AI Trajectory

null

{
  "EnableConfigs": [
    "BPF_SYSCALL",
    "BPF_EVENTS",
    "PERF_EVENTS",
    "PROVE_LOCKING",
    "KPROBE_EVENTS"
  ],
  "FocusSymbols": [
    "trace_call_bpf"
  ],
  "Reasoning": "The patch functionally modifies `trace_call_bpf` to disable lockdep tracking while executing BPF programs attached to tracepoints with the `TRACE_EVENT_FL_BPF_NO_LOCKDEP` flag (such as `lock_release`). This is a reachable core kernel change that affects BPF tracing behavior and should be fuzzed to ensure it doesn't introduce regressions or unexpected behavior when BPF programs interact with locks.",
  "WorthFuzzing": true
}

null

{
  "PatchDiff": "commit e5461d4515c4109090d31ac9c258b11d7314915f\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Mon Aug 3 11:23:11 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/include/linux/trace_events.h b/include/linux/trace_events.h\nindex 308c76b57d132..6f67b5e9e38d6 100644\n--- a/include/linux/trace_events.h\n+++ b/include/linux/trace_events.h\n@@ -330,6 +330,7 @@ enum {\n \tTRACE_EVENT_FL_FPROBE_BIT,\n \tTRACE_EVENT_FL_CUSTOM_BIT,\n \tTRACE_EVENT_FL_TEST_STR_BIT,\n+\tTRACE_EVENT_FL_BPF_NO_LOCKDEP_BIT,\n };\n \n /*\n@@ -347,6 +348,7 @@ enum {\n  *                   This is set when the custom event has not been attached\n  *                   to a tracepoint yet, then it is cleared when it is.\n  *  TEST_STR      - The event has a \"%s\" that points to a string outside the event\n+ *  BPF_NO_LOCKDEP - Disable lockdep while running attached BPF programs\n  */\n enum {\n \tTRACE_EVENT_FL_CAP_ANY\t\t= (1 \u003c\u003c TRACE_EVENT_FL_CAP_ANY_BIT),\n@@ -360,6 +362,7 @@ enum {\n \tTRACE_EVENT_FL_FPROBE\t\t= (1 \u003c\u003c TRACE_EVENT_FL_FPROBE_BIT),\n \tTRACE_EVENT_FL_CUSTOM\t\t= (1 \u003c\u003c TRACE_EVENT_FL_CUSTOM_BIT),\n \tTRACE_EVENT_FL_TEST_STR\t\t= (1 \u003c\u003c TRACE_EVENT_FL_TEST_STR_BIT),\n+\tTRACE_EVENT_FL_BPF_NO_LOCKDEP\t= (1 \u003c\u003c TRACE_EVENT_FL_BPF_NO_LOCKDEP_BIT),\n };\n \n #define TRACE_EVENT_FL_UKPROBE (TRACE_EVENT_FL_KPROBE | TRACE_EVENT_FL_UPROBE)\ndiff --git a/include/trace/events/lock.h b/include/trace/events/lock.h\nindex 1ded869cd619f..5ccf5c54e3d2d 100644\n--- a/include/trace/events/lock.h\n+++ b/include/trace/events/lock.h\n@@ -72,6 +72,8 @@ DEFINE_EVENT(lock, lock_release,\n \tTP_ARGS(lock, ip)\n );\n \n+TRACE_EVENT_FLAGS(lock_release, TRACE_EVENT_FL_BPF_NO_LOCKDEP);\n+\n #ifdef CONFIG_LOCK_STAT\n \n DEFINE_EVENT(lock, lock_contended,\ndiff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c\nindex 75495a5c35079..f2460f3c860e0 100644\n--- a/kernel/trace/bpf_trace.c\n+++ b/kernel/trace/bpf_trace.c\n@@ -24,6 +24,7 @@\n #include \u003clinux/key.h\u003e\n #include \u003clinux/namei.h\u003e\n #include \u003clinux/file.h\u003e\n+#include \u003clinux/lockdep.h\u003e\n \n #include \u003cnet/bpf_sk_storage.h\u003e\n \n@@ -110,6 +111,7 @@ static u64 bpf_uprobe_multi_entry_ip(struct bpf_run_ctx *ctx);\n  */\n unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx)\n {\n+\tbool no_lockdep = call-\u003eflags \u0026 TRACE_EVENT_FL_BPF_NO_LOCKDEP;\n \tunsigned int ret;\n \n \tcant_sleep();\n@@ -144,8 +146,12 @@ unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx)\n \t * rcu_dereference() which is accepted risk.\n \t */\n \trcu_read_lock();\n+\tif (no_lockdep)\n+\t\tlockdep_off();\n \tret = bpf_prog_run_array(rcu_dereference(call-\u003eprog_array),\n \t\t\t\t ctx, bpf_prog_run);\n+\tif (no_lockdep)\n+\t\tlockdep_on();\n \trcu_read_unlock();\n \n  out:\n"
}

best-expensive

null

{
  "EnableConfigs": [
    "BPF_SYSCALL",
    "BPF_EVENTS",
    "PERF_EVENTS",
    "PROVE_LOCKING",
    "KPROBE_EVENTS"
  ],
  "FocusSymbols": [
    "trace_call_bpf"
  ],
  "Reasoning": "The patch functionally modifies `trace_call_bpf` to disable lockdep tracking while executing BPF programs attached to tracepoints with the `TRACE_EVENT_FL_BPF_NO_LOCKDEP` flag (such as `lock_release`). This is a reachable core kernel change that affects BPF tracing behavior and should be fuzzed to ensure it doesn't introduce regressions or unexpected behavior when BPF programs interact with locks.",
  "WorthFuzzing": true
}

You are an expert Linux kernel maintainer.
Your job is to review a provided patch series and determine
if it makes functional changes to the kernel that should be fuzzed.

IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively
use your code access tools to examine the actual source code and confirm any assumptions.

Return WorthFuzzing=false if the patch only contains:
- Modifications to Documentation/, Kconfig files, or code comments.
- Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints.
- Changes to numeric constants or macros that do not functionally alter execution flow.
- Code paths that are impossible to reach in virtualized environments like GCE or QEMU,
  even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim).
- Code in vendor-specific PCIe switch, SmartNIC, or GPU drivers (e.g., mlxsw, pds_core, qed,
  ionic, amdgpu) that require physical PCIe hardware cards not emulated in standard QEMU.
- Driver .remove, .shutdown, or pci_unregister_driver teardown callbacks (e.g., igb_remove)
  that are executed only during PCI hot-unplug or sysfs driver unbind operations.

If it modifies reachable core kernel logic, drivers, or architectures, use your code search
tools to verify the code can be executed, then return WorthFuzzing=true.

When returning WorthFuzzing=true, you MUST ALSO:
1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols.
   Avoid listing generic hot-path functions to prevent skewed test distributions.
   Prefer non-static, non-inlined API entrypoint functions over internal static helper functions
   (which are inlined by the compiler and do not have distinct symbol addresses).
2. Identify any specific CONFIG_ options required to properly test this new/modified feature.
   Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions.
   Also check "depends on" lines in Kconfig to include any non-standard parent subsystem configs
   needed for Kbuild to compile the code statically into vmlinux. List them in the EnableConfigs
   output array, and DO NOT add a '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.

For your convenience, here is the diff of the changes:
commit e5461d4515c4109090d31ac9c258b11d7314915f
Author: syz-cluster <triage@syzkaller.com>
Date:   Mon Aug 3 11:23:11 2026 +0000

    syz-cluster: applied patch under review

diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
index 308c76b57d132..6f67b5e9e38d6 100644
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -330,6 +330,7 @@ enum {
 	TRACE_EVENT_FL_FPROBE_BIT,
 	TRACE_EVENT_FL_CUSTOM_BIT,
 	TRACE_EVENT_FL_TEST_STR_BIT,
+	TRACE_EVENT_FL_BPF_NO_LOCKDEP_BIT,
 };
 
 /*
@@ -347,6 +348,7 @@ enum {
  *                   This is set when the custom event has not been attached
  *                   to a tracepoint yet, then it is cleared when it is.
  *  TEST_STR      - The event has a "%s" that points to a string outside the event
+ *  BPF_NO_LOCKDEP - Disable lockdep while running attached BPF programs
  */
 enum {
 	TRACE_EVENT_FL_CAP_ANY		= (1 << TRACE_EVENT_FL_CAP_ANY_BIT),
@@ -360,6 +362,7 @@ enum {
 	TRACE_EVENT_FL_FPROBE		= (1 << TRACE_EVENT_FL_FPROBE_BIT),
 	TRACE_EVENT_FL_CUSTOM		= (1 << TRACE_EVENT_FL_CUSTOM_BIT),
 	TRACE_EVENT_FL_TEST_STR		= (1 << TRACE_EVENT_FL_TEST_STR_BIT),
+	TRACE_EVENT_FL_BPF_NO_LOCKDEP	= (1 << TRACE_EVENT_FL_BPF_NO_LOCKDEP_BIT),
 };
 
 #define TRACE_EVENT_FL_UKPROBE (TRACE_EVENT_FL_KPROBE | TRACE_EVENT_FL_UPROBE)
diff --git a/include/trace/events/lock.h b/include/trace/events/lock.h
index 1ded869cd619f..5ccf5c54e3d2d 100644
--- a/include/trace/events/lock.h
+++ b/include/trace/events/lock.h
@@ -72,6 +72,8 @@ DEFINE_EVENT(lock, lock_release,
 	TP_ARGS(lock, ip)
 );
 
+TRACE_EVENT_FLAGS(lock_release, TRACE_EVENT_FL_BPF_NO_LOCKDEP);
+
 #ifdef CONFIG_LOCK_STAT
 
 DEFINE_EVENT(lock, lock_contended,
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 75495a5c35079..f2460f3c860e0 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -24,6 +24,7 @@
 #include <linux/key.h>
 #include <linux/namei.h>
 #include <linux/file.h>
+#include <linux/lockdep.h>
 
 #include <net/bpf_sk_storage.h>
 
@@ -110,6 +111,7 @@ static u64 bpf_uprobe_multi_entry_ip(struct bpf_run_ctx *ctx);
  */
 unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx)
 {
+	bool no_lockdep = call->flags & TRACE_EVENT_FL_BPF_NO_LOCKDEP;
 	unsigned int ret;
 
 	cant_sleep();
@@ -144,8 +146,12 @@ unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx)
 	 * rcu_dereference() which is accepted risk.
 	 */
 	rcu_read_lock();
+	if (no_lockdep)
+		lockdep_off();
 	ret = bpf_prog_run_array(rcu_dereference(call->prog_array),
 				 ctx, bpf_prog_run);
+	if (no_lockdep)
+		lockdep_on();
 	rcu_read_unlock();
 
  out:

gemini-3.1-pro-preview

null

null

							input: 2945
							output: 29
							thoughts: 225
						

**Fuzzing Feasibility of the Lockdep Disabling Patch**

Okay, so I've been looking at this patch and I need to figure out if fuzzing it is a worthwhile effort. Essentially, it introduces a new flag, `TRACE_EVENT_FL_BPF_NO_LOCKDEP`, and applies it to the `lock_release` trace event. The real meat of the change is in `trace_call_bpf`, where it disables lockdep when a BPF program is running if this new flag is present.

From a functional perspective, it's pretty straightforward: we're disabling lockdep around the execution of `bpf_prog_run_array`. The critical question is whether or not this is *reachable* by a fuzzer. And it is. This is triggered by attaching a BPF program to a tracepoint – specifically `lock_release`, since this flag is set there. This makes me consider the conditions I need to reproduce the scenario.

So next, I need to figure out what config options are required to enable this functionality. The change happens within `kernel/trace/bpf_trace.c`. I know that this file is compiled when `CONFIG_BPF_EVENTS` is enabled. I need to now check either `kernel/trace/Makefile` or `init/Kconfig` to confirm that this is true and to see how to actually enable `BPF_EVENTS`.

{
  "Expression": "BPF_EVENTS",
  "PathPrefix": "kernel/trace/Makefile"
}

{
  "Output": "kernel/trace/Makefile=109=obj-$(CONFIG_USER_EVENTS) += trace_events_user.o\nkernel/trace/Makefile:110:obj-$(CONFIG_BPF_EVENTS) += bpf_trace.o\nkernel/trace/Makefile-111-obj-$(CONFIG_KPROBE_EVENTS) += trace_kprobe.o\n"
}

gemini-3.1-pro-preview

null

null

							input: 3596
							output: 25
							thoughts: 26
						

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

**Investigating BPF Event Configuration**

Right, so I need to figure out where the `BPF_EVENTS` configuration option is defined. Makes sense to start with the obvious candidates: the initialization code and the tracing infrastructure. The `init/Kconfig` file is a good starting point, as it's where core system features are often configured. Alternatively, because BPF is heavily involved in tracing and instrumentation, the `kernel/trace/Kconfig` file is another highly likely location. Let's start by checking those two files – that should point me in the right direction.

{
  "Expression": "config BPF_EVENTS",
  "PathPrefix": ""
}

{
  "Output": "kernel/trace/Kconfig=839=config EPROBE_EVENTS\n--\nkernel/trace/Kconfig-852-\nkernel/trace/Kconfig:853:config BPF_EVENTS\nkernel/trace/Kconfig-854-\tdepends on BPF_SYSCALL\n"
}

gemini-3.1-pro-preview

null

null

							input: 3872
							output: 34
							thoughts: 13
						

Here's my analysis of the request:

**Deconstructing `BPF_EVENTS` Dependencies**

Okay, so they want me to dissect the dependencies related to `BPF_EVENTS`. My immediate instinct is to think about it from a systems perspective, as I would if I were architecting a tracing framework. First, I need to understand what "dependencies" actually means in this context. Is it the upstream kernel subsystems that feed into the `BPF_EVENTS` infrastructure? Are we talking about the downstream applications or tools that *consume* the events? Or perhaps both?

