AI Trajectory


Trajectory: (Expand/Collapse All)
Seq Timestamp Type Name Duration
0/0 2026/09/24 04:36 flow patch-triage
3m Args: 
null

Results: 
{
  "EnableConfigs": [
    "NETFS_SUPPORT",
    "MEM_ALLOC_PROFILING",
    "NET_9P",
    "9P_FS"
  ],
  "FocusSymbols": [
    "netfs_alloc_request",
    "netfs_alloc_subrequest",
    "netfs_folioq_alloc"
  ],
  "KMSANReasoning": "The patch introduces the helper macro `netfs_mempool_alloc_noreserve(_pool, _gfp)`, which wraps direct calls to `(_pool)-\u003ealloc()` in `alloc_hooks(...)` for allocation profiling (`CONFIG_MEM_ALLOC_PROFILING`). It replaces direct invocations of `mempool-\u003ealloc(gfp, mempool-\u003epool_data)` with this macro across `fs/netfs/objects.c` and `fs/netfs/rolling_buffer.c`.\n\nThe change does not alter the allocation behavior, object size, memory layout, or initialization of the allocated structures (`netfs_io_request`, `netfs_io_subrequest`, or `folio_queue`). All allocated objects continue to be initialized as before (e.g., zeroed via `memset`). No new data is exposed to user space, nor is any control flow altered based on uninitialized memory. Therefore, no uninitialized memory risks or info-leaks are introduced, and a dedicated KMSAN session is not needed.",
  "NeedsKMSAN": false,
  "Reasoning": "The patch introduces `netfs_mempool_alloc_noreserve()` wrapped with `alloc_hooks()` to ensure allocations bypassing mempool reserve pools are properly tracked by memory allocation profiling (`CONFIG_MEM_ALLOC_PROFILING`). This alters allocation handling in `netfs_alloc_request()`, `netfs_alloc_subrequest()`, and `netfs_folioq_alloc()`. The netfs subsystem is reachable in virtualized environments (e.g., via 9p mounts), making this change worth fuzzing to detect any allocation profiling invariants or tag state corruption issues.",
  "WorthFuzzing": true
}
1/1 2026/09/24 04:36 action read-patch-diff
0m Args: 
null

Results: 
{
  "PatchDiff": "commit b4119a72e6f6b4e41d149ceb510185bb308a8d77\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Thu Sep 24 04:36:00 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/fs/netfs/internal.h b/fs/netfs/internal.h\nindex c79c8e69d60ca..08ba7f0ebff04 100644\n--- a/fs/netfs/internal.h\n+++ b/fs/netfs/internal.h\n@@ -45,6 +45,9 @@ extern mempool_t netfs_request_pool;\n extern mempool_t netfs_subrequest_pool;\n extern mempool_t netfs_folioq_pool;\n \n+#define netfs_mempool_alloc_noreserve(_pool, _gfp)\t\t\t\t\\\n+\talloc_hooks((_pool)-\u003ealloc(_gfp, (_pool)-\u003epool_data))\n+\n #ifdef CONFIG_PROC_FS\n static inline void netfs_proc_add_rreq(struct netfs_io_request *rreq)\n {\ndiff --git a/fs/netfs/objects.c b/fs/netfs/objects.c\nindex 7f6a3e912602e..0b509c93d4afc 100644\n--- a/fs/netfs/objects.c\n+++ b/fs/netfs/objects.c\n@@ -34,7 +34,7 @@ struct netfs_io_request *netfs_alloc_request(struct address_space *mapping,\n \n \t\trreq = mempool_alloc(mempool, gfp);\n \t} else {\n-\t\trreq = mempool-\u003ealloc(gfp, mempool-\u003epool_data);\n+\t\trreq = netfs_mempool_alloc_noreserve(mempool, gfp);\n \t\tif (!rreq)\n \t\t\treturn ERR_PTR(-ENOMEM);\n \t}\n@@ -214,7 +214,7 @@ struct netfs_io_subrequest *netfs_alloc_subrequest(struct netfs_io_request *rreq\n \tstruct kmem_cache *cache = mempool-\u003epool_data;\n \n \tif (rreq-\u003egfp == GFP_KERNEL)\n-\t\tsubreq = mempool-\u003ealloc(rreq-\u003egfp, mempool-\u003epool_data);\n+\t\tsubreq = netfs_mempool_alloc_noreserve(mempool, rreq-\u003egfp);\n \telse\n \t\tsubreq = mempool_alloc(mempool, rreq-\u003egfp);\n \tif (!subreq)\ndiff --git a/fs/netfs/rolling_buffer.c b/fs/netfs/rolling_buffer.c\nindex 424e77a9a1098..54867ceaa205f 100644\n--- a/fs/netfs/rolling_buffer.c\n+++ b/fs/netfs/rolling_buffer.c\n@@ -29,7 +29,7 @@ struct folio_queue *netfs_folioq_alloc(unsigned int rreq_id, gfp_t gfp,\n \tstruct folio_queue *fq;\n \n \tif (gfp == GFP_KERNEL)\n-\t\tfq = netfs_folioq_pool.alloc(gfp, netfs_folioq_pool.pool_data);\n+\t\tfq = netfs_mempool_alloc_noreserve(\u0026netfs_folioq_pool, gfp);\n \telse\n \t\tfq = mempool_alloc(\u0026netfs_folioq_pool, gfp);\n \tif (fq) {\n"
}
2/1 2026/09/24 04:36 agent patch-evaluator
1m Model: 
core

Args: 
null

Results: 
{
  "EnableConfigs": [
    "NETFS_SUPPORT",
    "MEM_ALLOC_PROFILING",
    "NET_9P",
    "9P_FS"
  ],
  "FocusSymbols": [
    "netfs_alloc_request",
    "netfs_alloc_subrequest",
    "netfs_folioq_alloc"
  ],
  "Reasoning": "The patch introduces `netfs_mempool_alloc_noreserve()` wrapped with `alloc_hooks()` to ensure allocations bypassing mempool reserve pools are properly tracked by memory allocation profiling (`CONFIG_MEM_ALLOC_PROFILING`). This alters allocation handling in `netfs_alloc_request()`, `netfs_alloc_subrequest()`, and `netfs_folioq_alloc()`. The netfs subsystem is reachable in virtualized environments (e.g., via 9p mounts), making this change worth fuzzing to detect any allocation profiling invariants or tag state corruption issues.",
  "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 b4119a72e6f6b4e41d149ceb510185bb308a8d77
Author: syz-cluster <triage@syzkaller.com>
Date:   Thu Sep 24 04:36:00 2026 +0000

    syz-cluster: applied patch under review

diff --git a/fs/netfs/internal.h b/fs/netfs/internal.h
index c79c8e69d60ca..08ba7f0ebff04 100644
--- a/fs/netfs/internal.h
+++ b/fs/netfs/internal.h
@@ -45,6 +45,9 @@ extern mempool_t netfs_request_pool;
 extern mempool_t netfs_subrequest_pool;
 extern mempool_t netfs_folioq_pool;
 
+#define netfs_mempool_alloc_noreserve(_pool, _gfp)				\
+	alloc_hooks((_pool)->alloc(_gfp, (_pool)->pool_data))
+
 #ifdef CONFIG_PROC_FS
 static inline void netfs_proc_add_rreq(struct netfs_io_request *rreq)
 {
diff --git a/fs/netfs/objects.c b/fs/netfs/objects.c
index 7f6a3e912602e..0b509c93d4afc 100644
--- a/fs/netfs/objects.c
+++ b/fs/netfs/objects.c
@@ -34,7 +34,7 @@ struct netfs_io_request *netfs_alloc_request(struct address_space *mapping,
 
 		rreq = mempool_alloc(mempool, gfp);
 	} else {
-		rreq = mempool->alloc(gfp, mempool->pool_data);
+		rreq = netfs_mempool_alloc_noreserve(mempool, gfp);
 		if (!rreq)
 			return ERR_PTR(-ENOMEM);
 	}
@@ -214,7 +214,7 @@ struct netfs_io_subrequest *netfs_alloc_subrequest(struct netfs_io_request *rreq
 	struct kmem_cache *cache = mempool->pool_data;
 
 	if (rreq->gfp == GFP_KERNEL)
-		subreq = mempool->alloc(rreq->gfp, mempool->pool_data);
+		subreq = netfs_mempool_alloc_noreserve(mempool, rreq->gfp);
 	else
 		subreq = mempool_alloc(mempool, rreq->gfp);
 	if (!subreq)
diff --git a/fs/netfs/rolling_buffer.c b/fs/netfs/rolling_buffer.c
index 424e77a9a1098..54867ceaa205f 100644
--- a/fs/netfs/rolling_buffer.c
+++ b/fs/netfs/rolling_buffer.c
@@ -29,7 +29,7 @@ struct folio_queue *netfs_folioq_alloc(unsigned int rreq_id, gfp_t gfp,
 	struct folio_queue *fq;
 
 	if (gfp == GFP_KERNEL)
-		fq = netfs_folioq_pool.alloc(gfp, netfs_folioq_pool.pool_data);
+		fq = netfs_mempool_alloc_noreserve(&netfs_folioq_pool, gfp);
 	else
 		fq = mempool_alloc(&netfs_folioq_pool, gfp);
 	if (fq) {

3/2 2026/09/24 04:36 llm patch-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 3503
							output: 33
							thoughts: 392

Thoughts: 
**Analyzing a NetFS Patch**

Okay, let's dive into this patch. I see changes focused on `fs/netfs`. Looks like we have some modifications related to memory pool allocation within the `netfs` file system. Specifically, there's a new macro defined in `internal.h`, `netfs_mempool_alloc_noreserve`, which seems to be the key.

Examining `objects.c`, I see that the patch replaces direct calls to the memory pool's `alloc` function in `netfs_alloc_request` and `netfs_alloc_subrequest` with this new macro. Similarly, in `rolling_buffer.c`, the folio queue allocation also switches to using the macro.  This suggests we're attempting to abstract or centralize the memory allocation process for netfs.  I'm guessing this might be related to more fine-grained control over resource reservations.

Now, I need more context. I should check the commit history using `git log` to understand the rationale behind these changes. Or, better yet, the commit message should tell me. Ah, wait, I can also look at the files or use tooling. Let's see...  We don't have a direct `git log` tool, but we do have `grepper` and `read-file`. Let's get that context. Before I do that, let me just quickly glance over `fs/netfs/Kconfig` and its callers to see if anything jumps out. I should have a good understanding of the netfs architecture before I dig into the history.

4/2 2026/09/24 04:36 tool read-file
0m Args: 
{
  "File": "fs/netfs/Kconfig",
  "FirstLine": 1,
  "LineCount": 50
}

Results: 
{
  "Contents": "   1:\t# SPDX-License-Identifier: GPL-2.0-only\n   2:\t\n   3:\tconfig NETFS_SUPPORT\n   4:\t\ttristate\n   5:\t\thelp\n   6:\t\t  This option enables support for network filesystems, including\n   7:\t\t  helpers for high-level buffered I/O, abstracting out read\n   8:\t\t  segmentation, local caching and transparent huge page support.\n   9:\t\n  10:\tconfig NETFS_STATS\n  11:\t\tbool \"Gather statistical information on local caching\"\n  12:\t\tdepends on NETFS_SUPPORT \u0026\u0026 PROC_FS\n  13:\t\thelp\n  14:\t\t  This option causes statistical information to be gathered on local\n  15:\t\t  caching and exported through file:\n  16:\t\n  17:\t\t\t/proc/fs/fscache/stats\n  18:\t\n  19:\t\t  The gathering of statistics adds a certain amount of overhead to\n  20:\t\t  execution as there are a quite a few stats gathered, and on a\n  21:\t\t  multi-CPU system these may be on cachelines that keep bouncing\n  22:\t\t  between CPUs.  On the other hand, the stats are very useful for\n  23:\t\t  debugging purposes.  Saying 'Y' here is recommended.\n  24:\t\n  25:\tconfig NETFS_DEBUG\n  26:\t\tbool \"Enable dynamic debugging netfslib and FS-Cache\"\n  27:\t\tdepends on NETFS_SUPPORT\n  28:\t\thelp\n  29:\t\t  This permits debugging to be dynamically enabled in the local caching\n  30:\t\t  management module.  If this is set, the debugging output may be\n  31:\t\t  enabled by setting bits in /sys/module/netfs/parameters/debug.\n  32:\t\n  33:\tconfig FSCACHE\n  34:\t\tbool \"General filesystem local caching manager\"\n  35:\t\tdepends on NETFS_SUPPORT\n  36:\t\thelp\n  37:\t\t  This option enables a generic filesystem caching manager that can be\n  38:\t\t  used by various network and other filesystems to cache data locally.\n  39:\t\t  Different sorts of caches can be plugged in, depending on the\n  40:\t\t  resources available.\n  41:\t\n  42:\t\t  See Documentation/filesystems/caching/fscache.rst for more information.\n  43:\t\n  44:\tconfig FSCACHE_STATS\n  45:\t\tbool \"Gather statistical information on local caching\"\n  46:\t\tdepends on FSCACHE \u0026\u0026 PROC_FS\n  47:\t\tselect NETFS_STATS\n  48:\t\thelp\n  49:\t\t  This option causes statistical information to be gathered on local\n  50:\t\t  caching and exported through file:\n"
}
5/2 2026/09/24 04:36 llm patch-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 4953
							output: 19
							thoughts: 25

Thoughts: 
Okay, let's dive into this. Here's my thought process on this:

**Investigating `alloc_hooks` in the Kernel**

Alright, time to get to the bottom of this. My initial instinct is to understand the kernel's perspective on `alloc_hooks`. It's a pretty good starting point to identify where this plays a part. The most direct approach is to see where it's *defined* and *used* within the kernel source. To do this, I'll leverage the power of `grep`. It's my go-to tool for this kind of quick investigation. With the power of grep, I should be able to identify relevant code.

6/2 2026/09/24 04:36 tool grepper
0m Args: 
{
  "Expression": "#define alloc_hooks"
}

Results: 
{
  "Output": "include/linux/alloc_tag.h=249=static inline bool alloc_tag_is_inaccurate(struct alloc_tag *tag) { return false; }\n--\ninclude/linux/alloc_tag.h-253-\ninclude/linux/alloc_tag.h:254:#define alloc_hooks_tag(_tag, _do_alloc)\t\t\t\t\\\ninclude/linux/alloc_tag.h-255-({\t\t\t\t\t\t\t\t\t\\\n--\ninclude/linux/alloc_tag.h-266-\ninclude/linux/alloc_tag.h:267:#define alloc_hooks(_do_alloc)\t\t\t\t\t\t\\\ninclude/linux/alloc_tag.h-268-({\t\t\t\t\t\t\t\t\t\\\n"
}
7/2 2026/09/24 04:36 llm patch-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 5319
							output: 37
							thoughts: 44

Thoughts: 
Here's my summary, as though I'm thinking through this process:

**Diving into Allocation Profiling**

Okay, so we're dealing with allocation profiling, which, from what I gather, hinges on the `alloc_hooks` mechanism, and this is all thanks to `CONFIG_MEM_ALLOC_PROFILING` being enabled. I need to get a better handle on how this works under the hood. My first port of call will be to dig into `include/linux/alloc_tag.h`. Specifically, I'm going to focus my attention around line 267. That seems like a reasonable starting point to understand the fundamental mechanics of allocation tagging and how the hooks are implemented. Let's see what we can find there.

8/2 2026/09/24 04:36 tool read-file
0m Args: 
{
  "File": "include/linux/alloc_tag.h",
  "FirstLine": 250,
  "LineCount": 40
}

Results: 
{
  "Contents": " 250:\t#define alloc_tag_record(p)\tdo {} while (0)\n 251:\t\n 252:\t#endif /* CONFIG_MEM_ALLOC_PROFILING */\n 253:\t\n 254:\t#define alloc_hooks_tag(_tag, _do_alloc)\t\t\t\t\\\n 255:\t({\t\t\t\t\t\t\t\t\t\\\n 256:\t\ttypeof(_do_alloc) _res;\t\t\t\t\t\t\\\n 257:\t\tif (mem_alloc_profiling_enabled()) {\t\t\t\t\\\n 258:\t\t\tstruct alloc_tag * __maybe_unused _old;\t\t\t\\\n 259:\t\t\t_old = alloc_tag_save(_tag);\t\t\t\t\\\n 260:\t\t\t_res = _do_alloc;\t\t\t\t\t\\\n 261:\t\t\talloc_tag_restore(_tag, _old);\t\t\t\t\\\n 262:\t\t} else\t\t\t\t\t\t\t\t\\\n 263:\t\t\t_res = _do_alloc;\t\t\t\t\t\\\n 264:\t\t_res;\t\t\t\t\t\t\t\t\\\n 265:\t})\n 266:\t\n 267:\t#define alloc_hooks(_do_alloc)\t\t\t\t\t\t\\\n 268:\t({\t\t\t\t\t\t\t\t\t\\\n 269:\t\tDEFINE_ALLOC_TAG(_alloc_tag);\t\t\t\t\t\\\n 270:\t\talloc_hooks_tag(\u0026_alloc_tag, _do_alloc);\t\t\t\\\n 271:\t})\n 272:\t\n 273:\t#endif /* _LINUX_ALLOC_TAG_H */\n"
}
9/2 2026/09/24 04:36 llm patch-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 5945
							output: 35
							thoughts: 42

Thoughts: 
Okay, here's my take on those thoughts, tailored for an expert audience:

**Diving into the `mempool_alloc()` Implementation**

Alright, that's interesting! I'm seeing a `mempool_alloc()` call and, as always, my instinct is to dig into the heart of the matter. My mental gears are already turning, tracing the likely path to the definition. Let's immediately consult the standard source: `include/linux/mempool.h`. I need to understand the fundamental mechanics of this allocation function – the underlying data structures, any potential locking mechanisms employed, and, of course, the general design choices made by the kernel developers. Knowing this header file will give me a first understanding and will help to understand any possible problems. The real details may well be in the actual implementation files that include this header, but I can get a big picture overview by reading this header file first. Let's see what gems we can find there.

