AI Trajectory


Trajectory: (Expand/Collapse All)
Seq Timestamp Type Name Duration
0/0 2026/08/27 16:41 flow patch-triage
0m Args: 
null

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "KMSANReasoning": "",
  "NeedsKMSAN": false,
  "Reasoning": "The patch only modifies the userspace bpftool utility and its documentation. It does not make any functional changes to the kernel code.",
  "WorthFuzzing": false
}
1/1 2026/08/27 16:41 action read-patch-diff
0m Args: 
null

Results: 
{
  "PatchDiff": "commit 8af3e8c61a7ea323bed8695c767ff906f524b62e\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Thu Aug 27 16:41:12 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/tools/bpf/bpftool/Documentation/bpftool-prog.rst b/tools/bpf/bpftool/Documentation/bpftool-prog.rst\nindex 90fa2a48cc26a..2280dc4492c06 100644\n--- a/tools/bpf/bpftool/Documentation/bpftool-prog.rst\n+++ b/tools/bpf/bpftool/Documentation/bpftool-prog.rst\n@@ -217,7 +217,9 @@ bpftool prog run *PROG* data_in *FILE* [data_out *FILE* [data_size_out *L*]] [ct\n bpftool prog profile *PROG* [duration *DURATION*] *METRICs*\n     Profile *METRICs* for bpf program *PROG* for *DURATION* seconds or until\n     user hits \u003cCtrl+C\u003e. *DURATION* is optional. If *DURATION* is not specified,\n-    the profiling will run up to **UINT_MAX** seconds.\n+    the profiling will run up to **UINT_MAX** seconds. When **cycles** is\n+    selected, plain output also reports the average number of cycles per\n+    program run.\n \n bpftool prog help\n     Print short help message.\n@@ -360,7 +362,7 @@ EXAMPLES\n ::\n \n          51397 run_cnt\n-      40176203 cycles                                                 (83.05%)\n+      40176203 cycles          # 781.68 cycles per run                (83.05%)\n       42518139 instructions    #   1.06 insns per cycle               (83.39%)\n            123 llc_misses      #   2.89 LLC misses per million insns  (83.15%)\n \ndiff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c\nindex a9f730d407a92..8935508f955b1 100644\n--- a/tools/bpf/bpftool/prog.c\n+++ b/tools/bpf/bpftool/prog.c\n@@ -2069,9 +2069,9 @@ struct profile_metric {\n \tbool selected;\n \n \t/* calculate ratios like instructions per cycle */\n-\tconst int ratio_metric; /* 0 for N/A, 1 for index 0 (cycles) */\n+\tconst int ratio_metric; /* 0 for run_cnt, 1 for index 0 (cycles) */\n \tconst char *ratio_desc;\n-\tconst float ratio_mul;\n+\tconst double ratio_mul;\n } metrics[] = {\n \t{\n \t\t.name = \"cycles\",\n@@ -2080,6 +2080,9 @@ struct profile_metric {\n \t\t\t.config = PERF_COUNT_HW_CPU_CYCLES,\n \t\t\t.exclude_user = 1,\n \t\t},\n+\t\t.ratio_metric = 0,\n+\t\t.ratio_desc = \"cycles per run\",\n+\t\t.ratio_mul = 1.0,\n \t},\n \t{\n \t\t.name = \"instructions\",\n@@ -2256,17 +2259,18 @@ static void profile_print_readings_plain(void)\n \tfor (m = 0; m \u003c ARRAY_SIZE(metrics); m++) {\n \t\tstruct bpf_perf_event_value *val = \u0026metrics[m].val;\n \t\tint r;\n+\t\t__u64 ratio;\n \n \t\tif (!metrics[m].selected)\n \t\t\tcontinue;\n \t\tprintf(\"%18llu %-20s\", val-\u003ecounter, metrics[m].name);\n \n-\t\tr = metrics[m].ratio_metric - 1;\n-\t\tif (r \u003e= 0 \u0026\u0026 metrics[r].selected \u0026\u0026\n-\t\t    metrics[r].val.counter \u003e 0) {\n+\t\tr = metrics[m].ratio_metric;\n+\t\t/* r == 0 is a special case for run_cnt */\n+\t\tratio = r ? metrics[r - 1].val.counter : profile_total_count;\n+\t\tif (metrics[m].ratio_desc \u0026\u0026 ratio) {\n \t\t\tprintf(\"# %8.2f %-30s\",\n-\t\t\t       val-\u003ecounter * metrics[m].ratio_mul /\n-\t\t\t       metrics[r].val.counter,\n+\t\t\t       val-\u003ecounter * metrics[m].ratio_mul / ratio,\n \t\t\t       metrics[m].ratio_desc);\n \t\t} else {\n \t\t\tprintf(\"%-41s\", \"\");\n"
}
2/1 2026/08/27 16:41 agent patch-evaluator
0m Model: 
best-expensive