I'd start by looking at the kernel source code, specifically around the BPF event-related structures and functions. I'd be searching for includes, function calls, and data structures that directly interact with `BPF_EVENTS`. I need to figure out where the data originates, the processing steps it goes through, and how it is ultimately exposed.

My primary focus will be on these areas:

*   **Upstream Kernel Components:** Where does the actual event data come from? Tracepoints, perf events, kprobes, uprobes, USDT, etc.? How is the data structured before it gets into the BPF pipeline? What synchronization mechanisms are involved? Are there any shared resources?
*   **BPF Helper Functions:** What BPF helper functions are specifically designed for working with `BPF_EVENTS`? `bpf_perf_event_read()`, `bpf_trace_printk()` are good starting points. How do they handle data buffering, filtering, and delivery?
*   **Downstream Consumers:** How do BPF programs read and interpret the events? What BPF data structures (e.g., ring buffers, maps) are typically used for this purpose? Is there a standard way to format or serialize the event data?
*   **Libbpf:** What's the relationship between the `BPF_EVENTS` infrastructure and the `libbpf` library? How does `libbpf` facilitate the loading, attaching, and interaction with BPF programs? Are there any specific `libbpf` functions related to events?

I'll also keep an eye out for potential performance bottlenecks or limitations. Are there any known scalability issues with `BPF_EVENTS` under high load? Are there any lock contention issues that I need to be aware of? Are there any memory management considerations? I'll probably cross-reference it with any historical documentation and commits, to get the bigger picture of the reasons that went into the architecture.

{
  "File": "kernel/trace/Kconfig",
  "FirstLine": 850,
  "LineCount": 20
}

{
  "Contents": " 850:\t\t  convert the type of an event field. For example, turn an\n 851:\t\t  address into a string.\n 852:\t\n 853:\tconfig BPF_EVENTS\n 854:\t\tdepends on BPF_SYSCALL\n 855:\t\tdepends on (KPROBE_EVENTS || UPROBE_EVENTS) \u0026\u0026 PERF_EVENTS\n 856:\t\tbool\n 857:\t\tdefault y\n 858:\t\thelp\n 859:\t\t  This allows the user to attach BPF programs to kprobe, uprobe, and\n 860:\t\t  tracepoint events.\n 861:\t\n 862:\tconfig DYNAMIC_EVENTS\n 863:\t\tdef_bool n\n 864:\t\n 865:\tconfig PROBE_EVENTS\n 866:\t\tdef_bool n\n 867:\t\n 868:\tconfig BPF_KPROBE_OVERRIDE\n 869:\t\tbool \"Enable BPF programs to override a kprobed function\"\n"
}

gemini-3.1-pro-preview

null

null

							input: 4724
							output: 33
							thoughts: 143
						

**My Assessment of BPF Event Dependencies**

Okay, let's break this down. It seems `BPF_EVENTS` hinges on a few key components. Specifically, `BPF_SYSCALL`, and either `KPROBE_EVENTS` or `UPROBE_EVENTS` (or both), plus `PERF_EVENTS`. The default configuration, it appears, is to enable this if all those prerequisites are satisfied. That makes sense, a clean and logical dependency structure.

Now, the use of `lockdep_off()` and `lockdep_on()` caught my eye. They seem important here, so naturally, I need `CONFIG_LOCKDEP` to be enabled for them to actually *do* anything meaningful. I seem to recall that they’re still defined as empty macros if `CONFIG_LOCKDEP` is not set, though. Let me just confirm where those are defined... Ah, right, they're in `include/linux/lockdep.h`. Okay, time to double-check that header file and make sure I fully understand their usage context here.

{
  "Expression": "define lockdep_off",
  "PathPrefix": "include/linux/lockdep.h"
}

{
  "Output": "include/linux/lockdep.h=95=extern void lockdep_init_task(struct task_struct *task);\n--\ninclude/linux/lockdep.h-108-\ninclude/linux/lockdep.h:109:#define lockdep_off()\t\t\t\t\t\\\ninclude/linux/lockdep.h-110-do {\t\t\t\t\t\t\t\\\n"
}

gemini-3.1-pro-preview

null

null

							input: 5225
							output: 33
							thoughts: 18
						

Okay, here's my interpretation of that thought process, from an expert's perspective:

**Investigating a Potentially Empty Definition**

Hmm, interesting. My initial thought is to check if there's an actual, defined function or macro associated with `lockdep_off`. It's a common pattern, especially in kernel development. Sometimes, these debugging or control mechanisms are conditionally compiled, or even defined as "nothing" under certain configurations. I'm likely looking for a situation where `lockdep_off` might be defined as an empty macro, or perhaps even a function that's completely stubbed out. This means it either does nothing, or is disabled altogether. I need to understand if the kernel is using it to disable lock dependency checking, or if it has been compiled without lock dependency checking, as this would change how the lock dependencies are analysed. I'm going to look more closely to see if there's any implementation attached to it.

{
  "Expression": "define lockdep_off",
  "PathPrefix": "include/linux/lockdep.h"
}

{
  "Output": "include/linux/lockdep.h=95=extern void lockdep_init_task(struct task_struct *task);\n--\ninclude/linux/lockdep.h-108-\ninclude/linux/lockdep.h:109:#define lockdep_off()\t\t\t\t\t\\\ninclude/linux/lockdep.h-110-do {\t\t\t\t\t\t\t\\\n"
}

gemini-3.1-pro-preview

null

null

							input: 5573
							output: 36
							thoughts: 21
						

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

**Diving into lockdep.h**

Okay, so I need to refresh my memory on some lockdep internals. Specifically, I'm thinking about the data structures and perhaps some of the fundamental concepts used within the kernel's lock dependency validator. Let's start by zeroing in on `include/linux/lockdep.h`, around line 109. That's usually a good spot to get a high-level view of the key definitions – likely where the core lockdep structures like `struct lock_class`, `struct lockdep_map` or potentially even some of the crucial macros that are the building blocks of lock analysis are defined. I expect to see the basic structure definitions – what data is stored about locks, which likely includes information about the lock's class, usage context, and potentially dependency relationships it forms with other locks. The line number is a suggestion. We'll find out, shortly.

{
  "File": "include/linux/lockdep.h",
  "FirstLine": 100,
  "LineCount": 30
}

{
  "Contents": " 100:\t#define LOCKDEP_RECURSION_BITS\t16\n 101:\t#define LOCKDEP_OFF\t\t(1U \u003c\u003c LOCKDEP_RECURSION_BITS)\n 102:\t#define LOCKDEP_RECURSION_MASK\t(LOCKDEP_OFF - 1)\n 103:\t\n 104:\t/*\n 105:\t * lockdep_{off,on}() are macros to avoid tracing and kprobes; not inlines due\n 106:\t * to header dependencies.\n 107:\t */\n 108:\t\n 109:\t#define lockdep_off()\t\t\t\t\t\\\n 110:\tdo {\t\t\t\t\t\t\t\\\n 111:\t\tcurrent-\u003elockdep_recursion += LOCKDEP_OFF;\t\\\n 112:\t} while (0)\n 113:\t\n 114:\t#define lockdep_on()\t\t\t\t\t\\\n 115:\tdo {\t\t\t\t\t\t\t\\\n 116:\t\tcurrent-\u003elockdep_recursion -= LOCKDEP_OFF;\t\\\n 117:\t} while (0)\n 118:\t\n 119:\textern void lockdep_register_key(struct lock_class_key *key);\n 120:\textern void lockdep_unregister_key(struct lock_class_key *key);\n 121:\t\n 122:\t/*\n 123:\t * These methods are used by specific locking variants (spinlocks,\n 124:\t * rwlocks, mutexes and rwsems) to pass init/acquire/release events\n 125:\t * to lockdep:\n 126:\t */\n 127:\t\n 128:\textern void lockdep_init_map_type(struct lockdep_map *lock, const char *name,\n 129:\t\tstruct lock_class_key *key, int subclass, u8 inner, u8 outer, u8 lock_type);\n"
}

gemini-3.1-pro-preview

null

null

							input: 6338
							output: 35
							thoughts: 30
						

Here's my thought process, as if I were analyzing that code:

**Analyzing Lockdep Definition**

Okay, first things first, `lockdep_off()`... where *is* that defined? I see the reference here, which is helpful. Now, the key is understanding how it's *conditionally* defined. I immediately need to look upstream for any `#ifdef` directives that might control its inclusion. My intuition tells me to see if it's dependent on `CONFIG_LOCKDEP`. I'll scan the preceding lines quickly. This is common practice, I want to see if the function definition is conditional in any way.

{
  "File": "include/linux/lockdep.h",
  "FirstLine": 1,
  "LineCount": 100
}

{
  "Contents": "   1:\t/* SPDX-License-Identifier: GPL-2.0 */\n   2:\t/*\n   3:\t * Runtime locking correctness validator\n   4:\t *\n   5:\t *  Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar \u003cmingo@redhat.com\u003e\n   6:\t *  Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra\n   7:\t *\n   8:\t * see Documentation/locking/lockdep-design.rst for more details.\n   9:\t */\n  10:\t#ifndef __LINUX_LOCKDEP_H\n  11:\t#define __LINUX_LOCKDEP_H\n  12:\t\n  13:\t#include \u003clinux/lockdep_types.h\u003e\n  14:\t#include \u003clinux/smp.h\u003e\n  15:\t#include \u003casm/percpu.h\u003e\n  16:\t\n  17:\tstruct task_struct;\n  18:\t\n  19:\t#ifdef CONFIG_LOCKDEP\n  20:\t\n  21:\t#include \u003clinux/linkage.h\u003e\n  22:\t#include \u003clinux/list.h\u003e\n  23:\t#include \u003clinux/debug_locks.h\u003e\n  24:\t#include \u003clinux/stacktrace.h\u003e\n  25:\t\n  26:\tstatic inline void lockdep_copy_map(struct lockdep_map *to,\n  27:\t\t\t\t\t    struct lockdep_map *from)\n  28:\t{\n  29:\t\tint i;\n  30:\t\n  31:\t\t*to = *from;\n  32:\t\t/*\n  33:\t\t * Since the class cache can be modified concurrently we could observe\n  34:\t\t * half pointers (64bit arch using 32bit copy insns). Therefore clear\n  35:\t\t * the caches and take the performance hit.\n  36:\t\t *\n  37:\t\t * XXX it doesn't work well with lockdep_set_class_and_subclass(), since\n  38:\t\t *     that relies on cache abuse.\n  39:\t\t */\n  40:\t\tfor (i = 0; i \u003c NR_LOCKDEP_CACHING_CLASSES; i++)\n  41:\t\t\tto-\u003eclass_cache[i] = NULL;\n  42:\t}\n  43:\t\n  44:\t/*\n  45:\t * Every lock has a list of other locks that were taken after it.\n  46:\t * We only grow the list, never remove from it:\n  47:\t */\n  48:\tstruct lock_list {\n  49:\t\tstruct list_head\t\tentry;\n  50:\t\tstruct lock_class\t\t*class;\n  51:\t\tstruct lock_class\t\t*links_to;\n  52:\t\tconst struct lock_trace\t\t*trace;\n  53:\t\tu16\t\t\t\tdistance;\n  54:\t\t/* bitmap of different dependencies from head to this */\n  55:\t\tu8\t\t\t\tdep;\n  56:\t\t/* used by BFS to record whether \"prev -\u003e this\" only has -(*R)-\u003e */\n  57:\t\tu8\t\t\t\tonly_xr;\n  58:\t\n  59:\t\t/*\n  60:\t\t * The parent field is used to implement breadth-first search, and the\n  61:\t\t * bit 0 is reused to indicate if the lock has been accessed in BFS.\n  62:\t\t */\n  63:\t\tstruct lock_list\t\t*parent;\n  64:\t};\n  65:\t\n  66:\t/**\n  67:\t * struct lock_chain - lock dependency chain record\n  68:\t *\n  69:\t * @irq_context: the same as irq_context in held_lock below\n  70:\t * @depth:       the number of held locks in this chain\n  71:\t * @base:        the index in chain_hlocks for this chain\n  72:\t * @entry:       the collided lock chains in lock_chain hash list\n  73:\t * @chain_key:   the hash key of this lock_chain\n  74:\t */\n  75:\tstruct lock_chain {\n  76:\t\t/* see BUILD_BUG_ON()s in add_chain_cache() */\n  77:\t\tunsigned int\t\t\tirq_context :  2,\n  78:\t\t\t\t\t\tdepth       :  6,\n  79:\t\t\t\t\t\tbase\t    : 24;\n  80:\t\t/* 4 byte hole */\n  81:\t\tstruct hlist_node\t\tentry;\n  82:\t\tu64\t\t\t\tchain_key;\n  83:\t};\n  84:\t\n  85:\t/*\n  86:\t * Initialization, self-test and debugging-output methods:\n  87:\t */\n  88:\textern void lockdep_init(void);\n  89:\textern void lockdep_reset(void);\n  90:\textern void lockdep_reset_lock(struct lockdep_map *lock);\n  91:\textern void lockdep_free_key_range(void *start, unsigned long size);\n  92:\textern asmlinkage void lockdep_sys_exit(void);\n  93:\textern void lockdep_set_selftest_task(struct task_struct *task);\n  94:\t\n  95:\textern void lockdep_init_task(struct task_struct *task);\n  96:\t\n  97:\t/*\n  98:\t * Split the recursion counter in two to readily detect 'off' vs recursion.\n  99:\t */\n 100:\t#define LOCKDEP_RECURSION_BITS\t16\n"
}

gemini-3.1-pro-preview

null

null

							input: 7949
							output: 33
							thoughts: 33
						

Okay, here's my interpretation of those thoughts, summarized from a first-person expert perspective:

**Lockdep Investigation**

Alright, let's see. My focus is on this section, which is clearly guarded by `#ifdef CONFIG_LOCKDEP`. Okay, that's expected. Lockdep is critical for detecting lock-related bugs, so that makes perfect sense. Now, if CONFIG_LOCKDEP isn't *defined*, what happens to `lockdep_off()`? That's the key question. I need to understand what that function does and how its absence is handled. Is it defined as a no-op? Does it get replaced with something else? Or, is the surrounding code completely removed? It's essential to trace this logic to understand the build configurations and how the system behaves when lockdep is disabled. Knowing how it's handled is vital for debugging and understanding potential lock-related issues in different build environments. I need to dig deeper into the codebase to find that definition (or lack thereof) to understand what's actually going on.