10/2 2026/09/24 04:36 tool grepper
0m Args: 
{
  "Expression": "mempool_alloc\\(",
  "PathPrefix": "include/linux/mempool.h"
}

Results: 
{
  "Output": "include/linux/mempool.h=65=void *mempool_alloc_noprof(struct mempool *pool, gfp_t gfp_mask) __malloc;\ninclude/linux/mempool.h:66:#define mempool_alloc(...)\t\t\t\t\t\t\\\ninclude/linux/mempool.h-67-\talloc_hooks(mempool_alloc_noprof(__VA_ARGS__))\n"
}
11/2 2026/09/24 04:36 llm patch-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 6338
							output: 35
							thoughts: 226

Thoughts: 
**Analyzing Memory Allocation Changes in `fs/netfs`**

Okay, so I'm looking at these recent changes in `fs/netfs/objects.c` and `rolling_buffer.c`. I see that the code used to directly call the mempool's `.alloc` function pointer. Specifically, I'm seeing instances like `rreq = mempool->alloc(gfp, mempool->pool_data);`, `subreq = mempool->alloc(rreq->gfp, mempool->pool_data);`, and `fq = netfs_folioq_pool.alloc(gfp, netfs_folioq_pool.pool_data);`. The problem, it seems, is that by directly calling `.alloc`, we were bypassing the `mempool_alloc` wrapper. And what's the significance of that? Ah, right, we weren't getting the benefits of `alloc_hooks(...)` when allocating from the mempool. It appears this was to bypass the mempool emergency reserve pool when `gfp == GFP_KERNEL` or something similar, but it had the undesirable side effect of skipping the important allocation hooks.

Now, with this change, `alloc_hooks` is being used. It's setting up `DEFINE_ALLOC_TAG(_alloc_tag)` and then calling `alloc_hooks_tag`. This is crucial for tracking and managing memory allocations more effectively. But I need to fully understand the impact.

Let me quickly check `netfs/objects.c` around line 34 and line 214. I'll get a clearer picture of how these changes ripple through the code. I need to see what's now using these hooks. Is this going to require any adjustments to our own tooling, or will it be straightforward? Let's take a look.

12/2 2026/09/24 04:36 tool read-file
0m Args: 
{
  "File": "fs/netfs/objects.c",
  "FirstLine": 20,
  "LineCount": 40
}

Results: 
{
  "Contents": "  20:\t\t\t\t\t\t     enum netfs_io_origin origin)\n  21:\t{\n  22:\t\tstatic atomic_t debug_ids;\n  23:\t\tstruct inode *inode = file ? file_inode(file) : mapping-\u003ehost;\n  24:\t\tstruct netfs_inode *ctx = netfs_inode(inode);\n  25:\t\tstruct netfs_io_request *rreq;\n  26:\t\tmempool_t *mempool = ctx-\u003eops-\u003erequest_pool ?: \u0026netfs_request_pool;\n  27:\t\tstruct kmem_cache *cache = mempool-\u003epool_data;\n  28:\t\tgfp_t gfp = GFP_KERNEL;\n  29:\t\tint ret;\n  30:\t\n  31:\t\t/* Writeback is part of memory reclaim and must not fail due to ENOMEM. */\n  32:\t\tif (origin == NETFS_WRITEBACK || origin == NETFS_WRITEBACK_SINGLE) {\n  33:\t\t\tgfp = GFP_NOFS; /* Allows use of mempools. */\n  34:\t\n  35:\t\t\trreq = mempool_alloc(mempool, gfp);\n  36:\t\t} else {\n  37:\t\t\trreq = netfs_mempool_alloc_noreserve(mempool, gfp);\n  38:\t\t\tif (!rreq)\n  39:\t\t\t\treturn ERR_PTR(-ENOMEM);\n  40:\t\t}\n  41:\t\n  42:\t\tmemset(rreq, 0, kmem_cache_size(cache));\n  43:\t\tINIT_WORK(\u0026rreq-\u003ecleanup_work, netfs_free_request);\n  44:\t\trreq-\u003egfp\t\t= gfp;\n  45:\t\trreq-\u003estart\t\t= start;\n  46:\t\trreq-\u003ecollected_to\t= start;\n  47:\t\trreq-\u003ecleaned_to\t= start;\n  48:\t\trreq-\u003elen\t\t= len;\n  49:\t\trreq-\u003eprogress_at\t= 0;\n  50:\t\trreq-\u003eorigin\t\t= origin;\n  51:\t\trreq-\u003enetfs_ops\t\t= ctx-\u003eops;\n  52:\t\trreq-\u003emapping\t\t= mapping;\n  53:\t\trreq-\u003einode\t\t= inode;\n  54:\t\trreq-\u003ei_size\t\t= i_size_read(inode);\n  55:\t\trreq-\u003edebug_id\t\t= atomic_inc_return(\u0026debug_ids);\n  56:\t\trreq-\u003ewsize\t\t= INT_MAX;\n  57:\t\trreq-\u003eio_streams[0].sreq_max_len = ULONG_MAX;\n  58:\t\trreq-\u003eio_streams[0].sreq_max_segs = 0;\n  59:\t\tspin_lock_init(\u0026rreq-\u003elock);\n"
}
13/2 2026/09/24 04:36 llm patch-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 7694
							output: 36
							thoughts: 20

Thoughts: 
Okay, here's my take on those thoughts, tailored for an expert audience:

**Diving into `fs/netfs/objects.c` – Line 214**

Alright, time to get granular. The symptom is pointing me in the direction of the networking file system layer, which naturally means I need to drill into `fs/netfs/objects.c`. I'm immediately homing in on line 214. I've got a hunch – based on the general area of the reported problem – that something specific is happening there with respect to object handling. Either a memory issue, a race condition with lock contention, or perhaps a subtle integer overflow, or some sort of subtle file locking problem is my suspicion at this point. Time to take a closer look and confirm that hypothesis, or discard it. From here, I'll analyze the surrounding code and see if the context provides any useful clues.

14/2 2026/09/24 04:36 tool read-file
0m Args: 
{
  "File": "fs/netfs/objects.c",
  "FirstLine": 205,
  "LineCount": 30
}

Results: 
{
  "Contents": " 205:\t}\n 206:\t\n 207:\t/*\n 208:\t * Allocate and partially initialise an I/O request structure.\n 209:\t */\n 210:\tstruct netfs_io_subrequest *netfs_alloc_subrequest(struct netfs_io_request *rreq)\n 211:\t{\n 212:\t\tstruct netfs_io_subrequest *subreq;\n 213:\t\tmempool_t *mempool = rreq-\u003enetfs_ops-\u003esubrequest_pool ?: \u0026netfs_subrequest_pool;\n 214:\t\tstruct kmem_cache *cache = mempool-\u003epool_data;\n 215:\t\n 216:\t\tif (rreq-\u003egfp == GFP_KERNEL)\n 217:\t\t\tsubreq = netfs_mempool_alloc_noreserve(mempool, rreq-\u003egfp);\n 218:\t\telse\n 219:\t\t\tsubreq = mempool_alloc(mempool, rreq-\u003egfp);\n 220:\t\tif (!subreq)\n 221:\t\t\treturn NULL;\n 222:\t\n 223:\t\tmemset(subreq, 0, kmem_cache_size(cache));\n 224:\t\tINIT_WORK(\u0026subreq-\u003ework, NULL);\n 225:\t\tINIT_LIST_HEAD(\u0026subreq-\u003erreq_link);\n 226:\t\trefcount_set(\u0026subreq-\u003eref, 2);\n 227:\t\tsubreq-\u003erreq = rreq;\n 228:\t\tsubreq-\u003edebug_index = atomic_inc_return(\u0026rreq-\u003esubreq_counter);\n 229:\t\tnetfs_get_request(rreq, netfs_rreq_trace_get_subreq);\n 230:\t\tnetfs_stat(\u0026netfs_n_rh_sreq);\n 231:\t\treturn subreq;\n 232:\t}\n 233:\t\n 234:\tvoid netfs_get_subrequest(struct netfs_io_subrequest *subreq,\n"
}
15/2 2026/09/24 04:36 llm patch-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 8482
							output: 37
							thoughts: 16

Thoughts: 
Okay, let's dive into this. Here's my thought process on this one:

**Investigating `fs/netfs/rolling_buffer.c`**

Alright, I'm thinking, where do I start with this network file system issue? Okay, first things first, let's take a look at the code. Specifically, let's examine the `fs/netfs/rolling_buffer.c` file. This is the place to start, as a rolling buffer seems like a very likely candidate to cause some issues related to network filesystems. Let's see what we can find. I expect to find some interesting logic related to data buffering and I am hoping for some insight into what the code is attempting to achieve in network file IO, or potential errors. This is the obvious starting point. Now, let's get into the code and see what surprises it holds.

16/2 2026/09/24 04:36 tool read-file
0m Args: 
{
  "File": "fs/netfs/rolling_buffer.c",
  "FirstLine": 15,
  "LineCount": 40
}

Results: 
{
  "Contents": "  15:\tstatic atomic_t debug_ids;\n  16:\t\n  17:\t/**\n  18:\t * netfs_folioq_alloc - Allocate a folio_queue struct\n  19:\t * @rreq_id: Associated debugging ID for tracing purposes\n  20:\t * @gfp: Allocation constraints\n  21:\t * @trace: Trace tag to indicate the purpose of the allocation\n  22:\t *\n  23:\t * Allocate, initialise and account the folio_queue struct and log a trace line\n  24:\t * to mark the allocation.\n  25:\t */\n  26:\tstruct folio_queue *netfs_folioq_alloc(unsigned int rreq_id, gfp_t gfp,\n  27:\t\t\t\t\t       unsigned int /*enum netfs_folioq_trace*/ trace)\n  28:\t{\n  29:\t\tstruct folio_queue *fq;\n  30:\t\n  31:\t\tif (gfp == GFP_KERNEL)\n  32:\t\t\tfq = netfs_mempool_alloc_noreserve(\u0026netfs_folioq_pool, gfp);\n  33:\t\telse\n  34:\t\t\tfq = mempool_alloc(\u0026netfs_folioq_pool, gfp);\n  35:\t\tif (fq) {\n  36:\t\t\tnetfs_stat(\u0026netfs_n_folioq);\n  37:\t\t\tfolioq_init(fq, rreq_id);\n  38:\t\t\tfq-\u003edebug_id = atomic_inc_return(\u0026debug_ids);\n  39:\t\t\ttrace_netfs_folioq(fq, trace);\n  40:\t\t}\n  41:\t\treturn fq;\n  42:\t}\n  43:\tEXPORT_SYMBOL(netfs_folioq_alloc);\n  44:\t\n  45:\t/**\n  46:\t * netfs_folioq_free - Free a folio_queue struct\n  47:\t * @folioq: The object to free\n  48:\t * @trace: Trace tag to indicate which free\n  49:\t *\n  50:\t * Free and unaccount the folio_queue struct.\n  51:\t */\n  52:\tvoid netfs_folioq_free(struct folio_queue *folioq,\n  53:\t\t\t       unsigned int /*enum netfs_trace_folioq*/ trace)\n  54:\t{\n"
}
17/2 2026/09/24 04:36 llm patch-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 9315
							output: 19
							thoughts: 61

Thoughts: 
Okay, let's see what's leaning on `netfs`. I need to figure out which filesystems are leveraging this, so I'm thinking: is it AFS, CIFS/SMB, Ceph, 9P, or NFS? Right, those are the usual suspects.

Now, to nail down the precise dependencies within the kernel, I'll need to do a little digging. I'll reach for `grep` and search within the `fs/` directory for any instances that might `select` or `depend on` `NETFS_SUPPORT`. That should give me a pretty clear picture of which filesystems are directly tied to that particular configuration option. I'm after the direct links here, not just mentions of those filesystems, but how the kernel is connecting those filesystem implementations to the `NETFS_SUPPORT` configuration option.

18/2 2026/09/24 04:36 tool grepper
0m Args: 
{
  "Expression": "select NETFS_SUPPORT"
}

Results: 
{
  "Output": "fs/9p/Kconfig=2=config 9P_FS\n--\nfs/9p/Kconfig-4-\tdepends on NET_9P\nfs/9p/Kconfig:5:\tselect NETFS_SUPPORT\nfs/9p/Kconfig-6-\thelp\n--\nfs/afs/Kconfig=2=config AFS_FS\n--\nfs/afs/Kconfig-6-\tselect DNS_RESOLVER\nfs/afs/Kconfig:7:\tselect NETFS_SUPPORT\nfs/afs/Kconfig-8-\tselect CRYPTO_KRB5\n--\nfs/ceph/Kconfig=2=config CEPH_FS\n--\nfs/ceph/Kconfig-5-\tselect CEPH_LIB\nfs/ceph/Kconfig:6:\tselect NETFS_SUPPORT\nfs/ceph/Kconfig-7-\tselect FS_ENCRYPTION_ALGS if FS_ENCRYPTION\n--\nfs/nfs/Kconfig=173=config NFS_FSCACHE\n--\nfs/nfs/Kconfig-175-\tdepends on NFS_FS\nfs/nfs/Kconfig:176:\tselect NETFS_SUPPORT\nfs/nfs/Kconfig-177-\tselect FSCACHE\n--\nfs/smb/client/Kconfig=2=config CIFS\n--\nfs/smb/client/Kconfig-20-\tselect OID_REGISTRY\nfs/smb/client/Kconfig:21:\tselect NETFS_SUPPORT\nfs/smb/client/Kconfig-22-\thelp\n--\nnet/9p/Kconfig=6=menuconfig NET_9P\nnet/9p/Kconfig-7-\ttristate \"Plan 9 Resource Sharing Support (9P2000)\"\nnet/9p/Kconfig:8:\tselect NETFS_SUPPORT\nnet/9p/Kconfig-9-\thelp\n"
}
19/2 2026/09/24 04:36 llm patch-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 10032
							output: 29
							thoughts: 557

Thoughts: 
**Analyzing a NetFS Memory Allocation Patch**

Okay, so I'm looking at this patch related to network filesystems, specifically focusing on how it impacts memory allocation within the NetFS layer. My initial thought is that NetFS uses a bunch of network filesystems, like 9p, AFS, Ceph, NFS, and CIFS, which all rely on NETFS_SUPPORT. Good, and since syzkaller is a fantastic fuzzer, I know it can easily poke at 9p, be it via virtio-9p or loopback/socket, because it already has descriptions for mounting 9p and emulating 9p servers.

My immediate question is, how reachable is the `netfs_alloc_request` function, and by extension, is NetFS itself reachable? The answer is yes, because NETFS is in the VFS/filesystem core, which these network filesystems use. Then I start thinking, can you even mount 9p without specific hardware? Of course, you can! 9P supports mounts through `trans=fd` or virtio in QEMU. That's good coverage for fuzzing.

I then check if syzkaller is hitting 9p. Yes, it does, because it regularly tests 9p mounts and filesystem operations.

Right, back to the patch. Let's dig in. I see `fs/netfs/internal.h` has this:

```c
#define netfs_mempool_alloc_noreserve(_pool, _gfp) \
	alloc_hooks((_pool)->alloc(_gfp, (_pool)->pool_data))
```

So, what's changed? The code is now using `alloc_hooks()` around the mempool allocation. This hints at something related to memory allocation profiling (`CONFIG_MEM_ALLOC_PROFILING`).

I'm starting to get it. When memory allocation profiling is enabled, functions like `kmalloc`, `kmem_cache_alloc`, and `mempool_alloc` are wrapped with `alloc_hooks()`. This mechanism tracks allocation tags and attributes the allocation to the caller.

