AI Trajectory

Trajectory: (Expand/Collapse All)
Seq	Timestamp	Type	Name	Duration
0/0	2026/07/22 01:00	flow	patch-triage	0m Args: null Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch only modifies a macro definition when __CHECKER__ is defined, which is used for static analysis (Sparse) and does not affect the compiled kernel code.", "WorthFuzzing": false }
1/1	2026/07/22 01:00	action	read-patch-diff	0m Args: null Results: { "PatchDiff": "commit 660ab989940cc5a7d0224b7d8d91f7a4925f41e9\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Wed Jul 22 01:00:46 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/include/linux/slab.h b/include/linux/slab.h\nindex 51f03f18c9a7b4..7ffe152ce48326 100644\n--- a/include/linux/slab.h\n+++ b/include/linux/slab.h\n@@ -505,8 +505,12 @@ typedef struct { unsigned long v; } kmalloc_token_t;\n extern unsigned long random_kmalloc_seed;\n #define __kmalloc_token(...) ((kmalloc_token_t){ .v = _CODE_LOCATION_ })\n #elif defined(CONFIG_KMALLOC_PARTITION_TYPED)\n+#ifdef __CHECKER__\n+#define __kmalloc_token(...) ((kmalloc_token_t){ .v = 0 })\n+#else /* !__CHECKER__ /\n #define __kmalloc_token(...) ((kmalloc_token_t){ .v = __builtin_infer_alloc_token(__VA_ARGS__) })\n-#endif\n+#endif / __CHECKER__ /\n+#endif / CONFIG_KMALLOC_PARTITION_TYPED */\n #define DECL_TOKEN_PARAM(_token)\t, kmalloc_token_t (_token)\n #define _PASS_TOKEN_PARAM(_token)\t, (_token)\n #define PASS_TOKEN_PARAM(_token)\t(_token)\n" }
2/1	2026/07/22 01:00	agent	patch-evaluator	0m Model: best-expensive Args: null Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch only modifies a macro definition when __CHECKER__ is defined, which is used for static analysis (Sparse) and does not affect the compiled kernel code.", "WorthFuzzing": false } Instruction: 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). 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. 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. Do not list too generic configs (we already have them enabled). Only list those that specifically cover the modified code. 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. Prompt: For your convenience, here is the diff of the changes: commit 660ab989940cc5a7d0224b7d8d91f7a4925f41e9 Author: syz-cluster <triage@syzkaller.com> Date: Wed Jul 22 01:00:46 2026 +0000 syz-cluster: applied patch under review diff --git a/include/linux/slab.h b/include/linux/slab.h index 51f03f18c9a7b4..7ffe152ce48326 100644 --- a/include/linux/slab.h +++ b/include/linux/slab.h @@ -505,8 +505,12 @@ typedef struct { unsigned long v; } kmalloc_token_t; extern unsigned long random_kmalloc_seed; #define __kmalloc_token(...) ((kmalloc_token_t){ .v = _CODE_LOCATION_ }) #elif defined(CONFIG_KMALLOC_PARTITION_TYPED) +#ifdef __CHECKER__ +#define __kmalloc_token(...) ((kmalloc_token_t){ .v = 0 }) +#else /* !__CHECKER__ / #define __kmalloc_token(...) ((kmalloc_token_t){ .v = __builtin_infer_alloc_token(__VA_ARGS__) }) -#endif +#endif / __CHECKER__ / +#endif / CONFIG_KMALLOC_PARTITION_TYPED */ #define DECL_TOKEN_PARAM(_token) , kmalloc_token_t (_token) #define _PASS_TOKEN_PARAM(_token) , (_token) #define PASS_TOKEN_PARAM(_token) (_token)
3/2	2026/07/22 01:00	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 2008 output: 64 thoughts: 212 Thoughts: WorthFuzzing Assessment: No Functional Impact Okay, so I've examined this patch and it's modifying `include/linux/slab.h`. The core of the change is focused on how `__kmalloc_token(...)` behaves, but only under specific circumstances: when `CONFIG_KMALLOC_PARTITION_TYPED` is enabled. My key takeaway is that this is a static analysis optimization, not a runtime code modification. Specifically, the patch introduces a conditional check for `__CHECKER__`, which is the preprocessor symbol used by Sparse (the static analyzer). If `__CHECKER__` is present, the macro assigns a value of zero to the token. Otherwise, it uses `__builtin_infer_alloc_token` as originally intended. The rationale is clear; this adjustment is meant to avoid Sparse from generating errors or warnings related to `__builtin_infer_alloc_token`. It's essentially a workaround for a static analysis tool, to keep it happy, and doesn't introduce any new runtime behavior. The actual compiled kernel code remains unchanged. Therefore, this patch has absolutely no functional impact that's relevant to fuzzing. My conclusion is that this is not worth fuzzing. I will return WorthFuzzing=false, given the lack of any observable changes to kernel execution.
4/2	2026/07/22 01:00	tool	set-results	0m Args: { "EnableConfigs": [], "FocusSymbols": [], "Reasoning": "The patch only modifies a macro definition when __CHECKER__ is defined, which is used for static analysis (Sparse) and does not affect the compiled kernel code.", "WorthFuzzing": false } Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch only modifies a macro definition when __CHECKER__ is defined, which is used for static analysis (Sparse) and does not affect the compiled kernel code.", "WorthFuzzing": false }

Trajectory: (Expand/Collapse All)