{
  "Expression": "define lockdep_off",
  "PathPrefix": "include/linux/lockdep.h"
}

{
  "Output": "include/linux/lockdep.h=95=extern void lockdep_init_task(struct task_struct *task);\n--\ninclude/linux/lockdep.h-108-\ninclude/linux/lockdep.h:109:#define lockdep_off()\t\t\t\t\t\\\ninclude/linux/lockdep.h-110-do {\t\t\t\t\t\t\t\\\n"
}

gemini-3.1-pro-preview

null

null

							input: 8333
							output: 36
							thoughts: 28
						

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

**Diving into lockdep.h's Conditional Logic**

Right, let's get down to brass tacks. I'm going to take a closer look at `include/linux/lockdep.h`, specifically the `#ifdef CONFIG_LOCKDEP` block. We need to be meticulous, and right now I'm particularly interested in the `#else` branch, the one that defines what happens when `CONFIG_LOCKDEP` *isn't* enabled. This is where the core, *uninstrumented* locking mechanisms are defined. A good understanding here is crucial for understanding the performance impact of `lockdep`, or the edge cases when you're running without its safety net. We need to really understand the fundamental baseline that's there.

{
  "File": "include/linux/lockdep.h",
  "FirstLine": 370,
  "LineCount": 50
}

{
  "Contents": " 370:\t\n 371:\tstatic inline void lockdep_register_key(struct lock_class_key *key)\n 372:\t{\n 373:\t}\n 374:\t\n 375:\tstatic inline void lockdep_unregister_key(struct lock_class_key *key)\n 376:\t{\n 377:\t}\n 378:\t\n 379:\t#define lockdep_depth(tsk)\t(0)\n 380:\t\n 381:\t/*\n 382:\t * Dummy forward declarations, allow users to write less ifdef-y code\n 383:\t * and depend on dead code elimination.\n 384:\t */\n 385:\textern int lock_is_held(const void *);\n 386:\textern int lockdep_is_held(const void *);\n 387:\t#define lockdep_is_held_type(l, r)\t\t(1)\n 388:\t\n 389:\t#define lockdep_assert(c)\t\t\tdo { } while (0)\n 390:\t#define lockdep_assert_once(c)\t\t\tdo { } while (0)\n 391:\t\n 392:\t#define lockdep_assert_held(l)\t\t\t__assume_ctx_lock(l)\n 393:\t#define lockdep_assert_not_held(l)\t\tdo { (void)(l); } while (0)\n 394:\t#define lockdep_assert_held_write(l)\t\t__assume_ctx_lock(l)\n 395:\t#define lockdep_assert_held_read(l)\t\t__assume_shared_ctx_lock(l)\n 396:\t#define lockdep_assert_held_once(l)\t\tdo { (void)(l); } while (0)\n 397:\t#define lockdep_assert_none_held_once()\tdo { } while (0)\n 398:\t\n 399:\t#define lockdep_recursing(tsk)\t\t\t(0)\n 400:\t\n 401:\t#define NIL_COOKIE (struct pin_cookie){ }\n 402:\t\n 403:\t#define lockdep_pin_lock(l)\t\t\t({ struct pin_cookie cookie = { }; cookie; })\n 404:\t#define lockdep_repin_lock(l, c)\t\tdo { (void)(l); (void)(c); } while (0)\n 405:\t#define lockdep_unpin_lock(l, c)\t\tdo { (void)(l); (void)(c); } while (0)\n 406:\t\n 407:\t#define DEFINE_WAIT_OVERRIDE_MAP(_name, _wait_type)\t\\\n 408:\t\tstruct lockdep_map __maybe_unused _name = {}\n 409:\t\n 410:\t#endif /* !LOCKDEP */\n 411:\t\n 412:\t#ifdef CONFIG_PROVE_LOCKING\n 413:\tvoid lockdep_set_lock_cmp_fn(struct lockdep_map *, lock_cmp_fn, lock_print_fn);\n 414:\t\n 415:\t#define lock_set_cmp_fn(lock, ...)\tlockdep_set_lock_cmp_fn(\u0026(lock)-\u003edep_map, __VA_ARGS__)\n 416:\t#else\n 417:\t#define lock_set_cmp_fn(lock, ...)\tdo { } while (0)\n 418:\t#endif\n 419:\t\n"
}

gemini-3.1-pro-preview

null

null

							input: 9496
							output: 32
							thoughts: 33
						

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

**Missing Piece Detected: Lockdep Discrepancy**

Hmm, something's not quite right. I'm reviewing this conditional branch, and I'm missing something important. Specifically, I'm not seeing the expected call to `lockdep_off()` within that `#else` block. That's a red flag. We usually need to ensure the lockdep setting is handled consistently across both branches. Let me quickly double-check my mental model here. Time to fire up the grep, just to be absolutely sure I'm not overlooking something obvious or have missed some downstream dependency or macro that hides it. Gotta verify `lockdep_off` isn't being invoked implicitly somewhere else in this part of the code. Let's see what turns up.

{
  "Expression": "lockdep_off",
  "PathPrefix": "include/linux/lockdep.h"
}

{
  "Output": "include/linux/lockdep.h=95=extern void lockdep_init_task(struct task_struct *task);\n--\ninclude/linux/lockdep.h-108-\ninclude/linux/lockdep.h:109:#define lockdep_off()\t\t\t\t\t\\\ninclude/linux/lockdep.h-110-do {\t\t\t\t\t\t\t\\\n--\ninclude/linux/lockdep.h=320=static inline void lockdep_init_task(struct task_struct *task)\n--\ninclude/linux/lockdep.h-323-\ninclude/linux/lockdep.h:324:static inline void lockdep_off(void)\ninclude/linux/lockdep.h-325-{\n"
}

gemini-3.1-pro-preview

null

null

							input: 9922
							output: 35
							thoughts: 118
						

**Analyzing the Conditional Function Definition**

Okay, so I'm looking at this code and it's pretty straightforward. I see that this function, whatever it is, is defined as a static inline function, but only within the `#else` branch of some preprocessor directive. That immediately tells me that it's going to be conditionally compiled. My first assumption, and I'll confirm this, is that the `CONFIG_LOCKDEP` configuration option is necessary for this function to actually *do* anything meaningful. Otherwise, it will likely be compiled out, or resolve to some null operation. I need to keep that in mind.

Now, this patch seems to be touching `trace_call_bpf`, and that rings a bell. `trace_call_bpf` is that function which is called when a BPF program is attached to a tracepoint. The tracepoint being modified is `lock_release`, and that's found in `include/trace/events/lock.h`. I'll want to review how `lock_release` is defined. The fact that it's in the `lock.h` file and involves `lock_release` makes me assume that it also must be defined conditionally under an `#ifdef CONFIG_LOCKDEP` guard. Let me quickly check the file.

{
  "File": "include/trace/events/lock.h",
  "FirstLine": 1,
  "LineCount": 50
}

{
  "Contents": "   1:\t/* SPDX-License-Identifier: GPL-2.0 */\n   2:\t#undef TRACE_SYSTEM\n   3:\t#define TRACE_SYSTEM lock\n   4:\t\n   5:\t#if !defined(_TRACE_LOCK_H) || defined(TRACE_HEADER_MULTI_READ)\n   6:\t#define _TRACE_LOCK_H\n   7:\t\n   8:\t#include \u003clinux/tracepoint.h\u003e\n   9:\t\n  10:\t/* flags for lock:contention_begin */\n  11:\t#define LCB_F_SPIN\t(1U \u003c\u003c 0)\n  12:\t#define LCB_F_READ\t(1U \u003c\u003c 1)\n  13:\t#define LCB_F_WRITE\t(1U \u003c\u003c 2)\n  14:\t#define LCB_F_RT\t(1U \u003c\u003c 3)\n  15:\t#define LCB_F_PERCPU\t(1U \u003c\u003c 4)\n  16:\t#define LCB_F_MUTEX\t(1U \u003c\u003c 5)\n  17:\t\n  18:\t\n  19:\t#ifdef CONFIG_LOCKDEP\n  20:\t\n  21:\t#include \u003clinux/lockdep.h\u003e\n  22:\t\n  23:\tTRACE_EVENT(lock_acquire,\n  24:\t\n  25:\t\tTP_PROTO(struct lockdep_map *lock, unsigned int subclass,\n  26:\t\t\tint trylock, int read, int check,\n  27:\t\t\tstruct lockdep_map *next_lock, unsigned long ip),\n  28:\t\n  29:\t\tTP_ARGS(lock, subclass, trylock, read, check, next_lock, ip),\n  30:\t\n  31:\t\tTP_STRUCT__entry(\n  32:\t\t\t__field(unsigned int, flags)\n  33:\t\t\t__string(name, lock-\u003ename)\n  34:\t\t\t__field(void *, lockdep_addr)\n  35:\t\t),\n  36:\t\n  37:\t\tTP_fast_assign(\n  38:\t\t\t__entry-\u003eflags = (trylock ? 1 : 0) | (read ? 2 : 0);\n  39:\t\t\t__assign_str(name);\n  40:\t\t\t__entry-\u003elockdep_addr = lock;\n  41:\t\t),\n  42:\t\n  43:\t\tTP_printk(\"%p %s%s%s\", __entry-\u003elockdep_addr,\n  44:\t\t\t  (__entry-\u003eflags \u0026 1) ? \"try \" : \"\",\n  45:\t\t\t  (__entry-\u003eflags \u0026 2) ? \"read \" : \"\",\n  46:\t\t\t  __get_str(name))\n  47:\t);\n  48:\t\n  49:\tDECLARE_EVENT_CLASS(lock,\n  50:\t\n"
}

gemini-3.1-pro-preview

null

null

							input: 11063
							output: 36
							thoughts: 359
						

**My Analysis of the Lockdep Disabling Patch**

Okay, so looking at this patch, it's clear that `lock_release` is guarded by `#ifdef CONFIG_LOCKDEP`. So, obviously, `CONFIG_LOCKDEP` is a requirement here. And, as expected, we also need both `CONFIG_BPF_EVENTS` and `CONFIG_BPF_SYSCALL` to be enabled, because we're talking about attaching BPF programs.

The core of this patch is that it's disabling lockdep when BPF programs are attached to `lock_release`. The idea is to prevent recursion or lockdep false positives. Makes sense; if the BPF program does things that trigger lockdep while we're *already* inside `lock_release` (which is itself called from lockdep), we're going to get noise or even crashes. Now, is this a functional change worth fuzzing? Yes, this is a definite yes. It's fundamentally altering core BPF tracing logic. If a BPF program is attached to `lock_release`, it will now run with lockdep disabled.

So, where should I direct my fuzzing efforts? It seems like `trace_call_bpf` is the key function to target. It's the point of entry for this whole thing. Now that I think about it, `trace_call_bpf` is called frequently if you've got many tracepoints with BPF programs attached. And, it's the exact function that the patch modifies.

Let me think for a moment... is there any other function to consider? Ah, yes, `bpf_prog_run_array` is called within `trace_call_bpf`. But, I'm leaning towards focusing on `trace_call_bpf` since it is the top-level interface. Let me quickly check if `trace_call_bpf` is static or inline. Okay, it's `unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx)` in `kernel/trace/bpf_trace.c`. It's not static. It's exported, or at least globally visible.

Okay, I think I'm happy to focus on `trace_call_bpf` as the primary fuzzing target. It seems like the best focus symbol.

{
  "Expression": "trace_call_bpf",
  "PathPrefix": "kernel/trace/bpf_trace.c"
}

{
  "Output": "kernel/trace/bpf_trace.c=96=static u64 bpf_uprobe_multi_entry_ip(struct bpf_run_ctx *ctx);\n--\nkernel/trace/bpf_trace.c-98-/**\nkernel/trace/bpf_trace.c:99: * trace_call_bpf - invoke BPF program\nkernel/trace/bpf_trace.c-100- * @call: tracepoint event\n--\nkernel/trace/bpf_trace.c-111- */\nkernel/trace/bpf_trace.c:112:unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx)\nkernel/trace/bpf_trace.c-113-{\n--\nkernel/trace/bpf_trace.c-139-\t * If bpf_prog_array_valid() fetched prog_array was\nkernel/trace/bpf_trace.c:140:\t * non-NULL, we go into trace_call_bpf() and do the actual\nkernel/trace/bpf_trace.c-141-\t * proper rcu_dereference() under RCU lock.\n--\nkernel/trace/bpf_trace.c-163-/**\nkernel/trace/bpf_trace.c:164: * trace_call_bpf_faultable - invoke BPF program in faultable context\nkernel/trace/bpf_trace.c-165- * @call: tracepoint event\n--\nkernel/trace/bpf_trace.c-167- *\nkernel/trace/bpf_trace.c:168: * Variant of trace_call_bpf() for faultable tracepoints (syscall\nkernel/trace/bpf_trace.c-169- * tracepoints). Supports sleepable BPF programs by using rcu_tasks_trace\n--\nkernel/trace/bpf_trace.c-178- */\nkernel/trace/bpf_trace.c:179:unsigned int trace_call_bpf_faultable(struct trace_event_call *call, void *ctx)\nkernel/trace/bpf_trace.c-180-{\n"
}

gemini-3.1-pro-preview

null

null

							input: 12493
							output: 23
							thoughts: 124
						

**Examining BPF Tracepoint Configuration**

Okay, `trace_call_bpf` seems like a solid starting point for investigation. Let's see what other configuration options are relevant to BPF. I need to make sure I'm considering all the necessary dependencies. I'll quickly check for `CONFIG_BPF_SYSCALL`, `CONFIG_BPF_EVENTS`, and `CONFIG_LOCKDEP` – those are the usual suspects.