Previously, in NetFS, when `rreq->gfp == GFP_KERNEL` or `origin != NETFS_WRITEBACK`, they were directly calling `mempool->alloc(gfp, mempool->pool_data)`. The problem is that because `mempool->alloc` was a raw function pointer (pointing to something like `mempool_alloc_slab` or `mempool_kmalloc`), calling it directly bypassed `alloc_hooks()`!

So, the issue is, what happens if we *don't* call `alloc_hooks()` when profiling is enabled? Does it just add memory allocation profiling hooks? Does it cause a bug/warning? I need to check how `mempool->alloc` is initialized. Let's grep for `mempool_init` or `mempool_create` in `fs/netfs`. I need to figure out what `mempool->alloc` actually points to.

20/2 2026/09/24 04:36 tool grepper
0m Error: 
no matches

Args: 
{
  "Expression": "mempool_create",
  "PathPrefix": "fs/netfs"
}

Results: 
{
  "error": "no matches"
}
21/2 2026/09/24 04:36 llm patch-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 11291
							output: 30
							thoughts: 21

Thoughts: 
Okay, here's my summarized thought process, presented as if I'm thinking it:

**Digging into the Network Filesystem Request Pool**

Alright, time to get to work. I need to understand how the network filesystem request pool is functioning, specifically within the kernel. Let's start with the basics. My initial instinct is to use `grep`. I want to find all occurrences of `netfs_request_pool`. So, I'll direct `grep` to search within the `fs/netfs/` directory. That seems like the logical place to start digging into the core network filesystem implementation details. I anticipate this will point me toward key structures or function calls related to managing these requests. Let's see what comes back. I suspect that this query will yield enough information for a solid starting point.

22/2 2026/09/24 04:36 tool grepper
0m Args: 
{
  "Expression": "netfs_request_pool",
  "PathPrefix": "fs/netfs"
}

Results: 
{
  "Output": "fs/netfs/internal.h=43=extern spinlock_t netfs_proc_lock;\nfs/netfs/internal.h:44:extern mempool_t netfs_request_pool;\nfs/netfs/internal.h-45-extern mempool_t netfs_subrequest_pool;\n--\nfs/netfs/main.c=28=static struct kmem_cache *netfs_subrequest_slab;\nfs/netfs/main.c:29:mempool_t netfs_request_pool;\nfs/netfs/main.c-30-mempool_t netfs_subrequest_pool;\n--\nfs/netfs/main.c=108=static int __init netfs_init(void)\n--\nfs/netfs/main.c-121-\nfs/netfs/main.c:122:\tif (mempool_init_slab_pool(\u0026netfs_request_pool, 100, netfs_request_slab) \u003c 0)\nfs/netfs/main.c-123-\t\tgoto error_reqpool;\n--\nfs/netfs/main.c-162-error_subreq:\nfs/netfs/main.c:163:\tmempool_exit(\u0026netfs_request_pool);\nfs/netfs/main.c-164-error_reqpool:\n--\nfs/netfs/main.c=173=static void __exit netfs_exit(void)\n--\nfs/netfs/main.c-178-\tkmem_cache_destroy(netfs_subrequest_slab);\nfs/netfs/main.c:179:\tmempool_exit(\u0026netfs_request_pool);\nfs/netfs/main.c-180-\tkmem_cache_destroy(netfs_request_slab);\n--\nfs/netfs/objects.c=17=struct netfs_io_request *netfs_alloc_request(struct address_space *mapping,\n--\nfs/netfs/objects.c-25-\tstruct netfs_io_request *rreq;\nfs/netfs/objects.c:26:\tmempool_t *mempool = ctx-\u003eops-\u003erequest_pool ?: \u0026netfs_request_pool;\nfs/netfs/objects.c-27-\tstruct kmem_cache *cache = mempool-\u003epool_data;\n--\nfs/netfs/objects.c-86-\t\tif (ret \u003c 0) {\nfs/netfs/objects.c:87:\t\t\tmempool_free(rreq, rreq-\u003enetfs_ops-\u003erequest_pool ?: \u0026netfs_request_pool);\nfs/netfs/objects.c-88-\t\t\treturn ERR_PTR(ret);\n--\nfs/netfs/objects.c=124=static void netfs_free_request_rcu(struct rcu_head *rcu)\n--\nfs/netfs/objects.c-127-\nfs/netfs/objects.c:128:\tmempool_free(rreq, rreq-\u003enetfs_ops-\u003erequest_pool ?: \u0026netfs_request_pool);\nfs/netfs/objects.c-129-\tnetfs_stat_d(\u0026netfs_n_rh_rreq);\n"
}
23/2 2026/09/24 04:36 llm patch-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 12330
							output: 29
							thoughts: 36

Thoughts: 
Here's my thought process, as requested:

**Diving into Slab Allocation Initialization**

Okay, so we're looking at `mempool_init_slab_pool`. This clearly sets up a memory pool specifically using slabs. My immediate instinct is to understand *how* it's doing that.  Let's not just take the name at face value, I need to see the implementation. I know `mm/mempool.c` is the likely location for memory pool related functions. Therefore, my next step is to examine the `mempool_alloc_slab` definition. Understanding how slabs are allocated within the pool is crucial to grasping the initialization process. That's where the real magic happens, or at least, that's where I need to start digging to understand it. I need to see the mechanism.

24/2 2026/09/24 04:36 tool grepper
0m Args: 
{
  "Expression": "mempool_alloc_slab",
  "PathPrefix": "mm/"
}

Results: 
{
  "Output": "mm/mempool.c=129=static void poison_element(struct mempool *pool, void *element)\n--\nmm/mempool.c-137-\t\t__poison_element(element, (size_t)pool-\u003epool_data);\nmm/mempool.c:138:\t} else if (pool-\u003ealloc == mempool_alloc_slab) {\nmm/mempool.c-139-\t\t__poison_element(element, kmem_cache_size(pool-\u003epool_data));\n--\nmm/mempool.c=160=static __always_inline bool kasan_poison_element(struct mempool *pool,\n--\nmm/mempool.c-162-{\nmm/mempool.c:163:\tif (pool-\u003ealloc == mempool_alloc_slab || pool-\u003ealloc == mempool_kmalloc)\nmm/mempool.c-164-\t\treturn kasan_mempool_poison_object(element);\n--\nmm/mempool.c=171=static void kasan_unpoison_element(struct mempool *pool, void *element)\n--\nmm/mempool.c-174-\t\tkasan_mempool_unpoison_object(element, (size_t)pool-\u003epool_data);\nmm/mempool.c:175:\telse if (pool-\u003ealloc == mempool_alloc_slab)\nmm/mempool.c-176-\t\tkasan_mempool_unpoison_object(element,\n--\nmm/mempool.c=719=EXPORT_SYMBOL(mempool_free);\n--\nmm/mempool.c-723- */\nmm/mempool.c:724:void *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data)\nmm/mempool.c-725-{\n--\nmm/mempool.c-729-}\nmm/mempool.c:730:EXPORT_SYMBOL(mempool_alloc_slab);\nmm/mempool.c-731-\n"
}
25/2 2026/09/24 04:36 llm patch-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 13101
							output: 35
							thoughts: 29

Thoughts: 
Okay, here's my take on those thoughts, tailored for an expert audience:

**Diving into `mempool_alloc_slab` in mm/mempool.c**

Alright, let's take a look at `mempool_alloc_slab`. I'm going to focus in on line 724 in `mm/mempool.c`. My initial thought is to probably check that line out for any potential issues with slab allocation. I want to see how it interacts with the underlying slab allocator, specifically how it handles potential allocation failures or race conditions in that context. Given the function's name, I’m guessing this is where the mempool is attempting to retrieve a slab to fulfill a request. I'll be looking for nuances in how it handles those slab allocations, especially the error handling, and whether it's doing anything clever (or potentially problematic) with locking or retries if the initial slab allocation fails. I'm also curious about its interaction with the mempool's internal state – does it update counters correctly, handle slab depletion gracefully, and so on? I want to see if there are any obvious pitfalls, like potential livelocks or unbounded retries, or anything that could cause contention in a heavily loaded system. Let's see what’s there!

26/2 2026/09/24 04:36 tool read-file
0m Args: 
{
  "File": "mm/mempool.c",
  "FirstLine": 720,
  "LineCount": 20
}

Results: 
{
  "Contents": " 720:\t\n 721:\t/*\n 722:\t * A commonly used alloc and free fn.\n 723:\t */\n 724:\tvoid *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data)\n 725:\t{\n 726:\t\tstruct kmem_cache *mem = pool_data;\n 727:\t\tVM_BUG_ON(mem-\u003ector);\n 728:\t\treturn kmem_cache_alloc_noprof(mem, gfp_mask);\n 729:\t}\n 730:\tEXPORT_SYMBOL(mempool_alloc_slab);\n 731:\t\n 732:\tvoid mempool_free_slab(void *element, void *pool_data)\n 733:\t{\n 734:\t\tstruct kmem_cache *mem = pool_data;\n 735:\t\tkmem_cache_free(mem, element);\n 736:\t}\n 737:\tEXPORT_SYMBOL(mempool_free_slab);\n 738:\t\n 739:\t/*\n"
}
27/2 2026/09/24 04:36 llm patch-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 13740
							output: 22
							thoughts: 1830

Thoughts: 
**Fuzzing Decision for Netfs Memory Allocation Changes**

Okay, so I'm looking at this patch and trying to decide if it warrants fuzzing. Initially, I noticed `mempool_alloc_slab` directly calls `kmem_cache_alloc_noprof`, bypassing the usual allocation tagging through `alloc_hooks`. The original code in `netfs` used `mempool->alloc` directly, which meant the memory allocation wasn't getting properly profiled. The patch introduces `netfs_mempool_alloc_noreserve` which now wraps the allocation with `alloc_hooks`.

My immediate thought is, "Is this a functional change?" and "Is it reachable?". I need to carefully apply the fuzzing guidelines.

Let's break this down systematically. I recall the guidelines: We should fuzz if there are refactorings, especially if they touch core subsystems. I immediately think that `fs/netfs/` must be related to core filesystem handling.

The guidelines warn against blindly trusting "no functional change" claims, because refactorings can introduce subtle shifts. Furthermore, changes to allocation tagging, even if seemingly just for profiling, can expose latent bugs. And memory management is definitely a core subsystem!

But what does `alloc_hooks` *do*? I'm now looking at the macro definition again. It turns out, that when `CONFIG_MEM_ALLOC_PROFILING` is enabled, `alloc_hooks` *manipulates the current task's allocation tag pointer* via `alloc_tag_save` and `alloc_tag_restore`. Even if profiling is disabled, evaluating `(_pool)->alloc(_gfp, (_pool)->pool_data)` is certainly an executable code. Furthermore, *netfs* is part of VFS/filesystems, a core subsystem.

The changes involve `fs/netfs/objects.c`, `fs/netfs/rolling_buffer.c`, and `fs/netfs/internal.h`. These are all kernel C files. This doesn't fall into the negative criteria – they're not documentation, not userspace, not purely decorative logging (it's memory allocation accounting hooks), not unreachable hardware, not driver teardown callbacks, not architecture-specific. And, yes, netfs *is* reachable in standard virtualized environments. I can test this in QEMU with 9p mounts and similar configurations.

Therefore, because this touches reachable, executable code in a core subsystem (filesystem handling) and potentially modifies memory allocation behavior and allocation metadata, I must conclude this *must* be fuzzed.

28/2 2026/09/24 04:36 tool grepper
0m Args: 
{
  "Expression": "config MEM_ALLOC_PROFILING"
}

Results: 
{
  "Output": "mm/Kconfig.debug=311=config PER_VMA_LOCK_STATS\n--\nmm/Kconfig.debug-323-\nmm/Kconfig.debug:324:config MEM_ALLOC_PROFILING\nmm/Kconfig.debug-325-\tbool \"Enable memory allocation profiling\"\n--\nmm/Kconfig.debug-336-\nmm/Kconfig.debug:337:config MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT\nmm/Kconfig.debug-338-\tbool \"Enable memory allocation profiling by default\"\n--\nmm/Kconfig.debug-341-\nmm/Kconfig.debug:342:config MEM_ALLOC_PROFILING_DEBUG\nmm/Kconfig.debug-343-\tbool \"Memory allocation profiler debugging\"\n"
}
29/2 2026/09/24 04:37 llm patch-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 16347
							output: 34
							thoughts: 19

Thoughts: 
Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Debugging Kernel Configuration Options**

Okay, so I'm diving into a configuration issue, and a hunch tells me the problem likely resides in the debug options. My first step is to zero in on `mm/Kconfig.debug`. I'm specifically interested in the vicinity of line 324, give or take a few lines. That's usually where the more granular memory management debug options are defined. I expect to find some likely suspects there: maybe a conditional based on a particular architecture, a dependency on a different Kconfig symbol, or even a subtle typo that's throwing things off. I'm going to scan that area very carefully, looking for anything that jumps out as a potential cause for my configuration problem. It's a targeted approach; hopefully this will get me where I need to be quickly.

30/2 2026/09/24 04:37 tool read-file
0m Args: 
{
  "File": "mm/Kconfig.debug",
  "FirstLine": 320,
  "LineCount": 35
}

Results: 
{
  "Contents": " 320:\t\t  overhead in the page fault path.\n 321:\t\n 322:\t\t  If in doubt, say N.\n 323:\t\n 324:\tconfig MEM_ALLOC_PROFILING\n 325:\t\tbool \"Enable memory allocation profiling\"\n 326:\t\tdefault n\n 327:\t\tdepends on MMU\n 328:\t\tdepends on PROC_FS\n 329:\t\tselect CODE_TAGGING\n 330:\t\tselect PAGE_EXTENSION\n 331:\t\tselect SLAB_OBJ_EXT\n 332:\t\thelp\n 333:\t\t  Track allocation source code and record total allocation size\n 334:\t\t  initiated at that code location. The mechanism can be used to track\n 335:\t\t  memory leaks with a low performance and memory impact.\n 336:\t\n 337:\tconfig MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT\n 338:\t\tbool \"Enable memory allocation profiling by default\"\n 339:\t\tdefault y\n 340:\t\tdepends on MEM_ALLOC_PROFILING\n 341:\t\n 342:\tconfig MEM_ALLOC_PROFILING_DEBUG\n 343:\t\tbool \"Memory allocation profiler debugging\"\n 344:\t\tdefault n\n 345:\t\tdepends on MEM_ALLOC_PROFILING\n 346:\t\tselect MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT\n 347:\t\thelp\n 348:\t\t  Adds warnings with helpful error messages for memory allocation\n 349:\t\t  profiling.\n"
}
31/2 2026/09/24 04:37 llm patch-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 16998
							output: 19
							thoughts: 92

Thoughts: 
Okay, here's my take on those thoughts, tailored for an expert audience:

**Memory Allocation Profiling Debug Dive**

Right, so I see they've cleverly added some warnings with error messages tied to `MEM_ALLOC_PROFILING_DEBUG`. Nice, that's immediately useful for catching issues during profiling. My first instinct is to explore the ramifications of enabling profiling *without* hooking the allocator; that could be a significant edge case to consider. What kind of instrumentation or potential side effects are in play?

Next, I need to get a handle on what's actually *happening* under the hood. Specifically, I'll hop over to `alloc_tag.h`. I want to understand the mechanics of `alloc_tag_save` and `alloc_tag_restore`. Are we talking about context saving, perhaps metadata preservation, or something else entirely? And given that, I'll need to see how slab allocation is impacted when `CONFIG_MEM_ALLOC_PROFILING` is toggled. Are we patching the slab allocators directly, instrumenting them, or is the integration more layered? That's where the real juice is in understanding the profiling's overhead and accuracy. Time to dig in!

32/2 2026/09/24 04:37 tool grepper
0m Args: 
{
  "Expression": "alloc_tag_save"
}

Results: 
{
  "Output": "include/linux/alloc_tag.h=249=static inline bool alloc_tag_is_inaccurate(struct alloc_tag *tag) { return false; }\n--\ninclude/linux/alloc_tag.h-258-\t\tstruct alloc_tag * __maybe_unused _old;\t\t\t\\\ninclude/linux/alloc_tag.h:259:\t\t_old = alloc_tag_save(_tag);\t\t\t\t\\\ninclude/linux/alloc_tag.h-260-\t\t_res = _do_alloc;\t\t\t\t\t\\\n--\ninclude/linux/sched.h=2356=extern void sched_set_stop_task(int cpu, struct task_struct *stop);\n--\ninclude/linux/sched.h-2358-#ifdef CONFIG_MEM_ALLOC_PROFILING\ninclude/linux/sched.h:2359:static __always_inline struct alloc_tag *alloc_tag_save(struct alloc_tag *tag)\ninclude/linux/sched.h-2360-{\n--\ninclude/linux/sched.h=2365=static __always_inline void alloc_tag_restore(struct alloc_tag *tag, struct alloc_tag *old)\n--\ninclude/linux/sched.h-2372-#else\ninclude/linux/sched.h:2373:#define alloc_tag_save(_tag)\t\t\tNULL\ninclude/linux/sched.h-2374-#define alloc_tag_restore(_tag, _old)\t\tdo {} while (0)\n"
}
33/2 2026/09/24 04:37 llm patch-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 17735
							output: 36
							thoughts: 19

Thoughts: 
Here's my take on those thoughts:

**Peering into the Scheduler's Heart**

Alright, let's dive into the guts of this scheduler. Line 2359 of `sched.h`, eh? That's usually a pretty critical region. My initial thought is to brace myself, because that part of the code is probably handling something fundamental, something that likely touches on context switching, task scheduling decisions, or perhaps even resource allocation. I'm already anticipating potentially complex data structures and intricate logic, maybe even some optimization attempts. Given the line number, I'm guessing this isn't a simple conditional; it’s likely a core component. Time to put on my investigator's hat and get digging.

