c-261-\t\tbreak;\n--\ndrivers/s390/cio/vfio_ccw_ops.c=410=static int vfio_ccw_mdev_set_irqs(struct vfio_ccw_private private,\n--\ndrivers/s390/cio/vfio_ccw_ops.c-460-\t\t\tif (ctx)\ndrivers/s390/cio/vfio_ccw_ops.c:461:\t\t\t\teventfd_ctx_put(ctx);\ndrivers/s390/cio/vfio_ccw_ops.c-462-\t\t\tctx = NULL;\n--\ndrivers/s390/cio/vfio_ccw_ops.c-470-\t\t\tif (ctx)\ndrivers/s390/cio/vfio_ccw_ops.c:471:\t\t\t\teventfd_ctx_put(ctx);\ndrivers/s390/cio/vfio_ccw_ops.c-472-\n--\ndrivers/s390/crypto/vfio_ap_ops.c=2172=static int vfio_ap_set_request_irq(struct ap_matrix_mdev matrix_mdev,\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2187-\t\tif (matrix_mdev-\u003ereq_trigger)\ndrivers/s390/crypto/vfio_ap_ops.c:2188:\t\t\teventfd_ctx_put(matrix_mdev-\u003ereq_trigger);\ndrivers/s390/crypto/vfio_ap_ops.c-2189-\t\tmatrix_mdev-\u003ereq_trigger = NULL;\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2195-\t\tif (matrix_mdev-\u003ereq_trigger)\ndrivers/s390/crypto/vfio_ap_ops.c:2196:\t\t\teventfd_ctx_put(matrix_mdev-\u003ereq_trigger);\ndrivers/s390/crypto/vfio_ap_ops.c-2197-\n--\ndrivers/s390/crypto/vfio_ap_ops.c=2206=static int vfio_ap_set_cfg_change_irq(struct ap_matrix_mdev matrix_mdev, unsigned long arg)\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2220-\t\tif (matrix_mdev-\u003ecfg_chg_trigger)\ndrivers/s390/crypto/vfio_ap_ops.c:2221:\t\t\teventfd_ctx_put(matrix_mdev-\u003ecfg_chg_trigger);\ndrivers/s390/crypto/vfio_ap_ops.c-2222-\t\tmatrix_mdev-\u003ecfg_chg_trigger = NULL;\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2228-\t\tif (matrix_mdev-\u003ecfg_chg_trigger)\ndrivers/s390/crypto/vfio_ap_ops.c:2229:\t\t\teventfd_ctx_put(matrix_mdev-\u003ecfg_chg_trigger);\ndrivers/s390/crypto/vfio_ap_ops.c-2230-\n--\ndrivers/usb/gadget/function/f_fs.c=2289=static void ffs_data_clear(struct ffs_data ffs)\n--\ndrivers/usb/gadget/function/f_fs.c-2313-\tif (ffs-\u003effs_eventfd) {\ndrivers/usb/gadget/function/f_fs.c:2314:\t\teventfd_ctx_put(ffs-\u003effs_eventfd);\ndrivers/usb/gadget/function/f_fs.c-2315-\t\tffs-\u003effs_eventfd = NULL;\n--\ndrivers/vdpa/vdpa_user/vduse_dev.c=496=static void vduse_dev_reset(struct vduse_dev dev)\n--\ndrivers/vdpa/vdpa_user/vduse_dev.c-532-\t\t\tif (vq-\u003ekickfd)\ndrivers/vdpa/vdpa_user/vduse_dev.c:533:\t\t\t\teventfd_ctx_put(vq-\u003ekickfd);\ndrivers/vdpa/vdpa_user/vduse_dev.c-534-\t\t\tvq-\u003ekickfd = NULL;\n--\ndrivers/vdpa/vdpa_user/vduse_dev.c=1199=static int vduse_kickfd_setup(struct vduse_dev dev,\n--\ndrivers/vdpa/vdpa_user/vduse_dev.c-1219-\tif (vq-\u003ekickfd)\ndrivers/vdpa/vdpa_user/vduse_dev.c:1220:\t\teventfd_ctx_put(vq-\u003ekickfd);\ndrivers/vdpa/vdpa_user/vduse_dev.c-1221-\tvq-\u003ekickfd = ctx;\n--\ndrivers/vfio/cdx/intr.c=58=static int vfio_cdx_msi_set_vector_signal(struct vfio_cdx_device vdev,\n--\ndrivers/vfio/cdx/intr.c-71-\t\tkfree(vdev-\u003ecdx_irqs[vector].name);\ndrivers/vfio/cdx/intr.c:72:\t\teventfd_ctx_put(vdev-\u003ecdx_irqs[vector].trigger);\ndrivers/vfio/cdx/intr.c-73-\t\tvdev-\u003ecdx_irqs[vector].trigger = NULL;\n--\ndrivers/vfio/cdx/intr.c-93-\t\tkfree(vdev-\u003ecdx_irqs[vector].name);\ndrivers/vfio/cdx/intr.c:94:\t\teventfd_ctx_put(trigger);\ndrivers/vfio/cdx/intr.c-95-\t\treturn ret;\n--\ndrivers/vfio/fsl-mc/vfio_fsl_mc_intr.c=61=static int vfio_set_trigger(struct vfio_fsl_mc_device vdev,\n--\ndrivers/vfio/fsl-mc/vfio_fsl_mc_intr.c-72-\t\tkfree(irq-\u003ename);\ndrivers/vfio/fsl-mc/vfio_fsl_mc_intr.c:73:\t\teventfd_ctx_put(irq-\u003etrigger);\ndrivers/vfio/fsl-mc/vfio_fsl_mc_intr.c-74-\t\tirq-\u003etrigger = NULL;\n--\ndrivers/vfio/fsl-mc/vfio_fsl_mc_intr.c-96-\t\tkfree(irq-\u003ename);\ndrivers/vfio/fsl-mc/vfio_fsl_mc_intr.c:97:\t\teventfd_ctx_put(trigger);\ndrivers/vfio/fsl-mc/vfio_fsl_mc_intr.c-98-\t\tirq-\u003etrigger = NULL;\n--\ndrivers/vfio/pci/vfio_pci_core.c=44=static void vfio_pci_eventfd_rcu_free(struct rcu_head rcu)\n--\ndrivers/vfio/pci/vfio_pci_core.c-48-\ndrivers/vfio/pci/vfio_pci_core.c:49:\teventfd_ctx_put(eventfd-\u003ectx);\ndrivers/vfio/pci/vfio_pci_core.c-50-\tkfree(eventfd);\n--\ndrivers/vfio/pci/vfio_pci_core.c=413=static int vfio_pci_core_pm_entry_with_wakeup(\n--\ndrivers/vfio/pci/vfio_pci_core.c-438-\tif (ret)\ndrivers/vfio/pci/vfio_pci_core.c:439:\t\teventfd_ctx_put(efdctx);\ndrivers/vfio/pci/vfio_pci_core.c-440-\n--\ndrivers/vfio/pci/vfio_pci_core.c=444=static void __vfio_pci_runtime_pm_exit(struct vfio_pci_core_device vdev)\n--\ndrivers/vfio/pci/vfio_pci_core.c-450-\t\tif (vdev-\u003epm_wake_eventfd_ctx) {\ndrivers/vfio/pci/vfio_pci_core.c:451:\t\t\teventfd_ctx_put(vdev-\u003epm_wake_eventfd_ctx);\ndrivers/vfio/pci/vfio_pci_core.c-452-\t\t\tvdev-\u003epm_wake_eventfd_ctx = NULL;\n--\ndrivers/vfio/pci/vfio_pci_intrs.c=324=static int vfio_intx_set_signal(struct vfio_pci_core_device vdev,\n--\ndrivers/vfio/pci/vfio_pci_intrs.c-342-\t\tvfio_virqfd_flush_thread(\u0026ctx-\u003eunmask);\ndrivers/vfio/pci/vfio_pci_intrs.c:343:\t\teventfd_ctx_put(old);\ndrivers/vfio/pci/vfio_pci_intrs.c-344-\t}\n--\ndrivers/vfio/pci/vfio_pci_intrs.c=349=static void vfio_intx_disable(struct vfio_pci_core_device vdev)\n--\ndrivers/vfio/pci/vfio_pci_intrs.c-362-\t\tif (ctx-\u003etrigger)\ndrivers/vfio/pci/vfio_pci_intrs.c:363:\t\t\teventfd_ctx_put(ctx-\u003etrigger);\ndrivers/vfio/pci/vfio_pci_intrs.c-364-\t\tkfree(ctx-\u003ename);\n--\ndrivers/vfio/pci/vfio_pci_intrs.c=447=static int vfio_msi_set_vector_signal(struct vfio_pci_core_device vdev,\n--\ndrivers/vfio/pci/vfio_pci_intrs.c-465-\t\tkfree(ctx-\u003ename);\ndrivers/vfio/pci/vfio_pci_intrs.c:466:\t\teventfd_ctx_put(ctx-\u003etrigger);\ndrivers/vfio/pci/vfio_pci_intrs.c-467-\t\tvfio_irq_ctx_free(vdev, ctx, vector);\n--\ndrivers/vfio/pci/vfio_pci_intrs.c-525-out_put_eventfd_ctx:\ndrivers/vfio/pci/vfio_pci_intrs.c:526:\teventfd_ctx_put(trigger);\ndrivers/vfio/pci/vfio_pci_intrs.c-527-out_free_name:\n--\ndrivers/vfio/pci/vfio_pci_intrs.c=634=static int vfio_pci_set_intx_trigger(struct vfio_pci_core_device vdev,\n--\ndrivers/vfio/pci/vfio_pci_intrs.c-662-\t\tif (ret \u0026\u0026 trigger)\ndrivers/vfio/pci/vfio_pci_intrs.c:663:\t\t\teventfd_ctx_put(trigger);\ndrivers/vfio/pci/vfio_pci_intrs.c-664-\n--\ndrivers/vfio/pci/vfio_pci_intrs.c=734=static int vfio_pci_set_ctx_trigger_single(struct vfio_pci_core_device vdev,\n--\ndrivers/vfio/pci/vfio_pci_intrs.c-793-\t\t\tif (ret)\ndrivers/vfio/pci/vfio_pci_intrs.c:794:\t\t\t\teventfd_ctx_put(efdctx);\ndrivers/vfio/pci/vfio_pci_intrs.c-795-\n--\ndrivers/vfio/platform/vfio_platform_irq.c=182=static int vfio_set_trigger(struct vfio_platform_device vdev, int index,\n--\ndrivers/vfio/platform/vfio_platform_irq.c-189-\t\tdisable_irq(irq-\u003ehwirq);\ndrivers/vfio/platform/vfio_platform_irq.c:190:\t\teventfd_ctx_put(irq-\u003etrigger);\ndrivers/vfio/platform/vfio_platform_irq.c-191-\t\tirq-\u003etrigger = NULL;\n--\ndrivers/vfio/platform/vfio_platform_irq.c=351=void vfio_platform_irq_cleanup(struct vfio_platform_device vdev)\n--\ndrivers/vfio/platform/vfio_platform_irq.c-360-\t\t\tif (vdev-\u003eirqs[i].trigger)\ndrivers/vfio/platform/vfio_platform_irq.c:361:\t\t\t\teventfd_ctx_put(vdev-\u003eirqs[i].trigger);\ndrivers/vfio/platform/vfio_platform_irq.c-362-\t\t\tkfree(vdev-\u003eirqs[i].name);\n--\ndrivers/vfio/virqfd.c=85=static void virqfd_shutdown(struct work_struct work)\n--\ndrivers/vfio/virqfd.c-91-\tflush_work(\u0026virqfd-\u003einject);\ndrivers/vfio/virqfd.c:92:\teventfd_ctx_put(virqfd-\u003eeventfd);\ndrivers/vfio/virqfd.c-93-\n--\ndrivers/vfio/virqfd.c=111=int vfio_virqfd_enable(void opaque,\n--\ndrivers/vfio/virqfd.c-184-err_busy:\ndrivers/vfio/virqfd.c:185:\teventfd_ctx_put(ctx);\ndrivers/vfio/virqfd.c-186-err_fd:\n--\ndrivers/vhost/vdpa.c=519=static void vhost_vdpa_config_put(struct vhost_vdpa v)\n--\ndrivers/vhost/vdpa.c-521-\tif (v-\u003econfig_ctx) {\ndrivers/vhost/vdpa.c:522:\t\teventfd_ctx_put(v-\u003econfig_ctx);\ndrivers/vhost/vdpa.c-523-\t\tv-\u003econfig_ctx = NULL;\n--\ndrivers/vhost/vdpa.c=527=static long vhost_vdpa_set_config_call(struct vhost_vdpa v, u32 __user argp)\n--\ndrivers/vhost/vdpa.c-541-\tif (!IS_ERR_OR_NULL(ctx))\ndrivers/vhost/vdpa.c:542:\t\teventfd_ctx_put(ctx);\ndrivers/vhost/vdpa.c-543-\n--\ndrivers/vhost/vhost.c=1203=void vhost_dev_cleanup(struct vhost_dev dev)\n--\ndrivers/vhost/vhost.c-1208-\t\tif (dev-\u003evqs[i]-\u003eerror_ctx)\ndrivers/vhost/vhost.c:1209:\t\t\teventfd_ctx_put(dev-\u003evqs[i]-\u003eerror_ctx);\ndrivers/vhost/vhost.c-1210-\t\tif (dev-\u003evqs[i]-\u003ekick)\n--\ndrivers/vhost/vhost.c-1212-\t\tif (dev-\u003evqs[i]-\u003ecall_ctx.ctx)\ndrivers/vhost/vhost.c:1213:\t\t\teventfd_ctx_put(dev-\u003evqs[i]-\u003ecall_ctx.ctx);\ndrivers/vhost/vhost.c-1214-\t\tvhost_vq_reset(dev, dev-\u003evqs[i]);\n--\ndrivers/vhost/vhost.c-1217-\tif (dev-\u003elog_ctx)\ndrivers/vhost/vhost.c:1218:\t\teventfd_ctx_put(dev-\u003elog_ctx);\ndrivers/vhost/vhost.c-1219-\tdev-\u003elog_ctx = NULL;\n--\ndrivers/vhost/vhost.c=2150=long vhost_vring_ioctl(struct vhost_dev d, unsigned int ioctl, void __user argp)\n--\ndrivers/vhost/vhost.c-2274-\tif (!IS_ERR_OR_NULL(ctx))\ndrivers/vhost/vhost.c:2275:\t\teventfd_ctx_put(ctx);\ndrivers/vhost/vhost.c-2276-\tif (filep)\n--\ndrivers/vhost/vhost.c=2321=long vhost_dev_ioctl(struct vhost_dev d, unsigned int ioctl, void __user argp)\n--\ndrivers/vhost/vhost.c-2419-\t\tif (ctx)\ndrivers/vhost/vhost.c:2420:\t\t\teventfd_ctx_put(ctx);\ndrivers/vhost/vhost.c-2421-\t\tbreak;\n--\ndrivers/virt/acrn/ioeventfd.c=43=static void acrn_ioeventfd_shutdown(struct acrn_vm vm, struct hsm_ioeventfd p)\n--\ndrivers/virt/acrn/ioeventfd.c-46-\ndrivers/virt/acrn/ioeventfd.c:47:\teventfd_ctx_put(p-\u003eeventfd);\ndrivers/virt/acrn/ioeventfd.c-48-\tlist_del(\u0026p-\u003elist);\n--\ndrivers/virt/acrn/ioeventfd.c=76=static int acrn_ioeventfd_assign(struct acrn_vm vm,\n--\ndrivers/virt/acrn/ioeventfd.c-142-fail:\ndrivers/virt/acrn/ioeventfd.c:143:\teventfd_ctx_put(eventfd);\ndrivers/virt/acrn/ioeventfd.c-144-\treturn ret;\n--\ndrivers/virt/acrn/ioeventfd.c=147=static int acrn_ioeventfd_deassign(struct acrn_vm vm,\n--\ndrivers/virt/acrn/ioeventfd.c-168-\ndrivers/virt/acrn/ioeventfd.c:169:\teventfd_ctx_put(eventfd);\ndrivers/virt/acrn/ioeventfd.c-170-\treturn 0;\n--\ndrivers/virt/acrn/irqfd.c=60=static void hsm_irqfd_shutdown_work(struct work_struct work)\n--\ndrivers/virt/acrn/irqfd.c-72-\teventfd_ctx_remove_wait_queue(irqfd-\u003eeventfd, \u0026irqfd-\u003ewait, \u0026cnt);\ndrivers/virt/acrn/irqfd.c:73:\teventfd_ctx_put(irqfd-\u003eeventfd);\ndrivers/virt/acrn/irqfd.c-74-\tkfree(irqfd);\n--\ndrivers/virt/acrn/irqfd.c=111=static int acrn_irqfd_assign(struct acrn_vm vm, struct acrn_irqfd args)\n--\ndrivers/virt/acrn/irqfd.c-170-fail:\ndrivers/virt/acrn/irqfd.c:171:\teventfd_ctx_put(eventfd);\ndrivers/virt/acrn/irqfd.c-172-out:\n--\ndrivers/virt/acrn/irqfd.c=177=static int acrn_irqfd_deassign(struct acrn_vm vm,\n--\ndrivers/virt/acrn/irqfd.c-195-\tmutex_unlock(\u0026vm-\u003eirqfds_lock);\ndrivers/virt/acrn/irqfd.c:196:\teventfd_ctx_put(eventfd);\ndrivers/virt/acrn/irqfd.c-197-\n--\ndrivers/xen/privcmd.c=912=static void irqfd_shutdown(struct work_struct work)\n--\ndrivers/xen/privcmd.c-921-\teventfd_ctx_remove_wait_queue(kirqfd-\u003eeventfd, \u0026kirqfd-\u003ewait, \u0026cnt);\ndrivers/xen/privcmd.c:922:\teventfd_ctx_put(kirqfd-\u003eeventfd);\ndrivers/xen/privcmd.c-923-\tkfree(kirqfd);\n--\ndrivers/xen/privcmd.c=976=static int privcmd_irqfd_assign(struct privcmd_irqfd irqfd)\n--\ndrivers/xen/privcmd.c-1044-error_eventfd:\ndrivers/xen/privcmd.c:1045:\teventfd_ctx_put(kirqfd-\u003eeventfd);\ndrivers/xen/privcmd.c-1046-\n--\ndrivers/xen/privcmd.c=1052=static int privcmd_irqfd_deassign(struct privcmd_irqfd irqfd)\n--\ndrivers/xen/privcmd.c-1072-\ndrivers/xen/privcmd.c:1073:\teventfd_ctx_put(eventfd);\ndrivers/xen/privcmd.c-1074-\n--\ndrivers/xen/privcmd.c=1346=static void ioeventfd_free(struct privcmd_kernel_ioeventfd kioeventfd)\n--\ndrivers/xen/privcmd.c-1348-\tlist_del(\u0026kioeventfd-\u003elist);\ndrivers/xen/privcmd.c:1349:\teventfd_ctx_put(kioeventfd-\u003eeventfd);\ndrivers/xen/privcmd.c-1350-\tkfree(kioeventfd);\n--\ndrivers/xen/privcmd.c=1353=static int privcmd_ioeventfd_assign(struct privcmd_ioeventfd ioeventfd)\n--\ndrivers/xen/privcmd.c-1403-error_eventfd:\ndrivers/xen/privcmd.c:1404:\teventfd_ctx_put(kioeventfd-\u003eeventfd);\ndrivers/xen/privcmd.c-1405-\n--\ndrivers/xen/privcmd.c=1411=static int privcmd_ioeventfd_deassign(struct privcmd_ioeventfd ioeventfd)\n--\ndrivers/xen/privcmd.c-1454-\tmutex_unlock(\u0026ioreq_lock);\ndrivers/xen/privcmd.c:1455:\teventfd_ctx_put(eventfd);\ndrivers/xen/privcmd.c-1456-\n--\nfs/aio.c=1156=static inline void iocb_destroy(struct aio_kiocb iocb)\n--\nfs/aio.c-1158-\tif (iocb-\u003eki_eventfd)\nfs/aio.c:1159:\t\teventfd_ctx_put(iocb-\u003eki_eventfd);\nfs/aio.c-1160-\tif (iocb-\u003eki_filp)\n--\nfs/eventfd.c=89=static void eventfd_free(struct kref kref)\n--\nfs/eventfd.c-96-/*\nfs/eventfd.c:97: eventfd_ctx_put - Releases a reference to the internal eventfd context.\nfs/eventfd.c-98- * @ctx: [in] Pointer to eventfd context.\n--\nfs/eventfd.c-102- /\nfs/eventfd.c:103:void eventfd_ctx_put(struct eventfd_ctx ctx)\nfs/eventfd.c-104-{\n--\nfs/eventfd.c-109-}\nfs/eventfd.c:110:EXPORT_SYMBOL_GPL(eventfd_ctx_put);\nfs/eventfd.c-111-\nfs/eventfd.c=112=static int eventfd_release(struct inode inode, struct file file)\n--\nfs/eventfd.c-116-\twake_up_poll(\u0026ctx-\u003ewqh, EPOLLHUP);\nfs/eventfd.c:117:\teventfd_ctx_put(ctx);\nfs/eventfd.c-118-\treturn 0;\n--\ninclude/linux/eventfd.h=31=struct file;\n--\ninclude/linux/eventfd.h-34-\ninclude/linux/eventfd.h:35:void eventfd_ctx_put(struct eventfd_ctx ctx);\ninclude/linux/eventfd.h-36-struct file eventfd_fget(int fd);\n--\ninclude/linux/eventfd.h=61=static inline void eventfd_signal_mask(struct eventfd_ctx ctx, __poll_t mask)\n--\ninclude/linux/eventfd.h-64-\ninclude/linux/eventfd.h:65:static inline void eventfd_ctx_put(struct eventfd_ctx ctx)\ninclude/linux/eventfd.h-66-{\n--\ninclude/linux/eventfd.h=88=static inline void eventfd_signal(struct eventfd_ctx ctx)\n--\ninclude/linux/eventfd.h-92-\ninclude/linux/eventfd.h:93:DEFINE_FREE(eventfd, struct eventfd_ctx , eventfd_ctx_put(_T))\ninclude/linux/eventfd.h-94-\n--\nio_uring/eventfd.c=28=static void io_eventfd_free(struct rcu_head rcu)\n--\nio_uring/eventfd.c-31-\nio_uring/eventfd.c:32:\teventfd_ctx_put(ev_fd-\u003ecq_ev_fd);\nio_uring/eventfd.c-33-\tkfree(ev_fd);\n--\nmm/memcontrol-v1.c=1020=static void memcg_event_remove(struct work_struct work)\n--\nmm/memcontrol-v1.c-1032-\nmm/memcontrol-v1.c:1033:\teventfd_ctx_put(event-\u003eeventfd);\nmm/memcontrol-v1.c-1034-\tkfree(event);\n--\nmm/memcontrol-v1.c=1094=static ssize_t memcg_write_event_control(struct kernfs_open_file of,\n--\nmm/memcontrol-v1.c-1227-out_put_eventfd:\nmm/memcontrol-v1.c:1228:\teventfd_ctx_put(event-\u003eeventfd);\nmm/memcontrol-v1.c-1229-out_kfree:\n--\nsamples/vfio-mdev/mtty.c=1534=static void mtty_disable_intx(struct mdev_state mdev_state)\n--\nsamples/vfio-mdev/mtty.c-1536-\tif (mdev_state-\u003eintx_evtfd) {\nsamples/vfio-mdev/mtty.c:1537:\t\teventfd_ctx_put(mdev_state-\u003eintx_evtfd);\nsamples/vfio-mdev/mtty.c-1538-\t\tmdev_state-\u003eintx_evtfd = NULL;\n--\nsamples/vfio-mdev/mtty.c=1544=static void mtty_disable_msi(struct mdev_state mdev_state)\n--\nsamples/vfio-mdev/mtty.c-1546-\tif (mdev_state-\u003emsi_evtfd) {\nsamples/vfio-mdev/mtty.c:1547:\t\teventfd_ctx_put(mdev_state-\u003emsi_evtfd);\nsamples/vfio-mdev/mtty.c-1548-\t\tmdev_state-\u003emsi_evtfd = NULL;\n--\nvirt/kvm/eventfd.c=123=irqfd_shutdown(struct work_struct work)\n--\nvirt/kvm/eventfd.c-146-\t\tirqfd_resampler_shutdown(irqfd);\nvirt/kvm/eventfd.c:147:\t\teventfd_ctx_put(irqfd-\u003eresamplefd);\nvirt/kvm/eventfd.c-148-\t}\n--\nvirt/kvm/eventfd.c-155-#endif\nvirt/kvm/eventfd.c:156:\teventfd_ctx_put(irqfd-\u003eeventfd);\nvirt/kvm/eventfd.c-157-\tkfree(irqfd);\n--\nvirt/kvm/eventfd.c=371=kvm_irqfd_assign(struct kvm kvm, struct kvm_irqfd args)\n--\nvirt/kvm/eventfd.c-512-\tif (resamplefd \u0026\u0026 !IS_ERR(resamplefd))\nvirt/kvm/eventfd.c:513:\t\teventfd_ctx_put(resamplefd);\nvirt/kvm/eventfd.c-514-\nvirt/kvm/eventfd.c-515-\tif (eventfd \u0026\u0026 !IS_ERR(eventfd))\nvirt/kvm/eventfd.c:516:\t\teventfd_ctx_put(eventfd);\nvirt/kvm/eventfd.c-517-\n--\nvirt/kvm/eventfd.c=590=kvm_irqfd_deassign(struct kvm kvm, struct kvm_irqfd args)\n--\nvirt/kvm/eventfd.c-606-\tspin_unlock_irq(\u0026kvm-\u003eirqfds.lock);\nvirt/kvm/eventfd.c:607:\teventfd_ctx_put(eventfd);\nvirt/kvm/eventfd.c-608-\n--\n\n" }
13/2	2026/09/15 14:24	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 20953 output: 35 thoughts: 219 Thoughts: My Initial Thoughts on the Patch Okay, so `eventfd_ctx_put` is all over the kernel, huh? KVM, AIO, io_uring, DRM syncobjs, vhost, even USB gadget stuff… that's a lot of places. It's obviously a core function. Alright, I'm already tracking all these calls. So, the patch is adding `if (IS_ERR_OR_NULL(ctx)) return;` to `eventfd_ctx_put()`. That looks like a defensive check, guarding against a bad pointer. Makes sense, particularly given the broad usage of the function. I wonder, though, are there any potential side effects? It's good that they are focusing on adding this. Wait a second… before I dive deeper into the code that's calling it, I should also check if `include/linux/eventfd.h` has the dummy static inline for when `!CONFIG_EVENTFD`. Need to make sure the fix is correctly implemented. Checking that the header guard prevents the issues on kernels that don't even use eventfd would be a good step here. Let me jump over to those lines and make sure the inline is what I expect.
14/2	2026/09/15 14:24	tool	read-file	0m Args: { "File": "include/linux/eventfd.h", "FirstLine": 55, "LineCount": 40 } Results: { "Contents": " 55:\t\n 56:\tstatic inline struct eventfd_ctx eventfd_ctx_fdget(int fd)\n 57:\t{\n 58:\t\treturn ERR_PTR(-ENOSYS);\n 59:\t}\n 60:\t\n 61:\tstatic inline void eventfd_signal_mask(struct eventfd_ctx ctx, __poll_t mask)\n 62:\t{\n 63:\t}\n 64:\t\n 65:\tstatic inline void eventfd_ctx_put(struct eventfd_ctx ctx)\n 66:\t{\n 67:\t\n 68:\t}\n 69:\t\n 70:\tstatic inline int eventfd_ctx_remove_wait_queue(struct eventfd_ctx ctx,\n 71:\t\t\t\t\t\t\twait_queue_entry_t wait, __u64 cnt)\n 72:\t{\n 73:\t\treturn -ENOSYS;\n 74:\t}\n 75:\t\n 76:\tstatic inline bool eventfd_signal_allowed(void)\n 77:\t{\n 78:\t\treturn true;\n 79:\t}\n 80:\t\n 81:\tstatic inline void eventfd_ctx_do_read(struct eventfd_ctx ctx, __u64 cnt)\n 82:\t{\n 83:\t\n 84:\t}\n 85:\t\n 86:\t#endif\n 87:\t\n 88:\tstatic inline void eventfd_signal(struct eventfd_ctx ctx)\n 89:\t{\n 90:\t\teventfd_signal_mask(ctx, 0);\n 91:\t}\n 92:\t\n 93:\tDEFINE_FREE(eventfd, struct eventfd_ctx , eventfd_ctx_put(_T))\n 94:\t\n" }
15/2	2026/09/15 14:24	llm	patch-evaluator	13m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 21951 output: 28 thoughts: 1118 Thoughts: Analyzing a Kernel Crash Vulnerability and its Fix Okay, so I'm looking at this potential kernel issue, and it's all about how `eventfd` contexts are handled in the DRM (Direct Rendering Manager) subsystem, specifically in the context of sync objects. I'm focusing on the `drm_syncobj_eventfd_ioctl` function. I started by looking at `include/linux/eventfd.h`, where the `DEFINE_FREE` macro is defined for `eventfd_ctx`, and then I traced its usage in `fs/eventfd.c` and specifically `eventfd_ctx_put`. This function, crucially, decrements a reference counter (`kref`) associated with the eventfd context. The crux of the issue is in the interaction between `drm_syncobj_eventfd_ioctl` and `eventfd_ctx_put`. The function `drm_syncobj_eventfd_ioctl` retrieves an `eventfd_ctx` using `eventfd_ctx_fdget`. The code uses the `__free` attribute to call `eventfd_ctx_put` on exit. If `eventfd_ctx_fdget` fails (returning an error pointer like `-EBADF` or `-EINVAL`), the function jumps to `err_fdget`, triggering the cleanup on the error pointer. Here's the problem I see. Before the fix, `eventfd_ctx_put` didn't check if the `eventfd_ctx` pointer was an error pointer (using `IS_ERR_OR_NULL`). This meant that, if `eventfd_ctx_fdget` failed, calling `eventfd_ctx_put` on the returned error pointer would lead to an attempt to dereference a garbage pointer, causing a kernel crash (specifically, a page fault because `ctx->kref` would be invalid). This is a pretty straightforward use-after-free scenario. The patch I'm looking at fixes this by adding `if (IS_ERR_OR_NULL(ctx)) return;` at the beginning of `eventfd_ctx_put`. This simple check makes the function safe to call with error pointers, preventing the dereference and the crash. It's a textbook example of defensive programming, and a critical fix for a serious vulnerability. I also see that other failure paths are handled correctly, such as if `kzalloc_obj` fails. In those cases, the check also safely handles the `eventfd_ctx_put` call. Now, the important question is: is this code path reachable? The answer is YES! `DRM_IOCTL_SYNCOBJ_EVENTFD` is exposed through virtio-gpu (and potentially other virtual DRM devices). This means a user-space application could trigger this code, potentially exploiting this vulnerability (before the fix) to crash the kernel or worse. I need to check if vkms has `DRIVER_SYNCOBJ_TIMELINE`.
16/2	2026/09/15 14:38	tool	grepper	0m Args: { "Expression": "vkms", "PathPrefix": "drivers/gpu/drm/" } Results: { "Output": "\nFull output is too long, showing 500 out of 4708 lines.\nUse more precise expression if possible.\n\ndrivers/gpu/drm/Kconfig=361=source \"drivers/gpu/drm/virtio/Kconfig\"\ndrivers/gpu/drm/Kconfig:362:source \"drivers/gpu/drm/vkms/Kconfig\"\ndrivers/gpu/drm/Kconfig-363-source \"drivers/gpu/drm/vmwgfx/Kconfig\"\n--\ndrivers/gpu/drm/Makefile=186=obj-$(CONFIG_DRM_VGEM)\t+= vgem/\ndrivers/gpu/drm/Makefile:187:obj-$(CONFIG_DRM_VKMS)\t+= vkms/\ndrivers/gpu/drm/Makefile-188-obj-$(CONFIG_DRM_NOUVEAU) +=nouveau/\n--\ndrivers/gpu/drm/amd/amdgpu/Makefile=148=amdgpu-y += \\\ndrivers/gpu/drm/amd/amdgpu/Makefile-149-\tdce_v10_0.o \\\ndrivers/gpu/drm/amd/amdgpu/Makefile:150:\tamdgpu_vkms.o\ndrivers/gpu/drm/amd/amdgpu/Makefile-151-\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu.h=621=struct amdgpu_device {\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu.h-707-\tbool\t\t\t\tenable_virtual_display;\ndrivers/gpu/drm/amd/amdgpu/amdgpu.h:708:\tstruct amdgpu_vkms_output amdgpu_vkms_output;\ndrivers/gpu/drm/amd/amdgpu/amdgpu.h-709-\tstruct amdgpu_mode_info\t\tmode_info;\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c-102-#include \"jpeg_v4_0_5.h\"\ndrivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c:103:#include \"amdgpu_vkms.h\"\ndrivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c-104-#include \"mes_v11_0.h\"\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c=2642=static void amdgpu_discovery_set_sriov_display(struct amdgpu_device adev)\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c-2644-\tamdgpu_device_set_sriov_virtual_display(adev);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c:2645:\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c-2646-}\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c=2649=static int amdgpu_discovery_set_display_ip_blocks(struct amdgpu_device adev)\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c-2651-\tif (adev-\u003eenable_virtual_display) {\ndrivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c:2652:\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c-2653-\t\treturn 0;\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-18-#include \"ivsrcid/ivsrcid_vislands30.h\"\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:19:#include \"amdgpu_vkms.h\"\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-20-#include \"amdgpu_display.h\"\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-24-/\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:25: DOC: amdgpu_vkms\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-26- \ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:27: The amdgpu vkms interface provides a virtual KMS interface for several use\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-28- * cases: devices without display hardware, platforms where the actual display\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-31- * usable. We previously emulated a legacy KMS interface, but there was a desire\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:32: * to move to the atomic KMS interface. The vkms driver did everything we\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-33- * needed, but we wanted KMS support natively in the driver without buffer\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-34- * sharing and the ability to support an instance of VKMS per device. We first\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:35: * looked at splitting vkms into a stub driver and a helper module that other\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-36- * drivers could use to implement a virtual display, but this strategy ended up\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-37- * being messy due to driver specific callbacks needed for buffer management.\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:38: * Ultimately, it proved easier to import the vkms code as it mostly used core\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-39- * drm helpers anyway.\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-41-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:42:static const u32 amdgpu_vkms_formats[] = {\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-43-\tDRM_FORMAT_XRGB8888,\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-45-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:46:static const struct drm_crtc_funcs amdgpu_vkms_crtc_funcs = {\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-47-\t.set_config = drm_atomic_helper_set_config,\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-55-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:56:static const struct drm_crtc_helper_funcs amdgpu_vkms_crtc_helper_funcs = {\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-57-\tDRM_CRTC_HELPER_VBLANK_FUNCS,\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-59-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:60:static int amdgpu_vkms_crtc_init(struct drm_device dev, struct drm_crtc crtc,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-61-\t\t\t struct drm_plane primary, struct drm_plane cursor)\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-67-\tret = drm_crtc_init_with_planes(dev, crtc, primary, cursor,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:68:\t\t\t\t\t\u0026amdgpu_vkms_crtc_funcs, NULL);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-69-\tif (ret) {\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-73-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:74:\tdrm_crtc_helper_add(crtc, \u0026amdgpu_vkms_crtc_helper_funcs);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-75-\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-85-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:86:static const struct drm_connector_funcs amdgpu_vkms_connector_funcs = {\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-87-\t.fill_modes = drm_helper_probe_single_connector_modes,\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-93-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:94:static int amdgpu_vkms_conn_get_modes(struct drm_connector connector)\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-95-{\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-138-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:139:static const struct drm_connector_helper_funcs amdgpu_vkms_conn_helper_funcs = {\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:140:\t.get_modes = amdgpu_vkms_conn_get_modes,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-141-};\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-142-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:143:static const struct drm_plane_funcs amdgpu_vkms_plane_funcs = {\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-144-\t.update_plane\t\t= drm_atomic_helper_update_plane,\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-151-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:152:static void amdgpu_vkms_plane_atomic_update(struct drm_plane plane,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-153-\t\t\t\t\t struct drm_atomic_commit old_state)\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-157-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:158:static int amdgpu_vkms_plane_atomic_check(struct drm_plane plane,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-159-\t\t\t\t\t struct drm_atomic_commit state)\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-187-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:188:static int amdgpu_vkms_prepare_fb(struct drm_plane plane,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-189-\t\t\t\t struct drm_plane_state new_state)\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-257-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:258:static void amdgpu_vkms_cleanup_fb(struct drm_plane plane,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-259-\t\t\t\t struct drm_plane_state old_state)\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-285-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:286:static const struct drm_plane_helper_funcs amdgpu_vkms_primary_helper_funcs = {\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:287:\t.atomic_update\t\t= amdgpu_vkms_plane_atomic_update,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:288:\t.atomic_check\t\t= amdgpu_vkms_plane_atomic_check,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:289:\t.prepare_fb\t\t= amdgpu_vkms_prepare_fb,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:290:\t.cleanup_fb\t\t= amdgpu_vkms_cleanup_fb,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-291-};\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-292-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:293:static struct drm_plane amdgpu_vkms_plane_init(struct drm_device dev,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-294-\t\t\t\t\t\tenum drm_plane_type type,\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-304-\tret = drm_universal_plane_init(dev, plane, 1 \u003c\u003c index,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:305:\t\t\t\t \u0026amdgpu_vkms_plane_funcs,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:306:\t\t\t\t amdgpu_vkms_formats,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:307:\t\t\t\t ARRAY_SIZE(amdgpu_vkms_formats),\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-308-\t\t\t\t NULL, type, NULL);\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-313-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:314:\tdrm_plane_helper_add(plane, \u0026amdgpu_vkms_primary_helper_funcs);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-315-\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c=319=static const struct drm_encoder_funcs drm_encoder_funcs_cleanup = {\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-322-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:323:static int amdgpu_vkms_output_init(struct drm_device dev, struct\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:324:\t\t\t\t amdgpu_vkms_output output, int index)\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-325-{\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-331-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:332:\tprimary = amdgpu_vkms_plane_init(dev, DRM_PLANE_TYPE_PRIMARY, index);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-333-\tif (IS_ERR(primary))\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-335-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:336:\tret = amdgpu_vkms_crtc_init(dev, crtc, primary, cursor);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-337-\tif (ret)\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-339-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:340:\tret = drm_connector_init(dev, connector, \u0026amdgpu_vkms_connector_funcs,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-341-\t\t\t\t DRM_MODE_CONNECTOR_VIRTUAL);\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-346-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:347:\tdrm_connector_helper_add(connector, \u0026amdgpu_vkms_conn_helper_funcs);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-348-\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-382-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:383:const struct drm_mode_config_funcs amdgpu_vkms_mode_funcs = {\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-384-\t.fb_create = amdgpu_display_user_framebuffer_create,\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-388-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:389:static int amdgpu_vkms_sw_init(struct amdgpu_ip_block ip_block)\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-390-{\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-393-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:394:\tadev-\u003eamdgpu_vkms_output = kzalloc_objs(struct amdgpu_vkms_output,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-395-\t\t\t\t\t\tadev-\u003emode_info.num_crtc);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:396:\tif (!adev-\u003eamdgpu_vkms_output)\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-397-\t\treturn -ENOMEM;\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-400-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:401:\tadev_to_drm(adev)-\u003emode_config.funcs = \u0026amdgpu_vkms_mode_funcs;\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-402-\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-416-\tfor (i = 0; i \u003c adev-\u003emode_info.num_crtc; i++) {\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:417:\t\tr = amdgpu_vkms_output_init(adev_to_drm(adev), \u0026adev-\u003eamdgpu_vkms_output[i], i);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-418-\t\tif (r)\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-431-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:432:static int amdgpu_vkms_sw_fini(struct amdgpu_ip_block ip_block)\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-433-{\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-441-\tdrm_edid_free(adev-\u003emode_info.bios_hardcoded_edid);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:442:\tkfree(adev-\u003eamdgpu_vkms_output);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-443-\treturn 0;\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-445-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:446:static int amdgpu_vkms_hw_init(struct amdgpu_ip_block ip_block)\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-447-{\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-483-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:484:static int amdgpu_vkms_hw_fini(struct amdgpu_ip_block ip_block)\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-485-{\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-488-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:489:static int amdgpu_vkms_suspend(struct amdgpu_ip_block ip_block)\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-490-{\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-500-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:501:static int amdgpu_vkms_resume(struct amdgpu_ip_block ip_block)\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-502-{\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-504-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:505:\tr = amdgpu_vkms_hw_init(ip_block);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-506-\tif (r)\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-510-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:511:static bool amdgpu_vkms_is_idle(struct amdgpu_ip_block ip_block)\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-512-{\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-515-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:516:static int amdgpu_vkms_set_clockgating_state(struct amdgpu_ip_block ip_block,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-517-\t\t\t\t\t enum amd_clockgating_state state)\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-521-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:522:static int amdgpu_vkms_set_powergating_state(struct amdgpu_ip_block ip_block,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-523-\t\t\t\t\t enum amd_powergating_state state)\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-527-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:528:static const struct amd_ip_funcs amdgpu_vkms_ip_funcs = {\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:529:\t.name = \"amdgpu_vkms\",\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:530:\t.sw_init = amdgpu_vkms_sw_init,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:531:\t.sw_fini = amdgpu_vkms_sw_fini,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:532:\t.hw_init = amdgpu_vkms_hw_init,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:533:\t.hw_fini = amdgpu_vkms_hw_fini,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:534:\t.suspend = amdgpu_vkms_suspend,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:535:\t.resume = amdgpu_vkms_resume,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:536:\t.is_idle = amdgpu_vkms_is_idle,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:537:\t.set_clockgating_state = amdgpu_vkms_set_clockgating_state,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:538:\t.set_powergating_state = amdgpu_vkms_set_powergating_state,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-539-};\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-540-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:541:const struct amdgpu_ip_block_version amdgpu_vkms_ip_block = {\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-542-\t.type = AMD_IP_BLOCK_TYPE_DCE,\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-545-\t.rev = 0,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:546:\t.funcs = \u0026amdgpu_vkms_ip_funcs,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-547-};\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h-11-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h:12:#define drm_crtc_to_amdgpu_vkms_output(target) \\\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h:13:\tcontainer_of(target, struct amdgpu_vkms_output, crtc.base)\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h-14-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h:15:extern const struct amdgpu_ip_block_version amdgpu_vkms_ip_block;\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h-16-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h:17:struct amdgpu_vkms_output {\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h-18-\tstruct amdgpu_crtc crtc;\n--\ndrivers/gpu/drm/amd/amdgpu/cik.c-73-#include \"amdgpu_amdkfd.h\"\ndrivers/gpu/drm/amd/amdgpu/cik.c:74:#include \"amdgpu_vkms.h\"\ndrivers/gpu/drm/amd/amdgpu/cik.c-75-\n--\ndrivers/gpu/drm/amd/amdgpu/cik.c=2186=int cik_set_ip_blocks(struct amdgpu_device adev)\n--\ndrivers/gpu/drm/amd/amdgpu/cik.c-2196-\t\tif (adev-\u003eenable_virtual_display)\ndrivers/gpu/drm/amd/amdgpu/cik.c:2197:\t\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/cik.c-2198-#if defined(CONFIG_DRM_AMD_DC)\n--\ndrivers/gpu/drm/amd/amdgpu/cik.c-2214-\t\tif (adev-\u003eenable_virtual_display)\ndrivers/gpu/drm/amd/amdgpu/cik.c:2215:\t\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/cik.c-2216-#if defined(CONFIG_DRM_AMD_DC)\n--\ndrivers/gpu/drm/amd/amdgpu/cik.c-2232-\t\tif (adev-\u003eenable_virtual_display)\ndrivers/gpu/drm/amd/amdgpu/cik.c:2233:\t\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/cik.c-2234-#if defined(CONFIG_DRM_AMD_DC)\n--\ndrivers/gpu/drm/amd/amdgpu/cik.c-2252-\t\tif (adev-\u003eenable_virtual_display)\ndrivers/gpu/drm/amd/amdgpu/cik.c:2253:\t\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/cik.c-2254-#if defined(CONFIG_DRM_AMD_DC)\n--\ndrivers/gpu/drm/amd/amdgpu/nv.c-61-#include \"jpeg_v3_0.h\"\ndrivers/gpu/drm/amd/amdgpu/nv.c:62:#include \"amdgpu_vkms.h\"\ndrivers/gpu/drm/amd/amdgpu/nv.c-63-#include \"mxgpu_nv.h\"\n--\ndrivers/gpu/drm/amd/amdgpu/si.c-72-#include \"amdgpu_dm.h\"\ndrivers/gpu/drm/amd/amdgpu/si.c:73:#include \"amdgpu_vkms.h\"\ndrivers/gpu/drm/amd/amdgpu/si.c-74-\n--\ndrivers/gpu/drm/amd/amdgpu/si.c=2687=int si_set_ip_blocks(struct amdgpu_device adev)\n--\ndrivers/gpu/drm/amd/amdgpu/si.c-2699-\t\tif (adev-\u003eenable_virtual_display)\ndrivers/gpu/drm/amd/amdgpu/si.c:2700:\t\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/si.c-2701-#if defined(CONFIG_DRM_AMD_DC) \u0026\u0026 defined(CONFIG_DRM_AMD_DC_SI)\n--\ndrivers/gpu/drm/amd/amdgpu/si.c-2717-\t\tif (adev-\u003eenable_virtual_display)\ndrivers/gpu/drm/amd/amdgpu/si.c:2718:\t\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/si.c-2719-#if defined(CONFIG_DRM_AMD_DC) \u0026\u0026 defined(CONFIG_DRM_AMD_DC_SI)\n--\ndrivers/gpu/drm/amd/amdgpu/si.c-2734-\t\tif (adev-\u003eenable_virtual_display)\ndrivers/gpu/drm/amd/amdgpu/si.c:2735:\t\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/si.c-2736-\t\tbreak;\n--\ndrivers/gpu/drm/amd/amdgpu/soc15.c-75-#include \"smuio_v13_0.h\"\ndrivers/gpu/drm/amd/amdgpu/soc15.c:76:#include \"amdgpu_vkms.h\"\ndrivers/gpu/drm/amd/amdgpu/soc15.c-77-#include \"mxgpu_ai.h\"\n--\ndrivers/gpu/drm/amd/amdgpu/vi.c-79-#endif\ndrivers/gpu/drm/amd/amdgpu/vi.c:80:#include \"amdgpu_vkms.h\"\ndrivers/gpu/drm/amd/amdgpu/vi.c-81-#include \"mxgpu_vi.h\"\n--\ndrivers/gpu/drm/amd/amdgpu/vi.c=2048=int vi_set_ip_blocks(struct amdgpu_device adev)\n--\ndrivers/gpu/drm/amd/amdgpu/vi.c-2061-\t\tif (adev-\u003eenable_virtual_display)\ndrivers/gpu/drm/amd/amdgpu/vi.c:2062:\t\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/vi.c-2063-\t\tbreak;\n--\ndrivers/gpu/drm/amd/amdgpu/vi.c-2071-\t\tif (adev-\u003eenable_virtual_display)\ndrivers/gpu/drm/amd/amdgpu/vi.c:2072:\t\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/vi.c-2073-#if defined(CONFIG_DRM_AMD_DC)\n--\ndrivers/gpu/drm/amd/amdgpu/vi.c-2091-\t\tif (adev-\u003eenable_virtual_display)\ndrivers/gpu/drm/amd/amdgpu/vi.c:2092:\t\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/vi.c-2093-#if defined(CONFIG_DRM_AMD_DC)\n--\ndrivers/gpu/drm/amd/amdgpu/vi.c-2114-\t\tif (adev-\u003eenable_virtual_display)\ndrivers/gpu/drm/amd/amdgpu/vi.c:2115:\t\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/vi.c-2116-#if defined(CONFIG_DRM_AMD_DC)\n--\ndrivers/gpu/drm/amd/amdgpu/vi.c-2130-\t\tif (adev-\u003eenable_virtual_display)\ndrivers/gpu/drm/amd/amdgpu/vi.c:2131:\t\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/vi.c-2132-#if defined(CONFIG_DRM_AMD_DC)\n--\ndrivers/gpu/drm/amd/amdgpu/vi.c-2149-\t\tif (adev-\u003eenable_virtual_display)\ndrivers/gpu/drm/amd/amdgpu/vi.c:2150:\t\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/vi.c-2151-#if defined(CONFIG_DRM_AMD_DC)\n--\ndrivers/gpu/drm/ci/igt_runner.sh=25=case \"$DRIVER_NAME\" in\ndrivers/gpu/drm/ci/igt_runner.sh:26: amdgpu\|vkms\|panthor)\ndrivers/gpu/drm/ci/igt_runner.sh-27- # Cannot use HWCI_KERNEL_MODULES as at that point we don't have the module in /lib\n--\ndrivers/gpu/drm/ci/test.yml=469=virtio_gpu:none:\n--\ndrivers/gpu/drm/ci/test.yml-476-\ndrivers/gpu/drm/ci/test.yml:477:vkms:none:\ndrivers/gpu/drm/ci/test.yml-478- extends:\n--\ndrivers/gpu/drm/ci/test.yml-480- variables:\ndrivers/gpu/drm/ci/test.yml:481: DRIVER_NAME: vkms\ndrivers/gpu/drm/ci/test.yml-482- GPU_VERSION: none\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:1:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-2-# Bug Report: https://lore.kernel.org/dri-devel/61ed26af-062c-443c-9df2-d1ee319f3fb0@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=6=kms_cursor_legacy@long-nonblocking-modeset-vs-cursor-atomic\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-7-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:8:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-9-# Bug Report: https://lore.kernel.org/dri-devel/61ed26af-062c-443c-9df2-d1ee319f3fb0@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=13=kms_flip@basic-flip-vs-wf_vblank\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-14-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:15:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-16-# Bug Report: https://lore.kernel.org/dri-devel/61ed26af-062c-443c-9df2-d1ee319f3fb0@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=20=kms_flip@flip-vs-expired-vblank-interruptible\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-21-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:22:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-23-# Bug Report: https://lore.kernel.org/dri-devel/61ed26af-062c-443c-9df2-d1ee319f3fb0@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=27=kms_flip@flip-vs-wf_vblank-interruptible\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-28-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:29:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-30-# Bug Report: https://lore.kernel.org/dri-devel/61ed26af-062c-443c-9df2-d1ee319f3fb0@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=34=kms_flip@plain-flip-fb-recreate-interruptible\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-35-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:36:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-37-# Bug Report: https://lore.kernel.org/dri-devel/61ed26af-062c-443c-9df2-d1ee319f3fb0@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=41=kms_flip@plain-flip-ts-check\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-42-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:43:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-44-# Bug Report: https://lore.kernel.org/dri-devel/61ed26af-062c-443c-9df2-d1ee319f3fb0@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=48=kms_flip@plain-flip-ts-check-interruptible\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-49-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:50:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-51-# Bug Report: https://lore.kernel.org/dri-devel/61ed26af-062c-443c-9df2-d1ee319f3fb0@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=55=kms_flip@flip-vs-absolute-wf_vblank\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-56-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:57:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-58-# Bug Report: https://lore.kernel.org/dri-devel/61ed26af-062c-443c-9df2-d1ee319f3fb0@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=62=kms_flip@flip-vs-absolute-wf_vblank-interruptible\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-63-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:64:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-65-# Bug Report: https://lore.kernel.org/dri-devel/61ed26af-062c-443c-9df2-d1ee319f3fb0@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=69=kms_flip@flip-vs-blocking-wf-vblank\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-70-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:71:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-72-# Bug Report: https://lore.kernel.org/dri-devel/61ed26af-062c-443c-9df2-d1ee319f3fb0@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=76=kms_cursor_legacy@flip-vs-cursor-varying-size\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-77-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:78:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-79-# Bug Report: https://lore.kernel.org/dri-devel/61ed26af-062c-443c-9df2-d1ee319f3fb0@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=83=kms_flip@flip-vs-expired-vblank\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-84-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:85:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-86-# Bug Report: https://lore.kernel.org/dri-devel/61ed26af-062c-443c-9df2-d1ee319f3fb0@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=90=kms_pipe_crc_basic@nonblocking-crc-frame-sequence\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-91-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:92:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-93-# Bug Report: https://lore.kernel.org/dri-devel/2364a6bf-e6bc-4741-8c78-cea8bdb06e03@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=97=kms_flip@modeset-vs-vblank-race\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-98-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:99:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-100-# Bug Report: https://lore.kernel.org/dri-devel/f7d72ed9-a783-46d7-b75d-54072bda32a3@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=104=kms_pipe_crc_basic@suspend-read-crc\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-105-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:106:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-107-# Bug Report: https://lore.kernel.org/dri-devel/98d3ba54-bcb9-41ab-adb1-a18ba61ee2e4@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=111=kms_plane@plane-panning-bottom-right-suspend\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-112-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:113:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-114-# Bug Report: https://lore.kernel.org/dri-devel/b58d15eb-094d-4ac2-aad3-83e518c2f55d@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:1:# keeps printing vkms_vblank_simulate: vblank timer overrun and never ends\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-2-kms_invalid_mode@int-max-clock\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt=6=kms_cursor_crc.\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-10-# Hardware name: ChromiumOS crosvm, BIOS 0\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:11:# Workqueue: vkms_composer vkms_composer_worker [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:12:# RIP: 0010:compose_active_planes+0x1c7/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-13-# Code: c9 0f 84 6a 01 00 00 8b 42 30 2b 42 28 41 39 c5 0f 8c 6f 01 00 00 49 83 c7 01 49 39 df 74 3b 4b 8b 34 fc 48 8b 96 48 01 00 00 \u003c8b\u003e 42 78 89 c1 ...\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-28-# ? asm_exc_page_fault+0x26/0x30\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:29:# ? compose_active_planes+0x1c7/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:30:# ? compose_active_planes+0x2a3/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-31-# ? srso_return_thunk+0x5/0x5f\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:32:# vkms_composer_worker+0x205/0x240 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-33-# process_one_work+0x1f4/0x6b0\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-42-# \u003c/TASK\u003e\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:43:# Modules linked in: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-44-# CR2: 0000000000000078\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-45-# ---[ end trace 0000000000000000 ]---\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:46:# RIP: 0010:compose_active_planes+0x1c7/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-47-# Code: c9 0f 84 6a 01 00 00 8b 42 30 2b 42 28 41 39 c5 0f 8c 6f 01 00 00 49 83 c7 01 49 39 df 74 3b 4b 8b 34 fc 48 8b 96 48 01 00 00 \u003c8b\u003e 42 78 89 c1 ...\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-61-# Hardware name: ChromiumOS crosvm, BIOS 0\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:62:# Workqueue: vkms_composer vkms_composer_worker [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:63:# RIP: 0010:compose_active_planes+0x1c7/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-64-# Code: c9 0f 84 6a 01 00 00 8b 42 30 2b 42 28 41 39 c5 0f 8c 6f 01 00 00 49 83 c7 01 49 39 df 74 3b 4b 8b 34 fc 48 8b 96 48 01 00 00 \u003c8b\u003e 42 78 89 c1 ...\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-79-# ? asm_exc_page_fault+0x26/0x30\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:80:# ? compose_active_planes+0x1c7/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:81:# ? compose_active_planes+0x2a3/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-82-# ? srso_return_thunk+0x5/0x5f\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:83:# vkms_composer_worker+0x205/0x240 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-84-# process_one_work+0x1f4/0x6b0\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-93-# \u003c/TASK\u003e\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:94:# Modules linked in: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-95-# CR2: 0000000000000078\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-96-# ---[ end trace 0000000000000000 ]---\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:97:# RIP: 0010:compose_active_planes+0x1c7/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-98-# Code: c9 0f 84 6a 01 00 00 8b 42 30 2b 42 28 41 39 c5 0f 8c 6f 01 00 00 49 83 c7 01 49 39 df 74 3b 4b 8b 34 fc 48 8b 96 48 01 00 00 \u003c8b\u003e 42 78 89 c1 ...\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-112-# Hardware name: ChromiumOS crosvm, BIOS 0\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:113:# Workqueue: vkms_composer vkms_composer_worker [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:114:# RIP: 0010:compose_active_planes+0x344/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-115-# Code: 6a 34 0f 8e 91 fe ff ff 44 89 ea 48 8d 7c 24 48 e8 71 f0 ff ff 4b 8b 04 fc 48 8b 4c 24 50 48 8b 7c 24 40 48 8b 80 48 01 00 00 \u003c48\u003e 63 70 18 8b...\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-130-# ? asm_exc_page_fault+0x26/0x30\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:131:# ? compose_active_planes+0x344/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:132:# ? compose_active_planes+0x32f/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-133-# ? srso_return_thunk+0x5/0x5f\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:134:# vkms_composer_worker+0x205/0x240 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-135-# process_one_work+0x201/0x6c0\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-144-# \u003c/TASK\u003e\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:145:# Modules linked in: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-146-# CR2: 0000000000000018\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-147-# ---[ end trace 0000000000000000 ]---\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:148:# RIP: 0010:compose_active_planes+0x344/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-149-# Code: 6a 34 0f 8e 91 fe ff ff 44 89 ea 48 8d 7c 24 48 e8 71 f0 ff ff 4b 8b 04 fc 48 8b 4c 24 50 48 8b 7c 24 40 48 8b 80 48 01 00 00 \u003c48\u003e 63 70 18 8b...\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt=160=kms_cursor_edge_walk@128x128-right-edge\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-163-# Hardware name: ChromiumOS crosvm, BIOS 0\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:164:# Workqueue: vkms_composer vkms_composer_worker [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:165:# RIP: 0010:compose_active_planes+0x344/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-166-# Code: 6a 34 0f 8e 91 fe ff ff 44 89 ea 48 8d 7c 24 48 e8 71 f0 ff ff 4b 8b 04 fc 48 8b 4c 24 50 48 8b 7c 24 40 48 8b 80 48 01 00 00 \u003c48\u003e 63 70 18 8b...\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-183-# ? asm_exc_page_fault+0x26/0x30\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:184:# ? compose_active_planes+0x344/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:185:# ? compose_active_planes+0x32f/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-186-# ? srso_return_thunk+0x5/0x5f\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:187:# vkms_composer_worker+0x205/0x240 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-188-# process_one_work+0x201/0x6c0\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-197-# \u003c/TASK\u003e\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:198:# Modules linked in: vkms\n\n" }
17/2	2026/09/15 14:38	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 39887 output: 32 thoughts: 30 Thoughts: Okay, here's my take on those thoughts, framed as an expert's internal monologue: Diving into the VKMS Driver Alright, time to get my hands dirty and really understand what the Virtual KMS driver, `vkms_drv.c`, brings to the table. I need a clear picture of its capabilities. Specifically, I'm thinking of checking out `drivers/gpu/drm/vkms/vkms_drv.c` to do a deep dive and get a good grasp of the driver's feature set. This will help inform a better architectural plan. So, I’m going to start by going through the code. I need to see what this thing actually does.
18/2	2026/09/15 14:38	tool	grepper	0m Args: { "Expression": "driver_features", "PathPrefix": "drivers/gpu/drm/vkms/" } Results: { "Output": "drivers/gpu/drm/vkms/vkms_drv.c=93=static const struct drm_driver vkms_driver = {\ndrivers/gpu/drm/vkms/vkms_drv.c:94:\t.driver_features\t= DRIVER_MODESET \| DRIVER_ATOMIC \| DRIVER_GEM,\ndrivers/gpu/drm/vkms/vkms_drv.c-95-\t.fops\t\t\t= \u0026vkms_driver_fops,\n" }
19/2	2026/09/15 14:38	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 40223 output: 32 thoughts: 56 Thoughts: Here's my summary, as if I were thinking these thoughts: Digging into Synchronization Objects Alright, so `vkms` is giving me some trouble with `DRIVER_SYNCOBJ_TIMELINE`. That's a bit unexpected. But, hold on a minute, I seem to recall that `virtio_gpu` might support it. Let me just quickly confirm that. Hmm, let me just open the source tree... Okay, now, before I get too deep into this, I should probably check `vgem` just in case I am missing something. I'll need to look at `drivers/gpu/drm/vgem/vgem_drv.c` and see if the timeline support is in there, or if I should even expect it to be. Better to be thorough, I suppose.
20/2	2026/09/15 14:38	tool	grepper	0m Args: { "Expression": "driver_features", "PathPrefix": "drivers/gpu/drm/vgem/" } Results: { "Output": "drivers/gpu/drm/vgem/vgem_drv.c=110=static const struct drm_driver vgem_driver = {\ndrivers/gpu/drm/vgem/vgem_drv.c:111:\t.driver_features\t\t= DRIVER_GEM \| DRIVER_RENDER,\ndrivers/gpu/drm/vgem/vgem_drv.c-112-\t.open\t\t\t\t= vgem_open,\n" }
21/2	2026/09/15 14:38	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 40599 output: 31 thoughts: 306 Thoughts: Virtio-GPU and Syncobj: A Syzkaller Investigation Okay, so I'm diving into virtio-gpu, specifically looking at its driver implementation (`drivers/gpu/drm/virtio/virtgpu_drv.c`). It's a standard virtio hardware component that's well-supported in QEMU. That's a good starting point. I see it's a modesetting driver, supports GEM, rendering, atomic operations, sync objects, timelines and even cursor hot spots. Now, I'm thinking about `eventfd`. It's a fundamental part of the core filesystem (`fs/eventfd.c`), with functions like `eventfd_ctx_put` living there. The real question is: does syzkaller, my go-to fuzzing tool, have DRM ioctls enabled? Specifically, does it support `DRM_IOCTL_SYNCOBJ_EVENTFD`? A quick check confirms it! Syzkaller does have descriptions for `drm_syncobj_eventfd` in its `sys/linux/drm.txt` file. Perfect! It even has the structure definition: `ioctl$DRM_IOCTL_SYNCOBJ_EVENTFD(fd fd_drm, cmd const[DRM_IOCTL_SYNCOBJ_EVENTFD], arg ptr[in, drm_syncobj_eventfd])`. Next, I need to understand the Kconfig dependencies. What configurations actually enable `drm_syncobj.c`? Gotta dig through the Kconfig files. Time to grep for `drm_syncobj.o` in the `drivers/gpu/drm/Makefile` to find out. This is all very promising for potential fuzzing targets.
22/2	2026/09/15 14:39	tool	grepper	0m Args: { "Expression": "drm_syncobj\\.o", "PathPrefix": "drivers/gpu/drm" } Results: { "Output": "drivers/gpu/drm/Makefile=35=drm-y := \\\n--\ndrivers/gpu/drm/Makefile-68-\tdrm_rect.o \\\ndrivers/gpu/drm/Makefile:69:\tdrm_syncobj.o \\\ndrivers/gpu/drm/Makefile-70-\tdrm_sysfs.o \\\n" }
23/2	2026/09/15 14:39	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 41393 output: 25 thoughts: 77 Thoughts: My Line of Inquiry: DRM Sync Objects and EventFD Okay, so `drm_syncobj.o` is a fundamental part of the Direct Rendering Manager (DRM) ecosystem – built in whenever `CONFIG_DRM` is turned on, which is good to remember for future debugging. It's an implicit dependency, and understanding its role is key. And, to be specific, `virtio-gpu`'s inclusion is controlled by `CONFIG_DRM_VIRTIO_GPU`, so I'll keep that configuration option in mind. Now, my current focus is on `fs/eventfd.c`. I have a feeling there is an overlap in the architecture. Let me quickly double-check the `fs/Makefile` to see how `eventfd.o` is handled at build time. A quick grep should reveal any relevant rules or dependencies. I need to understand its relationship to these other DRM components.
24/2	2026/09/15 14:39	tool	grepper	0m Args: { "Expression": "eventfd\\.o", "PathPrefix": "fs" } Results: { "Output": "fs/Makefile=28=obj-$(CONFIG_TIMERFD)\t\t+= timerfd.o\nfs/Makefile:29:obj-$(CONFIG_EVENTFD)\t\t+= eventfd.o\nfs/Makefile-30-obj-$(CONFIG_AIO) += aio.o\n" }
25/2	2026/09/15 14:39	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 41769 output: 37 thoughts: 59 Thoughts: Examining the Kernel Configuration for Virtualized Graphics Okay, so I'm looking at kernel configurations related to graphics and virtualized environments. My immediate focus is on how eventfd and DRM are integrated, given their importance in modern graphics stacks. I want to delve into this interaction further. I'll start by checking the `CONFIG_DRM_VIRTIO_GPU` option. This seems like the key to virtualized graphics through the virtio interface. To understand how it's configured and what dependencies it has, I'll go straight to the source, the `drivers/gpu/drm/virtio/Kconfig` file. I need to understand this Kconfig file now. This will likely show me the prerequisites for `CONFIG_DRM_VIRTIO_GPU`, which features can be enabled, and how everything is connected. This should give me a better handle on the kernel configuration for virtio-based virtualized GPUs.
26/2	2026/09/15 14:39	tool	read-file	0m Args: { "File": "drivers/gpu/drm/virtio/Kconfig", "FirstLine": 1, "LineCount": 30 } Results: { "Contents": " 1:\t# SPDX-License-Identifier: GPL-2.0-only\n 2:\tconfig DRM_VIRTIO_GPU\n 3:\t\ttristate \"Virtio GPU driver\"\n 4:\t\tdepends on DRM \u0026\u0026 VIRTIO_MENU \u0026\u0026 MMU\n 5:\t\tselect VIRTIO\n 6:\t\tselect DRM_CLIENT_SELECTION\n 7:\t\tselect DRM_KMS_HELPER\n 8:\t\tselect DRM_GEM_SHMEM_HELPER\n 9:\t\tselect VIRTIO_DMA_SHARED_BUFFER\n 10:\t\thelp\n 11:\t\t This is the virtual GPU driver for virtio. It can be used with\n 12:\t\t QEMU based VMMs (like KVM or Xen).\n 13:\t\n 14:\t\t If unsure say M.\n 15:\t\n 16:\tconfig DRM_VIRTIO_GPU_KMS\n 17:\t\tbool \"Virtio GPU driver modesetting support\"\n 18:\t\tdepends on DRM_VIRTIO_GPU\n 19:\t\tdefault y\n 20:\t\thelp\n 21:\t\t Enable modesetting support for virtio GPU driver. This can be\n 22:\t\t disabled in cases where only \"headless\" usage of the GPU is\n 23:\t\t required.\n 24:\t\n 25:\t\t If unsure, say Y.\n" }
27/2	2026/09/15 14:39	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 42410 output: 17 thoughts: 43 Thoughts: Okay, here's my thought process as if I were considering this myself, tailored for a fellow expert: Investigating the EVENTFD Configuration Alright, time to dive into this `CONFIG_EVENTFD` situation. My first move is to confirm where it's defined and what context it's in. Let's start by checking the obvious location: the `fs/Kconfig` file. Given the name, it's highly likely it's a filesystem-related feature. Now, just to be thorough and cover all bases in the initial scoping, I'll quickly grep across `init/Kconfig` too, just in case it's declared there. Grabbing a simple search term like `config EVENTFD` should yield the precise definition in either file. I'm aiming for a quick and targeted scan to ensure I haven't missed anything obvious.
28/2	2026/09/15 14:39	tool	grepper	0m Args: { "Expression": "config EVENTFD" } Results: { "Output": "init/Kconfig=1923=config TIMERFD\n--\ninit/Kconfig-1931-\ninit/Kconfig:1932:config EVENTFD\ninit/Kconfig-1933-\tbool \"Enable eventfd() system call\" if EXPERT\n" }
29/2	2026/09/15 14:39	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 42730 output: 33 thoughts: 14 Thoughts: Here's a summary of my immediate thought process: Kconfig Dive: Investigating a Specific Year Okay, so I'm thinking, "Where should I start looking to understand or address something related to the year 1932 within this context?" My gut reaction is to check the `init/Kconfig` file. That's usually the go-to place for core system configuration and dependencies. It's a fundamental part of the build system. Let's see if 1932 is defined there, or if there's any indication of its relevance within the configuration options. It's the most logical first step when dealing with configuration parameters.
30/2	2026/09/15 14:40	tool	read-file	0m Args: { "File": "init/Kconfig", "FirstLine": 1930, "LineCount": 15 } Results: { "Contents": "1930:\t\t If unsure, say Y.\n1931:\t\n1932:\tconfig EVENTFD\n1933:\t\tbool \"Enable eventfd() system call\" if EXPERT\n1934:\t\tdefault y\n1935:\t\thelp\n1936:\t\t Enable the eventfd() system call that allows to receive both\n1937:\t\t kernel notification (ie. KAIO) or userspace notifications.\n1938:\t\n1939:\t\t If unsure, say Y.\n1940:\t\n1941:\tconfig SHMEM\n1942:\t\tbool \"Use full shmem filesystem\" if EXPERT\n1943:\t\tdefault y\n1944:\t\tdepends on MMU\n" }
31/2	2026/09/15 14:40	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 43117 output: 20 thoughts: 753 Thoughts: Analyzing Function Call Scope for Fuzzing Prioritization Alright, let's break this down. We're looking at configurations related to eventfds (`CONFIG_EVENTFD`), Direct Rendering Manager (`CONFIG_DRM`), and specifically the VirtIO GPU in DRM (`CONFIG_DRM_VIRTIO_GPU`). The task is to identify key functions for fuzzing. My initial thought is to examine the changes. I see two functions were modified: `drm_syncobj_eventfd_ioctl` in `drivers/gpu/drm/drm_syncobj.c` and `eventfd_ctx_put` in `fs/eventfd.c`. Now, the red flag goes up. The documentation warns against listing "ubiquitous lifecycle hot-paths." I have to ask myself: Is `eventfd_ctx_put` ubiquitous? It's called when an eventfd context is closed or released, so no, it's pretty specific. It's not memory allocation, a page fault handler, or core synchronization. But, and this is the important part, could it be called by almost every program in the corpus? No, it's only programs that use eventfd, such as KVM, io_uring eventfd, vhost, DRM syncobj eventfd, etc. So we're in the clear there. What about `drm_syncobj_eventfd_ioctl`? It's the exact entrypoint function that's been modified! Perfect, that's definitely a target. Can I include `eventfd_ctx_put` as well? Let's check the guidance: "List functions that specifically implement the logic being added or altered, or direct API entrypoints for the subsystem feature under review." Bingo, the patch modifies both `eventfd_ctx_put` and `drm_syncobj_eventfd_ioctl`. So, they both fit the description. These aren't static functions, they were modified, and not ubiquitous. Let's make sure `drm_syncobj_eventfd_ioctl` is non-static: I can see it's exposed via `drm_ioctls` and `eventfd_ctx_put` is `EXPORT_SYMBOL_GPL(eventfd_ctx_put)`. Good. Just to be thorough, I have to check for other changed functions. I see `DEFINE_FREE` in `include/linux/eventfd.h` with `eventfd_ctx_put`. This is defining a cleanup function such as `free_eventfd` or `class_eventfd_destructor`. I need to understand exactly how `DEFINE_FREE` is used. I'll check `include/linux/cleanup.h`.
32/2	2026/09/15 14:40	tool	grepper	0m Args: { "Expression": "#define DEFINE_FREE" } Results: { "Output": "fs/xfs/xfs_trace.h=3115=DECLARE_EVENT_CLASS(xfs_free_extent_deferred_class,\n--\nfs/xfs/xfs_trace.h-3142-);\nfs/xfs/xfs_trace.h:3143:#define DEFINE_FREE_EXTENT_DEFERRED_EVENT(name) \\\nfs/xfs/xfs_trace.h-3144-DEFINE_EVENT(xfs_free_extent_deferred_class, name, \\\n--\nfs/xfs/xfs_trace.h=5897=DECLARE_EVENT_CLASS(xfs_freeblocks_resv_class,\n--\nfs/xfs/xfs_trace.h-5924-)\nfs/xfs/xfs_trace.h:5925:#define DEFINE_FREEBLOCKS_RESV_EVENT(name) \\\nfs/xfs/xfs_trace.h-5926-DEFINE_EVENT(xfs_freeblocks_resv_class, name, \\\n--\ninclude/linux/cleanup.h-209-\ninclude/linux/cleanup.h:210:#define DEFINE_FREE(_name, _type, _free) \\\ninclude/linux/cleanup.h-211-\tstatic __always_inline void __free_##_name(void p) { _type _T = (_type *)p; _free; }\n--\ninclude/trace/events/dma.h=206=DECLARE_EVENT_CLASS(dma_free_class,\n--\ninclude/trace/events/dma.h-237-\ninclude/trace/events/dma.h:238:#define DEFINE_FREE_EVENT(name) \\\ninclude/trace/events/dma.h-239-DEFINE_EVENT(dma_free_class, name, \\\n" }
33/2	2026/09/15 14:40	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 44932 output: 207 thoughts: 851 Thoughts: Analysis of the Patch for Fuzzing Suitability Okay, let's break this down for fuzzing purposes. The core of this patch involves `DEFINE_FREE`, which expands to a static inline function, meaning it's not a standalone symbol in vmlinux. Crucially, the caller in this specific instance is `drm_syncobj_eventfd_ioctl`. First, we need to determine if it's worth fuzzing. The patch touches reachable, executable code, so that is our criteria. The stated goals for patch fuzzing are to find bugs, regressions, and such. The primary hurdle is reachability. This code is indeed reachable. We should never blindly trust claims of "no functional change" or refactoring; let's dig deeper. This patch modifies code in `fs/eventfd.c` (VFS/syscall level) and `drivers/gpu/drm/drm_syncobj.c` (DRM syncobj ioctl). The `eventfd_ctx_put()` function has been modified to handle `IS_ERR_OR_NULL(ctx)`, which could expose potential NULL pointer dereference or error handling issues, or memory issues in the case the cleanup isn't handled correctly. The DRM syncobj ioctl is reachable via DRM devices supporting syncobj timelines, specifically virtio-gpu in QEMU. This refactoring uses a cleanup.h RAII, specifically `__free(eventfd)`. It's a combination of a core subsystem (eventfd) and a reachable driver framework (DRM syncobj / virtio-gpu). Since the code is reachable executable code, we consider it to be worth fuzzing. Next, we check the necessary configuration options. We need `EVENTFD` to enable the `fs/eventfd.c` code, `DRM` to enable the DRM subsystem, and `DRM_VIRTIO_GPU` which allows the `drm_syncobj_eventfd_ioctl` function to be exercised through virtio-gpu in QEMU. These are all boolean configs, defined appropriately in the kernel's Kconfig files. The key symbols to focus on are `drm_syncobj_eventfd_ioctl` and `eventfd_ctx_put`. These are the only two C functions directly touched by the changes. Therefore, the parameters for `set-results` should be: * `EnableConfigs`: `["DRM", "DRM_VIRTIO_GPU", "EVENTFD"]` * `FocusSymbols`: `["drm_syncobj_eventfd_ioctl", "eventfd_ctx_put"]` * `Reasoning`: This patch modifies reachable executable code in both a core filesystem component (eventfd) and a driver framework (DRM syncobj), specifically through the virtio-gpu driver within QEMU. This is a refactoring, introducing RAII cleanup which handles the `__free` logic to the eventfd, which could expose errors due to incorrectly handled null or error conditions or memory corruption. * `WorthFuzzing`: `true` Alright, that covers all the bases. I think we're ready to call `set-results`.
34/2	2026/09/15 14:40	tool	set-results	0m Args: { "EnableConfigs": [ "DRM", "DRM_VIRTIO_GPU", "EVENTFD" ], "FocusSymbols": [ "drm_syncobj_eventfd_ioctl", "eventfd_ctx_put" ], "Reasoning": "The patch updates eventfd_ctx_put() in fs/eventfd.c to safely handle IS_ERR_OR_NULL pointers and introduces the DEFINE_FREE(eventfd, ...) scoped cleanup helper, which is then used to refactor resource release and error paths in drm_syncobj_eventfd_ioctl(). The modified code is executable and fully reachable from userspace via virtio-gpu in standard QEMU environments (which supports DRIVER_SYNCOBJ_TIMELINE). Fuzzing is warranted to verify that the cleanup attribute handling and new NULL/ERR checks do not introduce reference leaks, double puts, or other regressions under error paths.", "WorthFuzzing": true } Results: { "EnableConfigs": [ "DRM", "DRM_VIRTIO_GPU", "EVENTFD" ], "FocusSymbols": [ "drm_syncobj_eventfd_ioctl", "eventfd_ctx_put" ], "Reasoning": "The patch updates eventfd_ctx_put() in fs/eventfd.c to safely handle IS_ERR_OR_NULL pointers and introduces the DEFINE_FREE(eventfd, ...) scoped cleanup helper, which is then used to refactor resource release and error paths in drm_syncobj_eventfd_ioctl(). The modified code is executable and fully reachable from userspace via virtio-gpu in standard QEMU environments (which supports DRIVER_SYNCOBJ_TIMELINE). Fuzzing is warranted to verify that the cleanup attribute handling and new NULL/ERR checks do not introduce reference leaks, double puts, or other regressions under error paths.", "WorthFuzzing": true }
35/1	2026/09/15 14:40	action	If	8m Args: { "WorthFuzzing": true } Results: null
36/2	2026/09/15 14:40	agent	kmsan-evaluator	8m Model: core Args: null Results: { "KMSANReasoning": "The patch introduces a `__free(eventfd)` cleanup helper using the `DEFINE_FREE` macro and refactors `drm_syncobj_eventfd_ioctl()` to use automatic resource management (`__free` and `no_free_ptr`) for `struct eventfd_ctx`. Additionally, `eventfd_ctx_put()` is updated to safely handle `NULL` or error pointers via `IS_ERR_OR_NULL(ctx)`.\n\nThese changes concern pointer lifetime and resource deallocation. The local pointer `ev_fd_ctx` is explicitly initialized to `NULL`, and the heap allocation `entry` continues to be zero-allocated via `kzalloc_obj()`. No uninitialized memory, padding bytes, or user-space copies are introduced or altered. Any potential bugs would relate to reference counting, resource leaks, or pointer cleanup, which fall under standard KASAN/refcount tracking rather than KMSAN uninitialized memory detection. Therefore, a dedicated KMSAN fuzzing session is not warranted.", "NeedsKMSAN": false } Instruction: You are an expert Linux kernel security engineer specializing in kernel memory error detectors (KASAN and KMSAN). Your job is to review the provided patch series and determine if the code changes justify spawning a dedicated KMSAN (KernelMemorySanitizer) fuzzing session in addition to standard KASAN fuzzing. CRITICAL DISTINCTION BETWEEN KASAN AND KMSAN: - Standard KASAN kernel builds (upstream-apparmor-kasan.config) already enable a comprehensive suite of debugging tools and sanitizers, including KASAN (out-of-bounds accesses, use-after-free, double free, invalid free), LOCKDEP (locking bugs and deadlocks), UB-sanitizers, and memory corruption checks. - KMSAN (KernelMemorySanitizer) detects reads of UNINITIALIZED memory (stack, heap, or page allocations) and kernel-to-user memory info-leaks. Rule: THERE IS NO SENSE IN RUNNING A KMSAN SESSION IF A BUG CAN BE CAUGHT BY KASAN, LOCKDEP, OR OTHER STANDARD BUG DETECTORS. A dedicated KMSAN fuzzing session incurs significant resource costs. You must ONLY set NeedsKMSAN=true if the code changes introduce or expose UNINITIALIZED MEMORY risks that are detected ONLY by KMSAN. Look holistically at the patch series and surrounding code. Even if no direct uninitialized field accesses or new buffer allocations are added in the diff itself, a patch may alter control flow, bounds checking, or data length calculations in ways that change how the rest of the code operates on existing buffers (e.g. allowing uninitialized stack/heap memory to be read, copied to user space, or used in control flow). Do not hesitate to use your code access tools to inspect the surrounding code, called functions, and callers. Set NeedsKMSAN=true ONLY IF the patch introduces or modifies: 1. Kernel structures sent to user space (via copy_to_user, put_user, netlink skb attributes, ioctl output arguments, socket options, or BPF buffers) where fields or structure padding might not be fully initialized/zeroed. 2. Conditional logic or branching that depends on potentially uninitialized variables or struct fields. 3. Allocation or initialization of complex data structures where uninitialized fields could be read later in reachable code paths. 4. Bounds checks, lengths, or logic in a way that allows surrounding code to access uninitialized bytes of existing buffers. Set NeedsKMSAN=false IF: - The code changes primarily risk out-of-bounds access, array overflows, NULL pointer dereferences, locking deadlocks, or use-after-free bugs (these are already caught by KASAN, LOCKDEP, or standard bug detectors). - All stack/heap structures touched or introduced by the patch are fully zeroed or initialized (e.g. using = {0}, memset, kzalloc) before being read or copied. - The patch does not introduce any risk of uninitialized memory usage or info-leaks. Use your code access tools to inspect the surrounding code if necessary, then provide detailed KMSANReasoning contrasting KASAN vs KMSAN applicability for this patch. Prefer calling several tools at the same time to save round-trips. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: Target architecture: amd64 For your convenience, here is the diff of the changes: commit c5df43be3ebc21de489c5599cca83bfbb4cd878c Author: syz-cluster <triage@syzkaller.com> Date: Tue Sep 15 14:23:02 2026 +0000 syz-cluster: applied patch under review diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c index c23a5de27effa..efc4e8af220c8 100644 --- a/drivers/gpu/drm/drm_syncobj.c +++ b/drivers/gpu/drm/drm_syncobj.c @@ -1462,9 +1462,9 @@ int drm_syncobj_eventfd_ioctl(struct drm_device dev, void data, struct drm_file file_private) { + struct eventfd_ctx ev_fd_ctx __free(eventfd) = NULL; struct drm_syncobj_eventfd args = data; struct drm_syncobj syncobj; - struct eventfd_ctx ev_fd_ctx; struct syncobj_eventfd_entry entry; int ret; @@ -1490,10 +1490,10 @@ drm_syncobj_eventfd_ioctl(struct drm_device dev, void data, entry = kzalloc_obj(entry); if (!entry) { ret = -ENOMEM; - goto err_kzalloc; + goto err_fdget; } entry->syncobj = syncobj; - entry->ev_fd_ctx = ev_fd_ctx; + entry->ev_fd_ctx = no_free_ptr(ev_fd_ctx); entry->point = args->point; entry->flags = args->flags; @@ -1502,8 +1502,6 @@ drm_syncobj_eventfd_ioctl(struct drm_device dev, void data, return 0; -err_kzalloc: - eventfd_ctx_put(ev_fd_ctx); err_fdget: drm_syncobj_put(syncobj); return ret; diff --git a/fs/eventfd.c b/fs/eventfd.c index 9d33a02757d52..1cd1741b81b17 100644 --- a/fs/eventfd.c +++ b/fs/eventfd.c @@ -102,6 +102,9 @@ static void eventfd_free(struct kref kref) / void eventfd_ctx_put(struct eventfd_ctx ctx) { + if (IS_ERR_OR_NULL(ctx)) + return; + kref_put(&ctx->kref, eventfd_free); } EXPORT_SYMBOL_GPL(eventfd_ctx_put); diff --git a/include/linux/eventfd.h b/include/linux/eventfd.h index e32bee4345fb9..689358c2b0ae7 100644 --- a/include/linux/eventfd.h +++ b/include/linux/eventfd.h @@ -10,6 +10,7 @@ #define _LINUX_EVENTFD_H #include <linux/wait.h> +#include <linux/cleanup.h> #include <linux/err.h> #include <linux/percpu-defs.h> #include <linux/percpu.h> @@ -89,5 +90,7 @@ static inline void eventfd_signal(struct eventfd_ctx ctx) eventfd_signal_mask(ctx, 0); } +DEFINE_FREE(eventfd, struct eventfd_ctx , eventfd_ctx_put(_T)) + #endif /* _LINUX_EVENTFD_H */
37/3	2026/09/15 14:40	llm	kmsan-evaluator	8m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 2804 output: 41 thoughts: 997 Thoughts: Analyzing the `drm_syncobj_eventfd_ioctl` Patch Okay, let's dive into this patch. I see changes to `drivers/gpu/drm/drm_syncobj.c`, `fs/eventfd.c`, and `include/linux/eventfd.h`. My initial thought is that this is likely related to handling event file descriptors in the context of DRM sync objects. I'll need to parse the diff to ascertain the specifics. First thing I notice in `drm_syncobj_eventfd_ioctl` is a new local variable declaration: `struct eventfd_ctx *ev_fd_ctx __free(eventfd) = NULL;`. Ah, they're using a cleanup handler, `__free(eventfd)`. This is interesting; they're associating the `eventfd_ctx_put` function with the variable, and the cleanup will be triggered when the variable goes out of scope, or when `no_free_ptr()` is called on it. Previously, `ev_fd_ctx` was declared and initialized separately, and the function's error handling used `eventfd_ctx_put` when an error occurred, likely to free the eventfd context. This pattern is fairly common, so it's a good place to start. Now, it seems like the cleanup is integrated, making the code more robust and potentially simpler. Further down, the code now uses `no_free_ptr(ev_fd_ctx)` when assigning it to `entry->ev_fd_ctx`. This is crucial. It prevents the cleanup handler from running when `entry->ev_fd_ctx` goes out of scope, because the eventfd context is now managed elsewhere. The change in `fs/eventfd.c` adds a check to `eventfd_ctx_put` for a `NULL` or `ERR_PTR` pointer, which makes sense as it allows handling of cases where the context wasn't properly initialized. I'll need to remember that. Finally, the `include/linux/eventfd.h` change adds a `DEFINE_FREE` macro for `eventfd`, which clearly associates the `eventfd_ctx_put` function with the `eventfd_ctx` struct for use with the `__free` attribute. This is the core of the cleanup mechanism and provides a cleaner and safer way to manage the lifetime of the `eventfd_ctx` object. In summary, this patch is refactoring the error handling and resource management of event file descriptors within the `drm_syncobj_eventfd_ioctl` function. It's using cleanup handlers to automatically release the `eventfd_ctx` on scope exit or manual call to `no_free_ptr`, thus reducing the chance of memory leaks and making the code more readable and maintainable. This seems like a positive change that I should definitely take note of.
38/3	2026/09/15 14:49	tool	read-file	0m Args: { "File": "drivers/gpu/drm/drm_syncobj.c", "FirstLine": 1460, "LineCount": 55 } Results: { "Contents": "1460:\t\n1461:\tint\n1462:\tdrm_syncobj_eventfd_ioctl(struct drm_device dev, void data,\n1463:\t\t\t\t struct drm_file file_private)\n1464:\t{\n1465:\t\tstruct eventfd_ctx ev_fd_ctx __free(eventfd) = NULL;\n1466:\t\tstruct drm_syncobj_eventfd args = data;\n1467:\t\tstruct drm_syncobj syncobj;\n1468:\t\tstruct syncobj_eventfd_entry entry;\n1469:\t\tint ret;\n1470:\t\n1471:\t\tif (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))\n1472:\t\t\treturn -EOPNOTSUPP;\n1473:\t\n1474:\t\tif (args-\u003eflags \u0026 ~DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE)\n1475:\t\t\treturn -EINVAL;\n1476:\t\n1477:\t\tif (args-\u003epad)\n1478:\t\t\treturn -EINVAL;\n1479:\t\n1480:\t\tsyncobj = drm_syncobj_find(file_private, args-\u003ehandle);\n1481:\t\tif (!syncobj)\n1482:\t\t\treturn -ENOENT;\n1483:\t\n1484:\t\tev_fd_ctx = eventfd_ctx_fdget(args-\u003efd);\n1485:\t\tif (IS_ERR(ev_fd_ctx)) {\n1486:\t\t\tret = PTR_ERR(ev_fd_ctx);\n1487:\t\t\tgoto err_fdget;\n1488:\t\t}\n1489:\t\n1490:\t\tentry = kzalloc_obj(entry);\n1491:\t\tif (!entry) {\n1492:\t\t\tret = -ENOMEM;\n1493:\t\t\tgoto err_fdget;\n1494:\t\t}\n1495:\t\tentry-\u003esyncobj = syncobj;\n1496:\t\tentry-\u003eev_fd_ctx = no_free_ptr(ev_fd_ctx);\n1497:\t\tentry-\u003epoint = args-\u003epoint;\n1498:\t\tentry-\u003eflags = args-\u003eflags;\n1499:\t\n1500:\t\tdrm_syncobj_add_eventfd(syncobj, entry);\n1501:\t\tdrm_syncobj_put(syncobj);\n1502:\t\n1503:\t\treturn 0;\n1504:\t\n1505:\terr_fdget:\n1506:\t\tdrm_syncobj_put(syncobj);\n1507:\t\treturn ret;\n1508:\t}\n1509:\t\n1510:\tint\n1511:\tdrm_syncobj_reset_ioctl(struct drm_device dev, void data,\n1512:\t\t\t\tstruct drm_file file_private)\n1513:\t{\n1514:\t\tstruct drm_syncobj_array args = data;\n" }
39/3	2026/09/15 14:49	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 5251 output: 236 thoughts: 898 Thoughts: Analyzing the Patch for Uninitialized Memory Risks Okay, let's break this down. First, I see a refactoring centered around resource management, specifically using the `__free` cleanup attribute and the `eventfd_ctx_put` function. It's designed to handle resource lifetime and prevent potential leaks or use-after-free bugs. The patch seems pretty straightforward: 1. It defines `DEFINE_FREE` for `eventfd` contexts. 2. It updates `eventfd_ctx_put` to safely handle `NULL` or error pointers. This is good practice. 3. In `drm_syncobj_eventfd_ioctl`, we have a `struct eventfd_ctx ev_fd_ctx __free(eventfd) = NULL;` declaration. The ownership gets transferred to `entry` via `no_free_ptr`. Crucially, error paths now safely free `ev_fd_ctx` if it's not `NULL` (or it's an error pointer, which `eventfd_ctx_put` handles). The removal of `err_kzalloc` simplifies the error handling. Now, the question is: does this patch introduce any risks of uninitialized memory usage or kernel information leaks that would warrant KMSAN? Let's go through the checklist carefully: 1. Kernel structures to userspace?* Nope. The input, `void data`, comes from the DRM ioctl framework. No new information is being copied to userspace. 2. Conditional logic based on uninitialized variables?* No again. `ev_fd_ctx` is explicitly initialized to `NULL`. 3. Complex structures with uninitialized fields? `entry` is allocated using `kzalloc_obj`, which zeroes the memory. 4. Bounds checks or logic that exposes uninitialized bytes? No, nothing here. This refactoring is all about resource cleanup and avoiding memory management bugs—specifically use-after-free or double-free, leaks. These are standard memory management issues that KASAN, refcount detectors, or leak detectors would catch. It's not about uninitialized memory reads or information leaks. Given all of this, the criteria outlined are clear: KMSAN is not needed in this case. The patch does not introduce the types of risks that KMSAN is designed to catch. The code changes risk out-of-bounds access, array overflows, NULL pointer dereferences, locking deadlocks, or use-after-free bugs. The structures touched or introduced by the patch are fully zeroed or initialized. The patch does not introduce any risk of uninitialized memory usage or info-leaks. Therefore, `NeedsKMSAN=false`. Let's prepare the call to `set-results`.
40/3	2026/09/15 14:49	tool	set-results	0m Args: { "KMSANReasoning": "The patch introduces a `__free(eventfd)` cleanup helper using the `DEFINE_FREE` macro and refactors `drm_syncobj_eventfd_ioctl()` to use automatic resource management (`__free` and `no_free_ptr`) for `struct eventfd_ctx`. Additionally, `eventfd_ctx_put()` is updated to safely handle `NULL` or error pointers via `IS_ERR_OR_NULL(ctx)`.\n\nThese changes concern pointer lifetime and resource deallocation. The local pointer `ev_fd_ctx` is explicitly initialized to `NULL`, and the heap allocation `entry` continues to be zero-allocated via `kzalloc_obj()`. No uninitialized memory, padding bytes, or user-space copies are introduced or altered. Any potential bugs would relate to reference counting, resource leaks, or pointer cleanup, which fall under standard KASAN/refcount tracking rather than KMSAN uninitialized memory detection. Therefore, a dedicated KMSAN fuzzing session is not warranted.", "NeedsKMSAN": false } Results: { "KMSANReasoning": "The patch introduces a `__free(eventfd)` cleanup helper using the `DEFINE_FREE` macro and refactors `drm_syncobj_eventfd_ioctl()` to use automatic resource management (`__free` and `no_free_ptr`) for `struct eventfd_ctx`. Additionally, `eventfd_ctx_put()` is updated to safely handle `NULL` or error pointers via `IS_ERR_OR_NULL(ctx)`.\n\nThese changes concern pointer lifetime and resource deallocation. The local pointer `ev_fd_ctx` is explicitly initialized to `NULL`, and the heap allocation `entry` continues to be zero-allocated via `kzalloc_obj()`. No uninitialized memory, padding bytes, or user-space copies are introduced or altered. Any potential bugs would relate to reference counting, resource leaks, or pointer cleanup, which fall under standard KASAN/refcount tracking rather than KMSAN uninitialized memory detection. Therefore, a dedicated KMSAN fuzzing session is not warranted.", "NeedsKMSAN": false }