Args: 
null

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies the userspace bpftool utility and its documentation. It does not make any functional changes to the 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).
- 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 8af3e8c61a7ea323bed8695c767ff906f524b62e
Author: syz-cluster <triage@syzkaller.com>
Date:   Thu Aug 27 16:41:12 2026 +0000

    syz-cluster: applied patch under review

diff --git a/tools/bpf/bpftool/Documentation/bpftool-prog.rst b/tools/bpf/bpftool/Documentation/bpftool-prog.rst
index 90fa2a48cc26a..2280dc4492c06 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-prog.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-prog.rst
@@ -217,7 +217,9 @@ bpftool prog run *PROG* data_in *FILE* [data_out *FILE* [data_size_out *L*]] [ct
 bpftool prog profile *PROG* [duration *DURATION*] *METRICs*
     Profile *METRICs* for bpf program *PROG* for *DURATION* seconds or until
     user hits <Ctrl+C>. *DURATION* is optional. If *DURATION* is not specified,
-    the profiling will run up to **UINT_MAX** seconds.
+    the profiling will run up to **UINT_MAX** seconds. When **cycles** is
+    selected, plain output also reports the average number of cycles per
+    program run.
 
 bpftool prog help
     Print short help message.
@@ -360,7 +362,7 @@ EXAMPLES
 ::
 
          51397 run_cnt
-      40176203 cycles                                                 (83.05%)
+      40176203 cycles          # 781.68 cycles per run                (83.05%)
       42518139 instructions    #   1.06 insns per cycle               (83.39%)
            123 llc_misses      #   2.89 LLC misses per million insns  (83.15%)
 
diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c
index a9f730d407a92..8935508f955b1 100644
--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -2069,9 +2069,9 @@ struct profile_metric {
 	bool selected;
 
 	/* calculate ratios like instructions per cycle */
-	const int ratio_metric; /* 0 for N/A, 1 for index 0 (cycles) */
+	const int ratio_metric; /* 0 for run_cnt, 1 for index 0 (cycles) */
 	const char *ratio_desc;
-	const float ratio_mul;
+	const double ratio_mul;
 } metrics[] = {
 	{
 		.name = "cycles",
@@ -2080,6 +2080,9 @@ struct profile_metric {
 			.config = PERF_COUNT_HW_CPU_CYCLES,
 			.exclude_user = 1,
 		},
+		.ratio_metric = 0,
+		.ratio_desc = "cycles per run",
+		.ratio_mul = 1.0,
 	},
 	{
 		.name = "instructions",
@@ -2256,17 +2259,18 @@ static void profile_print_readings_plain(void)
 	for (m = 0; m < ARRAY_SIZE(metrics); m++) {
 		struct bpf_perf_event_value *val = &metrics[m].val;
 		int r;
+		__u64 ratio;
 
 		if (!metrics[m].selected)
 			continue;
 		printf("%18llu %-20s", val->counter, metrics[m].name);
 
-		r = metrics[m].ratio_metric - 1;
-		if (r >= 0 && metrics[r].selected &&
-		    metrics[r].val.counter > 0) {
+		r = metrics[m].ratio_metric;
+		/* r == 0 is a special case for run_cnt */
+		ratio = r ? metrics[r - 1].val.counter : profile_total_count;
+		if (metrics[m].ratio_desc && ratio) {
 			printf("# %8.2f %-30s",
-			       val->counter * metrics[m].ratio_mul /
-			       metrics[r].val.counter,
+			       val->counter * metrics[m].ratio_mul / ratio,
 			       metrics[m].ratio_desc);
 		} else {
 			printf("%-41s", "");

3/2 2026/08/27 16:41 llm patch-evaluator
0m Model: 
gemini-3.1-pro-preview

Args: 
null

Results: 
null

Tokens: 
							input: 2931
							output: 58
							thoughts: 218

Thoughts: 
**WorthFuzzing=False: Analysis of bpftool Patch**

Okay, so I've got this patch affecting `tools/bpf/bpftool/prog.c` and `tools/bpf/bpftool/Documentation/bpftool-prog.rst`. Right away, my expert intuition tells me this is userspace code – `bpftool`, specifically. Now, the prompt states pretty clearly that I need to return `WorthFuzzing=false` if the patch *only* touches documentation, Kconfig files, decorative changes, or unreachable code in a virtualized environment.

My initial thought is that `tools/` is definitely userspace. And my understanding is that Syzkaller, in general, targets kernel code for fuzzing, not userspace utilities like `bpftool`, unless there's a very specific reason. Let me clarify, `bpftool` isn't a typical target for syzkaller directly; it's just a tool.

Alright, let's confirm the scope. I see the listed files are the only ones touched: `tools/bpf/bpftool/prog.c` and `tools/bpf/bpftool/Documentation/bpftool-prog.rst`. No kernel changes. Therefore, based on the prompt's criteria and my understanding of the system, this patch absolutely does *not* warrant Syzkaller fuzzing.

**Conclusion: WorthFuzzing=false.**

4/2 2026/08/27 16:41 tool set-results
0m Args: 
{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies the userspace bpftool utility and its documentation. It does not make any functional changes to the kernel code.",
  "WorthFuzzing": false
}

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies the userspace bpftool utility and its documentation. It does not make any functional changes to the kernel code.",
  "WorthFuzzing": false
}
5/1 2026/08/27 16:41 action If
0m 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)