34/2 2026/09/24 04:37 tool read-file
0m Args: 
{
  "File": "include/linux/sched.h",
  "FirstLine": 2355,
  "LineCount": 25
}

Results: 
{
  "Contents": "2355:\t\n2356:\textern void sched_set_stop_task(int cpu, struct task_struct *stop);\n2357:\t\n2358:\t#ifdef CONFIG_MEM_ALLOC_PROFILING\n2359:\tstatic __always_inline struct alloc_tag *alloc_tag_save(struct alloc_tag *tag)\n2360:\t{\n2361:\t\tswap(current-\u003ealloc_tag, tag);\n2362:\t\treturn tag;\n2363:\t}\n2364:\t\n2365:\tstatic __always_inline void alloc_tag_restore(struct alloc_tag *tag, struct alloc_tag *old)\n2366:\t{\n2367:\t#ifdef CONFIG_MEM_ALLOC_PROFILING_DEBUG\n2368:\t\tWARN(current-\u003ealloc_tag != tag, \"current-\u003ealloc_tag was changed:\\n\");\n2369:\t#endif\n2370:\t\tcurrent-\u003ealloc_tag = old;\n2371:\t}\n2372:\t#else\n2373:\t#define alloc_tag_save(_tag)\t\t\tNULL\n2374:\t#define alloc_tag_restore(_tag, _old)\t\tdo {} while (0)\n2375:\t#endif\n2376:\t\n2377:\t/* Avoids recursive inclusion hell */\n2378:\t#ifdef CONFIG_SCHED_MM_CID\n2379:\tvoid sched_mm_cid_before_execve(struct task_struct *t);\n"
}
35/2 2026/09/24 04:37 llm patch-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 18344
							output: 32
							thoughts: 245

Thoughts: 
**Analyzing the Allocation Tagging System**

Okay, let's dive into this `alloc_tag_restore` function. I see a `WARN` call in there, specifically when `CONFIG_MEM_ALLOC_PROFILING_DEBUG` is defined. This immediately flags that something is keeping track of allocation tags, and this macro must be related to debugging allocation changes, which makes sense.

So, when `alloc_hooks` are engaged, it sets `current->alloc_tag` to this `&_alloc_tag`, calls `_do_alloc`, and then crucially, *restores* it. This suggests some kind of scoped allocation tracking, which could be useful for profiling. That `WARN` check indicates a sanity check, ensuring the tag hasn't been altered during the process.

Now, let's consider the slab allocator. Ah, yes, I remember this. When allocating a slab object, it *attaches* the `current->alloc_tag` to the object itself. And on the `free` side, depending on `CONFIG_MEM_ALLOC_PROFILING`, there's either a check or a clearing of the tag. This directly ties the allocation tag information to the lifespan of objects in the slab cache. This means this is directly influencing the allocation tagging and memory allocation profiler assertions!

Now, what configuration options are involved? I need to check the dependencies. Let's start with `NETFS_SUPPORT` and its related configuration options. I see that `fs/netfs` is built with `CONFIG_NETFS_SUPPORT` enabled. Okay, let's examine the `fs/netfs/Makefile` to see how it's integrated with this system.

36/2 2026/09/24 04:37 tool read-file
0m Args: 
{
  "File": "fs/netfs/Makefile",
  "FirstLine": 1,
  "LineCount": 25
}

Results: 
{
  "Contents": "   1:\t# SPDX-License-Identifier: GPL-2.0\n   2:\t\n   3:\tnetfs-y := \\\n   4:\t\tbuffered_read.o \\\n   5:\t\tbuffered_write.o \\\n   6:\t\tdirect_read.o \\\n   7:\t\tdirect_write.o \\\n   8:\t\titerator.o \\\n   9:\t\tlocking.o \\\n  10:\t\tmain.o \\\n  11:\t\tmisc.o \\\n  12:\t\tobjects.o \\\n  13:\t\tread_collect.o \\\n  14:\t\tread_pgpriv2.o \\\n  15:\t\tread_retry.o \\\n  16:\t\tread_single.o \\\n  17:\t\trolling_buffer.o \\\n  18:\t\twrite_collect.o \\\n  19:\t\twrite_issue.o \\\n  20:\t\twrite_retry.o\n  21:\t\n  22:\tnetfs-$(CONFIG_NETFS_STATS) += stats.o\n  23:\t\n  24:\tnetfs-$(CONFIG_FSCACHE) += \\\n  25:\t\tfscache_cache.o \\\n"
}
37/2 2026/09/24 04:37 llm patch-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 19278
							output: 25
							thoughts: 13

Thoughts: 
Okay, here's my take on those thoughts, tailored for an expert audience:

**Investigating the Netfs Integration Point**

Right, let's dive straight in. My immediate thought is to zero in on `fs/Makefile`. That's the logical place to start when tracking down how netfs, whatever specific implementation we're dealing with, gets built and incorporated into the kernel. The Makefile is, after all, the conductor of the orchestra, so to speak. It defines dependencies, build rules, and usually, how modules are linked. I'm expecting to find either a specific `obj-$(CONFIG_NETFS) += ...` line, or perhaps an indirect inclusion via a more generic `fs/Kconfig` file that deals with a broader feature set. The aim here isn't a casual scan, but a directed search for the build instructions for netfs. I'm looking for the mechanisms by which the netfs components are compiled, linked, and ultimately, incorporated into the relevant filesystem infrastructure. This is about understanding the build process, the dependencies, and any conditional compilation that might be in play. Ultimately I'm trying to work out how netfs comes to exist within the kernel image and how any associated modules are structured.

38/2 2026/09/24 04:37 tool grepper
0m Args: 
{
  "Expression": "netfs",
  "PathPrefix": "fs/Makefile"
}

Results: 
{
  "Output": "fs/Makefile=61=obj-$(CONFIG_DLM)\t\t+= dlm/\n--\nfs/Makefile-63-# Do not add any filesystems before this line\nfs/Makefile:64:obj-$(CONFIG_NETFS_SUPPORT)\t+= netfs/\nfs/Makefile-65-obj-$(CONFIG_EXT4_FS)\t\t+= ext4/\n"
}
39/2 2026/09/24 04:37 llm patch-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 19673
							output: 33
							thoughts: 466

Thoughts: 
**Analyzing the NETFS_SUPPORT Configuration Option**

Okay, so I'm looking at `CONFIG_NETFS_SUPPORT`. It's tristate (or boolean if the code allows), but usually it's indirectly selected by filesystems like `9P_FS`. The first question is, can a user select `NETFS_SUPPORT` directly? Time to check `fs/netfs/Kconfig`. Ah, here it is:

```kconfig
config NETFS_SUPPORT
	tristate
```

No prompt string! That means a user can't manually enable it in `menuconfig` unless some other configuration option selects it. Which brings us to the next question, what *does* select `NETFS_SUPPORT`? Let's see: `9P_FS`, `AFS_FS`, `CEPH_FS`, `CIFS`, `NFS_FSCACHE`, and `NET_9P`.

Hold on, let's look at `net/9p/Kconfig`. Yep, there's a `menuconfig NET_9P` and it `select`s `NETFS_SUPPORT`. And, as expected, `9P_FS` depends on `NET_9P` and also selects `NETFS_SUPPORT`.

Let's do a quick check on the `MEM_ALLOC_PROFILING` config:

```kconfig
config MEM_ALLOC_PROFILING
	bool "Enable memory allocation profiling"
```

Yes! That has a prompt. `MEM_ALLOC_PROFILING_DEBUG` also has a prompt.

Now, a critical thought: can `NETFS_SUPPORT` actually build if I set `CONFIG_NETFS_SUPPORT=y` in the `.config` directly? I recall Kconfig allows this for promptless symbols, as long as dependencies are met (in this case, there are *no* dependencies). However, it's best to configure both `NETFS_SUPPORT` and at least one other visible config like `9P_FS` or `NET_9P`.

Hold on, let me check the dependencies for `NET_9P` in `net/9p/Kconfig`...

40/2 2026/09/24 04:37 tool read-file
0m Args: 
{
  "File": "net/9p/Kconfig",
  "FirstLine": 1,
  "LineCount": 25
}

Results: 
{
  "Contents": "   1:\t# SPDX-License-Identifier: GPL-2.0-only\n   2:\t#\n   3:\t# 9P protocol configuration\n   4:\t#\n   5:\t\n   6:\tmenuconfig NET_9P\n   7:\t\ttristate \"Plan 9 Resource Sharing Support (9P2000)\"\n   8:\t\tselect NETFS_SUPPORT\n   9:\t\thelp\n  10:\t\t  If you say Y here, you will get experimental support for\n  11:\t\t  Plan 9 resource sharing via the 9P2000 protocol.\n  12:\t\n  13:\t\t  See \u003chttp://v9fs.sf.net\u003e for more information.\n  14:\t\n  15:\t\t  If unsure, say N.\n  16:\t\n  17:\tif NET_9P\n  18:\t\n  19:\tconfig NET_9P_FD\n  20:\t\tdefault NET_9P\n  21:\t\timply INET\n  22:\t\timply UNIX\n  23:\t\ttristate \"9P FD Transport\"\n  24:\t\thelp\n  25:\t\t  This builds support for transports over TCP, Unix sockets and\n"
}
41/2 2026/09/24 04:37 llm patch-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 20945
							output: 33
							thoughts: 13

Thoughts: 
Okay, let's dive into it. Here's my thought process summarized, assuming I'm already well-versed in the subject:

**Analyzing the Kconfig for fs/9p**

Right, time to get a good look at `fs/9p/Kconfig`. I need to understand the configuration options for the 9P filesystem driver. I'm going to start by quickly scanning the file to identify the key settings, dependencies, and default values. I'll pay close attention to the hierarchy of the config options, how they are grouped, and any relationships they have with other parts of the kernel. Are there any conditional dependencies? What hardware or other software components is 9P reliant upon? Are there any obvious security considerations or performance trade-offs embedded in these configurations? I need to get a clear picture of how this file contributes to the overall build configuration. This will give me the information I need to make informed decisions for my specific use case.

42/2 2026/09/24 04:37 tool read-file
0m Args: 
{
  "File": "fs/9p/Kconfig",
  "FirstLine": 1,
  "LineCount": 25
}

Results: 
{
  "Contents": "   1:\t# SPDX-License-Identifier: GPL-2.0-only\n   2:\tconfig 9P_FS\n   3:\t\ttristate \"Plan 9 Resource Sharing Support (9P2000)\"\n   4:\t\tdepends on NET_9P\n   5:\t\tselect NETFS_SUPPORT\n   6:\t\thelp\n   7:\t\t  If you say Y here, you will get experimental support for\n   8:\t\t  Plan 9 resource sharing via the 9P2000 protocol.\n   9:\t\n  10:\t\t  See \u003chttp://v9fs.sf.net\u003e for more information.\n  11:\t\n  12:\t\t  If unsure, say N.\n  13:\t\n  14:\tif 9P_FS\n  15:\tconfig 9P_FSCACHE\n  16:\t\tbool \"Enable 9P client caching support\"\n  17:\t\tdepends on 9P_FS=m \u0026\u0026 FSCACHE || 9P_FS=y \u0026\u0026 FSCACHE=y\n  18:\t\thelp\n  19:\t\t  Choose Y here to enable persistent, read-only local\n  20:\t\t  caching support for 9p clients using FS-Cache\n  21:\t\n  22:\t\n  23:\tconfig 9P_FS_POSIX_ACL\n  24:\t\tbool \"9P POSIX Access Control Lists\"\n  25:\t\tselect FS_POSIX_ACL\n"
}
43/2 2026/09/24 04:37 llm patch-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 21550
							output: 30
							thoughts: 183

Thoughts: 
**Analyzing Recent Changes and Identifying Scope**

Okay, let's break this down. First, I see a list of seemingly related configurations: `NETFS_SUPPORT`, `NET_9P`, `9P_FS`, and `MEM_ALLOC_PROFILING`. I need to understand the connection, if any, and how this impacts the system. My first thought is to see if any `FocusSymbols` are relevant here.

Now, let's trace the modifications. I see three functions have been changed: `netfs_alloc_request`, `netfs_alloc_subrequest` (both in `fs/netfs/objects.c`), and `netfs_folioq_alloc` (in `fs/netfs/rolling_buffer.c`). The key question here is whether these functions are truly significant in the broader system or limited in scope.

Looks like they are specific to `netfs`:
- `netfs_alloc_request`
- `netfs_alloc_subrequest`
- `netfs_folioq_alloc`

Since these appear to be specific to the `netfs` subsystem, I can reasonably focus my investigation within that domain. Let's see where the function `netfs_alloc_request` is called. Understanding the call graph will help me narrow down the impact of these changes.

44/2 2026/09/24 04:37 tool grepper
0m Args: 
{
  "Expression": "netfs_alloc_request",
  "PathPrefix": "fs/netfs"
}

Results: 
{
  "Output": "fs/netfs/buffered_read.c=405=void netfs_readahead(struct readahead_control *ractl)\n--\nfs/netfs/buffered_read.c-413-\nfs/netfs/buffered_read.c:414:\trreq = netfs_alloc_request(ractl-\u003emapping, ractl-\u003efile, start, size,\nfs/netfs/buffered_read.c-415-\t\t\t\t   NETFS_READAHEAD);\n--\nfs/netfs/buffered_read.c=478=static int netfs_read_gaps(struct file *file, struct folio *folio)\n--\nfs/netfs/buffered_read.c-495-\nfs/netfs/buffered_read.c:496:\trreq = netfs_alloc_request(mapping, file, folio_pos(folio), flen, NETFS_READ_GAPS);\nfs/netfs/buffered_read.c-497-\tif (IS_ERR(rreq)) {\n--\nfs/netfs/buffered_read.c=587=int netfs_read_folio(struct file *file, struct folio *folio)\n--\nfs/netfs/buffered_read.c-600-\nfs/netfs/buffered_read.c:601:\trreq = netfs_alloc_request(mapping, file,\nfs/netfs/buffered_read.c-602-\t\t\t\t   folio_pos(folio), folio_size(folio),\n--\nfs/netfs/buffered_read.c=716=int netfs_write_begin(struct netfs_inode *ctx,\n--\nfs/netfs/buffered_read.c-755-\nfs/netfs/buffered_read.c:756:\trreq = netfs_alloc_request(mapping, file,\nfs/netfs/buffered_read.c-757-\t\t\t\t   folio_pos(folio), folio_size(folio),\n--\nfs/netfs/buffered_read.c=808=int netfs_prefetch_for_write(struct file *file, struct folio *folio,\n--\nfs/netfs/buffered_read.c-821-\nfs/netfs/buffered_read.c:822:\trreq = netfs_alloc_request(mapping, file, start, flen,\nfs/netfs/buffered_read.c-823-\t\t\t\t   NETFS_READ_FOR_WRITE);\n--\nfs/netfs/direct_read.c=153=ssize_t netfs_unbuffered_read_iter_locked(struct kiocb *iocb, struct iov_iter *iter)\n--\nfs/netfs/direct_read.c-169-\nfs/netfs/direct_read.c:170:\trreq = netfs_alloc_request(iocb-\u003eki_filp-\u003ef_mapping, iocb-\u003eki_filp,\nfs/netfs/direct_read.c-171-\t\t\t\t   iocb-\u003eki_pos, orig_count,\n--\nfs/netfs/internal.h=85=void netfs_wait_for_put_ra_refs(struct netfs_io_request *rreq);\n--\nfs/netfs/internal.h-89- */\nfs/netfs/internal.h:90:struct netfs_io_request *netfs_alloc_request(struct address_space *mapping,\nfs/netfs/internal.h-91-\t\t\t\t\t     struct file *file,\n--\nfs/netfs/objects.c=12=static void netfs_free_request(struct work_struct *work);\n--\nfs/netfs/objects.c-16- */\nfs/netfs/objects.c:17:struct netfs_io_request *netfs_alloc_request(struct address_space *mapping,\nfs/netfs/objects.c-18-\t\t\t\t\t     struct file *file,\n--\nfs/netfs/objects.c=193=void netfs_put_failed_request(struct netfs_io_request *rreq)\n--\nfs/netfs/objects.c-197-\t/* new requests have two references (see\nfs/netfs/objects.c:198:\t * netfs_alloc_request(), and this function is only allowed on\nfs/netfs/objects.c-199-\t * new request objects\n--\nfs/netfs/read_single.c=162=ssize_t netfs_read_single(struct inode *inode, struct file *file, struct iov_iter *iter)\n--\nfs/netfs/read_single.c-167-\nfs/netfs/read_single.c:168:\trreq = netfs_alloc_request(inode-\u003ei_mapping, file, 0, iov_iter_count(iter),\nfs/netfs/read_single.c-169-\t\t\t\t   NETFS_READ_SINGLE);\n--\nfs/netfs/write_issue.c=90=struct netfs_io_request *netfs_create_write_req(struct address_space *mapping,\n--\nfs/netfs/write_issue.c-101-\nfs/netfs/write_issue.c:102:\twreq = netfs_alloc_request(mapping, file, start, 0, origin);\nfs/netfs/write_issue.c-103-\tif (IS_ERR(wreq))\n"
}
45/2 2026/09/24 04:37 llm patch-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 23384
							output: 212
							thoughts: 483

Thoughts: 
**Netfs Allocation Changes: A Deep Dive**

Okay, so I've been digging into these netfs changes and it's pretty clear that `netfs_alloc_request`, `netfs_alloc_subrequest`, and `netfs_folioq_alloc` are the key allocation functions impacted. They're definitely the core of the modifications. Let's see... I've confirmed that these are the symbols where the code got altered.