{
  "EnableConfigs": [
    "DRM",
    "DRM_VIRTIO_GPU",
    "EVENTFD"
  ],
  "FocusSymbols": [
    "drm_syncobj_eventfd_ioctl",
    "eventfd_ctx_put"
  ],
  "KMSANReasoning": "The patch introduces a `__free(eventfd)` cleanup helper using the `DEFINE_FREE` macro and refactors `drm_syncobj_eventfd_ioctl()` to use automatic resource management (`__free` and `no_free_ptr`) for `struct eventfd_ctx`. Additionally, `eventfd_ctx_put()` is updated to safely handle `NULL` or error pointers via `IS_ERR_OR_NULL(ctx)`.\n\nThese changes concern pointer lifetime and resource deallocation. The local pointer `ev_fd_ctx` is explicitly initialized to `NULL`, and the heap allocation `entry` continues to be zero-allocated via `kzalloc_obj()`. No uninitialized memory, padding bytes, or user-space copies are introduced or altered. Any potential bugs would relate to reference counting, resource leaks, or pointer cleanup, which fall under standard KASAN/refcount tracking rather than KMSAN uninitialized memory detection. Therefore, a dedicated KMSAN fuzzing session is not warranted.",
  "NeedsKMSAN": false,
  "Reasoning": "The patch updates eventfd_ctx_put() in fs/eventfd.c to safely handle IS_ERR_OR_NULL pointers and introduces the DEFINE_FREE(eventfd, ...) scoped cleanup helper, which is then used to refactor resource release and error paths in drm_syncobj_eventfd_ioctl(). The modified code is executable and fully reachable from userspace via virtio-gpu in standard QEMU environments (which supports DRIVER_SYNCOBJ_TIMELINE). Fuzzing is warranted to verify that the cleanup attribute handling and new NULL/ERR checks do not introduce reference leaks, double puts, or other regressions under error paths.",
  "WorthFuzzing": true
}

