AI Trajectory

Trajectory: (Expand/Collapse All)
Seq	Timestamp	Type	Name	Duration
0/0	2026/08/01 04:46	flow	patch-triage	0m Args: null Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch only changes the default value of a module parameter (min_unref_scans) based on Kconfig options. This is a change to a numeric constant that does not functionally alter execution flow, so it does not require fuzzing.", "WorthFuzzing": false }
1/1	2026/08/01 04:46	action	read-patch-diff	0m Args: null Results: { "PatchDiff": "commit b0a0fde85c334518c87939cf032e481c54558a81\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Sat Aug 1 04:46:46 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/mm/kmemleak.c b/mm/kmemleak.c\nindex f63dfacee7ca1..6c31e66915ec7 100644\n--- a/mm/kmemleak.c\n+++ b/mm/kmemleak.c\n@@ -237,7 +237,13 @@ static struct task_struct scan_thread;\n / used to avoid reporting of recently allocated objects /\n static unsigned long jiffies_min_age;\n / consecutive scans an object must stay unreferenced before reporting /\n-static unsigned int min_unref_scans = 1;\n+#if IS_ENABLED(CONFIG_DEBUG_KMEMLEAK_VERBOSE) \u0026\u0026 \\\n+\tIS_ENABLED(CONFIG_DEBUG_KMEMLEAK_AUTO_SCAN)\n+#define MIN_UNREF_SCANS_DEFAULT\t2\n+#else\n+#define MIN_UNREF_SCANS_DEFAULT\t1\n+#endif\n+static unsigned int min_unref_scans = MIN_UNREF_SCANS_DEFAULT;\n module_param(min_unref_scans, uint, 0644);\n static unsigned long jiffies_last_scan;\n / delay between automatic memory scannings */\n" }
2/1	2026/08/01 04:46	agent	patch-evaluator	0m Model: best-expensive Args: null Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch only changes the default value of a module parameter (min_unref_scans) based on Kconfig options. This is a change to a numeric constant that does not functionally alter execution flow, so it does not require fuzzing.", "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). - 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. Prompt: For your convenience, here is the diff of the changes: commit b0a0fde85c334518c87939cf032e481c54558a81 Author: syz-cluster <triage@syzkaller.com> Date: Sat Aug 1 04:46:46 2026 +0000 syz-cluster: applied patch under review diff --git a/mm/kmemleak.c b/mm/kmemleak.c index f63dfacee7ca1..6c31e66915ec7 100644 --- a/mm/kmemleak.c +++ b/mm/kmemleak.c @@ -237,7 +237,13 @@ static struct task_struct scan_thread; / used to avoid reporting of recently allocated objects / static unsigned long jiffies_min_age; / consecutive scans an object must stay unreferenced before reporting / -static unsigned int min_unref_scans = 1; +#if IS_ENABLED(CONFIG_DEBUG_KMEMLEAK_VERBOSE) && \ + IS_ENABLED(CONFIG_DEBUG_KMEMLEAK_AUTO_SCAN) +#define MIN_UNREF_SCANS_DEFAULT 2 +#else +#define MIN_UNREF_SCANS_DEFAULT 1 +#endif +static unsigned int min_unref_scans = MIN_UNREF_SCANS_DEFAULT; module_param(min_unref_scans, uint, 0644); static unsigned long jiffies_last_scan; / delay between automatic memory scannings */
3/2	2026/08/01 04:46	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 2139 output: 81 thoughts: 241 Thoughts: WorthFuzzing Assessment Okay, so I'm looking at this patch for `mm/kmemleak.c`. It's pretty straightforward – just tweaking the default value of `min_unref_scans` from 1 to 2, but only if `CONFIG_DEBUG_KMEMLEAK_VERBOSE` and `CONFIG_DEBUG_KMEMLEAK_AUTO_SCAN` are enabled. It's a simple alteration of a numeric constant, specifically the default for a module parameter. Let me just quickly re-read the instructions... Right, it says: "Return WorthFuzzing=false if the patch only contains… changes to numeric constants or macros that do not functionally alter execution flow." This is exactly that. It's not changing the core logic, just the sensitivity threshold. The flow of the kmemleak scanner remains the same; it's just the number of times an object must be unseen before being reported that changes. Therefore, given my understanding of the fuzzing requirements and the nature of this change, I will return `WorthFuzzing=false`.
4/2	2026/08/01 04:46	tool	set-results	0m Args: { "EnableConfigs": [], "FocusSymbols": [], "Reasoning": "The patch only changes the default value of a module parameter (min_unref_scans) based on Kconfig options. This is a change to a numeric constant that does not functionally alter execution flow, so it does not require fuzzing.", "WorthFuzzing": false } Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch only changes the default value of a module parameter (min_unref_scans) based on Kconfig options. This is a change to a numeric constant that does not functionally alter execution flow, so it does not require fuzzing.", "WorthFuzzing": false }