I did a quick diff check, just to be thorough. The changes are located in `fs/netfs/internal.h` (specifically the macro `#define netfs_mempool_alloc_noreserve(_pool, _gfp)`), `fs/netfs/objects.c` (where `netfs_alloc_request` and `netfs_alloc_subrequest` live), and `fs/netfs/rolling_buffer.c` (`netfs_folioq_alloc`). They are all non-static, exported symbols within netfs. That's good, that confirms what I suspected.

I also checked to see if any other files or functions were touched, but the diff only shows those three files. That's a good sign, keeps things focused.

Now, let's look at the associated configurations. I've identified `CONFIG_NETFS_SUPPORT`, `CONFIG_MEM_ALLOC_PROFILING`, `CONFIG_9P_FS`, and `CONFIG_NET_9P`. Right, the instructions say to strip the "CONFIG_" prefix, so that becomes "NETFS_SUPPORT", "MEM_ALLOC_PROFILING", "9P_FS", and "NET_9P". Got it.

Okay, let's determine if this is WorthFuzzing. The answer is a resounding yes. This patch is modifying memory allocation in the `netfs` subsystem, and specifically it's wrapping mempool allocator calls with `alloc_hooks(...)` to register allocation tags with the kernel memory allocation profiling infrastructure. The risk is high. Netfs is a network filesystem component which can be accessed through network filesystem implementations like 9p, Ceph, AFS, and CIFS, particularly in virtualized environments. Fuzzing is relevant here to verify memory accounting and debug any assertions (especially in `alloc_tag_restore` under `CONFIG_MEM_ALLOC_PROFILING_DEBUG`).

Yep, all clear. Everything is thoroughly verified and the rationale checks out. Time to call `set-results`.

46/2 2026/09/24 04:37 tool set-results
0m Args: 
{
  "EnableConfigs": [
    "NETFS_SUPPORT",
    "MEM_ALLOC_PROFILING",
    "NET_9P",
    "9P_FS"
  ],
  "FocusSymbols": [
    "netfs_alloc_request",
    "netfs_alloc_subrequest",
    "netfs_folioq_alloc"
  ],
  "Reasoning": "The patch introduces `netfs_mempool_alloc_noreserve()` wrapped with `alloc_hooks()` to ensure allocations bypassing mempool reserve pools are properly tracked by memory allocation profiling (`CONFIG_MEM_ALLOC_PROFILING`). This alters allocation handling in `netfs_alloc_request()`, `netfs_alloc_subrequest()`, and `netfs_folioq_alloc()`. The netfs subsystem is reachable in virtualized environments (e.g., via 9p mounts), making this change worth fuzzing to detect any allocation profiling invariants or tag state corruption issues.",
  "WorthFuzzing": true
}

Results: 
{
  "EnableConfigs": [
    "NETFS_SUPPORT",
    "MEM_ALLOC_PROFILING",
    "NET_9P",
    "9P_FS"
  ],
  "FocusSymbols": [
    "netfs_alloc_request",
    "netfs_alloc_subrequest",
    "netfs_folioq_alloc"
  ],
  "Reasoning": "The patch introduces `netfs_mempool_alloc_noreserve()` wrapped with `alloc_hooks()` to ensure allocations bypassing mempool reserve pools are properly tracked by memory allocation profiling (`CONFIG_MEM_ALLOC_PROFILING`). This alters allocation handling in `netfs_alloc_request()`, `netfs_alloc_subrequest()`, and `netfs_folioq_alloc()`. The netfs subsystem is reachable in virtualized environments (e.g., via 9p mounts), making this change worth fuzzing to detect any allocation profiling invariants or tag state corruption issues.",
  "WorthFuzzing": true
}
47/1 2026/09/24 04:37 action If
1m Args: 
{
  "WorthFuzzing": true
}

Results: 
null
48/2 2026/09/24 04:37 agent kmsan-evaluator
1m Model: 
core

Args: 
null

Results: 
{
  "KMSANReasoning": "The patch introduces the helper macro `netfs_mempool_alloc_noreserve(_pool, _gfp)`, which wraps direct calls to `(_pool)-\u003ealloc()` in `alloc_hooks(...)` for allocation profiling (`CONFIG_MEM_ALLOC_PROFILING`). It replaces direct invocations of `mempool-\u003ealloc(gfp, mempool-\u003epool_data)` with this macro across `fs/netfs/objects.c` and `fs/netfs/rolling_buffer.c`.\n\nThe change does not alter the allocation behavior, object size, memory layout, or initialization of the allocated structures (`netfs_io_request`, `netfs_io_subrequest`, or `folio_queue`). All allocated objects continue to be initialized as before (e.g., zeroed via `memset`). No new data is exposed to user space, nor is any control flow altered based on uninitialized memory. Therefore, no uninitialized memory risks or info-leaks are introduced, and a dedicated KMSAN session is not needed.",
  "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 b4119a72e6f6b4e41d149ceb510185bb308a8d77
Author: syz-cluster <triage@syzkaller.com>
Date:   Thu Sep 24 04:36:00 2026 +0000

    syz-cluster: applied patch under review

diff --git a/fs/netfs/internal.h b/fs/netfs/internal.h
index c79c8e69d60ca..08ba7f0ebff04 100644
--- a/fs/netfs/internal.h
+++ b/fs/netfs/internal.h
@@ -45,6 +45,9 @@ extern mempool_t netfs_request_pool;
 extern mempool_t netfs_subrequest_pool;
 extern mempool_t netfs_folioq_pool;
 
+#define netfs_mempool_alloc_noreserve(_pool, _gfp)				\
+	alloc_hooks((_pool)->alloc(_gfp, (_pool)->pool_data))
+
 #ifdef CONFIG_PROC_FS
 static inline void netfs_proc_add_rreq(struct netfs_io_request *rreq)
 {
diff --git a/fs/netfs/objects.c b/fs/netfs/objects.c
index 7f6a3e912602e..0b509c93d4afc 100644
--- a/fs/netfs/objects.c
+++ b/fs/netfs/objects.c
@@ -34,7 +34,7 @@ struct netfs_io_request *netfs_alloc_request(struct address_space *mapping,
 
 		rreq = mempool_alloc(mempool, gfp);
 	} else {
-		rreq = mempool->alloc(gfp, mempool->pool_data);
+		rreq = netfs_mempool_alloc_noreserve(mempool, gfp);
 		if (!rreq)
 			return ERR_PTR(-ENOMEM);
 	}
@@ -214,7 +214,7 @@ struct netfs_io_subrequest *netfs_alloc_subrequest(struct netfs_io_request *rreq
 	struct kmem_cache *cache = mempool->pool_data;
 
 	if (rreq->gfp == GFP_KERNEL)
-		subreq = mempool->alloc(rreq->gfp, mempool->pool_data);
+		subreq = netfs_mempool_alloc_noreserve(mempool, rreq->gfp);
 	else
 		subreq = mempool_alloc(mempool, rreq->gfp);
 	if (!subreq)
diff --git a/fs/netfs/rolling_buffer.c b/fs/netfs/rolling_buffer.c
index 424e77a9a1098..54867ceaa205f 100644
--- a/fs/netfs/rolling_buffer.c
+++ b/fs/netfs/rolling_buffer.c
@@ -29,7 +29,7 @@ struct folio_queue *netfs_folioq_alloc(unsigned int rreq_id, gfp_t gfp,
 	struct folio_queue *fq;
 
 	if (gfp == GFP_KERNEL)
-		fq = netfs_folioq_pool.alloc(gfp, netfs_folioq_pool.pool_data);
+		fq = netfs_mempool_alloc_noreserve(&netfs_folioq_pool, gfp);
 	else
 		fq = mempool_alloc(&netfs_folioq_pool, gfp);
 	if (fq) {

49/3 2026/09/24 04:37 llm kmsan-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 2715
							output: 27
							thoughts: 960

Thoughts: 
**KMSAN Fuzzing Session Justification**

Okay, so I've been asked to review this Linux kernel patch series and decide if it warrants a dedicated KMSAN fuzzing session. My first thought is to assess the risk. This looks like a patch for KMSAN/KASAN testing, so it's a benign defensive security/QA patch. The risk is pretty much zero, so that's a good starting point.

Now, let's dive into the patch diff itself. It seems we're looking at changes in `fs/netfs/internal.h` and `fs/netfs/objects.c`, and `fs/netfs/rolling_buffer.c`.  I see a new macro, `netfs_mempool_alloc_noreserve`, being introduced and used in several places where `mempool_alloc` calls were previously made directly. This macro seems to be wrapping the mempool allocation, potentially altering how memory is allocated from the pool.

The key thing is this new `netfs_mempool_alloc_noreserve` macro. This clearly needs more investigation. I need to understand what `alloc_hooks()` is doing and what the implications of using it within the mempool allocation are. It's likely that it's related to some kind of allocation hooks, and that's the area I need to understand before I sign off. A quick `grep` for `alloc_hooks` across the kernel source is in order. Let's see what comes up and what this macro is actually doing under the hood. I suspect it alters behavior in some way related to KMSAN and KASAN, which would be the reason for the change.

50/3 2026/09/24 04:37 tool grepper
0m Args: 
{
  "Expression": "alloc_hooks",
  "PathPrefix": "include/linux/"
}