{
  "PatchDiff": "commit c5df43be3ebc21de489c5599cca83bfbb4cd878c\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Tue Sep 15 14:23:02 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c\nindex c23a5de27effa..efc4e8af220c8 100644\n--- a/drivers/gpu/drm/drm_syncobj.c\n+++ b/drivers/gpu/drm/drm_syncobj.c\n@@ -1462,9 +1462,9 @@ int\n drm_syncobj_eventfd_ioctl(struct drm_device *dev, void *data,\n \t\t\t  struct drm_file *file_private)\n {\n+\tstruct eventfd_ctx *ev_fd_ctx __free(eventfd) = NULL;\n \tstruct drm_syncobj_eventfd *args = data;\n \tstruct drm_syncobj *syncobj;\n-\tstruct eventfd_ctx *ev_fd_ctx;\n \tstruct syncobj_eventfd_entry *entry;\n \tint ret;\n \n@@ -1490,10 +1490,10 @@ drm_syncobj_eventfd_ioctl(struct drm_device *dev, void *data,\n \tentry = kzalloc_obj(*entry);\n \tif (!entry) {\n \t\tret = -ENOMEM;\n-\t\tgoto err_kzalloc;\n+\t\tgoto err_fdget;\n \t}\n \tentry-\u003esyncobj = syncobj;\n-\tentry-\u003eev_fd_ctx = ev_fd_ctx;\n+\tentry-\u003eev_fd_ctx = no_free_ptr(ev_fd_ctx);\n \tentry-\u003epoint = args-\u003epoint;\n \tentry-\u003eflags = args-\u003eflags;\n \n@@ -1502,8 +1502,6 @@ drm_syncobj_eventfd_ioctl(struct drm_device *dev, void *data,\n \n \treturn 0;\n \n-err_kzalloc:\n-\teventfd_ctx_put(ev_fd_ctx);\n err_fdget:\n \tdrm_syncobj_put(syncobj);\n \treturn ret;\ndiff --git a/fs/eventfd.c b/fs/eventfd.c\nindex 9d33a02757d52..1cd1741b81b17 100644\n--- a/fs/eventfd.c\n+++ b/fs/eventfd.c\n@@ -102,6 +102,9 @@ static void eventfd_free(struct kref *kref)\n  */\n void eventfd_ctx_put(struct eventfd_ctx *ctx)\n {\n+\tif (IS_ERR_OR_NULL(ctx))\n+\t\treturn;\n+\n \tkref_put(\u0026ctx-\u003ekref, eventfd_free);\n }\n EXPORT_SYMBOL_GPL(eventfd_ctx_put);\ndiff --git a/include/linux/eventfd.h b/include/linux/eventfd.h\nindex e32bee4345fb9..689358c2b0ae7 100644\n--- a/include/linux/eventfd.h\n+++ b/include/linux/eventfd.h\n@@ -10,6 +10,7 @@\n #define _LINUX_EVENTFD_H\n \n #include \u003clinux/wait.h\u003e\n+#include \u003clinux/cleanup.h\u003e\n #include \u003clinux/err.h\u003e\n #include \u003clinux/percpu-defs.h\u003e\n #include \u003clinux/percpu.h\u003e\n@@ -89,5 +90,7 @@ static inline void eventfd_signal(struct eventfd_ctx *ctx)\n \teventfd_signal_mask(ctx, 0);\n }\n \n+DEFINE_FREE(eventfd, struct eventfd_ctx *, eventfd_ctx_put(_T))\n+\n #endif /* _LINUX_EVENTFD_H */\n \n"
}

