AI Trajectory

null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies userspace tooling (tools/perf/), which is not part of the kernel code fuzzed by syzkaller.",
  "WorthFuzzing": false
}

null

{
  "PatchDiff": "commit 1ddc0b3499f187c01ff53937290340d36484ae13\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Mon Jun 22 11:01:55 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c\nindex 48615ddccd93a1..9903d79c4b77a5 100644\n--- a/tools/perf/builtin-trace.c\n+++ b/tools/perf/builtin-trace.c\n@@ -964,7 +964,7 @@ static bool syscall_arg__strtoul_btf_enum(char *bf, size_t size, struct syscall_\n \tstruct btf *btf = arg-\u003etrace-\u003ebtf;\n \tstruct btf_enum *be = btf_enum(bt);\n \n-\tfor (int i = 0; i \u003c btf_vlen(bt); ++i, ++be) {\n+\tfor (unsigned int i = 0; i \u003c btf_vlen(bt); ++i, ++be) {\n \t\tconst char *name = btf__name_by_offset(btf, be-\u003ename_off);\n \t\tint max_len = max(size, strlen(name));\n \n@@ -1009,9 +1009,9 @@ static bool syscall_arg__strtoul_btf_type(char *bf, size_t size, struct syscall_\n static size_t btf_enum_scnprintf(const struct btf_type *type, struct btf *btf, char *bf, size_t size, int val)\n {\n \tstruct btf_enum *be = btf_enum(type);\n-\tconst int nr_entries = btf_vlen(type);\n+\tconst unsigned int nr_entries = btf_vlen(type);\n \n-\tfor (int i = 0; i \u003c nr_entries; ++i, ++be) {\n+\tfor (unsigned int i = 0; i \u003c nr_entries; ++i, ++be) {\n \t\tif (be-\u003eval == val) {\n \t\t\treturn scnprintf(bf, size, \"%s\",\n \t\t\t\t\t btf__name_by_offset(btf, be-\u003ename_off));\ndiff --git a/tools/perf/util/btf.c b/tools/perf/util/btf.c\nindex bb163fe87767cf..1716b49d3568e0 100644\n--- a/tools/perf/util/btf.c\n+++ b/tools/perf/util/btf.c\n@@ -14,7 +14,7 @@ const struct btf_member *__btf_type__find_member_by_name(struct btf *btf,\n {\n \tconst struct btf_type *t = btf__type_by_id(btf, type_id);\n \tconst struct btf_member *m;\n-\tint i;\n+\tunsigned int i;\n \n \tfor (i = 0, m = btf_members(t); i \u003c btf_vlen(t); i++, m++) {\n \t\tconst char *current_member_name = btf__name_by_offset(btf, m-\u003ename_off);\n"
}

gemini-3.1-pro-preview

null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies userspace tooling (tools/perf/), which is not part of the kernel code fuzzed by syzkaller.",
  "WorthFuzzing": false
}

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.

For your convenience, here is the diff of the changes:
commit 1ddc0b3499f187c01ff53937290340d36484ae13
Author: syz-cluster <triage@syzkaller.com>
Date:   Mon Jun 22 11:01:55 2026 +0000

    syz-cluster: applied patch under review

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 48615ddccd93a1..9903d79c4b77a5 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -964,7 +964,7 @@ static bool syscall_arg__strtoul_btf_enum(char *bf, size_t size, struct syscall_
 	struct btf *btf = arg->trace->btf;
 	struct btf_enum *be = btf_enum(bt);
 
-	for (int i = 0; i < btf_vlen(bt); ++i, ++be) {
+	for (unsigned int i = 0; i < btf_vlen(bt); ++i, ++be) {
 		const char *name = btf__name_by_offset(btf, be->name_off);
 		int max_len = max(size, strlen(name));
 
@@ -1009,9 +1009,9 @@ static bool syscall_arg__strtoul_btf_type(char *bf, size_t size, struct syscall_
 static size_t btf_enum_scnprintf(const struct btf_type *type, struct btf *btf, char *bf, size_t size, int val)
 {
 	struct btf_enum *be = btf_enum(type);
-	const int nr_entries = btf_vlen(type);
+	const unsigned int nr_entries = btf_vlen(type);
 
-	for (int i = 0; i < nr_entries; ++i, ++be) {
+	for (unsigned int i = 0; i < nr_entries; ++i, ++be) {
 		if (be->val == val) {
 			return scnprintf(bf, size, "%s",
 					 btf__name_by_offset(btf, be->name_off));
diff --git a/tools/perf/util/btf.c b/tools/perf/util/btf.c
index bb163fe87767cf..1716b49d3568e0 100644
--- a/tools/perf/util/btf.c
+++ b/tools/perf/util/btf.c
@@ -14,7 +14,7 @@ const struct btf_member *__btf_type__find_member_by_name(struct btf *btf,
 {
 	const struct btf_type *t = btf__type_by_id(btf, type_id);
 	const struct btf_member *m;
-	int i;
+	unsigned int i;
 
 	for (i = 0, m = btf_members(t); i < btf_vlen(t); i++, m++) {
 		const char *current_member_name = btf__name_by_offset(btf, m->name_off);

gemini-3.1-pro-preview

null

null

							input: 2385
							output: 59
							thoughts: 315
						

**WorthFuzzing=false: A Quick Decision**

Okay, here's what I'm seeing: a diff touches `tools/perf/builtin-trace.c` and `tools/perf/util/btf.c`. The changes are replacing `int i` with `unsigned int i` within `for` loops that use `btf_vlen(bt)`. The key here is that this is *userspace* tooling, specifically `tools/perf/`, not anything within the kernel itself.

Now, based on the instructions I know, if the patch *only* contains changes to `Documentation/`, `Kconfig` files, code comments, decorative changes like logging, changes to numeric constants/macros that don't alter execution, or unreachable code paths in virtualized environments, then `WorthFuzzing=false`. And this seems to be a clear fit. This is userspace code and Syzkaller, which is what we use for fuzzing, focuses on the kernel.

I need to confirm there are *no* kernel modifications. Let me double-check the files... nope, just `tools/perf/builtin-trace.c` and `tools/perf/util/btf.c`. No kernel code changes.

Alright, the decision is clear. I'm setting `WorthFuzzing=false`.

{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies userspace tooling (tools/perf/), which is not part of the kernel code fuzzed by syzkaller.",
  "WorthFuzzing": false
}

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies userspace tooling (tools/perf/), which is not part of the kernel code fuzzed by syzkaller.",
  "WorthFuzzing": false
}