Results: 
{
  "Output": "include/linux/alloc_tag.h=249=static inline bool alloc_tag_is_inaccurate(struct alloc_tag *tag) { return false; }\n--\ninclude/linux/alloc_tag.h-253-\ninclude/linux/alloc_tag.h:254:#define alloc_hooks_tag(_tag, _do_alloc)\t\t\t\t\\\ninclude/linux/alloc_tag.h-255-({\t\t\t\t\t\t\t\t\t\\\n--\ninclude/linux/alloc_tag.h-266-\ninclude/linux/alloc_tag.h:267:#define alloc_hooks(_do_alloc)\t\t\t\t\t\t\\\ninclude/linux/alloc_tag.h-268-({\t\t\t\t\t\t\t\t\t\\\ninclude/linux/alloc_tag.h-269-\tDEFINE_ALLOC_TAG(_alloc_tag);\t\t\t\t\t\\\ninclude/linux/alloc_tag.h:270:\talloc_hooks_tag(\u0026_alloc_tag, _do_alloc);\t\t\t\\\ninclude/linux/alloc_tag.h-271-})\n--\ninclude/linux/bpfptr.h=68=static inline void *kvmemdup_bpfptr_noprof(bpfptr_t src, size_t len)\n--\ninclude/linux/bpfptr.h-79-}\ninclude/linux/bpfptr.h:80:#define kvmemdup_bpfptr(...)\talloc_hooks(kvmemdup_bpfptr_noprof(__VA_ARGS__))\ninclude/linux/bpfptr.h-81-\n--\ninclude/linux/fortify-string.h=706=__FORTIFY_INLINE void *kmemdup_noprof(const void * const POS0 p, size_t size, gfp_t gfp)\n--\ninclude/linux/fortify-string.h-716-}\ninclude/linux/fortify-string.h:717:#define kmemdup(...)\talloc_hooks(kmemdup_noprof(__VA_ARGS__))\ninclude/linux/fortify-string.h-718-\n--\ninclude/linux/gfp.h=207=struct folio *__folio_alloc_noprof(gfp_t gfp, unsigned int order, int preferred_nid,\ninclude/linux/gfp.h-208-\t\tnodemask_t *nodemask);\ninclude/linux/gfp.h:209:#define __folio_alloc(...)\t\t\talloc_hooks(__folio_alloc_noprof(__VA_ARGS__))\ninclude/linux/gfp.h-210-\ninclude/linux/gfp.h=211=unsigned long alloc_pages_bulk_noprof(gfp_t gfp, int preferred_nid,\n--\ninclude/linux/gfp.h-213-\t\t\t\tstruct page **page_array);\ninclude/linux/gfp.h:214:#define __alloc_pages_bulk(...)\t\t\talloc_hooks(alloc_pages_bulk_noprof(__VA_ARGS__))\ninclude/linux/gfp.h-215-\n--\ninclude/linux/gfp.h=218=unsigned long alloc_pages_bulk_mempolicy_noprof(gfp_t gfp,\n--\ninclude/linux/gfp.h-221-#define  alloc_pages_bulk_mempolicy(...)\t\t\t\t\\\ninclude/linux/gfp.h:222:\talloc_hooks(alloc_pages_bulk_mempolicy_noprof(__VA_ARGS__))\ninclude/linux/gfp.h-223-\n--\ninclude/linux/gfp.h=229=alloc_pages_bulk_node_noprof(gfp_t gfp, int nid, unsigned long nr_pages,\n--\ninclude/linux/gfp.h-238-#define alloc_pages_bulk_node(...)\t\t\t\t\\\ninclude/linux/gfp.h:239:\talloc_hooks(alloc_pages_bulk_node_noprof(__VA_ARGS__))\ninclude/linux/gfp.h-240-\n--\ninclude/linux/gfp.h=256=struct folio *__folio_alloc_node_noprof(gfp_t gfp, unsigned int order, int nid)\n--\ninclude/linux/gfp.h-262-\ninclude/linux/gfp.h:263:#define  __folio_alloc_node(...)\t\talloc_hooks(__folio_alloc_node_noprof(__VA_ARGS__))\ninclude/linux/gfp.h-264-\n--\ninclude/linux/gfp.h=270=struct page *alloc_pages_node_noprof(int nid, gfp_t gfp_mask, unsigned int order);\ninclude/linux/gfp.h-271-\ninclude/linux/gfp.h:272:#define  alloc_pages_node(...)\t\t\talloc_hooks(alloc_pages_node_noprof(__VA_ARGS__))\ninclude/linux/gfp.h-273-\n--\ninclude/linux/gfp.h=295=static inline struct folio *vma_alloc_folio_noprof(gfp_t gfp, int order,\n--\ninclude/linux/gfp.h-301-\ninclude/linux/gfp.h:302:#define alloc_pages(...)\t\t\talloc_hooks(alloc_pages_noprof(__VA_ARGS__))\ninclude/linux/gfp.h:303:#define folio_alloc(...)\t\t\talloc_hooks(folio_alloc_noprof(__VA_ARGS__))\ninclude/linux/gfp.h:304:#define folio_alloc_mpol(...)\t\t\talloc_hooks(folio_alloc_mpol_noprof(__VA_ARGS__))\ninclude/linux/gfp.h:305:#define vma_alloc_folio(...)\t\t\talloc_hooks(vma_alloc_folio_noprof(__VA_ARGS__))\ninclude/linux/gfp.h-306-\n--\ninclude/linux/gfp.h=309=static inline struct page *alloc_page_vma_noprof(gfp_t gfp,\n--\ninclude/linux/gfp.h-315-}\ninclude/linux/gfp.h:316:#define alloc_page_vma(...)\t\t\talloc_hooks(alloc_page_vma_noprof(__VA_ARGS__))\ninclude/linux/gfp.h-317-\ninclude/linux/gfp.h=318=struct page *alloc_pages_nolock_noprof(gfp_t gfp_flags, int nid, unsigned int order);\ninclude/linux/gfp.h:319:#define alloc_pages_nolock(...)\t\t\talloc_hooks(alloc_pages_nolock_noprof(__VA_ARGS__))\ninclude/linux/gfp.h-320-\ninclude/linux/gfp.h=321=extern unsigned long get_free_pages_noprof(gfp_t gfp_mask, unsigned int order);\ninclude/linux/gfp.h:322:#define __get_free_pages(...)\t\t\talloc_hooks(get_free_pages_noprof(__VA_ARGS__))\ninclude/linux/gfp.h-323-\ninclude/linux/gfp.h=324=extern unsigned long get_zeroed_page_noprof(gfp_t gfp_mask);\ninclude/linux/gfp.h:325:#define get_zeroed_page(...)\t\t\talloc_hooks(get_zeroed_page_noprof(__VA_ARGS__))\ninclude/linux/gfp.h-326-\ninclude/linux/gfp.h=327=void *alloc_pages_exact_noprof(size_t size, gfp_t gfp_mask) __alloc_size(1);\ninclude/linux/gfp.h:328:#define alloc_pages_exact(...)\t\t\talloc_hooks(alloc_pages_exact_noprof(__VA_ARGS__))\ninclude/linux/gfp.h-329-\n--\ninclude/linux/gfp.h=332=__meminit void *alloc_pages_exact_nid_noprof(int nid, size_t size, gfp_t gfp_mask) __alloc_size(2);\ninclude/linux/gfp.h-333-#define alloc_pages_exact_nid(...)\t\t\t\t\t\\\ninclude/linux/gfp.h:334:\talloc_hooks(alloc_pages_exact_nid_noprof(__VA_ARGS__))\ninclude/linux/gfp.h-335-\n--\ninclude/linux/gfp.h=395=int alloc_contig_frozen_range_noprof(unsigned long start, unsigned long end,\n--\ninclude/linux/gfp.h-397-#define alloc_contig_frozen_range(...)\t\\\ninclude/linux/gfp.h:398:\talloc_hooks(alloc_contig_frozen_range_noprof(__VA_ARGS__))\ninclude/linux/gfp.h-399-\ninclude/linux/gfp.h=400=int alloc_contig_range_noprof(unsigned long start, unsigned long end,\n--\ninclude/linux/gfp.h-402-#define alloc_contig_range(...)\t\\\ninclude/linux/gfp.h:403:\talloc_hooks(alloc_contig_range_noprof(__VA_ARGS__))\ninclude/linux/gfp.h-404-\ninclude/linux/gfp.h=405=struct page *alloc_contig_frozen_pages_noprof(unsigned long nr_pages,\n--\ninclude/linux/gfp.h-407-#define alloc_contig_frozen_pages(...) \\\ninclude/linux/gfp.h:408:\talloc_hooks(alloc_contig_frozen_pages_noprof(__VA_ARGS__))\ninclude/linux/gfp.h-409-\ninclude/linux/gfp.h=410=struct page *alloc_contig_pages_noprof(unsigned long nr_pages, gfp_t gfp_mask,\n--\ninclude/linux/gfp.h-412-#define alloc_contig_pages(...)\t\\\ninclude/linux/gfp.h:413:\talloc_hooks(alloc_contig_pages_noprof(__VA_ARGS__))\ninclude/linux/gfp.h-414-\n--\ninclude/linux/mempool.h=44=int mempool_init_noprof(struct mempool *pool, int min_nr,\n--\ninclude/linux/mempool.h-47-#define mempool_init(...)\t\t\t\t\t\t\\\ninclude/linux/mempool.h:48:\talloc_hooks(mempool_init_noprof(__VA_ARGS__))\ninclude/linux/mempool.h-49-\n--\ninclude/linux/mempool.h=52=struct mempool *mempool_create_node_noprof(int min_nr,\n--\ninclude/linux/mempool.h-55-#define mempool_create_node(...)\t\t\t\t\t\\\ninclude/linux/mempool.h:56:\talloc_hooks(mempool_create_node_noprof(__VA_ARGS__))\ninclude/linux/mempool.h-57-\n--\ninclude/linux/mempool.h=65=void *mempool_alloc_noprof(struct mempool *pool, gfp_t gfp_mask) __malloc;\ninclude/linux/mempool.h-66-#define mempool_alloc(...)\t\t\t\t\t\t\\\ninclude/linux/mempool.h:67:\talloc_hooks(mempool_alloc_noprof(__VA_ARGS__))\ninclude/linux/mempool.h-68-int mempool_alloc_bulk_noprof(struct mempool *pool, void **elem,\n--\ninclude/linux/mempool.h-70-#define mempool_alloc_bulk(...)\t\t\t\t\t\t\\\ninclude/linux/mempool.h:71:\talloc_hooks(mempool_alloc_bulk_noprof(__VA_ARGS__))\ninclude/linux/mempool.h-72-\n--\ninclude/linux/mm.h=3792=static inline struct ptdesc *pagetable_alloc_noprof(gfp_t gfp, unsigned int order)\n--\ninclude/linux/mm.h-3797-}\ninclude/linux/mm.h:3798:#define pagetable_alloc(...)\talloc_hooks(pagetable_alloc_noprof(__VA_ARGS__))\ninclude/linux/mm.h-3799-\n--\ninclude/linux/mm_types.h=1591=static inline int mm_alloc_cid_noprof(struct mm_struct *mm, struct task_struct *p)\n--\ninclude/linux/mm_types.h-1598-}\ninclude/linux/mm_types.h:1599:# define mm_alloc_cid(...)\talloc_hooks(mm_alloc_cid_noprof(__VA_ARGS__))\ninclude/linux/mm_types.h-1600-\n--\ninclude/linux/mm_types.h=1630=static inline int mm_alloc_sched_noprof(struct mm_struct *mm)\n--\ninclude/linux/mm_types.h-1641-\ninclude/linux/mm_types.h:1642:#define mm_alloc_sched(...)\talloc_hooks(mm_alloc_sched_noprof(__VA_ARGS__))\ninclude/linux/mm_types.h-1643-\n--\ninclude/linux/pagemap.h=655=static inline struct folio *filemap_alloc_folio_noprof(gfp_t gfp, unsigned int order,\n--\ninclude/linux/pagemap.h-662-#define filemap_alloc_folio(...)\t\t\t\t\\\ninclude/linux/pagemap.h:663:\talloc_hooks(filemap_alloc_folio_noprof(__VA_ARGS__))\ninclude/linux/pagemap.h-664-\n--\ninclude/linux/percpu.h=137=extern void __percpu *pcpu_alloc_noprof(size_t size, size_t align, bool reserved,\n--\ninclude/linux/percpu.h-140-#define __alloc_percpu_gfp(_size, _align, _gfp)\t\t\t\t\\\ninclude/linux/percpu.h:141:\talloc_hooks(pcpu_alloc_noprof(_size, _align, false, _gfp))\ninclude/linux/percpu.h-142-#define __alloc_percpu(_size, _align)\t\t\t\t\t\\\ninclude/linux/percpu.h:143:\talloc_hooks(pcpu_alloc_noprof(_size, _align, false, GFP_KERNEL))\ninclude/linux/percpu.h-144-#define __alloc_reserved_percpu(_size, _align)\t\t\t\t\\\ninclude/linux/percpu.h:145:\talloc_hooks(pcpu_alloc_noprof(_size, _align, true, GFP_KERNEL))\ninclude/linux/percpu.h-146-\n--\ninclude/linux/ptr_ring.h=519=static inline int ptr_ring_init_noprof(struct ptr_ring *r, int size, gfp_t gfp)\n--\ninclude/linux/ptr_ring.h-531-}\ninclude/linux/ptr_ring.h:532:#define ptr_ring_init(...)\talloc_hooks(ptr_ring_init_noprof(__VA_ARGS__))\ninclude/linux/ptr_ring.h-533-\n--\ninclude/linux/ptr_ring.h=619=static inline int ptr_ring_resize_noprof(struct ptr_ring *r, int size, gfp_t gfp,\n--\ninclude/linux/ptr_ring.h-640-}\ninclude/linux/ptr_ring.h:641:#define ptr_ring_resize(...)\talloc_hooks(ptr_ring_resize_noprof(__VA_ARGS__))\ninclude/linux/ptr_ring.h-642-\n--\ninclude/linux/ptr_ring.h=649=static inline int ptr_ring_resize_multiple_bh_noprof(struct ptr_ring **rings,\n--\ninclude/linux/ptr_ring.h-692-#define ptr_ring_resize_multiple_bh(...) \\\ninclude/linux/ptr_ring.h:693:\t\talloc_hooks(ptr_ring_resize_multiple_bh_noprof(__VA_ARGS__))\ninclude/linux/ptr_ring.h-694-\n--\ninclude/linux/rhashtable-types.h=139=int __rhashtable_init_noprof(struct rhashtable *ht,\n--\ninclude/linux/rhashtable-types.h-147-})\ninclude/linux/rhashtable-types.h:148:#define rhashtable_init(...)\talloc_hooks(rhashtable_init_noprof(__VA_ARGS__))\ninclude/linux/rhashtable-types.h-149-\ninclude/linux/rhashtable-types.h=150=int __rhltable_init_noprof(struct rhltable *hlt,\n--\ninclude/linux/rhashtable-types.h-158-})\ninclude/linux/rhashtable-types.h:159:#define rhltable_init(...)\talloc_hooks(rhltable_init_noprof(__VA_ARGS__))\ninclude/linux/rhashtable-types.h-160-\n--\ninclude/linux/skb_array.h=180=static inline int skb_array_init_noprof(struct skb_array *a, int size, gfp_t gfp)\n--\ninclude/linux/skb_array.h-183-}\ninclude/linux/skb_array.h:184:#define skb_array_init(...)\talloc_hooks(skb_array_init_noprof(__VA_ARGS__))\ninclude/linux/skb_array.h-185-\n--\ninclude/linux/skb_array.h=202=static inline int skb_array_resize_multiple_bh_noprof(struct skb_array **rings,\n--\ninclude/linux/skb_array.h-212-#define skb_array_resize_multiple_bh(...)\t\\\ninclude/linux/skb_array.h:213:\t\talloc_hooks(skb_array_resize_multiple_bh_noprof(__VA_ARGS__))\ninclude/linux/skb_array.h-214-\n--\ninclude/linux/skbuff.h=3596=static inline struct page *__dev_alloc_pages_noprof(gfp_t gfp_mask,\n--\ninclude/linux/skbuff.h-3610-}\ninclude/linux/skbuff.h:3611:#define __dev_alloc_pages(...)\talloc_hooks(__dev_alloc_pages_noprof(__VA_ARGS__))\ninclude/linux/skbuff.h-3612-\n--\ninclude/linux/skbuff.h=3627=static inline struct page *__dev_alloc_page_noprof(gfp_t gfp_mask)\n--\ninclude/linux/skbuff.h-3630-}\ninclude/linux/skbuff.h:3631:#define __dev_alloc_page(...)\talloc_hooks(__dev_alloc_page_noprof(__VA_ARGS__))\ninclude/linux/skbuff.h-3632-\n--\ninclude/linux/slab.h=588=void *krealloc_node_align(const void *p, size_t new_size, unsigned long align, gfp_t flags, int nid);\n--\ninclude/linux/slab.h-590-#define krealloc_node_align(p, new_size, align, flags, nid) \\\ninclude/linux/slab.h:591:\talloc_hooks(krealloc_node_align_noprof(p, PASS_TOKEN_PARAMS(new_size, __kmalloc_token(new_size)), align, flags, nid))\ninclude/linux/slab.h-592-#define krealloc_node(_o, _s, _f, _n)\tkrealloc_node_align(_o, _s, 1, _f, _n)\n--\ninclude/linux/slab.h=854=void *kmem_cache_alloc_noprof(struct kmem_cache *cachep,\ninclude/linux/slab.h-855-\t\t\t      gfp_t flags) __assume_slab_alignment __malloc;\ninclude/linux/slab.h:856:#define kmem_cache_alloc(...)\t\t\talloc_hooks(kmem_cache_alloc_noprof(__VA_ARGS__))\ninclude/linux/slab.h-857-\ninclude/linux/slab.h=858=void *kmem_cache_alloc_lru_noprof(struct kmem_cache *s, struct list_lru *lru,\ninclude/linux/slab.h-859-\t\t\t    gfp_t gfpflags) __assume_slab_alignment __malloc;\ninclude/linux/slab.h:860:#define kmem_cache_alloc_lru(...)\talloc_hooks(kmem_cache_alloc_lru_noprof(__VA_ARGS__))\ninclude/linux/slab.h-861-\n--\ninclude/linux/slab.h=906=bool kmem_cache_alloc_bulk_noprof(struct kmem_cache *s, gfp_t flags,\n--\ninclude/linux/slab.h-908-#define kmem_cache_alloc_bulk(...) \\\ninclude/linux/slab.h:909:\talloc_hooks(kmem_cache_alloc_bulk_noprof(__VA_ARGS__))\ninclude/linux/slab.h-910-\n--\ninclude/linux/slab.h=916=void *kmem_cache_alloc_node_noprof(struct kmem_cache *s, gfp_t flags,\ninclude/linux/slab.h-917-\t\t\t\t   int node) __assume_slab_alignment __malloc;\ninclude/linux/slab.h:918:#define kmem_cache_alloc_node(...)\talloc_hooks(kmem_cache_alloc_node_noprof(__VA_ARGS__))\ninclude/linux/slab.h-919-\n--\ninclude/linux/slab.h=929=void *kmem_cache_alloc_from_sheaf_noprof(struct kmem_cache *cachep, gfp_t gfp,\n--\ninclude/linux/slab.h-931-#define kmem_cache_alloc_from_sheaf(...)\t\\\ninclude/linux/slab.h:932:\t\t\talloc_hooks(kmem_cache_alloc_from_sheaf_noprof(__VA_ARGS__))\ninclude/linux/slab.h-933-\n--\ninclude/linux/slab.h=1054=void *kmalloc(size_t size, gfp_t flags);\ninclude/linux/slab.h-1055-#endif\ninclude/linux/slab.h:1056:#define kmalloc(size, flags)\t\t\talloc_hooks(kmalloc_noprof(size, flags))\ninclude/linux/slab.h-1057-\n--\ninclude/linux/slab.h=1073=void *kmalloc_nolock(size_t size, gfp_t gfp_flags, int node);\ninclude/linux/slab.h-1074-#endif\ninclude/linux/slab.h:1075:#define kmalloc_nolock(size, gfp_flags, node)\talloc_hooks(kmalloc_nolock_noprof(size, gfp_flags, node))\ninclude/linux/slab.h-1076-\n--\ninclude/linux/slab.h-1178-#define kmem_buckets_alloc(_b, _size, _flags)\t\\\ninclude/linux/slab.h:1179:\talloc_hooks(__kmalloc_node_noprof(PASS_KMALLOC_PARAMS(_size, _b, __kmalloc_token(_size)), _flags, NUMA_NO_NODE))\ninclude/linux/slab.h-1180-\ninclude/linux/slab.h-1181-#define kmem_buckets_alloc_node_track_caller(_b, _size, _flags, _node)\t\\\ninclude/linux/slab.h:1182:\talloc_hooks(__kmalloc_node_track_caller_noprof(PASS_KMALLOC_PARAMS(_size, _b, __kmalloc_token(_size)), _flags, _node, _RET_IP_))\ninclude/linux/slab.h-1183-\n--\ninclude/linux/slab.h=1187=static __always_inline __alloc_size(1) void *_kmalloc_node_noprof(size_t size, gfp_t flags, int node, kmalloc_token_t token)\n--\ninclude/linux/slab.h-1202-#define kmalloc_node_noprof(...)\t\t_kmalloc_node_noprof(__VA_ARGS__, __kmalloc_token(__VA_ARGS__))\ninclude/linux/slab.h:1203:#define kmalloc_node(...)\t\t\talloc_hooks(kmalloc_node_noprof(__VA_ARGS__))\ninclude/linux/slab.h-1204-\n--\ninclude/linux/slab.h=1221=void *kmalloc_array(size_t n, size_t size, gfp_t flags);\ninclude/linux/slab.h-1222-#endif\ninclude/linux/slab.h:1223:#define kmalloc_array(n, size, flags)\t\talloc_hooks(kmalloc_array_noprof(n, size, flags))\ninclude/linux/slab.h-1224-\n--\ninclude/linux/slab.h=1256=void *krealloc_array(void *p, size_t new_n, size_t new_size, gfp_t flags);\ninclude/linux/slab.h-1257-#endif\ninclude/linux/slab.h:1258:#define krealloc_array(p, new_n, new_size, flags) alloc_hooks(krealloc_array_noprof(p, new_n, new_size, flags))\ninclude/linux/slab.h-1259-\n--\ninclude/linux/slab.h=1268=void *__kmalloc_node_track_caller_noprof(DECL_KMALLOC_PARAMS(size, b, token), gfp_t flags, int node,\n--\ninclude/linux/slab.h-1272-#define kmalloc_node_track_caller(...)\t\t\\\ninclude/linux/slab.h:1273:\talloc_hooks(kmalloc_node_track_caller_noprof(__VA_ARGS__, _RET_IP_))\ninclude/linux/slab.h-1274-\n--\ninclude/linux/slab.h=1288=static inline __alloc_size(1, 2) void *_kmalloc_array_node_noprof(size_t n, size_t size, gfp_t flags,\n--\ninclude/linux/slab.h-1299-#define kmalloc_array_node_noprof(...)\t\t_kmalloc_array_node_noprof(__VA_ARGS__, __kmalloc_token(__VA_ARGS__))\ninclude/linux/slab.h:1300:#define kmalloc_array_node(...)\t\t\talloc_hooks(kmalloc_array_node_noprof(__VA_ARGS__))\ninclude/linux/slab.h-1301-\n--\ninclude/linux/slab.h=1321=void *kzalloc(size_t size, gfp_t flags);\ninclude/linux/slab.h-1322-#endif\ninclude/linux/slab.h:1323:#define kzalloc(size, flags)\t\t\talloc_hooks(kzalloc_noprof(size, flags))\ninclude/linux/slab.h-1324-#define kzalloc_node(_size, _flags, _node)\tkmalloc_node(_size, (_flags)|__GFP_ZERO, _node)\n--\ninclude/linux/slab.h=1326=void *__kvmalloc_node_noprof(DECL_KMALLOC_PARAMS(size, b, token), unsigned long align,\n--\ninclude/linux/slab.h-1330-#define kvmalloc_node_align(...)\t\t\\\ninclude/linux/slab.h:1331:\talloc_hooks(kvmalloc_node_align_noprof(__VA_ARGS__))\ninclude/linux/slab.h-1332-#if 0 /* kernel-doc */\n--\ninclude/linux/slab.h=1352=void *kvmalloc_node(size_t size, gfp_t flags, int node);\n--\ninclude/linux/slab.h-1363-#define kmem_buckets_valloc(_b, _size, _flags)\t\\\ninclude/linux/slab.h:1364:\talloc_hooks(__kvmalloc_node_noprof(PASS_KMALLOC_PARAMS(_size, _b, __kmalloc_token(_size)), 1, _flags, NUMA_NO_NODE))\ninclude/linux/slab.h-1365-\n--\ninclude/linux/slab.h=1367=_kvmalloc_array_node_noprof(size_t n, size_t size, gfp_t flags, int node, kmalloc_token_t token)\n--\ninclude/linux/slab.h-1380-\ninclude/linux/slab.h:1381:#define kvmalloc_array(...)\t\t\talloc_hooks(kvmalloc_array_noprof(__VA_ARGS__))\ninclude/linux/slab.h:1382:#define kvcalloc_node(...)\t\t\talloc_hooks(kvcalloc_node_noprof(__VA_ARGS__))\ninclude/linux/slab.h:1383:#define kvcalloc(...)\t\t\t\talloc_hooks(kvcalloc_noprof(__VA_ARGS__))\ninclude/linux/slab.h-1384-\n--\ninclude/linux/slab.h=1415=void *kvrealloc_node_align(const void *p, size_t size, unsigned long align, gfp_t flags, int nid);\n--\ninclude/linux/slab.h-1417-#define kvrealloc_node_align(p, size, align, flags, nid)\t\\\ninclude/linux/slab.h:1418:\talloc_hooks(kvrealloc_node_align_noprof(p, PASS_TOKEN_PARAMS(size, __kmalloc_token(size)), align, flags, nid))\ninclude/linux/slab.h-1419-#define kvrealloc_node(_p, _s, _f, _n)\t\tkvrealloc_node_align(_p, _s, 1, _f, _n)\n--\ninclude/linux/sockptr.h=120=static inline void *memdup_sockptr_noprof(sockptr_t src, size_t len)\n--\ninclude/linux/sockptr.h-131-}\ninclude/linux/sockptr.h:132:#define memdup_sockptr(...)\talloc_hooks(memdup_sockptr_noprof(__VA_ARGS__))\ninclude/linux/sockptr.h-133-\ninclude/linux/sockptr.h=134=static inline void *memdup_sockptr_nul_noprof(sockptr_t src, size_t len)\n--\ninclude/linux/sockptr.h-146-}\ninclude/linux/sockptr.h:147:#define memdup_sockptr_nul(...)\talloc_hooks(memdup_sockptr_nul_noprof(__VA_ARGS__))\ninclude/linux/sockptr.h-148-\n--\ninclude/linux/string.h=301=extern void *kmemdup_noprof(const void *src, size_t len, gfp_t gfp) __realloc_size(2);\ninclude/linux/string.h:302:#define kmemdup(...)\talloc_hooks(kmemdup_noprof(__VA_ARGS__))\ninclude/linux/string.h-303-\n--\ninclude/linux/vmalloc.h=150=extern void *vmalloc_noprof(unsigned long size) __alloc_size(1);\ninclude/linux/vmalloc.h:151:#define vmalloc(...)\t\talloc_hooks(vmalloc_noprof(__VA_ARGS__))\ninclude/linux/vmalloc.h-152-\ninclude/linux/vmalloc.h=153=extern void *vzalloc_noprof(unsigned long size) __alloc_size(1);\ninclude/linux/vmalloc.h:154:#define vzalloc(...)\t\talloc_hooks(vzalloc_noprof(__VA_ARGS__))\ninclude/linux/vmalloc.h-155-\ninclude/linux/vmalloc.h=156=extern void *vmalloc_user_noprof(unsigned long size) __alloc_size(1);\ninclude/linux/vmalloc.h:157:#define vmalloc_user(...)\talloc_hooks(vmalloc_user_noprof(__VA_ARGS__))\ninclude/linux/vmalloc.h-158-\ninclude/linux/vmalloc.h=159=extern void *vmalloc_node_noprof(unsigned long size, int node) __alloc_size(1);\ninclude/linux/vmalloc.h:160:#define vmalloc_node(...)\talloc_hooks(vmalloc_node_noprof(__VA_ARGS__))\ninclude/linux/vmalloc.h-161-\ninclude/linux/vmalloc.h=162=extern void *vzalloc_node_noprof(unsigned long size, int node) __alloc_size(1);\ninclude/linux/vmalloc.h:163:#define vzalloc_node(...)\talloc_hooks(vzalloc_node_noprof(__VA_ARGS__))\ninclude/linux/vmalloc.h-164-\ninclude/linux/vmalloc.h=165=extern void *vmalloc_32_noprof(unsigned long size) __alloc_size(1);\ninclude/linux/vmalloc.h:166:#define vmalloc_32(...)\t\talloc_hooks(vmalloc_32_noprof(__VA_ARGS__))\ninclude/linux/vmalloc.h-167-\ninclude/linux/vmalloc.h=168=extern void *vmalloc_32_user_noprof(unsigned long size) __alloc_size(1);\ninclude/linux/vmalloc.h:169:#define vmalloc_32_user(...)\talloc_hooks(vmalloc_32_user_noprof(__VA_ARGS__))\ninclude/linux/vmalloc.h-170-\ninclude/linux/vmalloc.h=171=extern void *__vmalloc_noprof(unsigned long size, gfp_t gfp_mask) __alloc_size(1);\ninclude/linux/vmalloc.h:172:#define __vmalloc(...)\t\talloc_hooks(__vmalloc_noprof(__VA_ARGS__))\ninclude/linux/vmalloc.h-173-\ninclude/linux/vmalloc.h=174=extern void *__vmalloc_node_range_noprof(unsigned long size, unsigned long align,\n--\ninclude/linux/vmalloc.h-177-\t\t\tconst void *caller) __alloc_size(1);\ninclude/linux/vmalloc.h:178:#define __vmalloc_node_range(...)\talloc_hooks(__vmalloc_node_range_noprof(__VA_ARGS__))\ninclude/linux/vmalloc.h-179-\ninclude/linux/vmalloc.h=180=void *__vmalloc_node_noprof(unsigned long size, unsigned long align, gfp_t gfp_mask,\ninclude/linux/vmalloc.h-181-\t\tint node, const void *caller) __alloc_size(1);\ninclude/linux/vmalloc.h:182:#define __vmalloc_node(...)\talloc_hooks(__vmalloc_node_noprof(__VA_ARGS__))\ninclude/linux/vmalloc.h-183-\ninclude/linux/vmalloc.h=184=void *vmalloc_huge_node_noprof(unsigned long size, gfp_t gfp_mask, int node) __alloc_size(1);\ninclude/linux/vmalloc.h:185:#define vmalloc_huge_node(...)\talloc_hooks(vmalloc_huge_node_noprof(__VA_ARGS__))\ninclude/linux/vmalloc.h-186-\n--\ninclude/linux/vmalloc.h=192=extern void *__vmalloc_array_noprof(size_t n, size_t size, gfp_t flags) __alloc_size(1, 2);\ninclude/linux/vmalloc.h:193:#define __vmalloc_array(...)\talloc_hooks(__vmalloc_array_noprof(__VA_ARGS__))\ninclude/linux/vmalloc.h-194-\ninclude/linux/vmalloc.h=195=extern void *vmalloc_array_noprof(size_t n, size_t size) __alloc_size(1, 2);\ninclude/linux/vmalloc.h:196:#define vmalloc_array(...)\talloc_hooks(vmalloc_array_noprof(__VA_ARGS__))\ninclude/linux/vmalloc.h-197-\ninclude/linux/vmalloc.h=198=extern void *__vcalloc_noprof(size_t n, size_t size, gfp_t flags) __alloc_size(1, 2);\ninclude/linux/vmalloc.h:199:#define __vcalloc(...)\t\talloc_hooks(__vcalloc_noprof(__VA_ARGS__))\ninclude/linux/vmalloc.h-200-\ninclude/linux/vmalloc.h=201=extern void *vcalloc_noprof(size_t n, size_t size) __alloc_size(1, 2);\ninclude/linux/vmalloc.h:202:#define vcalloc(...)\t\talloc_hooks(vcalloc_noprof(__VA_ARGS__))\ninclude/linux/vmalloc.h-203-\ninclude/linux/vmalloc.h=204=void *__must_check vrealloc_node_align_noprof(const void *p, size_t size,\n--\ninclude/linux/vmalloc.h-209-\tvrealloc_node_align_noprof(_p, _s, 1, _f, NUMA_NO_NODE)\ninclude/linux/vmalloc.h:210:#define vrealloc_node_align(...)\t\talloc_hooks(vrealloc_node_align_noprof(__VA_ARGS__))\ninclude/linux/vmalloc.h:211:#define vrealloc_node(...)\t\t\talloc_hooks(vrealloc_node_noprof(__VA_ARGS__))\ninclude/linux/vmalloc.h:212:#define vrealloc(...)\t\t\t\talloc_hooks(vrealloc_noprof(__VA_ARGS__))\ninclude/linux/vmalloc.h-213-\n--\ninclude/linux/workqueue.h=518=alloc_workqueue_noprof(const char *fmt, unsigned int flags, int max_active, ...);\ninclude/linux/workqueue.h:519:#define alloc_workqueue(...)\talloc_hooks(alloc_workqueue_noprof(__VA_ARGS__))\ninclude/linux/workqueue.h-520-\n--\ninclude/linux/workqueue.h=538=devm_alloc_workqueue_noprof(struct device *dev, const char *fmt,\n--\ninclude/linux/workqueue.h-540-#define devm_alloc_workqueue(...)\t\\\ninclude/linux/workqueue.h:541:\talloc_hooks(devm_alloc_workqueue_noprof(__VA_ARGS__))\ninclude/linux/workqueue.h-542-\n--\ninclude/linux/workqueue.h=560=alloc_workqueue_lockdep_map(const char *fmt, unsigned int flags, int max_active,\n--\ninclude/linux/workqueue.h-579-#define alloc_ordered_workqueue_lockdep_map(fmt, flags, lockdep_map, args...)\t\\\ninclude/linux/workqueue.h:580:\talloc_hooks(alloc_workqueue_lockdep_map(fmt, WQ_UNBOUND | __WQ_ORDERED | (flags),\\\ninclude/linux/workqueue.h-581-\t\t\t\t\t\t1, lockdep_map, ##args))\n--\ninclude/linux/workqueue.h=615=struct workqueue_attrs *alloc_workqueue_attrs_noprof(void);\ninclude/linux/workqueue.h:616:#define alloc_workqueue_attrs(...)\talloc_hooks(alloc_workqueue_attrs_noprof(__VA_ARGS__))\ninclude/linux/workqueue.h-617-\n"
}
51/3 2026/09/24 04:37 llm kmsan-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 14104
							output: 35
							thoughts: 357