Now, specifically regarding the `lock_release` tracepoint... where are its dependencies? Ah, it's in `include/trace/events/lock.h`, right. I should make sure that the `lock` tracepoints themselves are enabled via configuration. I'll need to dig into `kernel/trace/Kconfig` or possibly `lib/Kconfig.debug` to see if there's a specific option related to enabling lock tracepoints that I'm missing.

{
  "Expression": "lock_release",
  "PathPrefix": ""
}

{
  "Output": "\nFull output is too long, showing 500 out of 1334 lines.\nUse more precise expression if possible.\n\narch/arm/kernel/setup.c=596=void __init smp_setup_processor_id(void)\n--\narch/arm/kernel/setup.c-608-\t * using percpu variable early, for example, lockdep will\narch/arm/kernel/setup.c:609:\t * access percpu variable inside lock_release\narch/arm/kernel/setup.c-610-\t */\n--\narch/sparc/mm/fault_64.c=267=asmlinkage void __kprobes do_sparc64_fault(struct pt_regs *regs)\n--\narch/sparc/mm/fault_64.c-440-\tif (fault \u0026 VM_FAULT_COMPLETED)\narch/sparc/mm/fault_64.c:441:\t\tgoto lock_released;\narch/sparc/mm/fault_64.c-442-\n--\narch/sparc/mm/fault_64.c-464-\narch/sparc/mm/fault_64.c:465:lock_released:\narch/sparc/mm/fault_64.c-466-\tmm_rss = get_mm_rss(mm);\n--\narch/x86/kernel/cpu/mce/amd.c=1031=static const struct sysfs_ops threshold_ops = {\n--\narch/x86/kernel/cpu/mce/amd.c-1035-\narch/x86/kernel/cpu/mce/amd.c:1036:static void threshold_block_release(struct kobject *kobj);\narch/x86/kernel/cpu/mce/amd.c-1037-\narch/x86/kernel/cpu/mce/amd.c=1038=static const struct kobj_type threshold_ktype = {\n--\narch/x86/kernel/cpu/mce/amd.c-1040-\t.default_groups\t\t= default_groups,\narch/x86/kernel/cpu/mce/amd.c:1041:\t.release\t\t= threshold_block_release,\narch/x86/kernel/cpu/mce/amd.c-1042-};\n--\narch/x86/kernel/cpu/mce/amd.c=1154=static int threshold_create_bank(struct threshold_bank **bp, unsigned int cpu,\n--\narch/x86/kernel/cpu/mce/amd.c-1194-\narch/x86/kernel/cpu/mce/amd.c:1195:static void threshold_block_release(struct kobject *kobj)\narch/x86/kernel/cpu/mce/amd.c-1196-{\n--\ndrivers/acpi/dock.c=502=static ssize_t undock_store(struct device *dev, struct device_attribute *attr,\n--\ndrivers/acpi/dock.c-513-\tret = handle_eject_request(dock_station, ACPI_NOTIFY_EJECT_REQUEST);\ndrivers/acpi/dock.c:514:\tacpi_scan_lock_release();\ndrivers/acpi/dock.c-515-\treturn ret ? ret : count;\n--\ndrivers/acpi/scan.c=60=EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);\ndrivers/acpi/scan.c-61-\ndrivers/acpi/scan.c:62:void acpi_scan_lock_release(void)\ndrivers/acpi/scan.c-63-{\n--\ndrivers/acpi/scan.c-65-}\ndrivers/acpi/scan.c:66:EXPORT_SYMBOL_GPL(acpi_scan_lock_release);\ndrivers/acpi/scan.c-67-\n--\ndrivers/acpi/scan.c=2429=static void acpi_scan_clear_dep_fn(void *dev, async_cookie_t cookie)\n--\ndrivers/acpi/scan.c-2434-\tacpi_bus_attach(adev, (void *)true);\ndrivers/acpi/scan.c:2435:\tacpi_scan_lock_release();\ndrivers/acpi/scan.c-2436-\n--\ndrivers/acpi/scan.c=2932=static void acpi_table_events_fn(struct work_struct *work)\n--\ndrivers/acpi/scan.c-2935-\tacpi_bus_scan(ACPI_ROOT_OBJECT);\ndrivers/acpi/scan.c:2936:\tacpi_scan_lock_release();\ndrivers/acpi/scan.c-2937-\n--\ndrivers/acpi/sleep.c=539=static void acpi_pm_end(void)\n--\ndrivers/acpi/sleep.c-541-\tacpi_turn_off_unused_power_resources();\ndrivers/acpi/sleep.c:542:\tacpi_scan_lock_release();\ndrivers/acpi/sleep.c-543-\t/*\n--\ndrivers/acpi/sleep.c=843=void acpi_s2idle_end(void)\ndrivers/acpi/sleep.c-844-{\ndrivers/acpi/sleep.c:845:\tacpi_scan_lock_release();\ndrivers/acpi/sleep.c-846-}\n--\ndrivers/base/memory.c=90=EXPORT_SYMBOL(unregister_memory_notifier);\ndrivers/base/memory.c-91-\ndrivers/base/memory.c:92:static void memory_block_release(struct device *dev)\ndrivers/base/memory.c-93-{\n--\ndrivers/base/memory.c=682=static int __add_memory_block(struct memory_block *memory)\n--\ndrivers/base/memory.c-687-\tmemory-\u003edev.id = memory-\u003estart_section_nr / sections_per_block;\ndrivers/base/memory.c:688:\tmemory-\u003edev.release = memory_block_release;\ndrivers/base/memory.c-689-\tmemory-\u003edev.groups = memory_memblk_attr_groups;\n--\ndrivers/dma-buf/dma-fence.c=315=void dma_fence_end_signalling(bool cookie)\n--\ndrivers/dma-buf/dma-fence.c-319-\ndrivers/dma-buf/dma-fence.c:320:\tlock_release(\u0026dma_fence_lockdep_map, _RET_IP_);\ndrivers/dma-buf/dma-fence.c-321-}\n--\ndrivers/dma-buf/dma-fence.c=324=void __dma_fence_might_wait(void)\n--\ndrivers/dma-buf/dma-fence.c-329-\tif (tmp)\ndrivers/dma-buf/dma-fence.c:330:\t\tlock_release(\u0026dma_fence_lockdep_map, _THIS_IP_);\ndrivers/dma-buf/dma-fence.c-331-\tlock_map_acquire(\u0026dma_fence_lockdep_map);\n--\ndrivers/edac/edac_device_sysfs.c=421=static ssize_t block_ce_count_show(struct kobject *kobj,\n--\ndrivers/edac/edac_device_sysfs.c-429-/* DEVICE block kobject release() function */\ndrivers/edac/edac_device_sysfs.c:430:static void edac_device_ctrl_block_release(struct kobject *kobj)\ndrivers/edac/edac_device_sysfs.c-431-{\n--\ndrivers/edac/edac_device_sysfs.c=481=static struct kobj_type ktype_block_ctrl = {\ndrivers/edac/edac_device_sysfs.c:482:\t.release = edac_device_ctrl_block_release,\ndrivers/edac/edac_device_sysfs.c-483-\t.sysfs_ops = \u0026device_block_ops,\n--\ndrivers/edac/edac_device_sysfs.c=562=static void edac_device_delete_block(struct edac_device_ctl_info *edac_dev,\n--\ndrivers/edac/edac_device_sysfs.c-580-\t/* unregister this block's kobject, SEE:\ndrivers/edac/edac_device_sysfs.c:581:\t *\tedac_device_ctrl_block_release() callback operation\ndrivers/edac/edac_device_sysfs.c-582-\t */\n--\ndrivers/firmware/arm_scmi/transports/smc.c=115=smc_channel_lock_acquire(struct scmi_smc *scmi_info,\n--\ndrivers/firmware/arm_scmi/transports/smc.c-123-\ndrivers/firmware/arm_scmi/transports/smc.c:124:static inline void smc_channel_lock_release(struct scmi_smc *scmi_info)\ndrivers/firmware/arm_scmi/transports/smc.c-125-{\n--\ndrivers/firmware/arm_scmi/transports/smc.c=223=static int smc_send_message(struct scmi_chan_info *cinfo,\n--\ndrivers/firmware/arm_scmi/transports/smc.c-247-\tif (res.a0) {\ndrivers/firmware/arm_scmi/transports/smc.c:248:\t\tsmc_channel_lock_release(scmi_info);\ndrivers/firmware/arm_scmi/transports/smc.c-249-\t\treturn -EOPNOTSUPP;\n--\ndrivers/firmware/arm_scmi/transports/smc.c=264=static void smc_mark_txdone(struct scmi_chan_info *cinfo, int ret,\n--\ndrivers/firmware/arm_scmi/transports/smc.c-268-\ndrivers/firmware/arm_scmi/transports/smc.c:269:\tsmc_channel_lock_release(scmi_info);\ndrivers/firmware/arm_scmi/transports/smc.c-270-}\n--\ndrivers/gpio/gpio-mlxbf2.c=131=static int mlxbf2_gpio_lock_acquire(struct mlxbf2_gpio_context *gs)\n--\ndrivers/gpio/gpio-mlxbf2.c-156- */\ndrivers/gpio/gpio-mlxbf2.c:157:static void mlxbf2_gpio_lock_release(struct mlxbf2_gpio_context *gs)\ndrivers/gpio/gpio-mlxbf2.c-158-\t__releases(\u0026gs-\u003echip.lock)\n--\ndrivers/gpio/gpio-mlxbf2.c=184=static int mlxbf2_gpio_direction_input(struct gpio_chip *chip,\n--\ndrivers/gpio/gpio-mlxbf2.c-200-\ndrivers/gpio/gpio-mlxbf2.c:201:\tmlxbf2_gpio_lock_release(gs);\ndrivers/gpio/gpio-mlxbf2.c-202-\n--\ndrivers/gpio/gpio-mlxbf2.c=210=static int mlxbf2_gpio_direction_output(struct gpio_chip *chip,\n--\ndrivers/gpio/gpio-mlxbf2.c-228-\ndrivers/gpio/gpio-mlxbf2.c:229:\tmlxbf2_gpio_lock_release(gs);\ndrivers/gpio/gpio-mlxbf2.c-230-\n--\ndrivers/gpu/drm/drm_connector.c=1124=void drm_connector_list_iter_end(struct drm_connector_list_iter *iter)\n--\ndrivers/gpu/drm/drm_connector.c-1134-\t}\ndrivers/gpu/drm/drm_connector.c:1135:\tlock_release(\u0026connector_list_iter_dep_map, _RET_IP_);\ndrivers/gpu/drm/drm_connector.c-1136-}\n--\ndrivers/gpu/drm/ttm/tests/ttm_bo_test.c=139=static void ttm_bo_reserve_deadlock(struct kunit *test)\n--\ndrivers/gpu/drm/ttm/tests/ttm_bo_test.c-153-\t/* The deadlock will be caught by WW mutex, don't warn about it */\ndrivers/gpu/drm/ttm/tests/ttm_bo_test.c:154:\tlock_release(\u0026bo2-\u003ebase.resv-\u003elock.base.dep_map, 1);\ndrivers/gpu/drm/ttm/tests/ttm_bo_test.c-155-\n--\ndrivers/gpu/drm/xe/xe_pm.c=100=static void xe_pm_block_end_signalling(void)\ndrivers/gpu/drm/xe/xe_pm.c-101-{\ndrivers/gpu/drm/xe/xe_pm.c:102:\tlock_release(\u0026xe_pm_block_lockdep_map, _RET_IP_);\ndrivers/gpu/drm/xe/xe_pm.c-103-}\n--\ndrivers/hwspinlock/hwspinlock_core.c=815=static int devm_hwspin_lock_match(struct device *dev, void *res, void *data)\n--\ndrivers/hwspinlock/hwspinlock_core.c-824-\ndrivers/hwspinlock/hwspinlock_core.c:825:static void devm_hwspin_lock_release(struct device *dev, void *res)\ndrivers/hwspinlock/hwspinlock_core.c-826-{\n--\ndrivers/hwspinlock/hwspinlock_core.c=843=int devm_hwspin_lock_free(struct device *dev, struct hwspinlock *hwlock)\n--\ndrivers/hwspinlock/hwspinlock_core.c-846-\ndrivers/hwspinlock/hwspinlock_core.c:847:\tret = devres_release(dev, devm_hwspin_lock_release,\ndrivers/hwspinlock/hwspinlock_core.c-848-\t\t\t     devm_hwspin_lock_match, hwlock);\n--\ndrivers/hwspinlock/hwspinlock_core.c=870=struct hwspinlock *devm_hwspin_lock_request_specific(struct device *dev,\n--\ndrivers/hwspinlock/hwspinlock_core.c-874-\ndrivers/hwspinlock/hwspinlock_core.c:875:\tptr = devres_alloc(devm_hwspin_lock_release, sizeof(*ptr), GFP_KERNEL);\ndrivers/hwspinlock/hwspinlock_core.c-876-\tif (!ptr)\n--\ndrivers/iio/buffer/industrialio-buffer-dma.c-97-\ndrivers/iio/buffer/industrialio-buffer-dma.c:98:static void iio_buffer_block_release(struct kref *kref)\ndrivers/iio/buffer/industrialio-buffer-dma.c-99-{\n--\ndrivers/iio/buffer/industrialio-buffer-dma.c=122=static void iio_buffer_block_put(struct iio_dma_buffer_block *block)\ndrivers/iio/buffer/industrialio-buffer-dma.c-123-{\ndrivers/iio/buffer/industrialio-buffer-dma.c:124:\tkref_put(\u0026block-\u003ekref, iio_buffer_block_release);\ndrivers/iio/buffer/industrialio-buffer-dma.c-125-}\n--\ndrivers/iio/buffer/industrialio-buffer-dma.c=134=static void iio_dma_buffer_cleanup_worker(struct work_struct *work)\n--\ndrivers/iio/buffer/industrialio-buffer-dma.c-142-\tlist_for_each_entry_safe(block, _block, \u0026block_list, head)\ndrivers/iio/buffer/industrialio-buffer-dma.c:143:\t\tiio_buffer_block_release(\u0026block-\u003ekref);\ndrivers/iio/buffer/industrialio-buffer-dma.c-144-}\ndrivers/iio/buffer/industrialio-buffer-dma.c=145=static DECLARE_WORK(iio_dma_buffer_cleanup_work, iio_dma_buffer_cleanup_worker);\ndrivers/iio/buffer/industrialio-buffer-dma.c-146-\ndrivers/iio/buffer/industrialio-buffer-dma.c:147:static void iio_buffer_block_release_atomic(struct kref *kref)\ndrivers/iio/buffer/industrialio-buffer-dma.c-148-{\n--\ndrivers/iio/buffer/industrialio-buffer-dma.c=162=static void iio_buffer_block_put_atomic(struct iio_dma_buffer_block *block)\ndrivers/iio/buffer/industrialio-buffer-dma.c-163-{\ndrivers/iio/buffer/industrialio-buffer-dma.c:164:\tkref_put(\u0026block-\u003ekref, iio_buffer_block_release_atomic);\ndrivers/iio/buffer/industrialio-buffer-dma.c-165-}\n--\ndrivers/mtd/mtdblock.c=253=static int mtdblock_open(struct mtd_blktrans_dev *mbd)\n--\ndrivers/mtd/mtdblock.c-281-\ndrivers/mtd/mtdblock.c:282:static void mtdblock_release(struct mtd_blktrans_dev *mbd)\ndrivers/mtd/mtdblock.c-283-{\n--\ndrivers/mtd/mtdblock.c-285-\ndrivers/mtd/mtdblock.c:286:\tpr_debug(\"mtdblock_release\\n\");\ndrivers/mtd/mtdblock.c-287-\n--\ndrivers/mtd/mtdblock.c=342=static struct mtd_blktrans_ops mtdblock_tr = {\n--\ndrivers/mtd/mtdblock.c-348-\t.flush\t\t= mtdblock_flush,\ndrivers/mtd/mtdblock.c:349:\t.release\t= mtdblock_release,\ndrivers/mtd/mtdblock.c-350-\t.readsect\t= mtdblock_readsect,\n--\ndrivers/mtd/ubi/block.c=230=static int ubiblock_open(struct gendisk *disk, blk_mode_t mode)\n--\ndrivers/mtd/ubi/block.c-271-\ndrivers/mtd/ubi/block.c:272:static void ubiblock_release(struct gendisk *gd)\ndrivers/mtd/ubi/block.c-273-{\n--\ndrivers/mtd/ubi/block.c=295=static const struct block_device_operations ubiblock_ops = {\n--\ndrivers/mtd/ubi/block.c-297-\t.open = ubiblock_open,\ndrivers/mtd/ubi/block.c:298:\t.release = ubiblock_release,\ndrivers/mtd/ubi/block.c-299-\t.getgeo\t= ubiblock_getgeo,\n--\ndrivers/net/ethernet/marvell/prestera/prestera_counter.c=141=prestera_counter_block_get(struct prestera_counter *counter, u32 client)\n--\ndrivers/net/ethernet/marvell/prestera/prestera_counter.c-191-err_stats:\ndrivers/net/ethernet/marvell/prestera/prestera_counter.c:192:\tprestera_hw_counter_block_release(counter-\u003esw, block-\u003eid);\ndrivers/net/ethernet/marvell/prestera/prestera_counter.c-193-err_block:\n--\ndrivers/net/ethernet/marvell/prestera/prestera_counter.c=198=static void prestera_counter_block_put(struct prestera_counter *counter,\n--\ndrivers/net/ethernet/marvell/prestera/prestera_counter.c-217-\ndrivers/net/ethernet/marvell/prestera/prestera_counter.c:218:\tprestera_hw_counter_block_release(counter-\u003esw, block-\u003eid);\ndrivers/net/ethernet/marvell/prestera/prestera_counter.c-219-\tidr_destroy(\u0026block-\u003ecounter_idr);\n--\ndrivers/net/ethernet/marvell/prestera/prestera_flow.c=79=prestera_flow_block_create(struct prestera_switch *sw,\n--\ndrivers/net/ethernet/marvell/prestera/prestera_flow.c-100-\ndrivers/net/ethernet/marvell/prestera/prestera_flow.c:101:static void prestera_flow_block_release(void *cb_priv)\ndrivers/net/ethernet/marvell/prestera/prestera_flow.c-102-{\n--\ndrivers/net/ethernet/marvell/prestera/prestera_flow.c=173=prestera_flow_block_get(struct prestera_switch *sw,\n--\ndrivers/net/ethernet/marvell/prestera/prestera_flow.c-189-\t\t\t\t\t       sw, block,\ndrivers/net/ethernet/marvell/prestera/prestera_flow.c:190:\t\t\t\t\t       prestera_flow_block_release);\ndrivers/net/ethernet/marvell/prestera/prestera_flow.c-191-\t\tif (IS_ERR(block_cb)) {\n--\ndrivers/net/ethernet/marvell/prestera/prestera_hw.c=2340=int prestera_hw_counter_block_get(struct prestera_switch *sw,\n--\ndrivers/net/ethernet/marvell/prestera/prestera_hw.c-2361-\ndrivers/net/ethernet/marvell/prestera/prestera_hw.c:2362:int prestera_hw_counter_block_release(struct prestera_switch *sw,\ndrivers/net/ethernet/marvell/prestera/prestera_hw.c-2363-\t\t\t\t      u32 block_id)\n--\ndrivers/net/ethernet/marvell/prestera/prestera_hw.h=239=int prestera_hw_counter_block_get(struct prestera_switch *sw,\n--\ndrivers/net/ethernet/marvell/prestera/prestera_hw.h-241-\t\t\t\t  u32 *num_counters);\ndrivers/net/ethernet/marvell/prestera/prestera_hw.h:242:int prestera_hw_counter_block_release(struct prestera_switch *sw,\ndrivers/net/ethernet/marvell/prestera/prestera_hw.h-243-\t\t\t\t      u32 block_id);\n--\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_flow.c=174=static int mlxsw_sp_flow_block_cb(enum tc_setup_type type,\n--\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_flow.c-191-\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_flow.c:192:static void mlxsw_sp_tc_block_release(void *cb_priv)\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_flow.c-193-{\n--\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_flow.c=201=static int mlxsw_sp_setup_tc_block_bind(struct mlxsw_sp_port *mlxsw_sp_port,\n--\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_flow.c-218-\t\t\t\t\t       mlxsw_sp, flow_block,\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_flow.c:219:\t\t\t\t\t       mlxsw_sp_tc_block_release);\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_flow.c-220-\t\tif (IS_ERR(block_cb)) {\n--\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c=2113=mlxsw_sp_qevent_block_destroy(struct mlxsw_sp_qevent_block *qevent_block)\n--\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c-2119-\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c:2120:static void mlxsw_sp_qevent_block_release(void *cb_priv)\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c-2121-{\n--\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c=2169=mlxsw_sp_setup_tc_block_qevent_bind(struct mlxsw_sp_port *mlxsw_sp_port,\n--\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c-2188-\t\tblock_cb = flow_block_cb_alloc(mlxsw_sp_qevent_block_cb, mlxsw_sp, qevent_block,\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c:2189:\t\t\t\t\t       mlxsw_sp_qevent_block_release);\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c-2190-\t\tif (IS_ERR(block_cb)) {\n--\ndrivers/net/ethernet/microchip/lan743x_ethtool.c=160=int lan743x_hs_syslock_acquire(struct lan743x_adapter *adapter,\n--\ndrivers/net/ethernet/microchip/lan743x_ethtool.c-196-\ndrivers/net/ethernet/microchip/lan743x_ethtool.c:197:void lan743x_hs_syslock_release(struct lan743x_adapter *adapter)\ndrivers/net/ethernet/microchip/lan743x_ethtool.c-198-{\n--\ndrivers/net/ethernet/microchip/lan743x_ethtool.c=271=static int lan743x_hs_otp_read(struct lan743x_adapter *adapter, u32 offset,\n--\ndrivers/net/ethernet/microchip/lan743x_ethtool.c-289-\ndrivers/net/ethernet/microchip/lan743x_ethtool.c:290:\tlan743x_hs_syslock_release(adapter);\ndrivers/net/ethernet/microchip/lan743x_ethtool.c-291-\n--\ndrivers/net/ethernet/microchip/lan743x_ethtool.c-306-\ndrivers/net/ethernet/microchip/lan743x_ethtool.c:307:\t\tlan743x_hs_syslock_release(adapter);\ndrivers/net/ethernet/microchip/lan743x_ethtool.c-308-\t}\n--\ndrivers/net/ethernet/microchip/lan743x_ethtool.c-316-\tlan743x_hs_otp_power_down(adapter);\ndrivers/net/ethernet/microchip/lan743x_ethtool.c:317:\tlan743x_hs_syslock_release(adapter);\ndrivers/net/ethernet/microchip/lan743x_ethtool.c-318-\n--\ndrivers/net/ethernet/microchip/lan743x_ethtool.c=322=static int lan743x_hs_otp_write(struct lan743x_adapter *adapter, u32 offset,\n--\ndrivers/net/ethernet/microchip/lan743x_ethtool.c-343-\ndrivers/net/ethernet/microchip/lan743x_ethtool.c:344:\tlan743x_hs_syslock_release(adapter);\ndrivers/net/ethernet/microchip/lan743x_ethtool.c-345-\n--\ndrivers/net/ethernet/microchip/lan743x_ethtool.c-362-\ndrivers/net/ethernet/microchip/lan743x_ethtool.c:363:\t\tlan743x_hs_syslock_release(adapter);\ndrivers/net/ethernet/microchip/lan743x_ethtool.c-364-\t}\n--\ndrivers/net/ethernet/microchip/lan743x_ethtool.c-371-\tlan743x_hs_otp_power_down(adapter);\ndrivers/net/ethernet/microchip/lan743x_ethtool.c:372:\tlan743x_hs_syslock_release(adapter);\ndrivers/net/ethernet/microchip/lan743x_ethtool.c-373-\n--\ndrivers/net/ethernet/microchip/lan743x_ethtool.c=501=static int lan743x_hs_eeprom_read(struct lan743x_adapter *adapter,\n--\ndrivers/net/ethernet/microchip/lan743x_ethtool.c-515-\tretval = lan743x_hs_eeprom_cmd_cmplt_chk(adapter);\ndrivers/net/ethernet/microchip/lan743x_ethtool.c:516:\tlan743x_hs_syslock_release(adapter);\ndrivers/net/ethernet/microchip/lan743x_ethtool.c-517-\tif (retval \u003c 0)\n--\ndrivers/net/ethernet/microchip/lan743x_ethtool.c-530-\t\tif (retval \u003c 0) {\ndrivers/net/ethernet/microchip/lan743x_ethtool.c:531:\t\t\tlan743x_hs_syslock_release(adapter);\ndrivers/net/ethernet/microchip/lan743x_ethtool.c-532-\t\t\treturn retval;\n--\ndrivers/net/ethernet/microchip/lan743x_ethtool.c-536-\ndrivers/net/ethernet/microchip/lan743x_ethtool.c:537:\t\tlan743x_hs_syslock_release(adapter);\ndrivers/net/ethernet/microchip/lan743x_ethtool.c-538-\n--\ndrivers/net/ethernet/microchip/lan743x_ethtool.c=546=static int lan743x_hs_eeprom_write(struct lan743x_adapter *adapter,\n--\ndrivers/net/ethernet/microchip/lan743x_ethtool.c-560-\tretval = lan743x_hs_eeprom_cmd_cmplt_chk(adapter);\ndrivers/net/ethernet/microchip/lan743x_ethtool.c:561:\tlan743x_hs_syslock_release(adapter);\ndrivers/net/ethernet/microchip/lan743x_ethtool.c-562-\tif (retval \u003c 0)\n--\ndrivers/net/ethernet/microchip/lan743x_ethtool.c-580-\t\tretval = lan743x_hs_eeprom_cmd_cmplt_chk(adapter);\ndrivers/net/ethernet/microchip/lan743x_ethtool.c:581:\t\tlan743x_hs_syslock_release(adapter);\ndrivers/net/ethernet/microchip/lan743x_ethtool.c-582-\t\tif (retval \u003c 0)\n--\ndrivers/net/ethernet/microchip/lan743x_main.c=37=static void pci11x1x_strap_get_status(struct lan743x_adapter *adapter)\n--\ndrivers/net/ethernet/microchip/lan743x_main.c-53-\tcfg_load = lan743x_csr_read(adapter, ETH_SYS_CONFIG_LOAD_STARTED_REG);\ndrivers/net/ethernet/microchip/lan743x_main.c:54:\tlan743x_hs_syslock_release(adapter);\ndrivers/net/ethernet/microchip/lan743x_main.c-55-\thw_cfg = lan743x_csr_read(adapter, HW_CFG);\n--\ndrivers/net/ethernet/microchip/lan743x_main.h=1208=int lan743x_hs_syslock_acquire(struct lan743x_adapter *adapter, u16 timeout);\ndrivers/net/ethernet/microchip/lan743x_main.h:1209:void lan743x_hs_syslock_release(struct lan743x_adapter *adapter);\ndrivers/net/ethernet/microchip/lan743x_main.h-1210-void lan743x_mac_flow_ctrl_set_enables(struct lan743x_adapter *adapter,\n--\ndrivers/pci/hotplug/acpiphp_glue.c=1027=int acpiphp_disable_slot(struct acpiphp_slot *slot)\n--\ndrivers/pci/hotplug/acpiphp_glue.c-1038-\tpci_unlock_rescan_remove();\ndrivers/pci/hotplug/acpiphp_glue.c:1039:\tacpi_scan_lock_release();\ndrivers/pci/hotplug/acpiphp_glue.c-1040-\treturn ret;\n--\ndrivers/ptp/ptp_clock.c=189=static struct posix_clock_operations ptp_clock_ops = {\n--\ndrivers/ptp/ptp_clock.c-201-\ndrivers/ptp/ptp_clock.c:202:static void ptp_clock_release(struct device *dev)\ndrivers/ptp/ptp_clock.c-203-{\n--\ndrivers/ptp/ptp_clock.c=316=struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,\n--\ndrivers/ptp/ptp_clock.c-434-\tptp-\u003edev.groups = ptp-\u003epin_attr_groups;\ndrivers/ptp/ptp_clock.c:435:\tptp-\u003edev.release = ptp_clock_release;\ndrivers/ptp/ptp_clock.c-436-\tdev_set_drvdata(\u0026ptp-\u003edev, ptp);\n--\ndrivers/ptp/ptp_clock.c=497=int ptp_clock_unregister(struct ptp_clock *ptp)\n--\ndrivers/ptp/ptp_clock.c-526-\ndrivers/ptp/ptp_clock.c:527:\t/* The final put, normally here, will invoke ptp_clock_release(). */\ndrivers/ptp/ptp_clock.c-528-\tput_device(\u0026ptp-\u003edev);\n--\ndrivers/scsi/sr.c=495=static int sr_block_open(struct gendisk *disk, blk_mode_t mode)\n--\ndrivers/scsi/sr.c-520-\ndrivers/scsi/sr.c:521:static void sr_block_release(struct gendisk *disk)\ndrivers/scsi/sr.c-522-{\n--\ndrivers/scsi/sr.c=589=static const struct block_device_operations sr_bdops =\n--\ndrivers/scsi/sr.c-592-\t.open\t\t= sr_block_open,\ndrivers/scsi/sr.c:593:\t.release\t= sr_block_release,\ndrivers/scsi/sr.c-594-\t.ioctl\t\t= sr_block_ioctl,\n--\nfs/afs/flock.c=281=void afs_lock_work(struct work_struct *work)\n--\nfs/afs/flock.c-303-\t\tif (ret \u003c 0 \u0026\u0026 vnode-\u003elock_state != AFS_VNODE_LOCK_DELETED) {\nfs/afs/flock.c:304:\t\t\ttrace_afs_flock_ev(vnode, NULL, afs_flock_release_fail,\nfs/afs/flock.c-305-\t\t\t\t\t   ret);\n--\nfs/hugetlbfs/inode.c=379=static void hugetlb_unmap_file_folio(struct hstate *h,\n--\nfs/hugetlbfs/inode.c-440-\t\t\tup_write(\u0026vma_lock-\u003erw_sema);\nfs/hugetlbfs/inode.c:441:\t\t\tkref_put(\u0026vma_lock-\u003erefs, hugetlb_vma_lock_release);\nfs/hugetlbfs/inode.c-442-\t\t\tgoto retry;\n--\nfs/hugetlbfs/inode.c-454-\nfs/hugetlbfs/inode.c:455:\t\tkref_put(\u0026vma_lock-\u003erefs, hugetlb_vma_lock_release);\nfs/hugetlbfs/inode.c-456-\t\thugetlb_vma_unlock_write(vma);\n--\nfs/nfs/nfs4proc.c=7343=static void nfs4_lock_done(struct rpc_task *task, void *calldata)\n--\nfs/nfs/nfs4proc.c-7390-\nfs/nfs/nfs4proc.c:7391:static void nfs4_lock_release(void *calldata)\nfs/nfs/nfs4proc.c-7392-{\n--\nfs/nfs/nfs4proc.c=7410=static const struct rpc_call_ops nfs4_lock_ops = {\n--\nfs/nfs/nfs4proc.c-7412-\t.rpc_call_done = nfs4_lock_done,\nfs/nfs/nfs4proc.c:7413:\t.rpc_release = nfs4_lock_release,\nfs/nfs/nfs4proc.c-7414-};\n--\nfs/nfsd/nfs4proc.c=3594=static const struct nfsd4_operation nfsd4_ops[] = {\n--\nfs/nfsd/nfs4proc.c-3646-\t\t.op_func = nfsd4_lock,\nfs/nfsd/nfs4proc.c:3647:\t\t.op_release = nfsd4_lock_release,\nfs/nfsd/nfs4proc.c-3648-\t\t.op_flags = OP_MODIFIES_SOMETHING |\n--\nfs/nfsd/nfs4state.c=385=static void\nfs/nfsd/nfs4state.c:386:nfsd4_cb_notify_lock_release(struct nfsd4_callback *cb)\nfs/nfsd/nfs4state.c-387-{\n--\nfs/nfsd/nfs4state.c=394=static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops = {\n--\nfs/nfsd/nfs4state.c-396-\t.done\t\t= nfsd4_cb_notify_lock_done,\nfs/nfsd/nfs4state.c:397:\t.release\t= nfsd4_cb_notify_lock_release,\nfs/nfsd/nfs4state.c-398-\t.opcode\t\t= OP_CB_NOTIFY_LOCK,\n--\nfs/nfsd/nfs4state.c=8428=nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,\n--\nfs/nfsd/nfs4state.c-8652-\nfs/nfsd/nfs4state.c:8653:void nfsd4_lock_release(union nfsd4_op_u *u)\nfs/nfsd/nfs4state.c-8654-{\n--\nfs/nfsd/xdr4.h=1008=extern __be32 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *,\nfs/nfsd/xdr4.h-1009-\t\tunion nfsd4_op_u *u);\nfs/nfsd/xdr4.h:1010:extern void nfsd4_lock_release(union nfsd4_op_u *u);\nfs/nfsd/xdr4.h-1011-extern __be32 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *,\n--\nfs/ocfs2/dlm/dlmlock.c=46=static void dlm_init_lock(struct dlm_lock *newlock, int type,\nfs/ocfs2/dlm/dlmlock.c-47-\t\t\t  u8 node, u64 cookie);\nfs/ocfs2/dlm/dlmlock.c:48:static void dlm_lock_release(struct kref *kref);\nfs/ocfs2/dlm/dlmlock.c-49-static void dlm_lock_detach_lockres(struct dlm_lock *lock);\n--\nfs/ocfs2/dlm/dlmlock.c=329=void dlm_lock_put(struct dlm_lock *lock)\nfs/ocfs2/dlm/dlmlock.c-330-{\nfs/ocfs2/dlm/dlmlock.c:331:\tkref_put(\u0026lock-\u003elock_refs, dlm_lock_release);\nfs/ocfs2/dlm/dlmlock.c-332-}\nfs/ocfs2/dlm/dlmlock.c-333-\nfs/ocfs2/dlm/dlmlock.c:334:static void dlm_lock_release(struct kref *kref)\nfs/ocfs2/dlm/dlmlock.c-335-{\n--\nfs/resctrl/internal.h=480=int rdt_pseudo_lock_init(void);\nfs/resctrl/internal.h-481-\nfs/resctrl/internal.h:482:void rdt_pseudo_lock_release(void);\nfs/resctrl/internal.h-483-\n--\nfs/resctrl/internal.h=509=static inline int rdt_pseudo_lock_init(void) { return 0; }\nfs/resctrl/internal.h:510:static inline void rdt_pseudo_lock_release(void) { }\nfs/resctrl/internal.h-511-static inline int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp)\n--\nfs/resctrl/pseudo_lock.c=1075=int rdt_pseudo_lock_init(void)\n--\nfs/resctrl/pseudo_lock.c-1093-\nfs/resctrl/pseudo_lock.c:1094:void rdt_pseudo_lock_release(void)\nfs/resctrl/pseudo_lock.c-1095-{\n--\nfs/resctrl/rdtgroup.c=2803=static int rdt_get_tree(struct fs_context *fc)\n--\nfs/resctrl/rdtgroup.c-2903-out_psl:\nfs/resctrl/rdtgroup.c:2904:\trdt_pseudo_lock_release();\nfs/resctrl/rdtgroup.c-2905-out_mondata:\n--\nfs/resctrl/rdtgroup.c=3181=static void resctrl_fs_teardown(void)\n--\nfs/resctrl/rdtgroup.c-3191-\tmon_put_kn_priv();\nfs/resctrl/rdtgroup.c:3192:\trdt_pseudo_lock_release();\nfs/resctrl/rdtgroup.c-3193-\trdtgroup_default.mode = RDT_MODE_SHAREABLE;\n--\ninclude/acpi/acpi_bus.h=674=void acpi_scan_lock_acquire(void);\ninclude/acpi/acpi_bus.h:675:void acpi_scan_lock_release(void);\ninclude/acpi/acpi_bus.h-676-void acpi_lock_hp_context(void);\n--\ninclude/linux/hugetlb.h=269=void hugetlb_vma_assert_locked(struct vm_area_struct *vma);\ninclude/linux/hugetlb.h:270:void hugetlb_vma_lock_release(struct kref *kref);\ninclude/linux/hugetlb.h-271-long hugetlb_change_protection(struct vm_area_struct *vma,\n--\n\n"
}