{
  "EnableConfigs": [
    "DRM",
    "DRM_VIRTIO_GPU",
    "EVENTFD"
  ],
  "FocusSymbols": [
    "drm_syncobj_eventfd_ioctl",
    "eventfd_ctx_put"
  ],
  "Reasoning": "The patch updates eventfd_ctx_put() in fs/eventfd.c to safely handle IS_ERR_OR_NULL pointers and introduces the DEFINE_FREE(eventfd, ...) scoped cleanup helper, which is then used to refactor resource release and error paths in drm_syncobj_eventfd_ioctl(). The modified code is executable and fully reachable from userspace via virtio-gpu in standard QEMU environments (which supports DRIVER_SYNCOBJ_TIMELINE). Fuzzing is warranted to verify that the cleanup attribute handling and new NULL/ERR checks do not introduce reference leaks, double puts, or other regressions under error paths.",
  "WorthFuzzing": true
}

You are an expert Linux kernel maintainer and security engineer.
Your job is to review a provided patch series and evaluate whether it warrants fuzzing with syzkaller.

IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on internal assumptions. You must actively use your code access
tools to inspect the actual source code, callers, and surrounding context.

================================================================================
1. CORE TRIAGE PHILOSOPHY
================================================================================
The goal of patch fuzzing is to discover crashes, regressions, exposed latent bugs,
and newly triggered assertions introduced by the patch series.

- REACHABILITY IS THE PRIMARY GATE:
  Fuzzing can only discover bugs in code that can actually execute in standard virtualized
  environments (GCE or QEMU, utilizing software-emulated devices like USB gadgets, netdev, tun/tap).
  If the modified code is structurally unreachable (see Section 2), it MUST NOT be fuzzed,
  regardless of whether it adds assertions or complex logic.

- DO NOT BLINDLY TRUST "NO FUNCTIONAL CHANGE" (NFCI) OR "REFACTORING" CLAIMS:
  Patch authors routinely label changes as "cleanups", "refactorings", or state
  "No functional change intended". Do NOT take these claims at face value.
  Code refactorings that rearrange logic, introduce helper functions, or alter state management
  in core subsystems frequently introduce subtle semantic shifts or uncover latent kernel bugs.
  If reachable executable code is modified or refactored, it MUST be fuzzed.

- NEW OR MODIFIED ASSERTIONS IN REACHABLE CODE MUST BE FUZZED:
  When a patch introduces or modifies runtime checks or assertions (e.g., WARN_ON*, VM_WARN_ON*,
  BUG_ON*, lockdep_assert*) in reachable code paths, it enforces new or stricter invariants.
  Even if the author believes the invariant always holds, fuzzing is essential to verify whether
  an unusual sequence of operations can violate it.

================================================================================
2. WHEN TO RETURN WorthFuzzing=false (NEGATIVE CRITERIA)
================================================================================
Return WorthFuzzing=false ONLY IF all modified code falls strictly into one or more of these categories:

- Non-kernel and non-executable changes:
  * Modifications to Documentation/, comments, or spelling fixes.
  * User-space directories, self-tests, samples, or scripts (e.g., tools/, samples/, scripts/, usr/)
    that do not affect the compiled kernel image (vmlinux) or kernel modules.
  * Purely decorative logging (e.g., message strings in pr_err, printk, dev_info) or tracepoints
    that do not alter control flow or data structures.
  * Build system or Kconfig changes that do not alter compiled C logic.
- Structurally unreachable hardware:
  * Vendor-specific PCIe switches, SmartNICs, or GPU drivers (e.g., mlxsw, pds_core, qed,
    ionic, amdgpu) requiring physical ASIC/PCIe cards not emulated in standard QEMU.
- Unreachable execution paths:
  * Driver teardown callbacks (.remove, .shutdown, pci_unregister_driver) executed only during
    physical PCI hot-unplug or manual sysfs driver unbinding.
  * Code paths exclusive to architectures other than the target architecture.

================================================================================
3. WHEN TO RETURN WorthFuzzing=true (POSITIVE CRITERIA)
================================================================================
Return WorthFuzzing=true whenever the patch touches reachable executable code, including:
- Core Subsystems:
  * Any logic modifications in memory management (mm/), synchronization/locking (kernel/locking/),
    BPF, scheduler, core networking, VFS, or syscall handling.
- Refactorings and Code Cleanups:
  * Any restructuring of reachable data structures, helper abstractions, or algorithm flows.
- Runtime Assertions and Defensive Checks:
  * Any introduction or alteration of assertions (WARN_ON*, VM_WARN_ON*, BUG_ON*, etc.) in reachable paths.
- Reachable Drivers and Protocols:
  * Drivers accessible via virtual buses (virtio, USB gadget, loopback, netlink, binder, sockets, etc.).

================================================================================
4. EXTRACTING FocusSymbols (PREVENTING DILUTION)
================================================================================
When WorthFuzzing=true, you must extract specific kernel functions into FocusSymbols to guide the fuzzer:

- AVOID UBIQUITOUS LIFECYCLE HOT-PATHS:
  Do NOT list generic, ubiquitous functions called by almost every program in the corpus
  (including, but not limited to: general memory allocators and deallocators, page fault
  and trap handlers, or core synchronization primitives; this is not an exhaustive list).
  Listing ubiquitous functions causes the fuzzer to classify thousands of unrelated tests as "focused",
  which severely dilutes fuzzing effort away from the actual changes.

- TARGET SPECIFIC FEATURE LOGIC AND ENTRYPOINTS:
  List functions that specifically implement the logic being added or altered, or direct API entrypoints
  for the subsystem feature under review.

- HANDLING STATIC INLINE FUNCTIONS IN HEADERS (.h):
  Compiler-inlined static functions (such as static inlines in mm/*.h or include/linux/*.h) lack
  distinct symbol addresses in vmlinux and cannot be targeted directly by symbol coverage filters.
  If the changes are primarily in static inline helpers, identify non-static, feature-specific caller
  functions in .c files that exercise them (avoiding ubiquitous lifecycle wrappers).

================================================================================
5. IDENTIFYING EnableConfigs
================================================================================
Identify any specific CONFIG_ options required to properly compile and reach the modified code:
- Inspect Kconfig files and #ifdef guards; do not make assumptions.
- Check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed.
- Strip any 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4").
Prefer calling several tools at the same time to save round-trips.


Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.

Target architecture: amd64

For your convenience, here is the diff of the changes:
commit c5df43be3ebc21de489c5599cca83bfbb4cd878c
Author: syz-cluster <triage@syzkaller.com>
Date:   Tue Sep 15 14:23:02 2026 +0000

    syz-cluster: applied patch under review

diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
index c23a5de27effa..efc4e8af220c8 100644
--- a/drivers/gpu/drm/drm_syncobj.c
+++ b/drivers/gpu/drm/drm_syncobj.c
@@ -1462,9 +1462,9 @@ int
 drm_syncobj_eventfd_ioctl(struct drm_device *dev, void *data,
 			  struct drm_file *file_private)
 {
+	struct eventfd_ctx *ev_fd_ctx __free(eventfd) = NULL;
 	struct drm_syncobj_eventfd *args = data;
 	struct drm_syncobj *syncobj;
-	struct eventfd_ctx *ev_fd_ctx;
 	struct syncobj_eventfd_entry *entry;
 	int ret;
 
@@ -1490,10 +1490,10 @@ drm_syncobj_eventfd_ioctl(struct drm_device *dev, void *data,
 	entry = kzalloc_obj(*entry);
 	if (!entry) {
 		ret = -ENOMEM;
-		goto err_kzalloc;
+		goto err_fdget;
 	}
 	entry->syncobj = syncobj;
-	entry->ev_fd_ctx = ev_fd_ctx;
+	entry->ev_fd_ctx = no_free_ptr(ev_fd_ctx);
 	entry->point = args->point;
 	entry->flags = args->flags;
 
@@ -1502,8 +1502,6 @@ drm_syncobj_eventfd_ioctl(struct drm_device *dev, void *data,
 
 	return 0;
 
-err_kzalloc:
-	eventfd_ctx_put(ev_fd_ctx);
 err_fdget:
 	drm_syncobj_put(syncobj);
 	return ret;
diff --git a/fs/eventfd.c b/fs/eventfd.c
index 9d33a02757d52..1cd1741b81b17 100644
--- a/fs/eventfd.c
+++ b/fs/eventfd.c
@@ -102,6 +102,9 @@ static void eventfd_free(struct kref *kref)
  */
 void eventfd_ctx_put(struct eventfd_ctx *ctx)
 {
+	if (IS_ERR_OR_NULL(ctx))
+		return;
+
 	kref_put(&ctx->kref, eventfd_free);
 }
 EXPORT_SYMBOL_GPL(eventfd_ctx_put);
diff --git a/include/linux/eventfd.h b/include/linux/eventfd.h
index e32bee4345fb9..689358c2b0ae7 100644
--- a/include/linux/eventfd.h
+++ b/include/linux/eventfd.h
@@ -10,6 +10,7 @@
 #define _LINUX_EVENTFD_H
 
 #include <linux/wait.h>
+#include <linux/cleanup.h>
 #include <linux/err.h>
 #include <linux/percpu-defs.h>
 #include <linux/percpu.h>
@@ -89,5 +90,7 @@ static inline void eventfd_signal(struct eventfd_ctx *ctx)
 	eventfd_signal_mask(ctx, 0);
 }
 
+DEFINE_FREE(eventfd, struct eventfd_ctx *, eventfd_ctx_put(_T))
+
 #endif /* _LINUX_EVENTFD_H */

							input: 3592
							output: 41
							thoughts: 234

**Analyzing this Patch for Eventfd and DRM Syncobjs**

Okay, let's break this down. My initial instinct is to thoroughly examine this patch, starting with a granular look at the code changes. I need to understand the implications of these modifications, particularly within the context of the DRM syncobj subsystem, given my expertise.

First, the patch alters three files. It looks like:

1.  In `fs/eventfd.c`, there's a safety check being added to `eventfd_ctx_put`: `if (IS_ERR_OR_NULL(ctx)) return;`. This immediately suggests a possible null pointer dereference protection. Important, but straightforward.

2.  `include/linux/eventfd.h` is getting a change to the `DEFINE_FREE` macro for `eventfd`, specifically adding `eventfd_ctx_put(_T)`. This means the macro is now responsible for freeing the `eventfd_ctx`. This is significant because the macro is a crucial part of kernel memory management.

3.  Finally, and perhaps the most interesting piece, is the change within `drivers/gpu/drm/drm_syncobj.c`. The `drm_syncobj_eventfd_ioctl` function is the core of this interaction. Here, the patch modifies how `struct eventfd_ctx *ev_fd_ctx` is handled. It seems the code introduces a `__free(eventfd)` attribute and a  `no_free_ptr` function call. Additionally, the old `err_kzalloc` label and corresponding `eventfd_ctx_put` call have been removed. This implies a change in how `eventfd_ctx` is managed and released in the context of the DRM syncobj. I need to dig deeper into the control flow and memory management logic to confirm the details.
I need to keep in mind, I need to check the exact function `drm_syncobj_eventfd_ioctl` and the surrounding code context, this change to see what's really going on. I'll need to know the rationale for the change and identify potential regression issues.

{
  "File": "drivers/gpu/drm/drm_syncobj.c",
  "FirstLine": 1460,
  "LineCount": 60
}

{
  "Contents": "1460:\t\n1461:\tint\n1462:\tdrm_syncobj_eventfd_ioctl(struct drm_device *dev, void *data,\n1463:\t\t\t\t  struct drm_file *file_private)\n1464:\t{\n1465:\t\tstruct eventfd_ctx *ev_fd_ctx __free(eventfd) = NULL;\n1466:\t\tstruct drm_syncobj_eventfd *args = data;\n1467:\t\tstruct drm_syncobj *syncobj;\n1468:\t\tstruct syncobj_eventfd_entry *entry;\n1469:\t\tint ret;\n1470:\t\n1471:\t\tif (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))\n1472:\t\t\treturn -EOPNOTSUPP;\n1473:\t\n1474:\t\tif (args-\u003eflags \u0026 ~DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE)\n1475:\t\t\treturn -EINVAL;\n1476:\t\n1477:\t\tif (args-\u003epad)\n1478:\t\t\treturn -EINVAL;\n1479:\t\n1480:\t\tsyncobj = drm_syncobj_find(file_private, args-\u003ehandle);\n1481:\t\tif (!syncobj)\n1482:\t\t\treturn -ENOENT;\n1483:\t\n1484:\t\tev_fd_ctx = eventfd_ctx_fdget(args-\u003efd);\n1485:\t\tif (IS_ERR(ev_fd_ctx)) {\n1486:\t\t\tret = PTR_ERR(ev_fd_ctx);\n1487:\t\t\tgoto err_fdget;\n1488:\t\t}\n1489:\t\n1490:\t\tentry = kzalloc_obj(*entry);\n1491:\t\tif (!entry) {\n1492:\t\t\tret = -ENOMEM;\n1493:\t\t\tgoto err_fdget;\n1494:\t\t}\n1495:\t\tentry-\u003esyncobj = syncobj;\n1496:\t\tentry-\u003eev_fd_ctx = no_free_ptr(ev_fd_ctx);\n1497:\t\tentry-\u003epoint = args-\u003epoint;\n1498:\t\tentry-\u003eflags = args-\u003eflags;\n1499:\t\n1500:\t\tdrm_syncobj_add_eventfd(syncobj, entry);\n1501:\t\tdrm_syncobj_put(syncobj);\n1502:\t\n1503:\t\treturn 0;\n1504:\t\n1505:\terr_fdget:\n1506:\t\tdrm_syncobj_put(syncobj);\n1507:\t\treturn ret;\n1508:\t}\n1509:\t\n1510:\tint\n1511:\tdrm_syncobj_reset_ioctl(struct drm_device *dev, void *data,\n1512:\t\t\t\tstruct drm_file *file_private)\n1513:\t{\n1514:\t\tstruct drm_syncobj_array *args = data;\n1515:\t\tstruct drm_syncobj **syncobjs;\n1516:\t\tuint32_t i;\n1517:\t\tint ret;\n1518:\t\n1519:\t\tif (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))\n"
}

							input: 5183
							output: 33
							thoughts: 21

Here's my summary, as if I were thinking these thoughts:

**Examining `fs/eventfd.c`**

Okay, I'm digging into this. I need to understand what's happening with eventfd, so let's zoom in on the `fs/eventfd.c` file. I'll focus my attention around line 100. That's usually a good place to start, given my familiarity with the kernel's architecture. Hopefully, the code there will shed some light on the specific behavior I'm curious about.

{
  "File": "fs/eventfd.c",
  "FirstLine": 95,
  "LineCount": 25
}

{
  "Contents": "  95:\t\n  96:\t/**\n  97:\t * eventfd_ctx_put - Releases a reference to the internal eventfd context.\n  98:\t * @ctx: [in] Pointer to eventfd context.\n  99:\t *\n 100:\t * The eventfd context reference must have been previously acquired either\n 101:\t * with eventfd_ctx_fdget() or eventfd_ctx_fileget().\n 102:\t */\n 103:\tvoid eventfd_ctx_put(struct eventfd_ctx *ctx)\n 104:\t{\n 105:\t\tif (IS_ERR_OR_NULL(ctx))\n 106:\t\t\treturn;\n 107:\t\n 108:\t\tkref_put(\u0026ctx-\u003ekref, eventfd_free);\n 109:\t}\n 110:\tEXPORT_SYMBOL_GPL(eventfd_ctx_put);\n 111:\t\n 112:\tstatic int eventfd_release(struct inode *inode, struct file *file)\n 113:\t{\n 114:\t\tstruct eventfd_ctx *ctx = file-\u003eprivate_data;\n 115:\t\n 116:\t\twake_up_poll(\u0026ctx-\u003ewqh, EPOLLHUP);\n 117:\t\teventfd_ctx_put(ctx);\n 118:\t\treturn 0;\n 119:\t}\n"
}

							input: 5728
							output: 23
							thoughts: 106

**Reachability Analysis: DRM Syncobj in QEMU**

Okay, let's dive into this reachability question. My primary concern is whether `drm_syncobj_eventfd_ioctl` is actually accessible within the QEMU environment. It seems like it should be, considering QEMU supports various DRM devices, specifically things like vgem, virtio-gpu, and vkms. That's a good starting point.

Now, my next logical step is to pinpoint the registration. I need to identify which components are responsible for registering either `DRIVER_SYNCOBJ_TIMELINE` or, more directly, `drm_syncobj_eventfd_ioctl` itself. Knowing the registration point will illuminate the execution path. Time to fire up the grepping tools and hunt for those keywords: `drm_syncobj_eventfd_ioctl` and `DRIVER_SYNCOBJ_TIMELINE`. That should lead me to the relevant drivers or modules.

{
  "Expression": "drm_syncobj_eventfd_ioctl"
}

{
  "Output": "drivers/gpu/drm/drm_internal.h=276=int drm_syncobj_timeline_wait_ioctl(struct drm_device *dev, void *data,\ndrivers/gpu/drm/drm_internal.h-277-\t\t\t\t    struct drm_file *file_private);\ndrivers/gpu/drm/drm_internal.h:278:int drm_syncobj_eventfd_ioctl(struct drm_device *dev, void *data,\ndrivers/gpu/drm/drm_internal.h-279-\t\t\t      struct drm_file *file_private);\n--\ndrivers/gpu/drm/drm_ioctl.c=644=static const struct drm_ioctl_desc drm_ioctls[] = {\n--\ndrivers/gpu/drm/drm_ioctl.c-731-\t\t      DRM_RENDER_ALLOW),\ndrivers/gpu/drm/drm_ioctl.c:732:\tDRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_EVENTFD, drm_syncobj_eventfd_ioctl,\ndrivers/gpu/drm/drm_ioctl.c-733-\t\t      DRM_RENDER_ALLOW),\n--\ndrivers/gpu/drm/drm_syncobj.c=1461=int\ndrivers/gpu/drm/drm_syncobj.c:1462:drm_syncobj_eventfd_ioctl(struct drm_device *dev, void *data,\ndrivers/gpu/drm/drm_syncobj.c-1463-\t\t\t  struct drm_file *file_private)\n"
}

							input: 6435
							output: 22
							thoughts: 85

Here's my summary, as if I were thinking it:

**Digging into DRM Synchronization Objects and EventFD**

Okay, so I'm looking at `DRM_IOCTL_SYNCOBJ_EVENTFD`. This is an ioctl call that operates on the `/dev/dri/card*` or `/dev/dri/renderD*` devices. Straightforward enough. The interesting part is that Syzkaller, that fuzzing beast, *directly* supports `drm_syncobj` and this specific `DRM_IOCTL_SYNCOBJ_EVENTFD` call. That's a good starting point for deeper investigation; Syzkaller's coverage usually highlights areas of potential complexity or vulnerability.