Thoughts: 
**Analyzing Memory Allocation Profiling in NetFS**

Okay, so I'm looking at how memory allocation profiling works, specifically with `alloc_hooks` which is enabled by `CONFIG_MEM_ALLOC_PROFILING`. The macro definition itself is interesting:

```c
#define alloc_hooks(_do_alloc) \
({ \
	DEFINE_ALLOC_TAG(_alloc_tag); \
	alloc_hooks_tag(&_alloc_tag, _do_alloc); \
})
```

It seems to be setting up an allocation tag and then calling `alloc_hooks_tag` with it. Now, where things get interesting is how `mempool_alloc` is defined:

```c
#define mempool_alloc(...) alloc_hooks(mempool_alloc_noprof(__VA_ARGS__))
```

This is the key. `mempool_alloc` is designed to trigger the profiling hooks by wrapping the actual allocation function, `mempool_alloc_noprof`, with `alloc_hooks`. So, the allocation tag gets assigned and tracked for profiling purposes. However, the code notes that in three specific places within `fs/netfs`, they were *bypassing* this mechanism. They were calling `mempool->alloc(gfp, mempool->pool_data)` directly, likely to avoid any reservation behavior when using flags like `GFP_KERNEL`. This is a clear problem! We're losing crucial profiling information.

The solution? The developer has created a new macro:

```c
#define netfs_mempool_alloc_noreserve(_pool, _gfp)				\
	alloc_hooks((_pool)->alloc(_gfp, (_pool)->pool_data))
```

This is brilliant. It re-introduces the profiling hooks, even when the `mempool->alloc` function is called directly to bypass the reserve. We're now wrapping the direct call with `alloc_hooks` to ensure the allocation is tracked.

The code now replaces the direct allocation call:

`rreq = mempool->alloc(gfp, mempool->pool_data);`

with:

`rreq = netfs_mempool_alloc_noreserve(mempool, gfp);`

Excellent. It seems prudent to take a look at the surrounding code to understand the context and why this change was needed. I'm going to look at `fs/netfs/objects.c` and `fs/netfs/rolling_buffer.c` around those specific lines to gain a deeper understanding of the situation.

52/3 2026/09/24 04:38 tool read-file
0m Args: 
{
  "File": "fs/netfs/objects.c",
  "FirstLine": 20,
  "LineCount": 45
}

Results: 
{
  "Contents": "  20:\t\t\t\t\t\t     enum netfs_io_origin origin)\n  21:\t{\n  22:\t\tstatic atomic_t debug_ids;\n  23:\t\tstruct inode *inode = file ? file_inode(file) : mapping-\u003ehost;\n  24:\t\tstruct netfs_inode *ctx = netfs_inode(inode);\n  25:\t\tstruct netfs_io_request *rreq;\n  26:\t\tmempool_t *mempool = ctx-\u003eops-\u003erequest_pool ?: \u0026netfs_request_pool;\n  27:\t\tstruct kmem_cache *cache = mempool-\u003epool_data;\n  28:\t\tgfp_t gfp = GFP_KERNEL;\n  29:\t\tint ret;\n  30:\t\n  31:\t\t/* Writeback is part of memory reclaim and must not fail due to ENOMEM. */\n  32:\t\tif (origin == NETFS_WRITEBACK || origin == NETFS_WRITEBACK_SINGLE) {\n  33:\t\t\tgfp = GFP_NOFS; /* Allows use of mempools. */\n  34:\t\n  35:\t\t\trreq = mempool_alloc(mempool, gfp);\n  36:\t\t} else {\n  37:\t\t\trreq = netfs_mempool_alloc_noreserve(mempool, gfp);\n  38:\t\t\tif (!rreq)\n  39:\t\t\t\treturn ERR_PTR(-ENOMEM);\n  40:\t\t}\n  41:\t\n  42:\t\tmemset(rreq, 0, kmem_cache_size(cache));\n  43:\t\tINIT_WORK(\u0026rreq-\u003ecleanup_work, netfs_free_request);\n  44:\t\trreq-\u003egfp\t\t= gfp;\n  45:\t\trreq-\u003estart\t\t= start;\n  46:\t\trreq-\u003ecollected_to\t= start;\n  47:\t\trreq-\u003ecleaned_to\t= start;\n  48:\t\trreq-\u003elen\t\t= len;\n  49:\t\trreq-\u003eprogress_at\t= 0;\n  50:\t\trreq-\u003eorigin\t\t= origin;\n  51:\t\trreq-\u003enetfs_ops\t\t= ctx-\u003eops;\n  52:\t\trreq-\u003emapping\t\t= mapping;\n  53:\t\trreq-\u003einode\t\t= inode;\n  54:\t\trreq-\u003ei_size\t\t= i_size_read(inode);\n  55:\t\trreq-\u003edebug_id\t\t= atomic_inc_return(\u0026debug_ids);\n  56:\t\trreq-\u003ewsize\t\t= INT_MAX;\n  57:\t\trreq-\u003eio_streams[0].sreq_max_len = ULONG_MAX;\n  58:\t\trreq-\u003eio_streams[0].sreq_max_segs = 0;\n  59:\t\tspin_lock_init(\u0026rreq-\u003elock);\n  60:\t\tinit_waitqueue_head(\u0026rreq-\u003ewaitq);\n  61:\t\trefcount_set(\u0026rreq-\u003eref, 2);\n  62:\t\n  63:\t\tfor (int s = 0; s \u003c NR_IO_STREAMS; s++) {\n  64:\t\t\tstruct netfs_io_stream *stream = \u0026rreq-\u003eio_streams[s];\n"
}
53/3 2026/09/24 04:38 llm kmsan-evaluator
1m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 15860
							output: 36
							thoughts: 55

Thoughts: 
Here's my analysis of the provided code snippet:

**Initialization and Allocation in `netfs` Subrequests**

Alright, let's zero in on this memory allocation within the `netfs` context. Specifically, I'm looking at line 42: `memset(rreq, 0, kmem_cache_size(cache));`. This is the critical line. It's clearly intended to initialize the entire `rreq` object, which represents the allocated request, with zeros.  The size used for the `memset` is determined by `kmem_cache_size(cache)`. This immediately tells me that the object pool management is likely based on `kmem_cache`, and the `rreq` object is being zeroed after allocation from that cache. The implication here is a clean state on allocation to avoid lingering data or garbage values. Given the potential for sensitive information to be involved in a network file system, zeroing the memory is a very prudent security measure and a good coding practice.  It also implies that the fields within `rreq` are not guaranteed to have default values after allocation.
I'll head to `netfs_alloc_subrequest` to see how the allocation of the `rreq` object is handled.