Trajectory: (Expand/Collapse All)

Seq

Timestamp

Type

Name

Duration

0/0

2026/08/01 04:46

flow

patch-triage

Args:

null

Results:

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only changes the default value of a module parameter (min_unref_scans) based on Kconfig options. This is a change to a numeric constant that does not functionally alter execution flow, so it does not require fuzzing.",
  "WorthFuzzing": false
}

1/1

2026/08/01 04:46

action

read-patch-diff

Args:

null

Results:

{
  "PatchDiff": "commit b0a0fde85c334518c87939cf032e481c54558a81\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Sat Aug 1 04:46:46 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/mm/kmemleak.c b/mm/kmemleak.c\nindex f63dfacee7ca1..6c31e66915ec7 100644\n--- a/mm/kmemleak.c\n+++ b/mm/kmemleak.c\n@@ -237,7 +237,13 @@ static struct task_struct *scan_thread;\n /* used to avoid reporting of recently allocated objects */\n static unsigned long jiffies_min_age;\n /* consecutive scans an object must stay unreferenced before reporting */\n-static unsigned int min_unref_scans = 1;\n+#if IS_ENABLED(CONFIG_DEBUG_KMEMLEAK_VERBOSE) \u0026\u0026 \\\n+\tIS_ENABLED(CONFIG_DEBUG_KMEMLEAK_AUTO_SCAN)\n+#define MIN_UNREF_SCANS_DEFAULT\t2\n+#else\n+#define MIN_UNREF_SCANS_DEFAULT\t1\n+#endif\n+static unsigned int min_unref_scans = MIN_UNREF_SCANS_DEFAULT;\n module_param(min_unref_scans, uint, 0644);\n static unsigned long jiffies_last_scan;\n /* delay between automatic memory scannings */\n"
}

2/1

2026/08/01 04:46

agent

patch-evaluator

Model:

best-expensive

Args:

null

Results:

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only changes the default value of a module parameter (min_unref_scans) based on Kconfig options. This is a change to a numeric constant that does not functionally alter execution flow, so it does not require fuzzing.",
  "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).
- 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.

Prompt:

For your convenience, here is the diff of the changes:
commit b0a0fde85c334518c87939cf032e481c54558a81
Author: syz-cluster <triage@syzkaller.com>
Date:   Sat Aug 1 04:46:46 2026 +0000

    syz-cluster: applied patch under review

diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index f63dfacee7ca1..6c31e66915ec7 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -237,7 +237,13 @@ static struct task_struct *scan_thread;
 /* used to avoid reporting of recently allocated objects */
 static unsigned long jiffies_min_age;
 /* consecutive scans an object must stay unreferenced before reporting */
-static unsigned int min_unref_scans = 1;
+#if IS_ENABLED(CONFIG_DEBUG_KMEMLEAK_VERBOSE) && \
+	IS_ENABLED(CONFIG_DEBUG_KMEMLEAK_AUTO_SCAN)
+#define MIN_UNREF_SCANS_DEFAULT	2
+#else
+#define MIN_UNREF_SCANS_DEFAULT	1
+#endif
+static unsigned int min_unref_scans = MIN_UNREF_SCANS_DEFAULT;
 module_param(min_unref_scans, uint, 0644);
 static unsigned long jiffies_last_scan;
 /* delay between automatic memory scannings */

3/2

2026/08/01 04:46

llm

patch-evaluator

Model:

gemini-3.1-pro-preview

Args:

null

Results:

null

Tokens:

							input: 2139
							output: 81
							thoughts: 241

Thoughts:

**WorthFuzzing Assessment**

Okay, so I'm looking at this patch for `mm/kmemleak.c`. It's pretty straightforward – just tweaking the default value of `min_unref_scans` from 1 to 2, but *only* if `CONFIG_DEBUG_KMEMLEAK_VERBOSE` and `CONFIG_DEBUG_KMEMLEAK_AUTO_SCAN` are enabled. It's a simple alteration of a numeric constant, specifically the default for a module parameter.

Let me just quickly re-read the instructions... Right, it says: "Return WorthFuzzing=false if the patch only contains… changes to numeric constants or macros that do not functionally alter execution flow." This is *exactly* that. It's not changing the core logic, just the sensitivity threshold. The flow of the kmemleak scanner remains the same; it's just the number of times an object must be unseen before being reported that changes. Therefore, given my understanding of the fuzzing requirements and the nature of this change, I will return `WorthFuzzing=false`.

4/2

2026/08/01 04:46

tool

set-results

Args:

{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch only changes the default value of a module parameter (min_unref_scans) based on Kconfig options. This is a change to a numeric constant that does not functionally alter execution flow, so it does not require fuzzing.",
  "WorthFuzzing": false
}

Results:

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only changes the default value of a module parameter (min_unref_scans) based on Kconfig options. This is a change to a numeric constant that does not functionally alter execution flow, so it does not require fuzzing.",
  "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)