gemini-3.1-pro-preview

null

null

							input: 24291
							output: 24
							thoughts: 17
						

Okay, let's dive into this. Here's how I'd approach that kernel task:

**Tracing Lock Behavior: A Kernel Dive**

Alright, time to get my hands dirty. I'm thinking, "Where would the lock tracepoints likely be defined?" My gut tells me that the core configuration for tracepoints related to locking is probably going to be in the `kernel/trace/` directory. Given that, let's zero in on `Kconfig` within that directory. It's the standard for kernel configuration files, and it's practically guaranteed to list available features, and often the configuration options, related to lock tracing. This is where the hunt begins. I'll need to figure out what's enabled and what's not in terms of tracing.

{
  "Expression": "config LOCK_STAT",
  "PathPrefix": ""
}

{
  "Output": "lib/Kconfig.debug=1496=config PROVE_RAW_LOCK_NESTING\n--\nlib/Kconfig.debug-1504-\nlib/Kconfig.debug:1505:config LOCK_STAT\nlib/Kconfig.debug-1506-\tbool \"Lock usage statistics\"\n"
}

gemini-3.1-pro-preview

null

null

							input: 24583
							output: 29
							thoughts: 714
						

**My Analysis of the Lockdep Disabling Patch for BPF Tracepoints**

Okay, let's break this down. First, I see that the `lock_release` tracepoint is defined within `include/trace/events/lock.h` and is conditionally compiled under `#ifdef CONFIG_LOCKDEP`. So, having `CONFIG_LOCKDEP` enabled is essential for the tracepoint definition itself. Beyond that, I need to check the dependencies. I see three key configurations involved: `CONFIG_BPF_SYSCALL`, `CONFIG_BPF_EVENTS`, and, of course, `CONFIG_LOCKDEP`.

Now, the core of the change lies within `trace_call_bpf` in `kernel/trace/bpf_trace.c`. I need to confirm that this is the *only* function impacted by this patch. Yes, it's just `trace_call_bpf`. The patch also touches `include/linux/trace_events.h` and `include/trace/events/lock.h`, adding the `TRACE_EVENT_FL_BPF_NO_LOCKDEP` flag. I have to check for any lockdep usage in BPF.

Right, the patch adds a conditional `lockdep_off()` and `lockdep_on()` around the `bpf_prog_run_array` call within `trace_call_bpf`. This is a functional change. It explicitly disables lockdep *during* the execution of BPF programs attached to the `lock_release` tracepoint. This is *definitely* an area that needs some serious fuzzing! There are definite functional implications to this.

I'm focusing my attention on the following configurations: `CONFIG_BPF_SYSCALL`, `CONFIG_BPF_EVENTS`, and `CONFIG_LOCKDEP`. The key symbol here is `trace_call_bpf`. I need to make sure this is the only function impacted. I checked `trace_call_bpf_faultable`; not modified. I know that `bpf_prog_run_array` is an inline or macro, so it's not directly modified either. So, it's only `trace_call_bpf`.

I need to make sure `trace_call_bpf` is reachable, and it is. When a BPF program is attached to a tracepoint, `trace_call_bpf` is called, and for `lock_release` it will be called with `no_lockdep = true`.

Just double-checking my configuration names; `CONFIG_LOCKDEP`, `CONFIG_BPF_EVENTS`, and `CONFIG_BPF_SYSCALL`.

