AI Trajectory

Trajectory: (Expand/Collapse All)
Seq	Timestamp	Type	Name	Duration
0/0	2026/08/25 13:41	flow	patch-triage	0m Args: null Results: { "EnableConfigs": null, "FocusSymbols": [], "KMSANReasoning": "", "NeedsKMSAN": false, "Reasoning": "The patch only modifies a selftest in tools/testing/selftests/mm/, which does not affect the kernel's functional logic.", "WorthFuzzing": false }
1/1	2026/08/25 13:41	action	read-patch-diff	0m Args: null Results: { "PatchDiff": "commit 4037680870e50908120aeef9ce76bdf84873ee8e\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Tue Aug 25 13:41:41 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/tools/testing/selftests/mm/pkey_sighandler_tests.c b/tools/testing/selftests/mm/pkey_sighandler_tests.c\nindex c218d0510a2a4..74bf79a5399da 100644\n--- a/tools/testing/selftests/mm/pkey_sighandler_tests.c\n+++ b/tools/testing/selftests/mm/pkey_sighandler_tests.c\n@@ -543,11 +543,12 @@ static void (pkey_tests[])(void) = {\n int main(int argc, char argv[])\n {\n \tksft_print_header();\n-\tksft_set_plan(ARRAY_SIZE(pkey_tests));\n \n \tif (!is_pkeys_supported())\n \t\tksft_exit_skip(\"pkeys not supported\\n\");\n \n+\tksft_set_plan(ARRAY_SIZE(pkey_tests));\n+\n \tfor (test_nr = 0; test_nr \u003c ARRAY_SIZE(pkey_tests); test_nr++) {\n \t\ttracing_on();\n \t\t(*pkey_tests[test_nr])();\n" }
2/1	2026/08/25 13:41	agent	patch-evaluator	0m Model: best-expensive Args: null Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch only modifies a selftest in tools/testing/selftests/mm/, which does not affect the kernel's functional logic.", "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 4037680870e50908120aeef9ce76bdf84873ee8e Author: syz-cluster <triage@syzkaller.com> Date: Tue Aug 25 13:41:41 2026 +0000 syz-cluster: applied patch under review diff --git a/tools/testing/selftests/mm/pkey_sighandler_tests.c b/tools/testing/selftests/mm/pkey_sighandler_tests.c index c218d0510a2a4..74bf79a5399da 100644 --- a/tools/testing/selftests/mm/pkey_sighandler_tests.c +++ b/tools/testing/selftests/mm/pkey_sighandler_tests.c @@ -543,11 +543,12 @@ static void (pkey_tests[])(void) = { int main(int argc, char argv[]) { ksft_print_header(); - ksft_set_plan(ARRAY_SIZE(pkey_tests)); if (!is_pkeys_supported()) ksft_exit_skip("pkeys not supported\n"); + ksft_set_plan(ARRAY_SIZE(pkey_tests)); + for (test_nr = 0; test_nr < ARRAY_SIZE(pkey_tests); test_nr++) { tracing_on(); (*pkey_tests[test_nr])();
3/2	2026/08/25 13:41	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 2077 output: 60 thoughts: 103 Thoughts: WorthFuzzing=false: A Quick Analysis of a Selftest Modification Okay, so I've looked over this patch. It's touching `tools/testing/selftests/mm/pkey_sighandler_tests.c`, and that immediately flags it as something internal to testing. Specifically, it seems to be reorganizing the setup for a selftest by moving `ksft_set_plan`. The key thing here is the placement of that `ksft_set_plan` call in relation to the `is_pkeys_supported()` check. The important point is that this is not a kernel code change. It’s a change to the test itself, a reordering of how the test suite is configured. It doesn't modify the core functionality that the kernel exposes, meaning it won't impact how the kernel behaves under load or interact with the fuzzers I'm using. Therefore, applying it would not create any value when it comes to kernel fuzzing efforts. It doesn't introduce any new attack surfaces or potentially expose anything new to the fuzzer. It's just a refactoring of the test infrastructure. So, WorthFuzzing=false. Let's move on.
4/2	2026/08/25 13:41	tool	set-results	0m Args: { "EnableConfigs": [], "FocusSymbols": [], "Reasoning": "The patch only modifies a selftest in tools/testing/selftests/mm/, which does not affect the kernel's functional logic.", "WorthFuzzing": false } Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch only modifies a selftest in tools/testing/selftests/mm/, which does not affect the kernel's functional logic.", "WorthFuzzing": false }
5/1	2026/08/25 13:41	action	If	0m Args: { "WorthFuzzing": false } Results: null

Trajectory: (Expand/Collapse All)