Now, I need to understand the scope and implications of this. Let's start by checking `DRIVER_SYNCOBJ_TIMELINE`. I need to figure out which drivers actually *use* this capability. Identifying which drivers have enabled that specific feature will help me narrow down the potential attack surface and understand the implementation strategies in use. Knowing the drivers involved will allow me to target my analysis more effectively.

{
  "Expression": "DRIVER_SYNCOBJ_TIMELINE"
}

{
  "Output": "drivers/accel/amdxdna/amdxdna_pci_drv.c=329=const struct drm_driver amdxdna_drm_drv = {\ndrivers/accel/amdxdna/amdxdna_pci_drv.c-330-\t.driver_features = DRIVER_GEM | DRIVER_COMPUTE_ACCEL |\ndrivers/accel/amdxdna/amdxdna_pci_drv.c:331:\t\tDRIVER_SYNCOBJ | DRIVER_SYNCOBJ_TIMELINE,\ndrivers/accel/amdxdna/amdxdna_pci_drv.c-332-\t.fops = \u0026amdxdna_fops,\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_drv.c=3110=static const struct drm_driver amdgpu_kms_driver = {\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_drv.c-3114-\t    DRIVER_RENDER | DRIVER_MODESET | DRIVER_SYNCOBJ |\ndrivers/gpu/drm/amd/amdgpu/amdgpu_drv.c:3115:\t    DRIVER_SYNCOBJ_TIMELINE,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_drv.c-3116-\t.open = amdgpu_driver_open_kms,\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_drv.c=3138=const struct drm_driver amdgpu_partition_driver = {\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_drv.c-3140-\t    DRIVER_GEM | DRIVER_RENDER | DRIVER_SYNCOBJ |\ndrivers/gpu/drm/amd/amdgpu/amdgpu_drv.c:3141:\t    DRIVER_SYNCOBJ_TIMELINE,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_drv.c-3142-\t.open = amdgpu_driver_open_kms,\n--\ndrivers/gpu/drm/drm_ioctl.c=234=static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)\n--\ndrivers/gpu/drm/drm_ioctl.c-252-\tcase DRM_CAP_SYNCOBJ_TIMELINE:\ndrivers/gpu/drm/drm_ioctl.c:253:\t\treq-\u003evalue = drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE);\ndrivers/gpu/drm/drm_ioctl.c-254-\t\treturn 0;\n--\ndrivers/gpu/drm/drm_syncobj.c=984=drm_syncobj_transfer_ioctl(struct drm_device *dev, void *data,\n--\ndrivers/gpu/drm/drm_syncobj.c-989-\ndrivers/gpu/drm/drm_syncobj.c:990:\tif (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))\ndrivers/gpu/drm/drm_syncobj.c-991-\t\treturn -EOPNOTSUPP;\n--\ndrivers/gpu/drm/drm_syncobj.c=1366=drm_syncobj_timeline_wait_ioctl(struct drm_device *dev, void *data,\n--\ndrivers/gpu/drm/drm_syncobj.c-1374-\ndrivers/gpu/drm/drm_syncobj.c:1375:\tif (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))\ndrivers/gpu/drm/drm_syncobj.c-1376-\t\treturn -EOPNOTSUPP;\n--\ndrivers/gpu/drm/drm_syncobj.c=1462=drm_syncobj_eventfd_ioctl(struct drm_device *dev, void *data,\n--\ndrivers/gpu/drm/drm_syncobj.c-1470-\ndrivers/gpu/drm/drm_syncobj.c:1471:\tif (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))\ndrivers/gpu/drm/drm_syncobj.c-1472-\t\treturn -EOPNOTSUPP;\n--\ndrivers/gpu/drm/drm_syncobj.c=1580=drm_syncobj_timeline_signal_ioctl(struct drm_device *dev, void *data,\n--\ndrivers/gpu/drm/drm_syncobj.c-1589-\ndrivers/gpu/drm/drm_syncobj.c:1590:\tif (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))\ndrivers/gpu/drm/drm_syncobj.c-1591-\t\treturn -EOPNOTSUPP;\n--\ndrivers/gpu/drm/drm_syncobj.c=1652=int drm_syncobj_query_ioctl(struct drm_device *dev, void *data,\n--\ndrivers/gpu/drm/drm_syncobj.c-1660-\ndrivers/gpu/drm/drm_syncobj.c:1661:\tif (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))\ndrivers/gpu/drm/drm_syncobj.c-1662-\t\treturn -EOPNOTSUPP;\n--\ndrivers/gpu/drm/i915/i915_driver.c=1767=static const struct drm_driver i915_drm_driver = {\n--\ndrivers/gpu/drm/i915/i915_driver.c-1770-\t    DRIVER_RENDER | DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_SYNCOBJ |\ndrivers/gpu/drm/i915/i915_driver.c:1771:\t    DRIVER_SYNCOBJ_TIMELINE,\ndrivers/gpu/drm/i915/i915_driver.c-1772-\t.release = i915_driver_release,\n--\ndrivers/gpu/drm/imagination/pvr_drv.c=1381=static struct drm_driver pvr_drm_driver = {\ndrivers/gpu/drm/imagination/pvr_drv.c-1382-\t.driver_features = DRIVER_GEM | DRIVER_RENDER |\ndrivers/gpu/drm/imagination/pvr_drv.c:1383:\t\t\t   DRIVER_SYNCOBJ | DRIVER_SYNCOBJ_TIMELINE,\ndrivers/gpu/drm/imagination/pvr_drv.c-1384-\t.open = pvr_drm_driver_open,\n--\ndrivers/gpu/drm/msm/msm_drv.c=827=static const struct file_operations fops = {\n--\ndrivers/gpu/drm/msm/msm_drv.c-836-\t\tDRIVER_SYNCOBJ | \\\ndrivers/gpu/drm/msm/msm_drv.c:837:\t\tDRIVER_SYNCOBJ_TIMELINE | \\\ndrivers/gpu/drm/msm/msm_drv.c-838-\t\t0 )\n--\ndrivers/gpu/drm/msm/msm_syncobj.c=10=msm_syncobj_parse_deps(struct drm_device *dev,\n--\ndrivers/gpu/drm/msm/msm_syncobj.c-37-\t\tif (syncobj_desc.point \u0026\u0026\ndrivers/gpu/drm/msm/msm_syncobj.c:38:\t\t    !drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE)) {\ndrivers/gpu/drm/msm/msm_syncobj.c-39-\t\t\tret = UERR(EOPNOTSUPP, dev, \"syncobj timeline unsupported\");\n--\ndrivers/gpu/drm/msm/msm_syncobj.c=86=msm_syncobj_parse_post_deps(struct drm_device *dev,\n--\ndrivers/gpu/drm/msm/msm_syncobj.c-120-\t\t\tif (!drm_core_check_feature(dev,\ndrivers/gpu/drm/msm/msm_syncobj.c:121:\t\t\t                            DRIVER_SYNCOBJ_TIMELINE)) {\ndrivers/gpu/drm/msm/msm_syncobj.c-122-\t\t\t\tret = UERR(EOPNOTSUPP, dev, \"syncobj timeline unsupported\");\n--\ndrivers/gpu/drm/nouveau/nouveau_drm.c=1401=driver_legacy_kms = {\n--\ndrivers/gpu/drm/nouveau/nouveau_drm.c-1403-\t\t\t | DRIVER_SYNCOBJ\ndrivers/gpu/drm/nouveau/nouveau_drm.c:1404:\t\t\t | DRIVER_SYNCOBJ_TIMELINE\ndrivers/gpu/drm/nouveau/nouveau_drm.c-1405-\t\t\t | DRIVER_MODESET\n--\ndrivers/gpu/drm/nouveau/nouveau_drm.c=1411=driver_atomic_kms = {\n--\ndrivers/gpu/drm/nouveau/nouveau_drm.c-1413-\t\t\t | DRIVER_SYNCOBJ\ndrivers/gpu/drm/nouveau/nouveau_drm.c:1414:\t\t\t | DRIVER_SYNCOBJ_TIMELINE\ndrivers/gpu/drm/nouveau/nouveau_drm.c-1415-\t\t\t | DRIVER_MODESET\n--\ndrivers/gpu/drm/panthor/panthor_drv.c=1793=static const struct drm_driver panthor_drm_driver = {\ndrivers/gpu/drm/panthor/panthor_drv.c-1794-\t.driver_features = DRIVER_RENDER | DRIVER_GEM | DRIVER_SYNCOBJ |\ndrivers/gpu/drm/panthor/panthor_drv.c:1795:\t\t\t   DRIVER_SYNCOBJ_TIMELINE,\ndrivers/gpu/drm/panthor/panthor_drv.c-1796-\t.open = panthor_open,\n--\ndrivers/gpu/drm/virtio/virtgpu_drv.c=328=static const struct drm_driver driver = {\n--\ndrivers/gpu/drm/virtio/virtgpu_drv.c-333-\t.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC |\ndrivers/gpu/drm/virtio/virtgpu_drv.c:334:\t\t\t   DRIVER_SYNCOBJ | DRIVER_SYNCOBJ_TIMELINE | DRIVER_CURSOR_HOTSPOT,\ndrivers/gpu/drm/virtio/virtgpu_drv.c-335-\t.open = virtio_gpu_driver_open,\n--\ndrivers/gpu/drm/xe/xe_device.c=396=static const struct drm_driver regular_driver = {\n--\ndrivers/gpu/drm/xe/xe_device.c-400-\t    DRIVER_RENDER | DRIVER_SYNCOBJ |\ndrivers/gpu/drm/xe/xe_device.c:401:\t    DRIVER_SYNCOBJ_TIMELINE,\ndrivers/gpu/drm/xe/xe_device.c-402-\t.open = xe_file_open,\n--\ninclude/drm/drm_drv.h=58=enum drm_driver_feature {\n--\ninclude/drm/drm_drv.h-96-\t/**\ninclude/drm/drm_drv.h:97:\t * @DRIVER_SYNCOBJ_TIMELINE:\ninclude/drm/drm_drv.h-98-\t *\n--\ninclude/drm/drm_drv.h-101-\t */\ninclude/drm/drm_drv.h:102:\tDRIVER_SYNCOBJ_TIMELINE         = BIT(6),\ninclude/drm/drm_drv.h-103-\t/**\n"
}

							input: 9682
							output: 20
							thoughts: 124

**Investigating Eventfd and its Interaction with Virtio-GPU**

Okay, this is interesting. I've spotted something in the kernel source, specifically `drivers/gpu/drm/virtio/virtgpu_drv.c`, that has the `DRIVER_SYNCOBJ | DRIVER_SYNCOBJ_TIMELINE` flag set. Right, Virtio-GPU – that's a key virtual device in QEMU, so that’s directly relevant to my area of expertise. And then I see `eventfd_ctx_put` mentioned. Now, `eventfd.c` is core VFS, that's where the heart of the `eventfd` subsystem lives. That's a good place to start digging deeper.

I need to understand what's calling `eventfd_ctx_put`. The fact that it's related to Virtio-GPU means it could be really important for understanding its synchronization mechanisms. So, let's find out. Time to fire up the grep and get a list of all call sites for `eventfd_ctx_put`. Gotta trace down the execution path here.