Now, I have to consider the usual dependencies of `LOCKDEP`. It usually relies on things like `PROVE_LOCKING`, `LOCK_STAT`, or `DEBUG_LOCK_ALLOC`. I should check `lib/Kconfig.debug` to verify these dependencies.

{
  "Expression": "config LOCKDEP",
  "PathPrefix": "lib/Kconfig.debug"
}

{
  "Output": "lib/Kconfig.debug=1576=config DEBUG_LOCK_ALLOC\n--\nlib/Kconfig.debug-1590-\nlib/Kconfig.debug:1591:config LOCKDEP\nlib/Kconfig.debug-1592-\tbool\n--\nlib/Kconfig.debug-1597-\nlib/Kconfig.debug:1598:config LOCKDEP_SMALL\nlib/Kconfig.debug-1599-\tbool\nlib/Kconfig.debug-1600-\nlib/Kconfig.debug:1601:config LOCKDEP_BITS\nlib/Kconfig.debug-1602-\tint \"Size for MAX_LOCKDEP_ENTRIES (as Nth power of 2)\"\n--\nlib/Kconfig.debug-1608-\nlib/Kconfig.debug:1609:config LOCKDEP_CHAINS_BITS\nlib/Kconfig.debug-1610-\tint \"Size for MAX_LOCKDEP_CHAINS (as Nth power of 2)\"\n--\nlib/Kconfig.debug-1616-\nlib/Kconfig.debug:1617:config LOCKDEP_STACK_TRACE_BITS\nlib/Kconfig.debug-1618-\tint \"Size for MAX_STACK_TRACE_ENTRIES (as Nth power of 2)\"\n--\nlib/Kconfig.debug-1631-\nlib/Kconfig.debug:1632:config LOCKDEP_STACK_TRACE_HASH_BITS\nlib/Kconfig.debug-1633-\tint \"Size for STACK_TRACE_HASH_SIZE (as Nth power of 2)\"\n--\nlib/Kconfig.debug-1640-\nlib/Kconfig.debug:1641:config LOCKDEP_CIRCULAR_QUEUE_BITS\nlib/Kconfig.debug-1642-\tint \"Size for elements in circular_queue struct (as Nth power of 2)\"\n"
}

gemini-3.1-pro-preview

null

null

							input: 26427
							output: 32
							thoughts: 54
						

**My Lockdep Musings**

Okay, so I'm thinking about `LOCKDEP` here. It seems like it's a bit of a hidden gem, a boolean that gets activated through a few other options. Specifically, it looks like `PROVE_LOCKING`, `LOCK_STAT`, and `DEBUG_LOCK_ALLOC` all have a hand in enabling it. That makes sense, in the grand scheme of things, given what I know about the kernel's debugging infrastructure.

Therefore, to *guarantee* that `LOCKDEP` is actually active, it's pretty clear to me that I should just go ahead and enable `PROVE_LOCKING`. Given my work, it's the most straight forward path. Seems like that would be the most reliable way to ensure that this lock dependency detection mechanism is truly running and working as intended. Simpler is better, after all.

{
  "Expression": "config PROVE_LOCKING",
  "PathPrefix": "lib/Kconfig.debug"
}

{
  "Output": "lib/Kconfig.debug=1444=config LOCK_DEBUGGING_SUPPORT\n--\nlib/Kconfig.debug-1448-\nlib/Kconfig.debug:1449:config PROVE_LOCKING\nlib/Kconfig.debug-1450-\tbool \"Lock debugging: prove locking correctness\"\n"
}

gemini-3.1-pro-preview

null

null

							input: 26790
							output: 34
							thoughts: 30
						

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

**Enabling Prove Locking and Re-Examining BPF_EVENTS Dependencies**

Right, `PROVE_LOCKING`… that's a solid choice to enable. It's time to bring additional debug data, particularly for kernel locking. The potential for catching subtle concurrency bugs and data races justifies it.

Now, before I commit that change, let's just do a quick sanity check, specifically regarding the `BPF_EVENTS` dependencies. I need to make absolutely sure everything is still in sync. I know the general requirements, but it's worth a double-check to avoid any unforeseen integration issues or build failures. Gotta keep an eye on those dependencies, particularly after any upstream changes. Better safe than sorry.

{
  "File": "kernel/trace/Kconfig",
  "FirstLine": 850,
  "LineCount": 20
}

{
  "Contents": " 850:\t\t  convert the type of an event field. For example, turn an\n 851:\t\t  address into a string.\n 852:\t\n 853:\tconfig BPF_EVENTS\n 854:\t\tdepends on BPF_SYSCALL\n 855:\t\tdepends on (KPROBE_EVENTS || UPROBE_EVENTS) \u0026\u0026 PERF_EVENTS\n 856:\t\tbool\n 857:\t\tdefault y\n 858:\t\thelp\n 859:\t\t  This allows the user to attach BPF programs to kprobe, uprobe, and\n 860:\t\t  tracepoint events.\n 861:\t\n 862:\tconfig DYNAMIC_EVENTS\n 863:\t\tdef_bool n\n 864:\t\n 865:\tconfig PROBE_EVENTS\n 866:\t\tdef_bool n\n 867:\t\n 868:\tconfig BPF_KPROBE_OVERRIDE\n 869:\t\tbool \"Enable BPF programs to override a kprobed function\"\n"
}

gemini-3.1-pro-preview

null

null

							input: 27299
							output: 32
							thoughts: 134
						

**Kernel Configuration: BPF Event Dependencies**

Okay, let's break this down. My initial thought was that `BPF_EVENTS` is contingent on a few other configurations: specifically, `BPF_SYSCALL`, and either `KPROBE_EVENTS` or `UPROBE_EVENTS` *in conjunction with* `PERF_EVENTS`. That seemed straightforward; I figured we'd have to explicitly enable `BPF_SYSCALL`, `KPROBE_EVENTS`, and `PERF_EVENTS` to get `BPF_EVENTS` to work.

But wait, hold on. I need to be more precise in my thinking. The default value for `BPF_EVENTS` is `y` *if* its dependencies are met. So, instead of explicitly enabling *everything*, I just need to ensure the dependencies are met. In this case, that means I should explicitly specify `BPF_SYSCALL`, `KPROBE_EVENTS`, `PERF_EVENTS`, and also `PROVE_LOCKING` for good measure.

Now, let me just confirm that `KPROBE_EVENTS` and `PERF_EVENTS` are truly set correctly. Always good to double-check.

{
  "Expression": "config KPROBE_EVENTS",
  "PathPrefix": "kernel/trace/Kconfig"
}

{
  "Output": "kernel/trace/Kconfig=770=config PROBE_EVENTS_BTF_ARGS\n--\nkernel/trace/Kconfig-781-\nkernel/trace/Kconfig:782:config KPROBE_EVENTS\nkernel/trace/Kconfig-783-\tdepends on KPROBES\n--\nkernel/trace/Kconfig-800-\nkernel/trace/Kconfig:801:config KPROBE_EVENTS_ON_NOTRACE\nkernel/trace/Kconfig-802-\tbool \"Do NOT protect notrace function from kprobe events\"\n"
}

gemini-3.1-pro-preview

null

null

							input: 27872
							output: 28
							thoughts: 14
						

Here's my understanding, summarized in the first person:

**My Understanding of KPROBE_EVENTS Dependency**

Okay, so I'm looking at `KPROBE_EVENTS`. It's pretty clear that it fundamentally depends on `KPROBES`. Without the underlying functionality of `KPROBES`, `KPROBE_EVENTS` just wouldn't be able to do what it's supposed to do. Think of `KPROBES` as the plumbing and `KPROBE_EVENTS` as the faucet; you can't have a working faucet without the plumbing in place. It seems simple, almost trivial, but it's important to state it explicitly. `KPROBES` provides the mechanism for actually inserting probes, and `KPROBE_EVENTS` builds on *that* foundation to do more advanced event generation and handling. So, yeah, it's a foundational dependency.

{
  "Expression": "config KPROBES",
  "PathPrefix": "arch/Kconfig"
}

{
  "Output": "arch/Kconfig=112=config GENERIC_ENTRY\n--\narch/Kconfig-116-\narch/Kconfig:117:config KPROBES\narch/Kconfig-118-\tbool \"Kprobes\"\n--\narch/Kconfig=168=config OPTPROBES\n--\narch/Kconfig-172-\narch/Kconfig:173:config KPROBES_ON_FTRACE\narch/Kconfig-174-\tdef_bool y\n"
}

gemini-3.1-pro-preview

null

null

							input: 28235
							output: 32
							thoughts: 20
						

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

**Kernel Probes: Navigating the Landscape**

Okay, so I'm diving into this and immediately the need for `KPROBES` pops into my head. It's the go-to for in-kernel instrumentation, and it's where I'll probably begin my investigation. But then, the question of specific events surfaces. I'm wondering if I should also be considering `UPROBE_EVENTS` in the mix. They're related, but handle user-space probes. I need to be sure I'm using the best tools for the job, depending on what I'm looking to achieve - kernel space or userspace or both. Need to factor that in. Gotta consider that to build a solution that's robust and efficient, I need to make the right choice between the two at the outset. I am pondering what the best way to leverage both might be.

{
  "Expression": "config UPROBE_EVENTS",
  "PathPrefix": "kernel/trace/Kconfig"
}

{
  "Output": "kernel/trace/Kconfig=801=config KPROBE_EVENTS_ON_NOTRACE\n--\nkernel/trace/Kconfig-820-\nkernel/trace/Kconfig:821:config UPROBE_EVENTS\nkernel/trace/Kconfig-822-\tbool \"Enable uprobes-based dynamic events\"\n"
}

gemini-3.1-pro-preview

null

null

							input: 28582
							output: 28
							thoughts: 14
						

Here's a summary of my thoughts, as though I'm the one having them:

**Dependency Considerations for UPROBE_EVENTS**

Okay, so I'm thinking about `UPROBE_EVENTS` and the architecture. It's pretty straightforward, really. It's clear that `UPROBE_EVENTS` *absolutely* depends on `UPROBES`. The core functionality of `UPROBE_EVENTS` – which is obviously event creation and handling related to user-space probes – is fundamentally built upon the underlying capabilities provided by `UPROBES`. I mean, how else would you capture and make sense of events related to probes if you didn't have the probes themselves in place first? It's a foundational dependency. I need to make sure this is explicit in any design docs or discussions.

{
  "Expression": "config UPROBES",
  "PathPrefix": "arch/Kconfig"
}

{
  "Output": "arch/Kconfig=173=config KPROBES_ON_FTRACE\n--\narch/Kconfig-181-\narch/Kconfig:182:config UPROBES\narch/Kconfig-183-\tdef_bool n\n"
}

gemini-3.1-pro-preview

null

null

							input: 28868
							output: 29
							thoughts: 34
						

Okay, here's my interpretation of those thoughts, framed as my own, given my expertise:

**Strategic Approach to Instrumentation**

Alright, I'm thinking we should streamline this process. Let's just lean heavily on `KPROBE_EVENTS` and plain old `KPROBES` for this initial implementation. I know they're powerful and well-understood, so starting with them makes the most sense.

Now, I also want to make sure we consider the long term. I should quickly verify if `PERF_EVENTS` is enabled via configuration. I'm guessing it might be, and if it is, we should give it full consideration at least. It's often the gold standard. We may want to expand to use it at some point. But for now, let's keep it simple and see if we can get the baseline implemented effectively.

{
  "Expression": "config PERF_EVENTS",
  "PathPrefix": "init/Kconfig"
}

{
  "Output": "init/Kconfig=2141=menu \"Kernel Performance Events And Counters\"\ninit/Kconfig-2142-\ninit/Kconfig:2143:config PERF_EVENTS\ninit/Kconfig-2144-\tbool \"Kernel performance events and counters\"\n"
}

gemini-3.1-pro-preview

null

null

							input: 29191
							output: 33
							thoughts: 248
						

**My Kernel Configuration Musings**

Okay, yes, definitely `PERF_EVENTS`. That's the starting point. Right, so to enable the necessary tracing infrastructure, I need to make sure I've got these configurations enabled: `BPF_SYSCALL`, `KPROBES`, `KPROBE_EVENTS`, `PERF_EVENTS` – obviously – and `PROVE_LOCKING`.

Now, before I move on, let's just quickly confirm whether I *can* actually enable `BPF_EVENTS` directly. Hmm, it's a `bool` config, and it defaults to "y". So, it should be automatically enabled if its dependencies are satisfied. But, I can explicitly set it too, which seems like a good practice.

Right, let's delve into the tracing implementation. I need to understand how the BPF programs get hooked into the kernel. Let's look at `trace_call_bpf` in `kernel/trace/bpf_trace.c`. Aha, it's called from `__bpf_trace_run`. And that function is generated using those `DECLARE_EVENT_CLASS` macros or something similar.