54/3 2026/09/24 04:39 tool read-file
0m Args: 
{
  "File": "fs/netfs/objects.c",
  "FirstLine": 210,
  "LineCount": 40
}

Results: 
{
  "Contents": " 210:\tstruct netfs_io_subrequest *netfs_alloc_subrequest(struct netfs_io_request *rreq)\n 211:\t{\n 212:\t\tstruct netfs_io_subrequest *subreq;\n 213:\t\tmempool_t *mempool = rreq-\u003enetfs_ops-\u003esubrequest_pool ?: \u0026netfs_subrequest_pool;\n 214:\t\tstruct kmem_cache *cache = mempool-\u003epool_data;\n 215:\t\n 216:\t\tif (rreq-\u003egfp == GFP_KERNEL)\n 217:\t\t\tsubreq = netfs_mempool_alloc_noreserve(mempool, rreq-\u003egfp);\n 218:\t\telse\n 219:\t\t\tsubreq = mempool_alloc(mempool, rreq-\u003egfp);\n 220:\t\tif (!subreq)\n 221:\t\t\treturn NULL;\n 222:\t\n 223:\t\tmemset(subreq, 0, kmem_cache_size(cache));\n 224:\t\tINIT_WORK(\u0026subreq-\u003ework, NULL);\n 225:\t\tINIT_LIST_HEAD(\u0026subreq-\u003erreq_link);\n 226:\t\trefcount_set(\u0026subreq-\u003eref, 2);\n 227:\t\tsubreq-\u003erreq = rreq;\n 228:\t\tsubreq-\u003edebug_index = atomic_inc_return(\u0026rreq-\u003esubreq_counter);\n 229:\t\tnetfs_get_request(rreq, netfs_rreq_trace_get_subreq);\n 230:\t\tnetfs_stat(\u0026netfs_n_rh_sreq);\n 231:\t\treturn subreq;\n 232:\t}\n 233:\t\n 234:\tvoid netfs_get_subrequest(struct netfs_io_subrequest *subreq,\n 235:\t\t\t\t  enum netfs_sreq_ref_trace what)\n 236:\t{\n 237:\t\tint r;\n 238:\t\n 239:\t\t__refcount_inc(\u0026subreq-\u003eref, \u0026r);\n 240:\t\ttrace_netfs_sreq_ref(subreq-\u003erreq-\u003edebug_id, subreq-\u003edebug_index, r + 1,\n 241:\t\t\t\t     what);\n 242:\t}\n 243:\t\n 244:\tstatic void netfs_free_subrequest(struct netfs_io_subrequest *subreq)\n 245:\t{\n 246:\t\tstruct netfs_io_request *rreq = subreq-\u003erreq;\n 247:\t\n 248:\t\ttrace_netfs_sreq(subreq, netfs_sreq_trace_free);\n 249:\t\tif (rreq-\u003enetfs_ops-\u003efree_subrequest)\n"
}
55/3 2026/09/24 04:39 llm kmsan-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 16953
							output: 37
							thoughts: 55

Thoughts: 
Okay, here's my interpretation of that thought process, tailored for an expert audience:

**Memory Initialization and Code Inspection**

Alright, so the `subreq` structure is being zeroed out. Line 223 uses `memset` to ensure a clean slate, initializing the memory allocated for the `subreq` to zero. That's good practice, especially in a kernel context. We don't want any garbage data lingering around.  Always a good sanity check.

Now, I need to understand what's *supposed* to be happening with that memory. Let me jump into the `fs/netfs/rolling_buffer.c` file and see how this `subreq` is utilized.  I'll need to see how the allocation, initialization, and usage of this structure interrelate to fully understand its role.  I'm looking for the context.

56/3 2026/09/24 04:39 tool read-file
0m Args: 
{
  "File": "fs/netfs/rolling_buffer.c",
  "FirstLine": 20,
  "LineCount": 40
}

Results: 
{
  "Contents": "  20:\t * @gfp: Allocation constraints\n  21:\t * @trace: Trace tag to indicate the purpose of the allocation\n  22:\t *\n  23:\t * Allocate, initialise and account the folio_queue struct and log a trace line\n  24:\t * to mark the allocation.\n  25:\t */\n  26:\tstruct folio_queue *netfs_folioq_alloc(unsigned int rreq_id, gfp_t gfp,\n  27:\t\t\t\t\t       unsigned int /*enum netfs_folioq_trace*/ trace)\n  28:\t{\n  29:\t\tstruct folio_queue *fq;\n  30:\t\n  31:\t\tif (gfp == GFP_KERNEL)\n  32:\t\t\tfq = netfs_mempool_alloc_noreserve(\u0026netfs_folioq_pool, gfp);\n  33:\t\telse\n  34:\t\t\tfq = mempool_alloc(\u0026netfs_folioq_pool, gfp);\n  35:\t\tif (fq) {\n  36:\t\t\tnetfs_stat(\u0026netfs_n_folioq);\n  37:\t\t\tfolioq_init(fq, rreq_id);\n  38:\t\t\tfq-\u003edebug_id = atomic_inc_return(\u0026debug_ids);\n  39:\t\t\ttrace_netfs_folioq(fq, trace);\n  40:\t\t}\n  41:\t\treturn fq;\n  42:\t}\n  43:\tEXPORT_SYMBOL(netfs_folioq_alloc);\n  44:\t\n  45:\t/**\n  46:\t * netfs_folioq_free - Free a folio_queue struct\n  47:\t * @folioq: The object to free\n  48:\t * @trace: Trace tag to indicate which free\n  49:\t *\n  50:\t * Free and unaccount the folio_queue struct.\n  51:\t */\n  52:\tvoid netfs_folioq_free(struct folio_queue *folioq,\n  53:\t\t\t       unsigned int /*enum netfs_trace_folioq*/ trace)\n  54:\t{\n  55:\t\ttrace_netfs_folioq(folioq, trace);\n  56:\t\tnetfs_stat_d(\u0026netfs_n_folioq);\n  57:\t\tmempool_free(folioq, \u0026netfs_folioq_pool);\n  58:\t}\n  59:\tEXPORT_SYMBOL(netfs_folioq_free);\n"
}
57/3 2026/09/24 04:39 llm kmsan-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 17847
							output: 19
							thoughts: 20

Thoughts: 
Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Investigating `folioq_init`**

Alright, let's get down to brass tacks. I'm looking at `folioq_init`, and my immediate thought is, "What exactly is this function doing?" It's clear from its name that it likely pertains to initialization, but I need to dig deeper. My next step is obvious: I need to scrutinize the code itself. Let's dive into the definition of `folioq_init` and dissect its purpose. I'll be looking for clues about the data structures it sets up, the resources it allocates, any configuration it loads, and how it interacts with other modules or components within the system. Understanding this function is critical to grasping the overall flow.

58/3 2026/09/24 04:39 tool grepper
0m Args: 
{
  "Expression": "void folioq_init"
}

Results: 
{
  "Output": "Documentation/core-api/folio_queue.rst=62=A segment should be initialised by calling::\nDocumentation/core-api/folio_queue.rst-63-\nDocumentation/core-api/folio_queue.rst:64:\tvoid folioq_init(struct folio_queue *folioq);\nDocumentation/core-api/folio_queue.rst-65-\n--\ninclude/linux/folio_queue.h=30=struct folio_queue {\n--\ninclude/linux/folio_queue.h-52- */\ninclude/linux/folio_queue.h:53:static inline void folioq_init(struct folio_queue *folioq, unsigned int rreq_id)\ninclude/linux/folio_queue.h-54-{\n"
}
59/3 2026/09/24 04:39 llm kmsan-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 18246
							output: 36
							thoughts: 15

Thoughts: 
Here's my take on the thought process, tailored for an expert audience:

**Diving into Folio Queuing – Let's Get Specific**

Okay, so we're looking at some folio-related stuff, and my gut feeling is that the core queuing mechanisms are likely defined within the `include/linux/folio_queue.h` header. Before I start debugging anything or making any assumptions, I need to get a clear picture of how the kernel manages folios within queues, especially considering the performance implications of how this is handled. This is where the core definitions and data structures live. I know a lot of the higher-level functions will probably use abstractions, but the foundations are likely defined here. So, let’s dig in, and see what the header has to offer. I need to understand the fundamental building blocks before I can even consider the implications for memory management or any potential contention issues.

60/3 2026/09/24 04:39 tool read-file
0m Args: 
{
  "File": "include/linux/folio_queue.h",
  "FirstLine": 30,
  "LineCount": 40
}

Results: 
{
  "Contents": "  30:\tstruct folio_queue {\n  31:\t\tstruct folio_batch\tvec;\t\t/* Folios in the queue segment */\n  32:\t\tu8\t\t\torders[FOLIO_BATCH_SIZE]; /* Order of each folio */\n  33:\t\tstruct folio_queue\t*next;\t\t/* Next queue segment or NULL */\n  34:\t\tstruct folio_queue\t*prev;\t\t/* Previous queue segment of NULL */\n  35:\t\tunsigned long\t\tmarks;\t\t/* 1-bit mark per folio */\n  36:\t\tunsigned long\t\tmarks2;\t\t/* Second 1-bit mark per folio */\n  37:\t#if FOLIO_BATCH_SIZE \u003e BITS_PER_LONG\n  38:\t#error marks is not big enough\n  39:\t#endif\n  40:\t\tunsigned int\t\trreq_id;\n  41:\t\tunsigned int\t\tdebug_id;\n  42:\t};\n  43:\t\n  44:\t/**\n  45:\t * folioq_init - Initialise a folio queue segment\n  46:\t * @folioq: The segment to initialise\n  47:\t * @rreq_id: The request identifier to use in tracelines.\n  48:\t *\n  49:\t * Initialise a folio queue segment and set an identifier to be used in traces.\n  50:\t *\n  51:\t * Note that the folio pointers are left uninitialised.\n  52:\t */\n  53:\tstatic inline void folioq_init(struct folio_queue *folioq, unsigned int rreq_id)\n  54:\t{\n  55:\t\tfolio_batch_init(\u0026folioq-\u003evec);\n  56:\t\tfolioq-\u003enext = NULL;\n  57:\t\tfolioq-\u003eprev = NULL;\n  58:\t\tfolioq-\u003emarks = 0;\n  59:\t\tfolioq-\u003emarks2 = 0;\n  60:\t\tfolioq-\u003erreq_id = rreq_id;\n  61:\t\tfolioq-\u003edebug_id = 0;\n  62:\t}\n  63:\t\n  64:\t/**\n  65:\t * folioq_nr_slots: Query the capacity of a folio queue segment\n  66:\t * @folioq: The segment to query\n  67:\t *\n  68:\t * Query the number of folios that a particular folio queue segment might hold.\n  69:\t * [!] NOTE: This must not be assumed to be the same for every segment!\n"
}
61/3 2026/09/24 04:39 llm kmsan-evaluator
0m Model: 
gemini-3.8-flash

Args: 
null

Results: 
null

Tokens: 
							input: 19103
							output: 244
							thoughts: 488

Thoughts: 
**Analyzing the Mempool Allocation Change**

Okay, let's break this down. From what I see, `alloc_hooks(...)` is essentially a wrapper. It's taking the existing allocation function call, `(_pool)->alloc(_gfp, (_pool)->pool_data)`, and simply enclosing it. Before, it was a direct call: `mempool->alloc(gfp, mempool->pool_data)`. Now, it's this new `netfs_mempool_alloc_noreserve(mempool, gfp)` which expands to `alloc_hooks((mempool)->alloc(gfp, (mempool)->pool_data))`. So, the core allocation logic *itself* hasn't changed.

It appears this is just about adding hooks for memory profiling, specifically for `CONFIG_MEM_ALLOC_PROFILING`. The goal is to make sure allocations via `pool->alloc()` are correctly attributed in the kernel memory profiler, rather than just showing up as `mempool_alloc()`.

Now, the important questions: Does this change alter buffer initialization at all? No, the underlying allocation and subsequent initialization are untouched. Does it involve copying data to userspace? No. Does it introduce any branching on uninitialized data? No. Does it modify bounds, lengths, or logic in a way that introduces any risk? No. Does this expose any uninitialized memory risks? Absolutely not.

I'll double-check this against the KMSAN criteria.

1.  Kernel structures sent to user space: Not applicable here.
2.  Conditional logic based on potentially uninitialized variables: Not applicable.
3.  Complex data structure allocation/initialization with potential uninitialized reads: The patch does *not* touch allocation size, content, or initialization. It is simply wrapping an existing call, which eliminates any concern here.
4.  Bounds checks that expose uninitialized bytes: Not applicable.

Given all of that, it seems crystal clear that `NeedsKMSAN` should be false. The patch doesn't introduce any risk of uninitialized memory usage or information leaks. I'm confident in calling `set-results`.

62/3 2026/09/24 04:39 tool set-results
0m Args: 
{
  "KMSANReasoning": "The patch introduces the helper macro `netfs_mempool_alloc_noreserve(_pool, _gfp)`, which wraps direct calls to `(_pool)-\u003ealloc()` in `alloc_hooks(...)` for allocation profiling (`CONFIG_MEM_ALLOC_PROFILING`). It replaces direct invocations of `mempool-\u003ealloc(gfp, mempool-\u003epool_data)` with this macro across `fs/netfs/objects.c` and `fs/netfs/rolling_buffer.c`.\n\nThe change does not alter the allocation behavior, object size, memory layout, or initialization of the allocated structures (`netfs_io_request`, `netfs_io_subrequest`, or `folio_queue`). All allocated objects continue to be initialized as before (e.g., zeroed via `memset`). No new data is exposed to user space, nor is any control flow altered based on uninitialized memory. Therefore, no uninitialized memory risks or info-leaks are introduced, and a dedicated KMSAN session is not needed.",
  "NeedsKMSAN": false
}

Results: 
{
  "KMSANReasoning": "The patch introduces the helper macro `netfs_mempool_alloc_noreserve(_pool, _gfp)`, which wraps direct calls to `(_pool)-\u003ealloc()` in `alloc_hooks(...)` for allocation profiling (`CONFIG_MEM_ALLOC_PROFILING`). It replaces direct invocations of `mempool-\u003ealloc(gfp, mempool-\u003epool_data)` with this macro across `fs/netfs/objects.c` and `fs/netfs/rolling_buffer.c`.\n\nThe change does not alter the allocation behavior, object size, memory layout, or initialization of the allocated structures (`netfs_io_request`, `netfs_io_subrequest`, or `folio_queue`). All allocated objects continue to be initialized as before (e.g., zeroed via `memset`). No new data is exposed to user space, nor is any control flow altered based on uninitialized memory. Therefore, no uninitialized memory risks or info-leaks are introduced, and a dedicated KMSAN session is not needed.",
  "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)