{
  "Expression": "eventfd_ctx_put"
}

{
  "Output": "\nFull output is too long, showing 500 out of 516 lines.\nUse more precise expression if possible.\n\narch/x86/kvm/hyperv.c=2725=void kvm_hv_destroy_vm(struct kvm *kvm)\n--\narch/x86/kvm/hyperv.c-2731-\tidr_for_each_entry(\u0026hv-\u003econn_to_evt, eventfd, i)\narch/x86/kvm/hyperv.c:2732:\t\teventfd_ctx_put(eventfd);\narch/x86/kvm/hyperv.c-2733-\tidr_destroy(\u0026hv-\u003econn_to_evt);\n--\narch/x86/kvm/hyperv.c=2736=static int kvm_hv_eventfd_assign(struct kvm *kvm, u32 conn_id, int fd)\n--\narch/x86/kvm/hyperv.c-2755-\t\tret = -EEXIST;\narch/x86/kvm/hyperv.c:2756:\teventfd_ctx_put(eventfd);\narch/x86/kvm/hyperv.c-2757-\treturn ret;\n--\narch/x86/kvm/hyperv.c=2760=static int kvm_hv_eventfd_deassign(struct kvm *kvm, u32 conn_id)\n--\narch/x86/kvm/hyperv.c-2772-\tsynchronize_srcu(\u0026kvm-\u003esrcu);\narch/x86/kvm/hyperv.c:2773:\teventfd_ctx_put(eventfd);\narch/x86/kvm/hyperv.c-2774-\treturn 0;\n--\narch/x86/kvm/xen.c=2134=static int kvm_xen_eventfd_assign(struct kvm *kvm,\n--\narch/x86/kvm/xen.c-2199-\tif (eventfd)\narch/x86/kvm/xen.c:2200:\t\teventfd_ctx_put(eventfd);\narch/x86/kvm/xen.c-2201-out_noeventfd:\n--\narch/x86/kvm/xen.c=2206=static int kvm_xen_eventfd_deassign(struct kvm *kvm, u32 port)\n--\narch/x86/kvm/xen.c-2218-\tif (!evtchnfd-\u003edeliver.port.port)\narch/x86/kvm/xen.c:2219:\t\teventfd_ctx_put(evtchnfd-\u003edeliver.eventfd.ctx);\narch/x86/kvm/xen.c-2220-\tkfree(evtchnfd);\n--\narch/x86/kvm/xen.c=2224=static int kvm_xen_eventfd_reset(struct kvm *kvm)\n--\narch/x86/kvm/xen.c-2257-\t\tif (!evtchnfd-\u003edeliver.port.port)\narch/x86/kvm/xen.c:2258:\t\t\teventfd_ctx_put(evtchnfd-\u003edeliver.eventfd.ctx);\narch/x86/kvm/xen.c-2259-\t\tkfree(evtchnfd);\n--\narch/x86/kvm/xen.c=2356=void kvm_xen_destroy_vm(struct kvm *kvm)\n--\narch/x86/kvm/xen.c-2364-\t\tif (!evtchnfd-\u003edeliver.port.port)\narch/x86/kvm/xen.c:2365:\t\t\teventfd_ctx_put(evtchnfd-\u003edeliver.eventfd.ctx);\narch/x86/kvm/xen.c-2366-\t\tkfree(evtchnfd);\n--\ndrivers/accel/habanalabs/common/device.c=460=static void hpriv_release(struct kref *ref)\n--\ndrivers/accel/habanalabs/common/device.c-536-\tif (hpriv-\u003enotifier_event.eventfd)\ndrivers/accel/habanalabs/common/device.c:537:\t\teventfd_ctx_put(hpriv-\u003enotifier_event.eventfd);\ndrivers/accel/habanalabs/common/device.c-538-\n--\ndrivers/accel/habanalabs/common/habanalabs_ioctl.c=793=static int eventfd_unregister(struct hl_fpriv *hpriv, struct hl_info_args *args)\n--\ndrivers/accel/habanalabs/common/habanalabs_ioctl.c-800-\ndrivers/accel/habanalabs/common/habanalabs_ioctl.c:801:\teventfd_ctx_put(hpriv-\u003enotifier_event.eventfd);\ndrivers/accel/habanalabs/common/habanalabs_ioctl.c-802-\thpriv-\u003enotifier_event.eventfd = NULL;\n--\ndrivers/fpga/dfl.c=1869=static int do_set_irq_trigger(struct dfl_feature *feature, unsigned int idx,\n--\ndrivers/fpga/dfl.c-1880-\t\tkfree(feature-\u003eirq_ctx[idx].name);\ndrivers/fpga/dfl.c:1881:\t\teventfd_ctx_put(feature-\u003eirq_ctx[idx].trigger);\ndrivers/fpga/dfl.c-1882-\t\tfeature-\u003eirq_ctx[idx].trigger = NULL;\n--\ndrivers/fpga/dfl.c-1906-\ndrivers/fpga/dfl.c:1907:\teventfd_ctx_put(trigger);\ndrivers/fpga/dfl.c-1908-free_name:\n--\ndrivers/gpu/drm/drm_syncobj.c=303=syncobj_eventfd_entry_free(struct syncobj_eventfd_entry *entry)\ndrivers/gpu/drm/drm_syncobj.c-304-{\ndrivers/gpu/drm/drm_syncobj.c:305:\teventfd_ctx_put(entry-\u003eev_fd_ctx);\ndrivers/gpu/drm/drm_syncobj.c-306-\tdma_fence_put(entry-\u003efence);\n--\ndrivers/gpu/drm/i915/gvt/kvmgt.c=690=static void intel_vgpu_release_msi_eventfd_ctx(struct intel_vgpu *vgpu)\n--\ndrivers/gpu/drm/i915/gvt/kvmgt.c-695-\tif (trigger) {\ndrivers/gpu/drm/i915/gvt/kvmgt.c:696:\t\teventfd_ctx_put(trigger);\ndrivers/gpu/drm/i915/gvt/kvmgt.c-697-\t\tvgpu-\u003emsi_trigger = NULL;\n--\ndrivers/hv/mshv_eventfd.c=254=static void mshv_irqfd_shutdown(struct work_struct *work)\n--\ndrivers/hv/mshv_eventfd.c-267-\t\tmshv_irqfd_resampler_shutdown(irqfd);\ndrivers/hv/mshv_eventfd.c:268:\t\teventfd_ctx_put(irqfd-\u003eirqfd_resamplefd);\ndrivers/hv/mshv_eventfd.c-269-\t}\n--\ndrivers/hv/mshv_eventfd.c-273-\t */\ndrivers/hv/mshv_eventfd.c:274:\teventfd_ctx_put(irqfd-\u003eirqfd_eventfd_ctx);\ndrivers/hv/mshv_eventfd.c-275-\tkfree(irqfd);\n--\ndrivers/hv/mshv_eventfd.c=393=static int mshv_irqfd_assign(struct mshv_partition *pt,\n--\ndrivers/hv/mshv_eventfd.c-529-\tif (resamplefd \u0026\u0026 !IS_ERR(resamplefd))\ndrivers/hv/mshv_eventfd.c:530:\t\teventfd_ctx_put(resamplefd);\ndrivers/hv/mshv_eventfd.c-531-\ndrivers/hv/mshv_eventfd.c-532-\tif (eventfd \u0026\u0026 !IS_ERR(eventfd))\ndrivers/hv/mshv_eventfd.c:533:\t\teventfd_ctx_put(eventfd);\ndrivers/hv/mshv_eventfd.c-534-\n--\ndrivers/hv/mshv_eventfd.c=543=static int mshv_irqfd_deassign(struct mshv_partition *pt,\n--\ndrivers/hv/mshv_eventfd.c-562-\ndrivers/hv/mshv_eventfd.c:563:\teventfd_ctx_put(eventfd);\ndrivers/hv/mshv_eventfd.c-564-\n--\ndrivers/hv/mshv_eventfd.c=633=static void ioeventfd_release(struct mshv_ioeventfd *p, u64 partition_id)\n--\ndrivers/hv/mshv_eventfd.c-636-\t\tmshv_unregister_doorbell(partition_id, p-\u003eiovntfd_doorbell_id);\ndrivers/hv/mshv_eventfd.c:637:\teventfd_ctx_put(p-\u003eiovntfd_eventfd);\ndrivers/hv/mshv_eventfd.c-638-\tkfree(p);\n--\ndrivers/hv/mshv_eventfd.c=673=static int mshv_assign_ioeventfd(struct mshv_partition *pt,\n--\ndrivers/hv/mshv_eventfd.c-767-fail:\ndrivers/hv/mshv_eventfd.c:768:\teventfd_ctx_put(eventfd);\ndrivers/hv/mshv_eventfd.c-769-\n--\ndrivers/hv/mshv_eventfd.c=773=static int mshv_deassign_ioeventfd(struct mshv_partition *pt,\n--\ndrivers/hv/mshv_eventfd.c-814-\ndrivers/hv/mshv_eventfd.c:815:\teventfd_ctx_put(eventfd);\ndrivers/hv/mshv_eventfd.c-816-\n--\ndrivers/hv/mshv_vtl_main.c=973=static int mshv_vtl_sint_ioctl_set_eventfd(struct mshv_vtl_set_eventfd __user *arg)\n--\ndrivers/hv/mshv_vtl_main.c-995-\t\tsynchronize_rcu();\ndrivers/hv/mshv_vtl_main.c:996:\t\teventfd_ctx_put(old_eventfd);\ndrivers/hv/mshv_vtl_main.c-997-\t}\n--\ndrivers/infiniband/hw/mlx5/devx.c=2072=static int UVERBS_HANDLER(MLX5_IB_METHOD_DEVX_SUBSCRIBE_EVENT)(\n--\ndrivers/infiniband/hw/mlx5/devx.c-2249-\t\tif (event_sub-\u003eeventfd)\ndrivers/infiniband/hw/mlx5/devx.c:2250:\t\t\teventfd_ctx_put(event_sub-\u003eeventfd);\ndrivers/infiniband/hw/mlx5/devx.c-2251-\t\tuverbs_uobject_put(\u0026event_sub-\u003eev_file-\u003euobj);\n--\ndrivers/infiniband/hw/mlx5/devx.c=2940=static void devx_free_subscription(struct rcu_head *rcu)\n--\ndrivers/infiniband/hw/mlx5/devx.c-2945-\tif (event_sub-\u003eeventfd)\ndrivers/infiniband/hw/mlx5/devx.c:2946:\t\teventfd_ctx_put(event_sub-\u003eeventfd);\ndrivers/infiniband/hw/mlx5/devx.c-2947-\tuverbs_uobject_put(\u0026event_sub-\u003eev_file-\u003euobj);\n--\ndrivers/misc/ocxl/file.c=191=static void irq_free(void *private)\n--\ndrivers/misc/ocxl/file.c-194-\ndrivers/misc/ocxl/file.c:195:\teventfd_ctx_put(ev_ctx);\ndrivers/misc/ocxl/file.c-196-}\n--\ndrivers/misc/ocxl/file.c=198=static long afu_ioctl(struct file *file, unsigned int cmd,\n--\ndrivers/misc/ocxl/file.c-259-\t\tif (rc)\ndrivers/misc/ocxl/file.c:260:\t\t\teventfd_ctx_put(ev_ctx);\ndrivers/misc/ocxl/file.c-261-\t\tbreak;\n--\ndrivers/s390/cio/vfio_ccw_ops.c=410=static int vfio_ccw_mdev_set_irqs(struct vfio_ccw_private *private,\n--\ndrivers/s390/cio/vfio_ccw_ops.c-460-\t\t\tif (*ctx)\ndrivers/s390/cio/vfio_ccw_ops.c:461:\t\t\t\teventfd_ctx_put(*ctx);\ndrivers/s390/cio/vfio_ccw_ops.c-462-\t\t\t*ctx = NULL;\n--\ndrivers/s390/cio/vfio_ccw_ops.c-470-\t\t\tif (*ctx)\ndrivers/s390/cio/vfio_ccw_ops.c:471:\t\t\t\teventfd_ctx_put(*ctx);\ndrivers/s390/cio/vfio_ccw_ops.c-472-\n--\ndrivers/s390/crypto/vfio_ap_ops.c=2172=static int vfio_ap_set_request_irq(struct ap_matrix_mdev *matrix_mdev,\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2187-\t\tif (matrix_mdev-\u003ereq_trigger)\ndrivers/s390/crypto/vfio_ap_ops.c:2188:\t\t\teventfd_ctx_put(matrix_mdev-\u003ereq_trigger);\ndrivers/s390/crypto/vfio_ap_ops.c-2189-\t\tmatrix_mdev-\u003ereq_trigger = NULL;\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2195-\t\tif (matrix_mdev-\u003ereq_trigger)\ndrivers/s390/crypto/vfio_ap_ops.c:2196:\t\t\teventfd_ctx_put(matrix_mdev-\u003ereq_trigger);\ndrivers/s390/crypto/vfio_ap_ops.c-2197-\n--\ndrivers/s390/crypto/vfio_ap_ops.c=2206=static int vfio_ap_set_cfg_change_irq(struct ap_matrix_mdev *matrix_mdev, unsigned long arg)\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2220-\t\tif (matrix_mdev-\u003ecfg_chg_trigger)\ndrivers/s390/crypto/vfio_ap_ops.c:2221:\t\t\teventfd_ctx_put(matrix_mdev-\u003ecfg_chg_trigger);\ndrivers/s390/crypto/vfio_ap_ops.c-2222-\t\tmatrix_mdev-\u003ecfg_chg_trigger = NULL;\n--\ndrivers/s390/crypto/vfio_ap_ops.c-2228-\t\tif (matrix_mdev-\u003ecfg_chg_trigger)\ndrivers/s390/crypto/vfio_ap_ops.c:2229:\t\t\teventfd_ctx_put(matrix_mdev-\u003ecfg_chg_trigger);\ndrivers/s390/crypto/vfio_ap_ops.c-2230-\n--\ndrivers/usb/gadget/function/f_fs.c=2289=static void ffs_data_clear(struct ffs_data *ffs)\n--\ndrivers/usb/gadget/function/f_fs.c-2313-\tif (ffs-\u003effs_eventfd) {\ndrivers/usb/gadget/function/f_fs.c:2314:\t\teventfd_ctx_put(ffs-\u003effs_eventfd);\ndrivers/usb/gadget/function/f_fs.c-2315-\t\tffs-\u003effs_eventfd = NULL;\n--\ndrivers/vdpa/vdpa_user/vduse_dev.c=496=static void vduse_dev_reset(struct vduse_dev *dev)\n--\ndrivers/vdpa/vdpa_user/vduse_dev.c-532-\t\t\tif (vq-\u003ekickfd)\ndrivers/vdpa/vdpa_user/vduse_dev.c:533:\t\t\t\teventfd_ctx_put(vq-\u003ekickfd);\ndrivers/vdpa/vdpa_user/vduse_dev.c-534-\t\t\tvq-\u003ekickfd = NULL;\n--\ndrivers/vdpa/vdpa_user/vduse_dev.c=1199=static int vduse_kickfd_setup(struct vduse_dev *dev,\n--\ndrivers/vdpa/vdpa_user/vduse_dev.c-1219-\tif (vq-\u003ekickfd)\ndrivers/vdpa/vdpa_user/vduse_dev.c:1220:\t\teventfd_ctx_put(vq-\u003ekickfd);\ndrivers/vdpa/vdpa_user/vduse_dev.c-1221-\tvq-\u003ekickfd = ctx;\n--\ndrivers/vfio/cdx/intr.c=58=static int vfio_cdx_msi_set_vector_signal(struct vfio_cdx_device *vdev,\n--\ndrivers/vfio/cdx/intr.c-71-\t\tkfree(vdev-\u003ecdx_irqs[vector].name);\ndrivers/vfio/cdx/intr.c:72:\t\teventfd_ctx_put(vdev-\u003ecdx_irqs[vector].trigger);\ndrivers/vfio/cdx/intr.c-73-\t\tvdev-\u003ecdx_irqs[vector].trigger = NULL;\n--\ndrivers/vfio/cdx/intr.c-93-\t\tkfree(vdev-\u003ecdx_irqs[vector].name);\ndrivers/vfio/cdx/intr.c:94:\t\teventfd_ctx_put(trigger);\ndrivers/vfio/cdx/intr.c-95-\t\treturn ret;\n--\ndrivers/vfio/fsl-mc/vfio_fsl_mc_intr.c=61=static int vfio_set_trigger(struct vfio_fsl_mc_device *vdev,\n--\ndrivers/vfio/fsl-mc/vfio_fsl_mc_intr.c-72-\t\tkfree(irq-\u003ename);\ndrivers/vfio/fsl-mc/vfio_fsl_mc_intr.c:73:\t\teventfd_ctx_put(irq-\u003etrigger);\ndrivers/vfio/fsl-mc/vfio_fsl_mc_intr.c-74-\t\tirq-\u003etrigger = NULL;\n--\ndrivers/vfio/fsl-mc/vfio_fsl_mc_intr.c-96-\t\tkfree(irq-\u003ename);\ndrivers/vfio/fsl-mc/vfio_fsl_mc_intr.c:97:\t\teventfd_ctx_put(trigger);\ndrivers/vfio/fsl-mc/vfio_fsl_mc_intr.c-98-\t\tirq-\u003etrigger = NULL;\n--\ndrivers/vfio/pci/vfio_pci_core.c=44=static void vfio_pci_eventfd_rcu_free(struct rcu_head *rcu)\n--\ndrivers/vfio/pci/vfio_pci_core.c-48-\ndrivers/vfio/pci/vfio_pci_core.c:49:\teventfd_ctx_put(eventfd-\u003ectx);\ndrivers/vfio/pci/vfio_pci_core.c-50-\tkfree(eventfd);\n--\ndrivers/vfio/pci/vfio_pci_core.c=413=static int vfio_pci_core_pm_entry_with_wakeup(\n--\ndrivers/vfio/pci/vfio_pci_core.c-438-\tif (ret)\ndrivers/vfio/pci/vfio_pci_core.c:439:\t\teventfd_ctx_put(efdctx);\ndrivers/vfio/pci/vfio_pci_core.c-440-\n--\ndrivers/vfio/pci/vfio_pci_core.c=444=static void __vfio_pci_runtime_pm_exit(struct vfio_pci_core_device *vdev)\n--\ndrivers/vfio/pci/vfio_pci_core.c-450-\t\tif (vdev-\u003epm_wake_eventfd_ctx) {\ndrivers/vfio/pci/vfio_pci_core.c:451:\t\t\teventfd_ctx_put(vdev-\u003epm_wake_eventfd_ctx);\ndrivers/vfio/pci/vfio_pci_core.c-452-\t\t\tvdev-\u003epm_wake_eventfd_ctx = NULL;\n--\ndrivers/vfio/pci/vfio_pci_intrs.c=324=static int vfio_intx_set_signal(struct vfio_pci_core_device *vdev,\n--\ndrivers/vfio/pci/vfio_pci_intrs.c-342-\t\tvfio_virqfd_flush_thread(\u0026ctx-\u003eunmask);\ndrivers/vfio/pci/vfio_pci_intrs.c:343:\t\teventfd_ctx_put(old);\ndrivers/vfio/pci/vfio_pci_intrs.c-344-\t}\n--\ndrivers/vfio/pci/vfio_pci_intrs.c=349=static void vfio_intx_disable(struct vfio_pci_core_device *vdev)\n--\ndrivers/vfio/pci/vfio_pci_intrs.c-362-\t\tif (ctx-\u003etrigger)\ndrivers/vfio/pci/vfio_pci_intrs.c:363:\t\t\teventfd_ctx_put(ctx-\u003etrigger);\ndrivers/vfio/pci/vfio_pci_intrs.c-364-\t\tkfree(ctx-\u003ename);\n--\ndrivers/vfio/pci/vfio_pci_intrs.c=447=static int vfio_msi_set_vector_signal(struct vfio_pci_core_device *vdev,\n--\ndrivers/vfio/pci/vfio_pci_intrs.c-465-\t\tkfree(ctx-\u003ename);\ndrivers/vfio/pci/vfio_pci_intrs.c:466:\t\teventfd_ctx_put(ctx-\u003etrigger);\ndrivers/vfio/pci/vfio_pci_intrs.c-467-\t\tvfio_irq_ctx_free(vdev, ctx, vector);\n--\ndrivers/vfio/pci/vfio_pci_intrs.c-525-out_put_eventfd_ctx:\ndrivers/vfio/pci/vfio_pci_intrs.c:526:\teventfd_ctx_put(trigger);\ndrivers/vfio/pci/vfio_pci_intrs.c-527-out_free_name:\n--\ndrivers/vfio/pci/vfio_pci_intrs.c=634=static int vfio_pci_set_intx_trigger(struct vfio_pci_core_device *vdev,\n--\ndrivers/vfio/pci/vfio_pci_intrs.c-662-\t\tif (ret \u0026\u0026 trigger)\ndrivers/vfio/pci/vfio_pci_intrs.c:663:\t\t\teventfd_ctx_put(trigger);\ndrivers/vfio/pci/vfio_pci_intrs.c-664-\n--\ndrivers/vfio/pci/vfio_pci_intrs.c=734=static int vfio_pci_set_ctx_trigger_single(struct vfio_pci_core_device *vdev,\n--\ndrivers/vfio/pci/vfio_pci_intrs.c-793-\t\t\tif (ret)\ndrivers/vfio/pci/vfio_pci_intrs.c:794:\t\t\t\teventfd_ctx_put(efdctx);\ndrivers/vfio/pci/vfio_pci_intrs.c-795-\n--\ndrivers/vfio/platform/vfio_platform_irq.c=182=static int vfio_set_trigger(struct vfio_platform_device *vdev, int index,\n--\ndrivers/vfio/platform/vfio_platform_irq.c-189-\t\tdisable_irq(irq-\u003ehwirq);\ndrivers/vfio/platform/vfio_platform_irq.c:190:\t\teventfd_ctx_put(irq-\u003etrigger);\ndrivers/vfio/platform/vfio_platform_irq.c-191-\t\tirq-\u003etrigger = NULL;\n--\ndrivers/vfio/platform/vfio_platform_irq.c=351=void vfio_platform_irq_cleanup(struct vfio_platform_device *vdev)\n--\ndrivers/vfio/platform/vfio_platform_irq.c-360-\t\t\tif (vdev-\u003eirqs[i].trigger)\ndrivers/vfio/platform/vfio_platform_irq.c:361:\t\t\t\teventfd_ctx_put(vdev-\u003eirqs[i].trigger);\ndrivers/vfio/platform/vfio_platform_irq.c-362-\t\t\tkfree(vdev-\u003eirqs[i].name);\n--\ndrivers/vfio/virqfd.c=85=static void virqfd_shutdown(struct work_struct *work)\n--\ndrivers/vfio/virqfd.c-91-\tflush_work(\u0026virqfd-\u003einject);\ndrivers/vfio/virqfd.c:92:\teventfd_ctx_put(virqfd-\u003eeventfd);\ndrivers/vfio/virqfd.c-93-\n--\ndrivers/vfio/virqfd.c=111=int vfio_virqfd_enable(void *opaque,\n--\ndrivers/vfio/virqfd.c-184-err_busy:\ndrivers/vfio/virqfd.c:185:\teventfd_ctx_put(ctx);\ndrivers/vfio/virqfd.c-186-err_fd:\n--\ndrivers/vhost/vdpa.c=519=static void vhost_vdpa_config_put(struct vhost_vdpa *v)\n--\ndrivers/vhost/vdpa.c-521-\tif (v-\u003econfig_ctx) {\ndrivers/vhost/vdpa.c:522:\t\teventfd_ctx_put(v-\u003econfig_ctx);\ndrivers/vhost/vdpa.c-523-\t\tv-\u003econfig_ctx = NULL;\n--\ndrivers/vhost/vdpa.c=527=static long vhost_vdpa_set_config_call(struct vhost_vdpa *v, u32 __user *argp)\n--\ndrivers/vhost/vdpa.c-541-\tif (!IS_ERR_OR_NULL(ctx))\ndrivers/vhost/vdpa.c:542:\t\teventfd_ctx_put(ctx);\ndrivers/vhost/vdpa.c-543-\n--\ndrivers/vhost/vhost.c=1203=void vhost_dev_cleanup(struct vhost_dev *dev)\n--\ndrivers/vhost/vhost.c-1208-\t\tif (dev-\u003evqs[i]-\u003eerror_ctx)\ndrivers/vhost/vhost.c:1209:\t\t\teventfd_ctx_put(dev-\u003evqs[i]-\u003eerror_ctx);\ndrivers/vhost/vhost.c-1210-\t\tif (dev-\u003evqs[i]-\u003ekick)\n--\ndrivers/vhost/vhost.c-1212-\t\tif (dev-\u003evqs[i]-\u003ecall_ctx.ctx)\ndrivers/vhost/vhost.c:1213:\t\t\teventfd_ctx_put(dev-\u003evqs[i]-\u003ecall_ctx.ctx);\ndrivers/vhost/vhost.c-1214-\t\tvhost_vq_reset(dev, dev-\u003evqs[i]);\n--\ndrivers/vhost/vhost.c-1217-\tif (dev-\u003elog_ctx)\ndrivers/vhost/vhost.c:1218:\t\teventfd_ctx_put(dev-\u003elog_ctx);\ndrivers/vhost/vhost.c-1219-\tdev-\u003elog_ctx = NULL;\n--\ndrivers/vhost/vhost.c=2150=long vhost_vring_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *argp)\n--\ndrivers/vhost/vhost.c-2274-\tif (!IS_ERR_OR_NULL(ctx))\ndrivers/vhost/vhost.c:2275:\t\teventfd_ctx_put(ctx);\ndrivers/vhost/vhost.c-2276-\tif (filep)\n--\ndrivers/vhost/vhost.c=2321=long vhost_dev_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *argp)\n--\ndrivers/vhost/vhost.c-2419-\t\tif (ctx)\ndrivers/vhost/vhost.c:2420:\t\t\teventfd_ctx_put(ctx);\ndrivers/vhost/vhost.c-2421-\t\tbreak;\n--\ndrivers/virt/acrn/ioeventfd.c=43=static void acrn_ioeventfd_shutdown(struct acrn_vm *vm, struct hsm_ioeventfd *p)\n--\ndrivers/virt/acrn/ioeventfd.c-46-\ndrivers/virt/acrn/ioeventfd.c:47:\teventfd_ctx_put(p-\u003eeventfd);\ndrivers/virt/acrn/ioeventfd.c-48-\tlist_del(\u0026p-\u003elist);\n--\ndrivers/virt/acrn/ioeventfd.c=76=static int acrn_ioeventfd_assign(struct acrn_vm *vm,\n--\ndrivers/virt/acrn/ioeventfd.c-142-fail:\ndrivers/virt/acrn/ioeventfd.c:143:\teventfd_ctx_put(eventfd);\ndrivers/virt/acrn/ioeventfd.c-144-\treturn ret;\n--\ndrivers/virt/acrn/ioeventfd.c=147=static int acrn_ioeventfd_deassign(struct acrn_vm *vm,\n--\ndrivers/virt/acrn/ioeventfd.c-168-\ndrivers/virt/acrn/ioeventfd.c:169:\teventfd_ctx_put(eventfd);\ndrivers/virt/acrn/ioeventfd.c-170-\treturn 0;\n--\ndrivers/virt/acrn/irqfd.c=60=static void hsm_irqfd_shutdown_work(struct work_struct *work)\n--\ndrivers/virt/acrn/irqfd.c-72-\teventfd_ctx_remove_wait_queue(irqfd-\u003eeventfd, \u0026irqfd-\u003ewait, \u0026cnt);\ndrivers/virt/acrn/irqfd.c:73:\teventfd_ctx_put(irqfd-\u003eeventfd);\ndrivers/virt/acrn/irqfd.c-74-\tkfree(irqfd);\n--\ndrivers/virt/acrn/irqfd.c=111=static int acrn_irqfd_assign(struct acrn_vm *vm, struct acrn_irqfd *args)\n--\ndrivers/virt/acrn/irqfd.c-170-fail:\ndrivers/virt/acrn/irqfd.c:171:\teventfd_ctx_put(eventfd);\ndrivers/virt/acrn/irqfd.c-172-out:\n--\ndrivers/virt/acrn/irqfd.c=177=static int acrn_irqfd_deassign(struct acrn_vm *vm,\n--\ndrivers/virt/acrn/irqfd.c-195-\tmutex_unlock(\u0026vm-\u003eirqfds_lock);\ndrivers/virt/acrn/irqfd.c:196:\teventfd_ctx_put(eventfd);\ndrivers/virt/acrn/irqfd.c-197-\n--\ndrivers/xen/privcmd.c=912=static void irqfd_shutdown(struct work_struct *work)\n--\ndrivers/xen/privcmd.c-921-\teventfd_ctx_remove_wait_queue(kirqfd-\u003eeventfd, \u0026kirqfd-\u003ewait, \u0026cnt);\ndrivers/xen/privcmd.c:922:\teventfd_ctx_put(kirqfd-\u003eeventfd);\ndrivers/xen/privcmd.c-923-\tkfree(kirqfd);\n--\ndrivers/xen/privcmd.c=976=static int privcmd_irqfd_assign(struct privcmd_irqfd *irqfd)\n--\ndrivers/xen/privcmd.c-1044-error_eventfd:\ndrivers/xen/privcmd.c:1045:\teventfd_ctx_put(kirqfd-\u003eeventfd);\ndrivers/xen/privcmd.c-1046-\n--\ndrivers/xen/privcmd.c=1052=static int privcmd_irqfd_deassign(struct privcmd_irqfd *irqfd)\n--\ndrivers/xen/privcmd.c-1072-\ndrivers/xen/privcmd.c:1073:\teventfd_ctx_put(eventfd);\ndrivers/xen/privcmd.c-1074-\n--\ndrivers/xen/privcmd.c=1346=static void ioeventfd_free(struct privcmd_kernel_ioeventfd *kioeventfd)\n--\ndrivers/xen/privcmd.c-1348-\tlist_del(\u0026kioeventfd-\u003elist);\ndrivers/xen/privcmd.c:1349:\teventfd_ctx_put(kioeventfd-\u003eeventfd);\ndrivers/xen/privcmd.c-1350-\tkfree(kioeventfd);\n--\ndrivers/xen/privcmd.c=1353=static int privcmd_ioeventfd_assign(struct privcmd_ioeventfd *ioeventfd)\n--\ndrivers/xen/privcmd.c-1403-error_eventfd:\ndrivers/xen/privcmd.c:1404:\teventfd_ctx_put(kioeventfd-\u003eeventfd);\ndrivers/xen/privcmd.c-1405-\n--\ndrivers/xen/privcmd.c=1411=static int privcmd_ioeventfd_deassign(struct privcmd_ioeventfd *ioeventfd)\n--\ndrivers/xen/privcmd.c-1454-\tmutex_unlock(\u0026ioreq_lock);\ndrivers/xen/privcmd.c:1455:\teventfd_ctx_put(eventfd);\ndrivers/xen/privcmd.c-1456-\n--\nfs/aio.c=1156=static inline void iocb_destroy(struct aio_kiocb *iocb)\n--\nfs/aio.c-1158-\tif (iocb-\u003eki_eventfd)\nfs/aio.c:1159:\t\teventfd_ctx_put(iocb-\u003eki_eventfd);\nfs/aio.c-1160-\tif (iocb-\u003eki_filp)\n--\nfs/eventfd.c=89=static void eventfd_free(struct kref *kref)\n--\nfs/eventfd.c-96-/**\nfs/eventfd.c:97: * eventfd_ctx_put - Releases a reference to the internal eventfd context.\nfs/eventfd.c-98- * @ctx: [in] Pointer to eventfd context.\n--\nfs/eventfd.c-102- */\nfs/eventfd.c:103:void eventfd_ctx_put(struct eventfd_ctx *ctx)\nfs/eventfd.c-104-{\n--\nfs/eventfd.c-109-}\nfs/eventfd.c:110:EXPORT_SYMBOL_GPL(eventfd_ctx_put);\nfs/eventfd.c-111-\nfs/eventfd.c=112=static int eventfd_release(struct inode *inode, struct file *file)\n--\nfs/eventfd.c-116-\twake_up_poll(\u0026ctx-\u003ewqh, EPOLLHUP);\nfs/eventfd.c:117:\teventfd_ctx_put(ctx);\nfs/eventfd.c-118-\treturn 0;\n--\ninclude/linux/eventfd.h=31=struct file;\n--\ninclude/linux/eventfd.h-34-\ninclude/linux/eventfd.h:35:void eventfd_ctx_put(struct eventfd_ctx *ctx);\ninclude/linux/eventfd.h-36-struct file *eventfd_fget(int fd);\n--\ninclude/linux/eventfd.h=61=static inline void eventfd_signal_mask(struct eventfd_ctx *ctx, __poll_t mask)\n--\ninclude/linux/eventfd.h-64-\ninclude/linux/eventfd.h:65:static inline void eventfd_ctx_put(struct eventfd_ctx *ctx)\ninclude/linux/eventfd.h-66-{\n--\ninclude/linux/eventfd.h=88=static inline void eventfd_signal(struct eventfd_ctx *ctx)\n--\ninclude/linux/eventfd.h-92-\ninclude/linux/eventfd.h:93:DEFINE_FREE(eventfd, struct eventfd_ctx *, eventfd_ctx_put(_T))\ninclude/linux/eventfd.h-94-\n--\nio_uring/eventfd.c=28=static void io_eventfd_free(struct rcu_head *rcu)\n--\nio_uring/eventfd.c-31-\nio_uring/eventfd.c:32:\teventfd_ctx_put(ev_fd-\u003ecq_ev_fd);\nio_uring/eventfd.c-33-\tkfree(ev_fd);\n--\nmm/memcontrol-v1.c=1020=static void memcg_event_remove(struct work_struct *work)\n--\nmm/memcontrol-v1.c-1032-\nmm/memcontrol-v1.c:1033:\teventfd_ctx_put(event-\u003eeventfd);\nmm/memcontrol-v1.c-1034-\tkfree(event);\n--\nmm/memcontrol-v1.c=1094=static ssize_t memcg_write_event_control(struct kernfs_open_file *of,\n--\nmm/memcontrol-v1.c-1227-out_put_eventfd:\nmm/memcontrol-v1.c:1228:\teventfd_ctx_put(event-\u003eeventfd);\nmm/memcontrol-v1.c-1229-out_kfree:\n--\nsamples/vfio-mdev/mtty.c=1534=static void mtty_disable_intx(struct mdev_state *mdev_state)\n--\nsamples/vfio-mdev/mtty.c-1536-\tif (mdev_state-\u003eintx_evtfd) {\nsamples/vfio-mdev/mtty.c:1537:\t\teventfd_ctx_put(mdev_state-\u003eintx_evtfd);\nsamples/vfio-mdev/mtty.c-1538-\t\tmdev_state-\u003eintx_evtfd = NULL;\n--\nsamples/vfio-mdev/mtty.c=1544=static void mtty_disable_msi(struct mdev_state *mdev_state)\n--\nsamples/vfio-mdev/mtty.c-1546-\tif (mdev_state-\u003emsi_evtfd) {\nsamples/vfio-mdev/mtty.c:1547:\t\teventfd_ctx_put(mdev_state-\u003emsi_evtfd);\nsamples/vfio-mdev/mtty.c-1548-\t\tmdev_state-\u003emsi_evtfd = NULL;\n--\nvirt/kvm/eventfd.c=123=irqfd_shutdown(struct work_struct *work)\n--\nvirt/kvm/eventfd.c-146-\t\tirqfd_resampler_shutdown(irqfd);\nvirt/kvm/eventfd.c:147:\t\teventfd_ctx_put(irqfd-\u003eresamplefd);\nvirt/kvm/eventfd.c-148-\t}\n--\nvirt/kvm/eventfd.c-155-#endif\nvirt/kvm/eventfd.c:156:\teventfd_ctx_put(irqfd-\u003eeventfd);\nvirt/kvm/eventfd.c-157-\tkfree(irqfd);\n--\nvirt/kvm/eventfd.c=371=kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args)\n--\nvirt/kvm/eventfd.c-512-\tif (resamplefd \u0026\u0026 !IS_ERR(resamplefd))\nvirt/kvm/eventfd.c:513:\t\teventfd_ctx_put(resamplefd);\nvirt/kvm/eventfd.c-514-\nvirt/kvm/eventfd.c-515-\tif (eventfd \u0026\u0026 !IS_ERR(eventfd))\nvirt/kvm/eventfd.c:516:\t\teventfd_ctx_put(eventfd);\nvirt/kvm/eventfd.c-517-\n--\nvirt/kvm/eventfd.c=590=kvm_irqfd_deassign(struct kvm *kvm, struct kvm_irqfd *args)\n--\nvirt/kvm/eventfd.c-606-\tspin_unlock_irq(\u0026kvm-\u003eirqfds.lock);\nvirt/kvm/eventfd.c:607:\teventfd_ctx_put(eventfd);\nvirt/kvm/eventfd.c-608-\n--\n\n"
}

							input: 20953
							output: 35
							thoughts: 219

**My Initial Thoughts on the Patch**

Okay, so `eventfd_ctx_put` is all over the kernel, huh?  KVM, AIO, io_uring, DRM syncobjs, vhost, even USB gadget stuff… that's a *lot* of places.  It's obviously a core function. Alright, I'm already tracking all these calls.

So, the patch is adding `if (IS_ERR_OR_NULL(ctx)) return;` to `eventfd_ctx_put()`.  That looks like a defensive check, guarding against a bad pointer.  Makes sense, particularly given the broad usage of the function.  I wonder, though, are there any potential side effects?  It's good that they are focusing on adding this.

Wait a second… before I dive deeper into the code that's calling it, I should also check if `include/linux/eventfd.h` has the dummy static inline for when `!CONFIG_EVENTFD`. Need to make sure the fix is correctly implemented. Checking that the header guard prevents the issues on kernels that don't even use eventfd would be a good step here.  Let me jump over to those lines and make sure the inline is what I expect.

{
  "File": "include/linux/eventfd.h",
  "FirstLine": 55,
  "LineCount": 40
}

{
  "Contents": "  55:\t\n  56:\tstatic inline struct eventfd_ctx *eventfd_ctx_fdget(int fd)\n  57:\t{\n  58:\t\treturn ERR_PTR(-ENOSYS);\n  59:\t}\n  60:\t\n  61:\tstatic inline void eventfd_signal_mask(struct eventfd_ctx *ctx, __poll_t mask)\n  62:\t{\n  63:\t}\n  64:\t\n  65:\tstatic inline void eventfd_ctx_put(struct eventfd_ctx *ctx)\n  66:\t{\n  67:\t\n  68:\t}\n  69:\t\n  70:\tstatic inline int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx,\n  71:\t\t\t\t\t\t\twait_queue_entry_t *wait, __u64 *cnt)\n  72:\t{\n  73:\t\treturn -ENOSYS;\n  74:\t}\n  75:\t\n  76:\tstatic inline bool eventfd_signal_allowed(void)\n  77:\t{\n  78:\t\treturn true;\n  79:\t}\n  80:\t\n  81:\tstatic inline void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt)\n  82:\t{\n  83:\t\n  84:\t}\n  85:\t\n  86:\t#endif\n  87:\t\n  88:\tstatic inline void eventfd_signal(struct eventfd_ctx *ctx)\n  89:\t{\n  90:\t\teventfd_signal_mask(ctx, 0);\n  91:\t}\n  92:\t\n  93:\tDEFINE_FREE(eventfd, struct eventfd_ctx *, eventfd_ctx_put(_T))\n  94:\t\n"
}

							input: 21951
							output: 28
							thoughts: 1118

**Analyzing a Kernel Crash Vulnerability and its Fix**

Okay, so I'm looking at this potential kernel issue, and it's all about how `eventfd` contexts are handled in the DRM (Direct Rendering Manager) subsystem, specifically in the context of sync objects. I'm focusing on the `drm_syncobj_eventfd_ioctl` function.

I started by looking at `include/linux/eventfd.h`, where the `DEFINE_FREE` macro is defined for `eventfd_ctx`, and then I traced its usage in `fs/eventfd.c` and specifically `eventfd_ctx_put`. This function, crucially, decrements a reference counter (`kref`) associated with the eventfd context.

The crux of the issue is in the interaction between `drm_syncobj_eventfd_ioctl` and `eventfd_ctx_put`.  The function `drm_syncobj_eventfd_ioctl` retrieves an `eventfd_ctx` using `eventfd_ctx_fdget`. The code uses the `__free` attribute to call `eventfd_ctx_put` on exit. If `eventfd_ctx_fdget` fails (returning an error pointer like `-EBADF` or `-EINVAL`), the function jumps to `err_fdget`, triggering the cleanup on the error pointer.

Here's the problem I see. *Before* the fix, `eventfd_ctx_put` *didn't* check if the `eventfd_ctx` pointer was an error pointer (using `IS_ERR_OR_NULL`). This meant that, if `eventfd_ctx_fdget` failed, calling `eventfd_ctx_put` on the returned error pointer would lead to an attempt to dereference a garbage pointer, causing a kernel crash (specifically, a page fault because `ctx->kref` would be invalid). This is a pretty straightforward use-after-free scenario.

The patch I'm looking at fixes this by adding `if (IS_ERR_OR_NULL(ctx)) return;` at the beginning of `eventfd_ctx_put`. This simple check makes the function safe to call with error pointers, preventing the dereference and the crash.  It's a textbook example of defensive programming, and a critical fix for a serious vulnerability.

I also see that other failure paths are handled correctly, such as if `kzalloc_obj` fails. In those cases, the check also safely handles the `eventfd_ctx_put` call.

Now, the important question is: is this code path reachable? The answer is YES!  `DRM_IOCTL_SYNCOBJ_EVENTFD` is exposed through virtio-gpu (and potentially other virtual DRM devices). This means a user-space application could trigger this code, potentially exploiting this vulnerability (before the fix) to crash the kernel or worse.  I need to check if vkms has `DRIVER_SYNCOBJ_TIMELINE`.