Okay, so when a BPF program is attached to a tracepoint, the kernel uses something like `perf_trace_##call`, which is what then calls `trace_call_bpf`. Wait a second… isn't `trace_call_bpf` called from `perf_trace_##call`? Yes, right, that's in `include/trace/perf.h`. Okay, better go and check that header file.

no matches

{
  "Expression": "trace_call_bpf",
  "PathPrefix": "include/trace/perf.h"
}

{
  "error": "no matches"
}

gemini-3.1-pro-preview

null

null

							input: 29832
							output: 30
							thoughts: 13
						

Okay, here's my summary, tailored as if I'm an expert in the field thinking through this:

**Locating the Callers of `trace_call_bpf`**

Right, so I need to figure out where `trace_call_bpf` is being invoked. It's a critical function, so understanding its call graph is paramount. I'm immediately thinking, is there a simple grep I can run to find the direct callers, or is it more complex than that? Given the nature of BPF, I suspect it might be called from multiple places, perhaps even dynamically. I'll need to consider how the BPF subsystem interacts with other parts of the kernel. Maybe there's a specific tracing mechanism that uses this, and I can narrow down the search that way. I'll need to consider both static calls and indirect calls through function pointers or jump tables. This requires a targeted investigation; a broad search might be too noisy. Thinking also about any module dependencies might also be useful to quickly reduce the search space. Time to dive into the code and see what I can uncover.

no matches

{
  "Expression": "trace_call_bpf",
  "PathPrefix": "include/trace/"
}

{
  "error": "no matches"
}

gemini-3.1-pro-preview

null

null

							input: 30120
							output: 30
							thoughts: 17
						

Okay, here's my summary, presented as a stream of thought:

**Tracing the Caller of `trace_call_bpf`**

Alright, time to get to the bottom of this. I need to understand the execution flow around `trace_call_bpf`. First, my instinct is to understand its calling context. So, let's start by doing a quick search for all the places where `trace_call_bpf` is actually invoked. I need to see the different scenarios, identify the parent functions or code blocks. That'll give me a good handle on its purpose and how it fits into the broader system. I'm expecting some interesting findings here, given the nature of BPF and tracing. Let's see what the code reveals!

{
  "Expression": "trace_call_bpf",
  "PathPrefix": "include/linux/"
}

{
  "Output": "include/linux/trace_events.h=759=trace_trigger_soft_disabled(struct trace_event_file *file)\n--\ninclude/linux/trace_events.h-774-#ifdef CONFIG_BPF_EVENTS\ninclude/linux/trace_events.h:775:unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx);\ninclude/linux/trace_events.h:776:unsigned int trace_call_bpf_faultable(struct trace_event_call *call, void *ctx);\ninclude/linux/trace_events.h-777-int perf_event_attach_bpf_prog(struct perf_event *event, struct bpf_prog *prog, u64 bpf_cookie);\n--\ninclude/linux/trace_events.h=793=int bpf_tracing_multi_attach(struct bpf_prog *prog, const union bpf_attr *attr);\ninclude/linux/trace_events.h-794-#else\ninclude/linux/trace_events.h:795:static inline unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx)\ninclude/linux/trace_events.h-796-{\n--\ninclude/linux/trace_events.h-799-\ninclude/linux/trace_events.h:800:static inline unsigned int trace_call_bpf_faultable(struct trace_event_call *call, void *ctx)\ninclude/linux/trace_events.h-801-{\n"
}

gemini-3.1-pro-preview

null

null

							input: 30711
							output: 26
							thoughts: 9
						

Okay, here's my attempt at summarizing the thought process, tailored for an expert audience, and written in the first person:

**Analyzing Usage Patterns**

Alright, so the task at hand is to understand the context and application of this concept. My first instinct is to immediately assess its usage patterns. I need to know where it's being deployed, across which domains, and in what specific implementations. I'm looking for the commonalities and the variations. Are we seeing it primarily in research, or is it making inroads into practical applications? What industries are adopting it, and why? Are there any clear leaders or lagging adopters? Understanding the "where" is the crucial first step. It provides the foundation for evaluating the efficacy and limitations within its application. The data will dictate my next step, be that a further examination of methodology or a comparison against other paradigms.

{
  "Expression": "trace_call_bpf",
  "PathPrefix": ""
}

{
  "Output": "include/linux/trace_events.h=759=trace_trigger_soft_disabled(struct trace_event_file *file)\n--\ninclude/linux/trace_events.h-774-#ifdef CONFIG_BPF_EVENTS\ninclude/linux/trace_events.h:775:unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx);\ninclude/linux/trace_events.h:776:unsigned int trace_call_bpf_faultable(struct trace_event_call *call, void *ctx);\ninclude/linux/trace_events.h-777-int perf_event_attach_bpf_prog(struct perf_event *event, struct bpf_prog *prog, u64 bpf_cookie);\n--\ninclude/linux/trace_events.h=793=int bpf_tracing_multi_attach(struct bpf_prog *prog, const union bpf_attr *attr);\ninclude/linux/trace_events.h-794-#else\ninclude/linux/trace_events.h:795:static inline unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx)\ninclude/linux/trace_events.h-796-{\n--\ninclude/linux/trace_events.h-799-\ninclude/linux/trace_events.h:800:static inline unsigned int trace_call_bpf_faultable(struct trace_event_call *call, void *ctx)\ninclude/linux/trace_events.h-801-{\n--\nkernel/events/core.c=11391=void perf_trace_run_bpf_submit(void *raw_data, int size, int rctx,\n--\nkernel/events/core.c-11397-\t\t*(struct pt_regs **)raw_data = regs;\nkernel/events/core.c:11398:\t\tif (!trace_call_bpf(call, raw_data) || hlist_empty(head)) {\nkernel/events/core.c-11399-\t\t\tperf_swevent_put_recursion_context(rctx);\n--\nkernel/trace/bpf_trace.c=96=static u64 bpf_uprobe_multi_entry_ip(struct bpf_run_ctx *ctx);\n--\nkernel/trace/bpf_trace.c-98-/**\nkernel/trace/bpf_trace.c:99: * trace_call_bpf - invoke BPF program\nkernel/trace/bpf_trace.c-100- * @call: tracepoint event\n--\nkernel/trace/bpf_trace.c-111- */\nkernel/trace/bpf_trace.c:112:unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx)\nkernel/trace/bpf_trace.c-113-{\n--\nkernel/trace/bpf_trace.c-139-\t * If bpf_prog_array_valid() fetched prog_array was\nkernel/trace/bpf_trace.c:140:\t * non-NULL, we go into trace_call_bpf() and do the actual\nkernel/trace/bpf_trace.c-141-\t * proper rcu_dereference() under RCU lock.\n--\nkernel/trace/bpf_trace.c-163-/**\nkernel/trace/bpf_trace.c:164: * trace_call_bpf_faultable - invoke BPF program in faultable context\nkernel/trace/bpf_trace.c-165- * @call: tracepoint event\n--\nkernel/trace/bpf_trace.c-167- *\nkernel/trace/bpf_trace.c:168: * Variant of trace_call_bpf() for faultable tracepoints (syscall\nkernel/trace/bpf_trace.c-169- * tracepoints). Supports sleepable BPF programs by using rcu_tasks_trace\n--\nkernel/trace/bpf_trace.c-178- */\nkernel/trace/bpf_trace.c:179:unsigned int trace_call_bpf_faultable(struct trace_event_call *call, void *ctx)\nkernel/trace/bpf_trace.c-180-{\n--\nkernel/trace/trace_kprobe.c=1683=kprobe_perf_func(struct trace_kprobe *tk, struct pt_regs *regs)\n--\nkernel/trace/trace_kprobe.c-1694-\nkernel/trace/trace_kprobe.c:1695:\t\tret = trace_call_bpf(call, regs);\nkernel/trace/trace_kprobe.c-1696-\n--\nkernel/trace/trace_kprobe.c=1732=kretprobe_perf_func(struct trace_kprobe *tk, struct kretprobe_instance *ri,\n--\nkernel/trace/trace_kprobe.c-1740-\nkernel/trace/trace_kprobe.c:1741:\tif (bpf_prog_array_valid(call) \u0026\u0026 !trace_call_bpf(call, regs))\nkernel/trace/trace_kprobe.c-1742-\t\treturn;\n--\nkernel/trace/trace_syscalls.c=1374=static int perf_call_bpf_enter(struct trace_event_call *call,\n--\nkernel/trace/trace_syscalls.c-1393-\t\tparam.args[i] = args[i];\nkernel/trace/trace_syscalls.c:1394:\treturn trace_call_bpf_faultable(call, \u0026param);\nkernel/trace/trace_syscalls.c-1395-}\n--\nkernel/trace/trace_syscalls.c=1525=static int perf_call_bpf_exit(struct trace_event_call *call,\n--\nkernel/trace/trace_syscalls.c-1539-\tparam.ret = ret_val;\nkernel/trace/trace_syscalls.c:1540:\treturn trace_call_bpf_faultable(call, \u0026param);\nkernel/trace/trace_syscalls.c-1541-}\n"
}

gemini-3.1-pro-preview

null

null

							input: 32445
							output: 33
							thoughts: 301
						

**My Analysis of BPF Tracepoint Execution and Configuration**

Okay, so `trace_call_bpf` is definitely called from `perf_trace_run_bpf_submit` in `kernel/events/core.c`. That's the core execution path for tracepoints with BPF programs attached; that's good, it's easily reachable and therefore testable. We're looking at a pretty direct path for our analysis.

Now, let's nail down the configuration options we need. We're concerned with `BPF_SYSCALL`, `BPF_EVENTS`, `PERF_EVENTS`, and `PROVE_LOCKING`. The question is, can we simply enable `BPF_EVENTS` or do we need to ensure its dependencies are set?

`BPF_EVENTS` is a boolean that defaults to 'y' based on the dependencies. It's dependent on `BPF_SYSCALL` *and* either `KPROBE_EVENTS` or `UPROBE_EVENTS` *and* `PERF_EVENTS`. Therefore, listing `BPF_SYSCALL`, `KPROBE_EVENTS`, `PERF_EVENTS`, and `PROVE_LOCKING` should be sufficient to enable it. There's no harm in listing `BPF_EVENTS` directly as well, might make things clearer.

Hang on... This patch specifically disables lockdep for the `lock_release` tracepoint. That implies the `lock_release` tracepoint *must* be enabled for the patch to even have an effect. Okay, so we need to verify its configuration. It's defined in `include/trace/events/lock.h`, which is included by `kernel/locking/lockdep.c`. I need to confirm that `lock_release` is actually used in `kernel/locking/lockdep.c`. This will give us valuable information about the system behavior.

{
  "Expression": "trace_lock_release",
  "PathPrefix": "kernel/locking/lockdep.c"
}

{
  "Output": "kernel/locking/lockdep.c=5875=void lock_release(struct lockdep_map *lock, unsigned long ip)\n--\nkernel/locking/lockdep.c-5878-\nkernel/locking/lockdep.c:5879:\ttrace_lock_release(lock, ip);\nkernel/locking/lockdep.c-5880-\n"
}

gemini-3.1-pro-preview

null

null

							input: 33290
							output: 167
							thoughts: 1353
						

**Analyzing the Impact of `BPF_NO_LOCKDEP` in Kernel Tracing**

Okay, so I've been looking at this patch and here's what I've got. The key is this new `TRACE_EVENT_FL_BPF_NO_LOCKDEP` flag.  It's specifically used in the `lock_release` tracepoint, which is defined in `kernel/locking/lockdep.c`.  This means `CONFIG_LOCKDEP` is a definite requirement, and indirectly `CONFIG_PROVE_LOCKING` as it enables `CONFIG_LOCKDEP`.

Let's break down the implications for fuzzing and configuration.  This change is *definitely* worth fuzzing, and the primary focus symbol for that fuzzing is `trace_call_bpf`.  In terms of configurations, the necessary ones are `BPF_SYSCALL`, `BPF_EVENTS`, `PERF_EVENTS`, and `PROVE_LOCKING`, which indirectly enables `LOCKDEP`. I had to double-check this, but `LOCKDEP` is a valid config and can be listed. However, `KPROBE_EVENTS` is also required, even though it isn't directly used by the `lock_release` tracepoint. The reason is because `BPF_EVENTS` depends on `KPROBE_EVENTS` (or `UPROBE_EVENTS`), and `PERF_EVENTS`.

Now, reviewing the patch itself, it's pretty straightforward.  There's a new flag, `TRACE_EVENT_FL_BPF_NO_LOCKDEP`, defined in `include/linux/trace_events.h`.  This flag gets added to the `lock_release` tracepoint in `include/trace/events/lock.h`. Critically, `kernel/trace/bpf_trace.c` is updated to check this new flag within the `trace_call_bpf` function. If the flag is set, lockdep is temporarily disabled before running the BPF program and re-enabled afterwards using `lockdep_off()` and `lockdep_on()`. The flag is added to the `lock_release` tracepoint using `TRACE_EVENT_FLAGS`. This new functionality is reachable and testable with syzkaller by attaching a BPF program to the `lock_release` tracepoint.

{
  "EnableConfigs": [
    "BPF_SYSCALL",
    "BPF_EVENTS",
    "PERF_EVENTS",
    "PROVE_LOCKING",
    "KPROBE_EVENTS"
  ],
  "FocusSymbols": [
    "trace_call_bpf"
  ],
  "Reasoning": "The patch functionally modifies `trace_call_bpf` to disable lockdep tracking while executing BPF programs attached to tracepoints with the `TRACE_EVENT_FL_BPF_NO_LOCKDEP` flag (such as `lock_release`). This is a reachable core kernel change that affects BPF tracing behavior and should be fuzzed to ensure it doesn't introduce regressions or unexpected behavior when BPF programs interact with locks.",
  "WorthFuzzing": true
}

{
  "EnableConfigs": [
    "BPF_SYSCALL",
    "BPF_EVENTS",
    "PERF_EVENTS",
    "PROVE_LOCKING",
    "KPROBE_EVENTS"
  ],
  "FocusSymbols": [
    "trace_call_bpf"
  ],
  "Reasoning": "The patch functionally modifies `trace_call_bpf` to disable lockdep tracking while executing BPF programs attached to tracepoints with the `TRACE_EVENT_FL_BPF_NO_LOCKDEP` flag (such as `lock_release`). This is a reachable core kernel change that affects BPF tracing behavior and should be fuzzed to ensure it doesn't introduce regressions or unexpected behavior when BPF programs interact with locks.",
  "WorthFuzzing": true
}