Seq

Timestamp

Type

Name

Duration

0/0

2026/08/25 13:41

flow

patch-triage

Args:

null

Results:

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "KMSANReasoning": "",
  "NeedsKMSAN": false,
  "Reasoning": "The patch only modifies a selftest in tools/testing/selftests/mm/, which does not affect the kernel's functional logic.",
  "WorthFuzzing": false
}

1/1

2026/08/25 13:41

action

read-patch-diff

Args:

null

Results:

{
  "PatchDiff": "commit 4037680870e50908120aeef9ce76bdf84873ee8e\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Tue Aug 25 13:41:41 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/tools/testing/selftests/mm/pkey_sighandler_tests.c b/tools/testing/selftests/mm/pkey_sighandler_tests.c\nindex c218d0510a2a4..74bf79a5399da 100644\n--- a/tools/testing/selftests/mm/pkey_sighandler_tests.c\n+++ b/tools/testing/selftests/mm/pkey_sighandler_tests.c\n@@ -543,11 +543,12 @@ static void (*pkey_tests[])(void) = {\n int main(int argc, char *argv[])\n {\n \tksft_print_header();\n-\tksft_set_plan(ARRAY_SIZE(pkey_tests));\n \n \tif (!is_pkeys_supported())\n \t\tksft_exit_skip(\"pkeys not supported\\n\");\n \n+\tksft_set_plan(ARRAY_SIZE(pkey_tests));\n+\n \tfor (test_nr = 0; test_nr \u003c ARRAY_SIZE(pkey_tests); test_nr++) {\n \t\ttracing_on();\n \t\t(*pkey_tests[test_nr])();\n"
}

2/1

2026/08/25 13:41

agent

patch-evaluator

Model:

best-expensive

Args:

null

Results:

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies a selftest in tools/testing/selftests/mm/, which does not affect the kernel's functional logic.",
  "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 4037680870e50908120aeef9ce76bdf84873ee8e
Author: syz-cluster <triage@syzkaller.com>
Date:   Tue Aug 25 13:41:41 2026 +0000

    syz-cluster: applied patch under review

diff --git a/tools/testing/selftests/mm/pkey_sighandler_tests.c b/tools/testing/selftests/mm/pkey_sighandler_tests.c
index c218d0510a2a4..74bf79a5399da 100644
--- a/tools/testing/selftests/mm/pkey_sighandler_tests.c
+++ b/tools/testing/selftests/mm/pkey_sighandler_tests.c
@@ -543,11 +543,12 @@ static void (*pkey_tests[])(void) = {
 int main(int argc, char *argv[])
 {
 	ksft_print_header();
-	ksft_set_plan(ARRAY_SIZE(pkey_tests));
 
 	if (!is_pkeys_supported())
 		ksft_exit_skip("pkeys not supported\n");
 
+	ksft_set_plan(ARRAY_SIZE(pkey_tests));
+
 	for (test_nr = 0; test_nr < ARRAY_SIZE(pkey_tests); test_nr++) {
 		tracing_on();
 		(*pkey_tests[test_nr])();

3/2

2026/08/25 13:41

llm

patch-evaluator

Model:

gemini-3.1-pro-preview

Args:

null

Results:

null

Tokens:

							input: 2077
							output: 60
							thoughts: 103

Thoughts:

**WorthFuzzing=false: A Quick Analysis of a Selftest Modification**

Okay, so I've looked over this patch. It's touching `tools/testing/selftests/mm/pkey_sighandler_tests.c`, and that immediately flags it as something internal to testing. Specifically, it seems to be reorganizing the setup for a selftest by moving `ksft_set_plan`. The key thing here is the placement of that `ksft_set_plan` call in relation to the `is_pkeys_supported()` check.

The important point is that this is *not* a kernel code change. It’s a change to the *test* itself, a reordering of how the test suite is configured. It doesn't modify the core functionality that the kernel exposes, meaning it won't impact how the kernel behaves under load or interact with the fuzzers I'm using.

Therefore, applying it would not create any value when it comes to kernel fuzzing efforts. It doesn't introduce any new attack surfaces or potentially expose anything new to the fuzzer. It's just a refactoring of the test infrastructure.

So, *WorthFuzzing=false*. Let's move on.

4/2

2026/08/25 13:41

tool

set-results

Args:

{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies a selftest in tools/testing/selftests/mm/, which does not affect the kernel's functional logic.",
  "WorthFuzzing": false
}

Results:

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies a selftest in tools/testing/selftests/mm/, which does not affect the kernel's functional logic.",
  "WorthFuzzing": false
}

5/1

2026/08/25 13:41

action

Args:

{
  "WorthFuzzing": false
}

Results:

null

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)