{
  "Expression": "vkms",
  "PathPrefix": "drivers/gpu/drm/"
}

{
  "Output": "\nFull output is too long, showing 500 out of 4708 lines.\nUse more precise expression if possible.\n\ndrivers/gpu/drm/Kconfig=361=source \"drivers/gpu/drm/virtio/Kconfig\"\ndrivers/gpu/drm/Kconfig:362:source \"drivers/gpu/drm/vkms/Kconfig\"\ndrivers/gpu/drm/Kconfig-363-source \"drivers/gpu/drm/vmwgfx/Kconfig\"\n--\ndrivers/gpu/drm/Makefile=186=obj-$(CONFIG_DRM_VGEM)\t+= vgem/\ndrivers/gpu/drm/Makefile:187:obj-$(CONFIG_DRM_VKMS)\t+= vkms/\ndrivers/gpu/drm/Makefile-188-obj-$(CONFIG_DRM_NOUVEAU) +=nouveau/\n--\ndrivers/gpu/drm/amd/amdgpu/Makefile=148=amdgpu-y += \\\ndrivers/gpu/drm/amd/amdgpu/Makefile-149-\tdce_v10_0.o \\\ndrivers/gpu/drm/amd/amdgpu/Makefile:150:\tamdgpu_vkms.o\ndrivers/gpu/drm/amd/amdgpu/Makefile-151-\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu.h=621=struct amdgpu_device {\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu.h-707-\tbool\t\t\t\tenable_virtual_display;\ndrivers/gpu/drm/amd/amdgpu/amdgpu.h:708:\tstruct amdgpu_vkms_output       *amdgpu_vkms_output;\ndrivers/gpu/drm/amd/amdgpu/amdgpu.h-709-\tstruct amdgpu_mode_info\t\tmode_info;\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c-102-#include \"jpeg_v4_0_5.h\"\ndrivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c:103:#include \"amdgpu_vkms.h\"\ndrivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c-104-#include \"mes_v11_0.h\"\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c=2642=static void amdgpu_discovery_set_sriov_display(struct amdgpu_device *adev)\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c-2644-\tamdgpu_device_set_sriov_virtual_display(adev);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c:2645:\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c-2646-}\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c=2649=static int amdgpu_discovery_set_display_ip_blocks(struct amdgpu_device *adev)\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c-2651-\tif (adev-\u003eenable_virtual_display) {\ndrivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c:2652:\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c-2653-\t\treturn 0;\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-18-#include \"ivsrcid/ivsrcid_vislands30.h\"\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:19:#include \"amdgpu_vkms.h\"\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-20-#include \"amdgpu_display.h\"\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-24-/**\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:25: * DOC: amdgpu_vkms\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-26- *\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:27: * The amdgpu vkms interface provides a virtual KMS interface for several use\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-28- * cases: devices without display hardware, platforms where the actual display\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-31- * usable. We previously emulated a legacy KMS interface, but there was a desire\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:32: * to move to the atomic KMS interface. The vkms driver did everything we\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-33- * needed, but we wanted KMS support natively in the driver without buffer\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-34- * sharing and the ability to support an instance of VKMS per device. We first\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:35: * looked at splitting vkms into a stub driver and a helper module that other\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-36- * drivers could use to implement a virtual display, but this strategy ended up\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-37- * being messy due to driver specific callbacks needed for buffer management.\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:38: * Ultimately, it proved easier to import the vkms code as it mostly used core\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-39- * drm helpers anyway.\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-41-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:42:static const u32 amdgpu_vkms_formats[] = {\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-43-\tDRM_FORMAT_XRGB8888,\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-45-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:46:static const struct drm_crtc_funcs amdgpu_vkms_crtc_funcs = {\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-47-\t.set_config             = drm_atomic_helper_set_config,\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-55-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:56:static const struct drm_crtc_helper_funcs amdgpu_vkms_crtc_helper_funcs = {\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-57-\tDRM_CRTC_HELPER_VBLANK_FUNCS,\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-59-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:60:static int amdgpu_vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-61-\t\t\t  struct drm_plane *primary, struct drm_plane *cursor)\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-67-\tret = drm_crtc_init_with_planes(dev, crtc, primary, cursor,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:68:\t\t\t\t\t\u0026amdgpu_vkms_crtc_funcs, NULL);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-69-\tif (ret) {\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-73-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:74:\tdrm_crtc_helper_add(crtc, \u0026amdgpu_vkms_crtc_helper_funcs);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-75-\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-85-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:86:static const struct drm_connector_funcs amdgpu_vkms_connector_funcs = {\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-87-\t.fill_modes = drm_helper_probe_single_connector_modes,\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-93-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:94:static int amdgpu_vkms_conn_get_modes(struct drm_connector *connector)\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-95-{\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-138-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:139:static const struct drm_connector_helper_funcs amdgpu_vkms_conn_helper_funcs = {\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:140:\t.get_modes    = amdgpu_vkms_conn_get_modes,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-141-};\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-142-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:143:static const struct drm_plane_funcs amdgpu_vkms_plane_funcs = {\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-144-\t.update_plane\t\t= drm_atomic_helper_update_plane,\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-151-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:152:static void amdgpu_vkms_plane_atomic_update(struct drm_plane *plane,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-153-\t\t\t\t\t    struct drm_atomic_commit *old_state)\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-157-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:158:static int amdgpu_vkms_plane_atomic_check(struct drm_plane *plane,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-159-\t\t\t\t\t  struct drm_atomic_commit *state)\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-187-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:188:static int amdgpu_vkms_prepare_fb(struct drm_plane *plane,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-189-\t\t\t\t  struct drm_plane_state *new_state)\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-257-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:258:static void amdgpu_vkms_cleanup_fb(struct drm_plane *plane,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-259-\t\t\t\t   struct drm_plane_state *old_state)\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-285-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:286:static const struct drm_plane_helper_funcs amdgpu_vkms_primary_helper_funcs = {\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:287:\t.atomic_update\t\t= amdgpu_vkms_plane_atomic_update,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:288:\t.atomic_check\t\t= amdgpu_vkms_plane_atomic_check,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:289:\t.prepare_fb\t\t= amdgpu_vkms_prepare_fb,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:290:\t.cleanup_fb\t\t= amdgpu_vkms_cleanup_fb,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-291-};\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-292-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:293:static struct drm_plane *amdgpu_vkms_plane_init(struct drm_device *dev,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-294-\t\t\t\t\t\tenum drm_plane_type type,\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-304-\tret = drm_universal_plane_init(dev, plane, 1 \u003c\u003c index,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:305:\t\t\t\t       \u0026amdgpu_vkms_plane_funcs,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:306:\t\t\t\t       amdgpu_vkms_formats,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:307:\t\t\t\t       ARRAY_SIZE(amdgpu_vkms_formats),\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-308-\t\t\t\t       NULL, type, NULL);\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-313-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:314:\tdrm_plane_helper_add(plane, \u0026amdgpu_vkms_primary_helper_funcs);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-315-\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c=319=static const struct drm_encoder_funcs drm_encoder_funcs_cleanup = {\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-322-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:323:static int amdgpu_vkms_output_init(struct drm_device *dev, struct\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:324:\t\t\t\t   amdgpu_vkms_output *output, int index)\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-325-{\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-331-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:332:\tprimary = amdgpu_vkms_plane_init(dev, DRM_PLANE_TYPE_PRIMARY, index);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-333-\tif (IS_ERR(primary))\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-335-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:336:\tret = amdgpu_vkms_crtc_init(dev, crtc, primary, cursor);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-337-\tif (ret)\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-339-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:340:\tret = drm_connector_init(dev, connector, \u0026amdgpu_vkms_connector_funcs,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-341-\t\t\t\t DRM_MODE_CONNECTOR_VIRTUAL);\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-346-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:347:\tdrm_connector_helper_add(connector, \u0026amdgpu_vkms_conn_helper_funcs);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-348-\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-382-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:383:const struct drm_mode_config_funcs amdgpu_vkms_mode_funcs = {\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-384-\t.fb_create = amdgpu_display_user_framebuffer_create,\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-388-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:389:static int amdgpu_vkms_sw_init(struct amdgpu_ip_block *ip_block)\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-390-{\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-393-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:394:\tadev-\u003eamdgpu_vkms_output = kzalloc_objs(struct amdgpu_vkms_output,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-395-\t\t\t\t\t\tadev-\u003emode_info.num_crtc);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:396:\tif (!adev-\u003eamdgpu_vkms_output)\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-397-\t\treturn -ENOMEM;\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-400-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:401:\tadev_to_drm(adev)-\u003emode_config.funcs = \u0026amdgpu_vkms_mode_funcs;\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-402-\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-416-\tfor (i = 0; i \u003c adev-\u003emode_info.num_crtc; i++) {\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:417:\t\tr = amdgpu_vkms_output_init(adev_to_drm(adev), \u0026adev-\u003eamdgpu_vkms_output[i], i);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-418-\t\tif (r)\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-431-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:432:static int amdgpu_vkms_sw_fini(struct amdgpu_ip_block *ip_block)\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-433-{\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-441-\tdrm_edid_free(adev-\u003emode_info.bios_hardcoded_edid);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:442:\tkfree(adev-\u003eamdgpu_vkms_output);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-443-\treturn 0;\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-445-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:446:static int amdgpu_vkms_hw_init(struct amdgpu_ip_block *ip_block)\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-447-{\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-483-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:484:static int amdgpu_vkms_hw_fini(struct amdgpu_ip_block *ip_block)\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-485-{\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-488-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:489:static int amdgpu_vkms_suspend(struct amdgpu_ip_block *ip_block)\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-490-{\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-500-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:501:static int amdgpu_vkms_resume(struct amdgpu_ip_block *ip_block)\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-502-{\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-504-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:505:\tr = amdgpu_vkms_hw_init(ip_block);\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-506-\tif (r)\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-510-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:511:static bool amdgpu_vkms_is_idle(struct amdgpu_ip_block *ip_block)\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-512-{\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-515-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:516:static int amdgpu_vkms_set_clockgating_state(struct amdgpu_ip_block *ip_block,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-517-\t\t\t\t\t  enum amd_clockgating_state state)\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-521-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:522:static int amdgpu_vkms_set_powergating_state(struct amdgpu_ip_block *ip_block,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-523-\t\t\t\t\t  enum amd_powergating_state state)\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-527-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:528:static const struct amd_ip_funcs amdgpu_vkms_ip_funcs = {\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:529:\t.name = \"amdgpu_vkms\",\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:530:\t.sw_init = amdgpu_vkms_sw_init,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:531:\t.sw_fini = amdgpu_vkms_sw_fini,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:532:\t.hw_init = amdgpu_vkms_hw_init,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:533:\t.hw_fini = amdgpu_vkms_hw_fini,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:534:\t.suspend = amdgpu_vkms_suspend,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:535:\t.resume = amdgpu_vkms_resume,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:536:\t.is_idle = amdgpu_vkms_is_idle,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:537:\t.set_clockgating_state = amdgpu_vkms_set_clockgating_state,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:538:\t.set_powergating_state = amdgpu_vkms_set_powergating_state,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-539-};\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-540-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:541:const struct amdgpu_ip_block_version amdgpu_vkms_ip_block = {\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-542-\t.type = AMD_IP_BLOCK_TYPE_DCE,\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-545-\t.rev = 0,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:546:\t.funcs = \u0026amdgpu_vkms_ip_funcs,\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c-547-};\n--\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h-11-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h:12:#define drm_crtc_to_amdgpu_vkms_output(target) \\\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h:13:\tcontainer_of(target, struct amdgpu_vkms_output, crtc.base)\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h-14-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h:15:extern const struct amdgpu_ip_block_version amdgpu_vkms_ip_block;\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h-16-\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h:17:struct amdgpu_vkms_output {\ndrivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h-18-\tstruct amdgpu_crtc crtc;\n--\ndrivers/gpu/drm/amd/amdgpu/cik.c-73-#include \"amdgpu_amdkfd.h\"\ndrivers/gpu/drm/amd/amdgpu/cik.c:74:#include \"amdgpu_vkms.h\"\ndrivers/gpu/drm/amd/amdgpu/cik.c-75-\n--\ndrivers/gpu/drm/amd/amdgpu/cik.c=2186=int cik_set_ip_blocks(struct amdgpu_device *adev)\n--\ndrivers/gpu/drm/amd/amdgpu/cik.c-2196-\t\tif (adev-\u003eenable_virtual_display)\ndrivers/gpu/drm/amd/amdgpu/cik.c:2197:\t\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/cik.c-2198-#if defined(CONFIG_DRM_AMD_DC)\n--\ndrivers/gpu/drm/amd/amdgpu/cik.c-2214-\t\tif (adev-\u003eenable_virtual_display)\ndrivers/gpu/drm/amd/amdgpu/cik.c:2215:\t\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/cik.c-2216-#if defined(CONFIG_DRM_AMD_DC)\n--\ndrivers/gpu/drm/amd/amdgpu/cik.c-2232-\t\tif (adev-\u003eenable_virtual_display)\ndrivers/gpu/drm/amd/amdgpu/cik.c:2233:\t\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/cik.c-2234-#if defined(CONFIG_DRM_AMD_DC)\n--\ndrivers/gpu/drm/amd/amdgpu/cik.c-2252-\t\tif (adev-\u003eenable_virtual_display)\ndrivers/gpu/drm/amd/amdgpu/cik.c:2253:\t\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/cik.c-2254-#if defined(CONFIG_DRM_AMD_DC)\n--\ndrivers/gpu/drm/amd/amdgpu/nv.c-61-#include \"jpeg_v3_0.h\"\ndrivers/gpu/drm/amd/amdgpu/nv.c:62:#include \"amdgpu_vkms.h\"\ndrivers/gpu/drm/amd/amdgpu/nv.c-63-#include \"mxgpu_nv.h\"\n--\ndrivers/gpu/drm/amd/amdgpu/si.c-72-#include \"amdgpu_dm.h\"\ndrivers/gpu/drm/amd/amdgpu/si.c:73:#include \"amdgpu_vkms.h\"\ndrivers/gpu/drm/amd/amdgpu/si.c-74-\n--\ndrivers/gpu/drm/amd/amdgpu/si.c=2687=int si_set_ip_blocks(struct amdgpu_device *adev)\n--\ndrivers/gpu/drm/amd/amdgpu/si.c-2699-\t\tif (adev-\u003eenable_virtual_display)\ndrivers/gpu/drm/amd/amdgpu/si.c:2700:\t\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/si.c-2701-#if defined(CONFIG_DRM_AMD_DC) \u0026\u0026 defined(CONFIG_DRM_AMD_DC_SI)\n--\ndrivers/gpu/drm/amd/amdgpu/si.c-2717-\t\tif (adev-\u003eenable_virtual_display)\ndrivers/gpu/drm/amd/amdgpu/si.c:2718:\t\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/si.c-2719-#if defined(CONFIG_DRM_AMD_DC) \u0026\u0026 defined(CONFIG_DRM_AMD_DC_SI)\n--\ndrivers/gpu/drm/amd/amdgpu/si.c-2734-\t\tif (adev-\u003eenable_virtual_display)\ndrivers/gpu/drm/amd/amdgpu/si.c:2735:\t\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/si.c-2736-\t\tbreak;\n--\ndrivers/gpu/drm/amd/amdgpu/soc15.c-75-#include \"smuio_v13_0.h\"\ndrivers/gpu/drm/amd/amdgpu/soc15.c:76:#include \"amdgpu_vkms.h\"\ndrivers/gpu/drm/amd/amdgpu/soc15.c-77-#include \"mxgpu_ai.h\"\n--\ndrivers/gpu/drm/amd/amdgpu/vi.c-79-#endif\ndrivers/gpu/drm/amd/amdgpu/vi.c:80:#include \"amdgpu_vkms.h\"\ndrivers/gpu/drm/amd/amdgpu/vi.c-81-#include \"mxgpu_vi.h\"\n--\ndrivers/gpu/drm/amd/amdgpu/vi.c=2048=int vi_set_ip_blocks(struct amdgpu_device *adev)\n--\ndrivers/gpu/drm/amd/amdgpu/vi.c-2061-\t\tif (adev-\u003eenable_virtual_display)\ndrivers/gpu/drm/amd/amdgpu/vi.c:2062:\t\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/vi.c-2063-\t\tbreak;\n--\ndrivers/gpu/drm/amd/amdgpu/vi.c-2071-\t\tif (adev-\u003eenable_virtual_display)\ndrivers/gpu/drm/amd/amdgpu/vi.c:2072:\t\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/vi.c-2073-#if defined(CONFIG_DRM_AMD_DC)\n--\ndrivers/gpu/drm/amd/amdgpu/vi.c-2091-\t\tif (adev-\u003eenable_virtual_display)\ndrivers/gpu/drm/amd/amdgpu/vi.c:2092:\t\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/vi.c-2093-#if defined(CONFIG_DRM_AMD_DC)\n--\ndrivers/gpu/drm/amd/amdgpu/vi.c-2114-\t\tif (adev-\u003eenable_virtual_display)\ndrivers/gpu/drm/amd/amdgpu/vi.c:2115:\t\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/vi.c-2116-#if defined(CONFIG_DRM_AMD_DC)\n--\ndrivers/gpu/drm/amd/amdgpu/vi.c-2130-\t\tif (adev-\u003eenable_virtual_display)\ndrivers/gpu/drm/amd/amdgpu/vi.c:2131:\t\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/vi.c-2132-#if defined(CONFIG_DRM_AMD_DC)\n--\ndrivers/gpu/drm/amd/amdgpu/vi.c-2149-\t\tif (adev-\u003eenable_virtual_display)\ndrivers/gpu/drm/amd/amdgpu/vi.c:2150:\t\t\tamdgpu_device_ip_block_add(adev, \u0026amdgpu_vkms_ip_block);\ndrivers/gpu/drm/amd/amdgpu/vi.c-2151-#if defined(CONFIG_DRM_AMD_DC)\n--\ndrivers/gpu/drm/ci/igt_runner.sh=25=case \"$DRIVER_NAME\" in\ndrivers/gpu/drm/ci/igt_runner.sh:26:    amdgpu|vkms|panthor)\ndrivers/gpu/drm/ci/igt_runner.sh-27-        # Cannot use HWCI_KERNEL_MODULES as at that point we don't have the module in /lib\n--\ndrivers/gpu/drm/ci/test.yml=469=virtio_gpu:none:\n--\ndrivers/gpu/drm/ci/test.yml-476-\ndrivers/gpu/drm/ci/test.yml:477:vkms:none:\ndrivers/gpu/drm/ci/test.yml-478-  extends:\n--\ndrivers/gpu/drm/ci/test.yml-480-  variables:\ndrivers/gpu/drm/ci/test.yml:481:    DRIVER_NAME: vkms\ndrivers/gpu/drm/ci/test.yml-482-    GPU_VERSION: none\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:1:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-2-# Bug Report: https://lore.kernel.org/dri-devel/61ed26af-062c-443c-9df2-d1ee319f3fb0@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=6=kms_cursor_legacy@long-nonblocking-modeset-vs-cursor-atomic\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-7-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:8:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-9-# Bug Report: https://lore.kernel.org/dri-devel/61ed26af-062c-443c-9df2-d1ee319f3fb0@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=13=kms_flip@basic-flip-vs-wf_vblank\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-14-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:15:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-16-# Bug Report: https://lore.kernel.org/dri-devel/61ed26af-062c-443c-9df2-d1ee319f3fb0@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=20=kms_flip@flip-vs-expired-vblank-interruptible\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-21-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:22:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-23-# Bug Report: https://lore.kernel.org/dri-devel/61ed26af-062c-443c-9df2-d1ee319f3fb0@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=27=kms_flip@flip-vs-wf_vblank-interruptible\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-28-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:29:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-30-# Bug Report: https://lore.kernel.org/dri-devel/61ed26af-062c-443c-9df2-d1ee319f3fb0@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=34=kms_flip@plain-flip-fb-recreate-interruptible\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-35-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:36:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-37-# Bug Report: https://lore.kernel.org/dri-devel/61ed26af-062c-443c-9df2-d1ee319f3fb0@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=41=kms_flip@plain-flip-ts-check\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-42-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:43:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-44-# Bug Report: https://lore.kernel.org/dri-devel/61ed26af-062c-443c-9df2-d1ee319f3fb0@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=48=kms_flip@plain-flip-ts-check-interruptible\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-49-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:50:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-51-# Bug Report: https://lore.kernel.org/dri-devel/61ed26af-062c-443c-9df2-d1ee319f3fb0@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=55=kms_flip@flip-vs-absolute-wf_vblank\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-56-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:57:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-58-# Bug Report: https://lore.kernel.org/dri-devel/61ed26af-062c-443c-9df2-d1ee319f3fb0@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=62=kms_flip@flip-vs-absolute-wf_vblank-interruptible\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-63-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:64:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-65-# Bug Report: https://lore.kernel.org/dri-devel/61ed26af-062c-443c-9df2-d1ee319f3fb0@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=69=kms_flip@flip-vs-blocking-wf-vblank\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-70-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:71:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-72-# Bug Report: https://lore.kernel.org/dri-devel/61ed26af-062c-443c-9df2-d1ee319f3fb0@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=76=kms_cursor_legacy@flip-vs-cursor-varying-size\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-77-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:78:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-79-# Bug Report: https://lore.kernel.org/dri-devel/61ed26af-062c-443c-9df2-d1ee319f3fb0@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=83=kms_flip@flip-vs-expired-vblank\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-84-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:85:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-86-# Bug Report: https://lore.kernel.org/dri-devel/61ed26af-062c-443c-9df2-d1ee319f3fb0@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=90=kms_pipe_crc_basic@nonblocking-crc-frame-sequence\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-91-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:92:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-93-# Bug Report: https://lore.kernel.org/dri-devel/2364a6bf-e6bc-4741-8c78-cea8bdb06e03@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=97=kms_flip@modeset-vs-vblank-race\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-98-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:99:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-100-# Bug Report: https://lore.kernel.org/dri-devel/f7d72ed9-a783-46d7-b75d-54072bda32a3@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=104=kms_pipe_crc_basic@suspend-read-crc\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-105-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:106:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-107-# Bug Report: https://lore.kernel.org/dri-devel/98d3ba54-bcb9-41ab-adb1-a18ba61ee2e4@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt=111=kms_plane@plane-panning-bottom-right-suspend\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-112-\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt:113:# Board Name: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-flakes.txt-114-# Bug Report: https://lore.kernel.org/dri-devel/b58d15eb-094d-4ac2-aad3-83e518c2f55d@collabora.com/T/#u\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:1:# keeps printing vkms_vblank_simulate: vblank timer overrun and never ends\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-2-kms_invalid_mode@int-max-clock\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt=6=kms_cursor_crc.*\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-10-# Hardware name: ChromiumOS crosvm, BIOS 0\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:11:# Workqueue: vkms_composer vkms_composer_worker [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:12:# RIP: 0010:compose_active_planes+0x1c7/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-13-# Code: c9 0f 84 6a 01 00 00 8b 42 30 2b 42 28 41 39 c5 0f 8c 6f 01 00 00 49 83 c7 01 49 39 df 74 3b 4b 8b 34 fc 48 8b 96 48 01 00 00 \u003c8b\u003e 42 78 89 c1 ...\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-28-#  ? asm_exc_page_fault+0x26/0x30\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:29:#  ? compose_active_planes+0x1c7/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:30:#  ? compose_active_planes+0x2a3/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-31-#  ? srso_return_thunk+0x5/0x5f\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:32:#  vkms_composer_worker+0x205/0x240 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-33-#  process_one_work+0x1f4/0x6b0\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-42-#  \u003c/TASK\u003e\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:43:# Modules linked in: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-44-# CR2: 0000000000000078\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-45-# ---[ end trace 0000000000000000 ]---\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:46:# RIP: 0010:compose_active_planes+0x1c7/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-47-# Code: c9 0f 84 6a 01 00 00 8b 42 30 2b 42 28 41 39 c5 0f 8c 6f 01 00 00 49 83 c7 01 49 39 df 74 3b 4b 8b 34 fc 48 8b 96 48 01 00 00 \u003c8b\u003e 42 78 89 c1 ...\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-61-# Hardware name: ChromiumOS crosvm, BIOS 0\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:62:# Workqueue: vkms_composer vkms_composer_worker [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:63:# RIP: 0010:compose_active_planes+0x1c7/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-64-# Code: c9 0f 84 6a 01 00 00 8b 42 30 2b 42 28 41 39 c5 0f 8c 6f 01 00 00 49 83 c7 01 49 39 df 74 3b 4b 8b 34 fc 48 8b 96 48 01 00 00 \u003c8b\u003e 42 78 89 c1 ...\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-79-#  ? asm_exc_page_fault+0x26/0x30\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:80:#  ? compose_active_planes+0x1c7/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:81:#  ? compose_active_planes+0x2a3/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-82-#  ? srso_return_thunk+0x5/0x5f\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:83:#  vkms_composer_worker+0x205/0x240 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-84-#  process_one_work+0x1f4/0x6b0\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-93-#  \u003c/TASK\u003e\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:94:# Modules linked in: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-95-# CR2: 0000000000000078\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-96-# ---[ end trace 0000000000000000 ]---\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:97:# RIP: 0010:compose_active_planes+0x1c7/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-98-# Code: c9 0f 84 6a 01 00 00 8b 42 30 2b 42 28 41 39 c5 0f 8c 6f 01 00 00 49 83 c7 01 49 39 df 74 3b 4b 8b 34 fc 48 8b 96 48 01 00 00 \u003c8b\u003e 42 78 89 c1 ...\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-112-# Hardware name: ChromiumOS crosvm, BIOS 0\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:113:# Workqueue: vkms_composer vkms_composer_worker [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:114:# RIP: 0010:compose_active_planes+0x344/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-115-# Code: 6a 34 0f 8e 91 fe ff ff 44 89 ea 48 8d 7c 24 48 e8 71 f0 ff ff 4b 8b 04 fc 48 8b 4c 24 50 48 8b 7c 24 40 48 8b 80 48 01 00 00 \u003c48\u003e 63 70 18 8b...\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-130-#  ? asm_exc_page_fault+0x26/0x30\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:131:#  ? compose_active_planes+0x344/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:132:#  ? compose_active_planes+0x32f/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-133-#  ? srso_return_thunk+0x5/0x5f\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:134:#  vkms_composer_worker+0x205/0x240 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-135-#  process_one_work+0x201/0x6c0\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-144-#  \u003c/TASK\u003e\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:145:# Modules linked in: vkms\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-146-# CR2: 0000000000000018\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-147-# ---[ end trace 0000000000000000 ]---\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:148:# RIP: 0010:compose_active_planes+0x344/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-149-# Code: 6a 34 0f 8e 91 fe ff ff 44 89 ea 48 8d 7c 24 48 e8 71 f0 ff ff 4b 8b 04 fc 48 8b 4c 24 50 48 8b 7c 24 40 48 8b 80 48 01 00 00 \u003c48\u003e 63 70 18 8b...\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt=160=kms_cursor_edge_walk@128x128-right-edge\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-163-# Hardware name: ChromiumOS crosvm, BIOS 0\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:164:# Workqueue: vkms_composer vkms_composer_worker [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:165:# RIP: 0010:compose_active_planes+0x344/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-166-# Code: 6a 34 0f 8e 91 fe ff ff 44 89 ea 48 8d 7c 24 48 e8 71 f0 ff ff 4b 8b 04 fc 48 8b 4c 24 50 48 8b 7c 24 40 48 8b 80 48 01 00 00 \u003c48\u003e 63 70 18 8b...\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-183-#  ? asm_exc_page_fault+0x26/0x30\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:184:#  ? compose_active_planes+0x344/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:185:#  ? compose_active_planes+0x32f/0x4e0 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-186-#  ? srso_return_thunk+0x5/0x5f\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:187:#  vkms_composer_worker+0x205/0x240 [vkms]\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-188-#  process_one_work+0x201/0x6c0\n--\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt-197-#  \u003c/TASK\u003e\ndrivers/gpu/drm/ci/xfails/vkms-none-skips.txt:198:# Modules linked in: vkms\n\n"
}

							input: 39887
							output: 32
							thoughts: 30

Okay, here's my take on those thoughts, framed as an expert's internal monologue:

**Diving into the VKMS Driver**

Alright, time to get my hands dirty and really understand what the Virtual KMS driver, `vkms_drv.c`, brings to the table. I need a clear picture of its capabilities. Specifically, I'm thinking of checking out `drivers/gpu/drm/vkms/vkms_drv.c` to do a deep dive and get a good grasp of the driver's feature set. This will help inform a better architectural plan. So, I’m going to start by going through the code. I need to see what this thing *actually* does.

{
  "Expression": "driver_features",
  "PathPrefix": "drivers/gpu/drm/vkms/"
}

{
  "Output": "drivers/gpu/drm/vkms/vkms_drv.c=93=static const struct drm_driver vkms_driver = {\ndrivers/gpu/drm/vkms/vkms_drv.c:94:\t.driver_features\t= DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_GEM,\ndrivers/gpu/drm/vkms/vkms_drv.c-95-\t.fops\t\t\t= \u0026vkms_driver_fops,\n"
}

							input: 40223
							output: 32
							thoughts: 56

Here's my summary, as if I were thinking these thoughts:

**Digging into Synchronization Objects**

Alright, so `vkms` is giving me some trouble with `DRIVER_SYNCOBJ_TIMELINE`. That's a bit unexpected. But, hold on a minute, I seem to recall that `virtio_gpu` might support it. Let me just quickly confirm that. Hmm, let me just open the source tree...

Okay, now, before I get too deep into this, I should probably check `vgem` just in case I am missing something. I'll need to look at `drivers/gpu/drm/vgem/vgem_drv.c` and see if the timeline support is in there, or if I should even expect it to be. Better to be thorough, I suppose.

{
  "Expression": "driver_features",
  "PathPrefix": "drivers/gpu/drm/vgem/"
}

{
  "Output": "drivers/gpu/drm/vgem/vgem_drv.c=110=static const struct drm_driver vgem_driver = {\ndrivers/gpu/drm/vgem/vgem_drv.c:111:\t.driver_features\t\t= DRIVER_GEM | DRIVER_RENDER,\ndrivers/gpu/drm/vgem/vgem_drv.c-112-\t.open\t\t\t\t= vgem_open,\n"
}

							input: 40599
							output: 31
							thoughts: 306

**Virtio-GPU and Syncobj: A Syzkaller Investigation**

Okay, so I'm diving into virtio-gpu, specifically looking at its driver implementation (`drivers/gpu/drm/virtio/virtgpu_drv.c`). It's a standard virtio hardware component that's well-supported in QEMU. That's a good starting point. I see it's a modesetting driver, supports GEM, rendering, atomic operations, sync objects, timelines and even cursor hot spots.

Now, I'm thinking about `eventfd`. It's a fundamental part of the core filesystem (`fs/eventfd.c`), with functions like `eventfd_ctx_put` living there. The real question is: does syzkaller, my go-to fuzzing tool, have DRM ioctls enabled? Specifically, does it support `DRM_IOCTL_SYNCOBJ_EVENTFD`?

A quick check confirms it! Syzkaller *does* have descriptions for `drm_syncobj_eventfd` in its `sys/linux/drm.txt` file. Perfect! It even has the structure definition: `ioctl$DRM_IOCTL_SYNCOBJ_EVENTFD(fd fd_drm, cmd const[DRM_IOCTL_SYNCOBJ_EVENTFD], arg ptr[in, drm_syncobj_eventfd])`.

Next, I need to understand the Kconfig dependencies. What configurations actually enable `drm_syncobj.c`? Gotta dig through the Kconfig files. Time to grep for `drm_syncobj.o` in the `drivers/gpu/drm/Makefile` to find out. This is all very promising for potential fuzzing targets.

{
  "Expression": "drm_syncobj\\.o",
  "PathPrefix": "drivers/gpu/drm"
}

{
  "Output": "drivers/gpu/drm/Makefile=35=drm-y := \\\n--\ndrivers/gpu/drm/Makefile-68-\tdrm_rect.o \\\ndrivers/gpu/drm/Makefile:69:\tdrm_syncobj.o \\\ndrivers/gpu/drm/Makefile-70-\tdrm_sysfs.o \\\n"
}

							input: 41393
							output: 25
							thoughts: 77

**My Line of Inquiry: DRM Sync Objects and EventFD**

Okay, so `drm_syncobj.o` is a fundamental part of the Direct Rendering Manager (DRM) ecosystem – built in whenever `CONFIG_DRM` is turned on, which is good to remember for future debugging. It's an implicit dependency, and understanding its role is key. And, to be specific, `virtio-gpu`'s inclusion is controlled by `CONFIG_DRM_VIRTIO_GPU`, so I'll keep that configuration option in mind.

Now, my current focus is on `fs/eventfd.c`. I have a feeling there is an overlap in the architecture. Let me quickly double-check the `fs/Makefile` to see how `eventfd.o` is handled at build time. A quick grep should reveal any relevant rules or dependencies. I need to understand its relationship to these other DRM components.

{
  "Expression": "eventfd\\.o",
  "PathPrefix": "fs"
}

{
  "Output": "fs/Makefile=28=obj-$(CONFIG_TIMERFD)\t\t+= timerfd.o\nfs/Makefile:29:obj-$(CONFIG_EVENTFD)\t\t+= eventfd.o\nfs/Makefile-30-obj-$(CONFIG_AIO)               += aio.o\n"
}

							input: 41769
							output: 37
							thoughts: 59

**Examining the Kernel Configuration for Virtualized Graphics**

Okay, so I'm looking at kernel configurations related to graphics and virtualized environments. My immediate focus is on how eventfd and DRM are integrated, given their importance in modern graphics stacks. I want to delve into this interaction further.