Seq

Timestamp

Type

Name

Duration

0/0

2026/07/22 01:00

flow

patch-triage

Args:

null

Results:

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies a macro definition when __CHECKER__ is defined, which is used for static analysis (Sparse) and does not affect the compiled kernel code.",
  "WorthFuzzing": false
}

1/1

2026/07/22 01:00

action

read-patch-diff

Args:

null

Results:

{
  "PatchDiff": "commit 660ab989940cc5a7d0224b7d8d91f7a4925f41e9\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Wed Jul 22 01:00:46 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/include/linux/slab.h b/include/linux/slab.h\nindex 51f03f18c9a7b4..7ffe152ce48326 100644\n--- a/include/linux/slab.h\n+++ b/include/linux/slab.h\n@@ -505,8 +505,12 @@ typedef struct { unsigned long v; } kmalloc_token_t;\n extern unsigned long random_kmalloc_seed;\n #define __kmalloc_token(...) ((kmalloc_token_t){ .v = _CODE_LOCATION_ })\n #elif defined(CONFIG_KMALLOC_PARTITION_TYPED)\n+#ifdef __CHECKER__\n+#define __kmalloc_token(...) ((kmalloc_token_t){ .v = 0 })\n+#else /* !__CHECKER__ */\n #define __kmalloc_token(...) ((kmalloc_token_t){ .v = __builtin_infer_alloc_token(__VA_ARGS__) })\n-#endif\n+#endif /* __CHECKER__ */\n+#endif /* CONFIG_KMALLOC_PARTITION_TYPED */\n #define DECL_TOKEN_PARAM(_token)\t, kmalloc_token_t (_token)\n #define _PASS_TOKEN_PARAM(_token)\t, (_token)\n #define PASS_TOKEN_PARAM(_token)\t(_token)\n"
}

2/1

2026/07/22 01:00

agent

patch-evaluator

Model:

best-expensive

Args:

null

Results:

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies a macro definition when __CHECKER__ is defined, which is used for static analysis (Sparse) and does not affect the compiled kernel code.",
  "WorthFuzzing": false
}

Instruction:

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).

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.
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.
   Do not list too generic configs (we already have them enabled). Only list those that
   specifically cover the modified code. 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.

Prompt:

For your convenience, here is the diff of the changes:
commit 660ab989940cc5a7d0224b7d8d91f7a4925f41e9
Author: syz-cluster <triage@syzkaller.com>
Date:   Wed Jul 22 01:00:46 2026 +0000

    syz-cluster: applied patch under review

diff --git a/include/linux/slab.h b/include/linux/slab.h
index 51f03f18c9a7b4..7ffe152ce48326 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -505,8 +505,12 @@ typedef struct { unsigned long v; } kmalloc_token_t;
 extern unsigned long random_kmalloc_seed;
 #define __kmalloc_token(...) ((kmalloc_token_t){ .v = _CODE_LOCATION_ })
 #elif defined(CONFIG_KMALLOC_PARTITION_TYPED)
+#ifdef __CHECKER__
+#define __kmalloc_token(...) ((kmalloc_token_t){ .v = 0 })
+#else /* !__CHECKER__ */
 #define __kmalloc_token(...) ((kmalloc_token_t){ .v = __builtin_infer_alloc_token(__VA_ARGS__) })
-#endif
+#endif /* __CHECKER__ */
+#endif /* CONFIG_KMALLOC_PARTITION_TYPED */
 #define DECL_TOKEN_PARAM(_token)	, kmalloc_token_t (_token)
 #define _PASS_TOKEN_PARAM(_token)	, (_token)
 #define PASS_TOKEN_PARAM(_token)	(_token)

3/2

2026/07/22 01:00

llm

patch-evaluator

Model:

gemini-3.1-pro-preview

Args:

null

Results:

null

Tokens:

							input: 2008
							output: 64
							thoughts: 212

Thoughts:

**WorthFuzzing Assessment: No Functional Impact**

Okay, so I've examined this patch and it's modifying `include/linux/slab.h`. The core of the change is focused on how `__kmalloc_token(...)` behaves, but only under specific circumstances: when `CONFIG_KMALLOC_PARTITION_TYPED` is enabled. My key takeaway is that this is a static analysis optimization, not a runtime code modification.

Specifically, the patch introduces a conditional check for `__CHECKER__`, which is the preprocessor symbol used by Sparse (the static analyzer). If `__CHECKER__` is present, the macro assigns a value of zero to the token. Otherwise, it uses `__builtin_infer_alloc_token` as originally intended.

The rationale is clear; this adjustment is meant to avoid Sparse from generating errors or warnings related to `__builtin_infer_alloc_token`. It's essentially a workaround for a static analysis tool, to keep it happy, and doesn't introduce any new runtime behavior. The actual compiled kernel code remains unchanged. Therefore, this patch has absolutely no functional impact that's relevant to fuzzing.

My conclusion is that this is *not* worth fuzzing. I will return WorthFuzzing=false, given the lack of any observable changes to kernel execution.

4/2

2026/07/22 01:00

tool

set-results

Args:

{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies a macro definition when __CHECKER__ is defined, which is used for static analysis (Sparse) and does not affect the compiled kernel code.",
  "WorthFuzzing": false
}

Results:

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies a macro definition when __CHECKER__ is defined, which is used for static analysis (Sparse) and does not affect the compiled kernel code.",
  "WorthFuzzing": false
}

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

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