I'll start by checking the `CONFIG_DRM_VIRTIO_GPU` option. This seems like the key to virtualized graphics through the virtio interface. To understand how it's configured and what dependencies it has, I'll go straight to the source, the `drivers/gpu/drm/virtio/Kconfig` file. I need to understand this Kconfig file now. This will likely show me the prerequisites for `CONFIG_DRM_VIRTIO_GPU`, which features can be enabled, and how everything is connected. This should give me a better handle on the kernel configuration for virtio-based virtualized GPUs.

{
  "File": "drivers/gpu/drm/virtio/Kconfig",
  "FirstLine": 1,
  "LineCount": 30
}

{
  "Contents": "   1:\t# SPDX-License-Identifier: GPL-2.0-only\n   2:\tconfig DRM_VIRTIO_GPU\n   3:\t\ttristate \"Virtio GPU driver\"\n   4:\t\tdepends on DRM \u0026\u0026 VIRTIO_MENU \u0026\u0026 MMU\n   5:\t\tselect VIRTIO\n   6:\t\tselect DRM_CLIENT_SELECTION\n   7:\t\tselect DRM_KMS_HELPER\n   8:\t\tselect DRM_GEM_SHMEM_HELPER\n   9:\t\tselect VIRTIO_DMA_SHARED_BUFFER\n  10:\t\thelp\n  11:\t\t   This is the virtual GPU driver for virtio.  It can be used with\n  12:\t\t   QEMU based VMMs (like KVM or Xen).\n  13:\t\n  14:\t\t   If unsure say M.\n  15:\t\n  16:\tconfig DRM_VIRTIO_GPU_KMS\n  17:\t\tbool \"Virtio GPU driver modesetting support\"\n  18:\t\tdepends on DRM_VIRTIO_GPU\n  19:\t\tdefault y\n  20:\t\thelp\n  21:\t\t   Enable modesetting support for virtio GPU driver.  This can be\n  22:\t\t   disabled in cases where only \"headless\" usage of the GPU is\n  23:\t\t   required.\n  24:\t\n  25:\t\t   If unsure, say Y.\n"
}

							input: 42410
							output: 17
							thoughts: 43

Okay, here's my thought process as if I were considering this myself, tailored for a fellow expert:

**Investigating the EVENTFD Configuration**

Alright, time to dive into this `CONFIG_EVENTFD` situation. My first move is to confirm where it's defined and what context it's in. Let's start by checking the obvious location: the `fs/Kconfig` file. Given the name, it's highly likely it's a filesystem-related feature. Now, just to be thorough and cover all bases in the initial scoping, I'll quickly grep across `init/Kconfig` too, just in case it's declared there. Grabbing a simple search term like `config EVENTFD` should yield the precise definition in either file. I'm aiming for a quick and targeted scan to ensure I haven't missed anything obvious.

{
  "Expression": "config EVENTFD"
}

{
  "Output": "init/Kconfig=1923=config TIMERFD\n--\ninit/Kconfig-1931-\ninit/Kconfig:1932:config EVENTFD\ninit/Kconfig-1933-\tbool \"Enable eventfd() system call\" if EXPERT\n"
}

							input: 42730
							output: 33
							thoughts: 14

Here's a summary of my immediate thought process:

**Kconfig Dive: Investigating a Specific Year**

Okay, so I'm thinking, "Where should I start looking to understand or address something related to the year 1932 within this context?" My gut reaction is to check the `init/Kconfig` file. That's usually the go-to place for core system configuration and dependencies. It's a fundamental part of the build system. Let's see if 1932 is defined there, or if there's any indication of its relevance within the configuration options. It's the most logical first step when dealing with configuration parameters.

{
  "File": "init/Kconfig",
  "FirstLine": 1930,
  "LineCount": 15
}

{
  "Contents": "1930:\t\t  If unsure, say Y.\n1931:\t\n1932:\tconfig EVENTFD\n1933:\t\tbool \"Enable eventfd() system call\" if EXPERT\n1934:\t\tdefault y\n1935:\t\thelp\n1936:\t\t  Enable the eventfd() system call that allows to receive both\n1937:\t\t  kernel notification (ie. KAIO) or userspace notifications.\n1938:\t\n1939:\t\t  If unsure, say Y.\n1940:\t\n1941:\tconfig SHMEM\n1942:\t\tbool \"Use full shmem filesystem\" if EXPERT\n1943:\t\tdefault y\n1944:\t\tdepends on MMU\n"
}

							input: 43117
							output: 20
							thoughts: 753

**Analyzing Function Call Scope for Fuzzing Prioritization**

Alright, let's break this down. We're looking at configurations related to eventfds (`CONFIG_EVENTFD`), Direct Rendering Manager (`CONFIG_DRM`), and specifically the VirtIO GPU in DRM (`CONFIG_DRM_VIRTIO_GPU`). The task is to identify key functions for fuzzing.

My initial thought is to examine the changes. I see two functions were modified: `drm_syncobj_eventfd_ioctl` in `drivers/gpu/drm/drm_syncobj.c` and `eventfd_ctx_put` in `fs/eventfd.c`.

Now, the red flag goes up. The documentation warns against listing "ubiquitous lifecycle hot-paths." I have to ask myself: Is `eventfd_ctx_put` ubiquitous? It's called when an eventfd context is closed or released, so no, it's pretty specific. It's not memory allocation, a page fault handler, or core synchronization.

But, and this is the important part, could it be called by *almost every program* in the corpus? No, it's only programs that use eventfd, such as KVM, io_uring eventfd, vhost, DRM syncobj eventfd, etc. So we're in the clear there.

What about `drm_syncobj_eventfd_ioctl`? It's the exact entrypoint function that's been modified! Perfect, that's definitely a target.

Can I include `eventfd_ctx_put` as well? Let's check the guidance: "List functions that specifically implement the logic being added or altered, or direct API entrypoints for the subsystem feature under review." Bingo, the patch modifies *both* `eventfd_ctx_put` and `drm_syncobj_eventfd_ioctl`. So, they both fit the description.

These aren't static functions, they were modified, and not ubiquitous. Let's make sure `drm_syncobj_eventfd_ioctl` is non-static: I can see it's exposed via `drm_ioctls` and `eventfd_ctx_put` is `EXPORT_SYMBOL_GPL(eventfd_ctx_put)`. Good.

Just to be thorough, I have to check for other changed functions. I see `DEFINE_FREE` in `include/linux/eventfd.h` with `eventfd_ctx_put`. This is defining a cleanup function such as `free_eventfd` or `class_eventfd_destructor`. I need to understand exactly how `DEFINE_FREE` is used. I'll check `include/linux/cleanup.h`.

{
  "Expression": "#define DEFINE_FREE"
}

{
  "Output": "fs/xfs/xfs_trace.h=3115=DECLARE_EVENT_CLASS(xfs_free_extent_deferred_class,\n--\nfs/xfs/xfs_trace.h-3142-);\nfs/xfs/xfs_trace.h:3143:#define DEFINE_FREE_EXTENT_DEFERRED_EVENT(name) \\\nfs/xfs/xfs_trace.h-3144-DEFINE_EVENT(xfs_free_extent_deferred_class, name, \\\n--\nfs/xfs/xfs_trace.h=5897=DECLARE_EVENT_CLASS(xfs_freeblocks_resv_class,\n--\nfs/xfs/xfs_trace.h-5924-)\nfs/xfs/xfs_trace.h:5925:#define DEFINE_FREEBLOCKS_RESV_EVENT(name) \\\nfs/xfs/xfs_trace.h-5926-DEFINE_EVENT(xfs_freeblocks_resv_class, name, \\\n--\ninclude/linux/cleanup.h-209-\ninclude/linux/cleanup.h:210:#define DEFINE_FREE(_name, _type, _free) \\\ninclude/linux/cleanup.h-211-\tstatic __always_inline void __free_##_name(void *p) { _type _T = *(_type *)p; _free; }\n--\ninclude/trace/events/dma.h=206=DECLARE_EVENT_CLASS(dma_free_class,\n--\ninclude/trace/events/dma.h-237-\ninclude/trace/events/dma.h:238:#define DEFINE_FREE_EVENT(name) \\\ninclude/trace/events/dma.h-239-DEFINE_EVENT(dma_free_class, name, \\\n"
}

							input: 44932
							output: 207
							thoughts: 851

**Analysis of the Patch for Fuzzing Suitability**

Okay, let's break this down for fuzzing purposes. The core of this patch involves `DEFINE_FREE`, which expands to a static inline function, meaning it's not a standalone symbol in vmlinux. Crucially, the caller in this specific instance is `drm_syncobj_eventfd_ioctl`.

First, we need to determine if it's worth fuzzing. The patch touches reachable, executable code, so that is our criteria. The stated goals for patch fuzzing are to find bugs, regressions, and such. The primary hurdle is reachability. This code is indeed reachable. We should never blindly trust claims of "no functional change" or refactoring; let's dig deeper.

This patch modifies code in `fs/eventfd.c` (VFS/syscall level) and `drivers/gpu/drm/drm_syncobj.c` (DRM syncobj ioctl).  The `eventfd_ctx_put()` function has been modified to handle `IS_ERR_OR_NULL(ctx)`, which could expose potential NULL pointer dereference or error handling issues, or memory issues in the case the cleanup isn't handled correctly. The DRM syncobj ioctl is reachable via DRM devices supporting syncobj timelines, specifically virtio-gpu in QEMU.  This refactoring uses a cleanup.h RAII, specifically `__free(eventfd)`. It's a combination of a core subsystem (eventfd) and a reachable driver framework (DRM syncobj / virtio-gpu). Since the code is reachable executable code, we consider it to be worth fuzzing.

Next, we check the necessary configuration options. We need `EVENTFD` to enable the `fs/eventfd.c` code, `DRM` to enable the DRM subsystem, and `DRM_VIRTIO_GPU` which allows the `drm_syncobj_eventfd_ioctl` function to be exercised through virtio-gpu in QEMU. These are all boolean configs, defined appropriately in the kernel's Kconfig files.

The key symbols to focus on are `drm_syncobj_eventfd_ioctl` and `eventfd_ctx_put`. These are the only two C functions directly touched by the changes.

Therefore, the parameters for `set-results` should be:

*   `EnableConfigs`: `["DRM", "DRM_VIRTIO_GPU", "EVENTFD"]`
*   `FocusSymbols`: `["drm_syncobj_eventfd_ioctl", "eventfd_ctx_put"]`
*   `Reasoning`: This patch modifies reachable executable code in both a core filesystem component (eventfd) and a driver framework (DRM syncobj), specifically through the virtio-gpu driver within QEMU. This is a refactoring, introducing RAII cleanup which handles the `__free` logic to the eventfd, which could expose errors due to incorrectly handled null or error conditions or memory corruption.
*   `WorthFuzzing`: `true`

Alright, that covers all the bases. I think we're ready to call `set-results`.

{
  "EnableConfigs": [
    "DRM",
    "DRM_VIRTIO_GPU",
    "EVENTFD"
  ],
  "FocusSymbols": [
    "drm_syncobj_eventfd_ioctl",
    "eventfd_ctx_put"
  ],
  "Reasoning": "The patch updates eventfd_ctx_put() in fs/eventfd.c to safely handle IS_ERR_OR_NULL pointers and introduces the DEFINE_FREE(eventfd, ...) scoped cleanup helper, which is then used to refactor resource release and error paths in drm_syncobj_eventfd_ioctl(). The modified code is executable and fully reachable from userspace via virtio-gpu in standard QEMU environments (which supports DRIVER_SYNCOBJ_TIMELINE). Fuzzing is warranted to verify that the cleanup attribute handling and new NULL/ERR checks do not introduce reference leaks, double puts, or other regressions under error paths.",
  "WorthFuzzing": true
}

{
  "EnableConfigs": [
    "DRM",
    "DRM_VIRTIO_GPU",
    "EVENTFD"
  ],
  "FocusSymbols": [
    "drm_syncobj_eventfd_ioctl",
    "eventfd_ctx_put"
  ],
  "Reasoning": "The patch updates eventfd_ctx_put() in fs/eventfd.c to safely handle IS_ERR_OR_NULL pointers and introduces the DEFINE_FREE(eventfd, ...) scoped cleanup helper, which is then used to refactor resource release and error paths in drm_syncobj_eventfd_ioctl(). The modified code is executable and fully reachable from userspace via virtio-gpu in standard QEMU environments (which supports DRIVER_SYNCOBJ_TIMELINE). Fuzzing is warranted to verify that the cleanup attribute handling and new NULL/ERR checks do not introduce reference leaks, double puts, or other regressions under error paths.",
  "WorthFuzzing": true
}

{
  "WorthFuzzing": true
}

{
  "KMSANReasoning": "The patch introduces a `__free(eventfd)` cleanup helper using the `DEFINE_FREE` macro and refactors `drm_syncobj_eventfd_ioctl()` to use automatic resource management (`__free` and `no_free_ptr`) for `struct eventfd_ctx`. Additionally, `eventfd_ctx_put()` is updated to safely handle `NULL` or error pointers via `IS_ERR_OR_NULL(ctx)`.\n\nThese changes concern pointer lifetime and resource deallocation. The local pointer `ev_fd_ctx` is explicitly initialized to `NULL`, and the heap allocation `entry` continues to be zero-allocated via `kzalloc_obj()`. No uninitialized memory, padding bytes, or user-space copies are introduced or altered. Any potential bugs would relate to reference counting, resource leaks, or pointer cleanup, which fall under standard KASAN/refcount tracking rather than KMSAN uninitialized memory detection. Therefore, a dedicated KMSAN fuzzing session is not warranted.",
  "NeedsKMSAN": false
}

You are an expert Linux kernel security engineer specializing in kernel memory
error detectors (KASAN and KMSAN). Your job is to review the provided patch series and
determine if the code changes justify spawning a dedicated KMSAN (KernelMemorySanitizer)
fuzzing session in addition to standard KASAN fuzzing.

CRITICAL DISTINCTION BETWEEN KASAN AND KMSAN:
- Standard KASAN kernel builds (upstream-apparmor-kasan.config) already enable
  a comprehensive suite of debugging tools and sanitizers, including KASAN
  (out-of-bounds accesses, use-after-free, double free, invalid free), LOCKDEP
  (locking bugs and deadlocks), UB-sanitizers, and memory corruption checks.
- KMSAN (KernelMemorySanitizer) detects reads of UNINITIALIZED memory (stack, heap,
  or page allocations) and kernel-to-user memory info-leaks.

Rule: THERE IS NO SENSE IN RUNNING A KMSAN SESSION IF A BUG CAN BE CAUGHT BY KASAN,
LOCKDEP, OR OTHER STANDARD BUG DETECTORS.
A dedicated KMSAN fuzzing session incurs significant resource costs. You must ONLY
set NeedsKMSAN=true if the code changes introduce or expose UNINITIALIZED MEMORY risks
that are detected ONLY by KMSAN.

Look holistically at the patch series and surrounding code. Even if no direct
uninitialized field accesses or new buffer allocations are added in the diff itself,
a patch may alter control flow, bounds checking, or data length calculations in ways
that change how the rest of the code operates on existing buffers (e.g. allowing
uninitialized stack/heap memory to be read, copied to user space, or used in control
flow). Do not hesitate to use your code access tools to inspect the surrounding code,
called functions, and callers.

Set NeedsKMSAN=true ONLY IF the patch introduces or modifies:
1. Kernel structures sent to user space (via copy_to_user, put_user, netlink skb
   attributes, ioctl output arguments, socket options, or BPF buffers) where fields
   or structure padding might not be fully initialized/zeroed.
2. Conditional logic or branching that depends on potentially uninitialized variables
   or struct fields.
3. Allocation or initialization of complex data structures where uninitialized fields
   could be read later in reachable code paths.
4. Bounds checks, lengths, or logic in a way that allows surrounding code to access
   uninitialized bytes of existing buffers.

Set NeedsKMSAN=false IF:
- The code changes primarily risk out-of-bounds access, array overflows, NULL pointer
  dereferences, locking deadlocks, or use-after-free bugs (these are already caught
  by KASAN, LOCKDEP, or standard bug detectors).
- All stack/heap structures touched or introduced by the patch are fully zeroed
  or initialized (e.g. using = {0}, memset, kzalloc) before being read or copied.
- The patch does not introduce any risk of uninitialized memory usage or info-leaks.

Use your code access tools to inspect the surrounding code if necessary, then provide
detailed KMSANReasoning contrasting KASAN vs KMSAN applicability for this patch.
Prefer calling several tools at the same time to save round-trips.


Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.

Target architecture: amd64

For your convenience, here is the diff of the changes:
commit c5df43be3ebc21de489c5599cca83bfbb4cd878c
Author: syz-cluster <triage@syzkaller.com>
Date:   Tue Sep 15 14:23:02 2026 +0000

    syz-cluster: applied patch under review

diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
index c23a5de27effa..efc4e8af220c8 100644
--- a/drivers/gpu/drm/drm_syncobj.c
+++ b/drivers/gpu/drm/drm_syncobj.c
@@ -1462,9 +1462,9 @@ int
 drm_syncobj_eventfd_ioctl(struct drm_device *dev, void *data,
 			  struct drm_file *file_private)
 {
+	struct eventfd_ctx *ev_fd_ctx __free(eventfd) = NULL;
 	struct drm_syncobj_eventfd *args = data;
 	struct drm_syncobj *syncobj;
-	struct eventfd_ctx *ev_fd_ctx;
 	struct syncobj_eventfd_entry *entry;
 	int ret;
 
@@ -1490,10 +1490,10 @@ drm_syncobj_eventfd_ioctl(struct drm_device *dev, void *data,
 	entry = kzalloc_obj(*entry);
 	if (!entry) {
 		ret = -ENOMEM;
-		goto err_kzalloc;
+		goto err_fdget;
 	}
 	entry->syncobj = syncobj;
-	entry->ev_fd_ctx = ev_fd_ctx;
+	entry->ev_fd_ctx = no_free_ptr(ev_fd_ctx);
 	entry->point = args->point;
 	entry->flags = args->flags;
 
@@ -1502,8 +1502,6 @@ drm_syncobj_eventfd_ioctl(struct drm_device *dev, void *data,
 
 	return 0;
 
-err_kzalloc:
-	eventfd_ctx_put(ev_fd_ctx);
 err_fdget:
 	drm_syncobj_put(syncobj);
 	return ret;
diff --git a/fs/eventfd.c b/fs/eventfd.c
index 9d33a02757d52..1cd1741b81b17 100644
--- a/fs/eventfd.c
+++ b/fs/eventfd.c
@@ -102,6 +102,9 @@ static void eventfd_free(struct kref *kref)
  */
 void eventfd_ctx_put(struct eventfd_ctx *ctx)
 {
+	if (IS_ERR_OR_NULL(ctx))
+		return;
+
 	kref_put(&ctx->kref, eventfd_free);
 }
 EXPORT_SYMBOL_GPL(eventfd_ctx_put);
diff --git a/include/linux/eventfd.h b/include/linux/eventfd.h
index e32bee4345fb9..689358c2b0ae7 100644
--- a/include/linux/eventfd.h
+++ b/include/linux/eventfd.h
@@ -10,6 +10,7 @@
 #define _LINUX_EVENTFD_H
 
 #include <linux/wait.h>
+#include <linux/cleanup.h>
 #include <linux/err.h>
 #include <linux/percpu-defs.h>
 #include <linux/percpu.h>
@@ -89,5 +90,7 @@ static inline void eventfd_signal(struct eventfd_ctx *ctx)
 	eventfd_signal_mask(ctx, 0);
 }
 
+DEFINE_FREE(eventfd, struct eventfd_ctx *, eventfd_ctx_put(_T))
+
 #endif /* _LINUX_EVENTFD_H */

							input: 2804
							output: 41
							thoughts: 997

**Analyzing the `drm_syncobj_eventfd_ioctl` Patch**

Okay, let's dive into this patch. I see changes to `drivers/gpu/drm/drm_syncobj.c`, `fs/eventfd.c`, and `include/linux/eventfd.h`.  My initial thought is that this is likely related to handling event file descriptors in the context of DRM sync objects. I'll need to parse the diff to ascertain the specifics.

First thing I notice in `drm_syncobj_eventfd_ioctl` is a new local variable declaration: `struct eventfd_ctx *ev_fd_ctx __free(eventfd) = NULL;`.  Ah, they're using a cleanup handler, `__free(eventfd)`. This is interesting; they're associating the `eventfd_ctx_put` function with the variable, and the cleanup will be triggered when the variable goes out of scope, or when `no_free_ptr()` is called on it.

Previously, `ev_fd_ctx` was declared and initialized separately, and the function's error handling used `eventfd_ctx_put` when an error occurred, likely to free the eventfd context. This pattern is fairly common, so it's a good place to start. Now, it seems like the cleanup is integrated, making the code more robust and potentially simpler.

Further down, the code now uses `no_free_ptr(ev_fd_ctx)` when assigning it to `entry->ev_fd_ctx`. This is crucial. It prevents the cleanup handler from running when `entry->ev_fd_ctx` goes out of scope, because the eventfd context is now managed elsewhere.

The change in `fs/eventfd.c` adds a check to `eventfd_ctx_put` for a `NULL` or `ERR_PTR` pointer, which makes sense as it allows handling of cases where the context wasn't properly initialized. I'll need to remember that.

Finally, the `include/linux/eventfd.h` change adds a `DEFINE_FREE` macro for `eventfd`, which clearly associates the `eventfd_ctx_put` function with the `eventfd_ctx` struct for use with the `__free` attribute. This is the core of the cleanup mechanism and provides a cleaner and safer way to manage the lifetime of the `eventfd_ctx` object.

In summary, this patch is refactoring the error handling and resource management of event file descriptors within the `drm_syncobj_eventfd_ioctl` function. It's using cleanup handlers to automatically release the `eventfd_ctx` on scope exit or manual call to `no_free_ptr`, thus reducing the chance of memory leaks and making the code more readable and maintainable. This seems like a positive change that I should definitely take note of.

{
  "File": "drivers/gpu/drm/drm_syncobj.c",
  "FirstLine": 1460,
  "LineCount": 55
}

{
  "Contents": "1460:\t\n1461:\tint\n1462:\tdrm_syncobj_eventfd_ioctl(struct drm_device *dev, void *data,\n1463:\t\t\t\t  struct drm_file *file_private)\n1464:\t{\n1465:\t\tstruct eventfd_ctx *ev_fd_ctx __free(eventfd) = NULL;\n1466:\t\tstruct drm_syncobj_eventfd *args = data;\n1467:\t\tstruct drm_syncobj *syncobj;\n1468:\t\tstruct syncobj_eventfd_entry *entry;\n1469:\t\tint ret;\n1470:\t\n1471:\t\tif (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))\n1472:\t\t\treturn -EOPNOTSUPP;\n1473:\t\n1474:\t\tif (args-\u003eflags \u0026 ~DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE)\n1475:\t\t\treturn -EINVAL;\n1476:\t\n1477:\t\tif (args-\u003epad)\n1478:\t\t\treturn -EINVAL;\n1479:\t\n1480:\t\tsyncobj = drm_syncobj_find(file_private, args-\u003ehandle);\n1481:\t\tif (!syncobj)\n1482:\t\t\treturn -ENOENT;\n1483:\t\n1484:\t\tev_fd_ctx = eventfd_ctx_fdget(args-\u003efd);\n1485:\t\tif (IS_ERR(ev_fd_ctx)) {\n1486:\t\t\tret = PTR_ERR(ev_fd_ctx);\n1487:\t\t\tgoto err_fdget;\n1488:\t\t}\n1489:\t\n1490:\t\tentry = kzalloc_obj(*entry);\n1491:\t\tif (!entry) {\n1492:\t\t\tret = -ENOMEM;\n1493:\t\t\tgoto err_fdget;\n1494:\t\t}\n1495:\t\tentry-\u003esyncobj = syncobj;\n1496:\t\tentry-\u003eev_fd_ctx = no_free_ptr(ev_fd_ctx);\n1497:\t\tentry-\u003epoint = args-\u003epoint;\n1498:\t\tentry-\u003eflags = args-\u003eflags;\n1499:\t\n1500:\t\tdrm_syncobj_add_eventfd(syncobj, entry);\n1501:\t\tdrm_syncobj_put(syncobj);\n1502:\t\n1503:\t\treturn 0;\n1504:\t\n1505:\terr_fdget:\n1506:\t\tdrm_syncobj_put(syncobj);\n1507:\t\treturn ret;\n1508:\t}\n1509:\t\n1510:\tint\n1511:\tdrm_syncobj_reset_ioctl(struct drm_device *dev, void *data,\n1512:\t\t\t\tstruct drm_file *file_private)\n1513:\t{\n1514:\t\tstruct drm_syncobj_array *args = data;\n"
}

							input: 5251
							output: 236
							thoughts: 898

**Analyzing the Patch for Uninitialized Memory Risks**

Okay, let's break this down. First, I see a refactoring centered around resource management, specifically using the `__free` cleanup attribute and the `eventfd_ctx_put` function. It's designed to handle resource lifetime and prevent potential leaks or use-after-free bugs.

The patch seems pretty straightforward:

1. It defines `DEFINE_FREE` for `eventfd` contexts.
2. It updates `eventfd_ctx_put` to safely handle `NULL` or error pointers. This is good practice.
3. In `drm_syncobj_eventfd_ioctl`, we have a `struct eventfd_ctx *ev_fd_ctx __free(eventfd) = NULL;` declaration. The ownership gets transferred to `entry` via `no_free_ptr`. Crucially, error paths now safely free `ev_fd_ctx` if it's not `NULL` (or it's an error pointer, which `eventfd_ctx_put` handles). The removal of `err_kzalloc` simplifies the error handling.

Now, the question is: does this patch introduce any risks of uninitialized memory usage or kernel information leaks that would warrant KMSAN? Let's go through the checklist carefully:

1. **Kernel structures to userspace?** Nope. The input, `void *data`, comes from the DRM ioctl framework. No new information is being copied to userspace.
2. **Conditional logic based on uninitialized variables?** No again. `ev_fd_ctx` is explicitly initialized to `NULL`.
3. **Complex structures with uninitialized fields?** `entry` is allocated using `kzalloc_obj`, which *zeroes* the memory.
4. **Bounds checks or logic that exposes uninitialized bytes?** No, nothing here.

This refactoring is all about resource cleanup and avoiding memory management bugs—specifically use-after-free or double-free, leaks. These are *standard* memory management issues that KASAN, refcount detectors, or leak detectors would catch. It's not about uninitialized memory reads or information leaks.

Given all of this, the criteria outlined are clear: *KMSAN is not needed* in this case. The patch does not introduce the types of risks that KMSAN is designed to catch. The code changes risk out-of-bounds access, array overflows, NULL pointer dereferences, locking deadlocks, or use-after-free bugs. The structures touched or introduced by the patch are fully zeroed or initialized. The patch does not introduce any risk of uninitialized memory usage or info-leaks. Therefore, `NeedsKMSAN=false`. Let's prepare the call to `set-results`.

{
  "KMSANReasoning": "The patch introduces a `__free(eventfd)` cleanup helper using the `DEFINE_FREE` macro and refactors `drm_syncobj_eventfd_ioctl()` to use automatic resource management (`__free` and `no_free_ptr`) for `struct eventfd_ctx`. Additionally, `eventfd_ctx_put()` is updated to safely handle `NULL` or error pointers via `IS_ERR_OR_NULL(ctx)`.\n\nThese changes concern pointer lifetime and resource deallocation. The local pointer `ev_fd_ctx` is explicitly initialized to `NULL`, and the heap allocation `entry` continues to be zero-allocated via `kzalloc_obj()`. No uninitialized memory, padding bytes, or user-space copies are introduced or altered. Any potential bugs would relate to reference counting, resource leaks, or pointer cleanup, which fall under standard KASAN/refcount tracking rather than KMSAN uninitialized memory detection. Therefore, a dedicated KMSAN fuzzing session is not warranted.",
  "NeedsKMSAN": false
}

{
  "KMSANReasoning": "The patch introduces a `__free(eventfd)` cleanup helper using the `DEFINE_FREE` macro and refactors `drm_syncobj_eventfd_ioctl()` to use automatic resource management (`__free` and `no_free_ptr`) for `struct eventfd_ctx`. Additionally, `eventfd_ctx_put()` is updated to safely handle `NULL` or error pointers via `IS_ERR_OR_NULL(ctx)`.\n\nThese changes concern pointer lifetime and resource deallocation. The local pointer `ev_fd_ctx` is explicitly initialized to `NULL`, and the heap allocation `entry` continues to be zero-allocated via `kzalloc_obj()`. No uninitialized memory, padding bytes, or user-space copies are introduced or altered. Any potential bugs would relate to reference counting, resource leaks, or pointer cleanup, which fall under standard KASAN/refcount tracking rather than KMSAN uninitialized memory detection. Therefore, a dedicated KMSAN fuzzing session is not warranted.",
  "NeedsKMSAN": false
}

LLM Calls Summary:
Total Calls	Total Tokens	Avg Tokens	Total Duration (Seconds)	Avg Duration (Seconds)

Tool Calls Summary:
Total Calls	Total Duration (Seconds)	Avg Duration (Seconds)