AI Trajectory


Trajectory: (Expand/Collapse All)
Seq Timestamp Type Name Duration
0/0 2026/06/23 02:18 flow patch-triage
0m Args: 
null

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies BPF selftests (tools/testing/selftests/bpf/) and does not contain any functional changes to the kernel code itself.",
  "WorthFuzzing": false
}
1/1 2026/06/23 02:18 action read-patch-diff
0m Args: 
null

Results: 
{
  "PatchDiff": "commit e96bda7ba7f50ad8f2f9361d8415ace83daf0943\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Tue Jun 23 02:18:36 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/tools/testing/selftests/bpf/prog_tests/prog_run_opts.c b/tools/testing/selftests/bpf/prog_tests/prog_run_opts.c\nindex 01f1d1b6715a6c..beb6fa78fd949f 100644\n--- a/tools/testing/selftests/bpf/prog_tests/prog_run_opts.c\n+++ b/tools/testing/selftests/bpf/prog_tests/prog_run_opts.c\n@@ -4,6 +4,10 @@\n \n #include \"test_pkt_access.skel.h\"\n \n+#define NONLINEAR_PKT_LEN 9000\n+#define NONLINEAR_LINEAR_DATA_LEN 64\n+#define SHORT_OUT_LEN 100\n+\n static const __u32 duration;\n \n static void check_run_cnt(int prog_fd, __u64 run_cnt)\n@@ -20,6 +24,69 @@ static void check_run_cnt(int prog_fd, __u64 run_cnt)\n \t      \"incorrect number of repetitions, want %llu have %llu\\n\", run_cnt, info.run_cnt);\n }\n \n+static void init_pkt(__u8 *pkt, size_t len)\n+{\n+\tsize_t i;\n+\n+\tfor (i = 0; i \u003c len; i++)\n+\t\tpkt[i] = i \u0026 0xff;\n+}\n+\n+static void test_skb_nonlinear_data_out_partial(struct test_pkt_access *skel)\n+{\n+\tLIBBPF_OPTS(bpf_test_run_opts, topts);\n+\t__u8 pkt[NONLINEAR_PKT_LEN];\n+\t__u8 out[SHORT_OUT_LEN] = {};\n+\tstruct __sk_buff skb = {};\n+\tint prog_fd, err;\n+\n+\tinit_pkt(pkt, sizeof(pkt));\n+\n+\tskb.data_end = NONLINEAR_LINEAR_DATA_LEN;\n+\n+\ttopts.data_in = pkt;\n+\ttopts.data_size_in = sizeof(pkt);\n+\ttopts.data_out = out;\n+\ttopts.data_size_out = sizeof(out);\n+\ttopts.ctx_in = \u0026skb;\n+\ttopts.ctx_size_in = sizeof(skb);\n+\n+\tprog_fd = bpf_program__fd(skel-\u003eprogs.tc_pass_prog);\n+\terr = bpf_prog_test_run_opts(prog_fd, \u0026topts);\n+\n+\tASSERT_EQ(err, -ENOSPC, \"skb_partial_err\");\n+\tASSERT_EQ(topts.data_size_out, sizeof(pkt), \"skb_partial_size\");\n+\tASSERT_OK(memcmp(out, pkt, sizeof(out)), \"skb_partial_data\");\n+}\n+\n+static void test_xdp_nonlinear_data_out_partial(struct test_pkt_access *skel)\n+{\n+\tLIBBPF_OPTS(bpf_test_run_opts, topts);\n+\t__u8 pkt[NONLINEAR_PKT_LEN];\n+\t__u8 out[SHORT_OUT_LEN] = {};\n+\tstruct xdp_md ctx = {};\n+\tint prog_fd, err;\n+\n+\tinit_pkt(pkt, sizeof(pkt));\n+\n+\tctx.data = 0;\n+\tctx.data_end = NONLINEAR_LINEAR_DATA_LEN;\n+\n+\ttopts.data_in = pkt;\n+\ttopts.data_size_in = sizeof(pkt);\n+\ttopts.data_out = out;\n+\ttopts.data_size_out = sizeof(out);\n+\ttopts.ctx_in = \u0026ctx;\n+\ttopts.ctx_size_in = sizeof(ctx);\n+\n+\tprog_fd = bpf_program__fd(skel-\u003eprogs.xdp_frags_pass_prog);\n+\terr = bpf_prog_test_run_opts(prog_fd, \u0026topts);\n+\n+\tASSERT_EQ(err, -ENOSPC, \"xdp_partial_err\");\n+\tASSERT_EQ(topts.data_size_out, sizeof(pkt), \"xdp_partial_size\");\n+\tASSERT_OK(memcmp(out, pkt, sizeof(out)), \"xdp_partial_data\");\n+}\n+\n void test_prog_run_opts(void)\n {\n \tstruct test_pkt_access *skel;\n@@ -69,6 +136,9 @@ void test_prog_run_opts(void)\n \trun_cnt += topts.repeat;\n \tcheck_run_cnt(prog_fd, run_cnt);\n \n+\ttest_skb_nonlinear_data_out_partial(skel);\n+\ttest_xdp_nonlinear_data_out_partial(skel);\n+\n cleanup:\n \tif (skel)\n \t\ttest_pkt_access__destroy(skel);\ndiff --git a/tools/testing/selftests/bpf/progs/test_pkt_access.c b/tools/testing/selftests/bpf/progs/test_pkt_access.c\nindex bce7173152c6c4..cd284401eebdbb 100644\n--- a/tools/testing/selftests/bpf/progs/test_pkt_access.c\n+++ b/tools/testing/selftests/bpf/progs/test_pkt_access.c\n@@ -150,3 +150,15 @@ int test_pkt_access(struct __sk_buff *skb)\n \n \treturn TC_ACT_UNSPEC;\n }\n+\n+SEC(\"tc\")\n+int tc_pass_prog(struct __sk_buff *skb)\n+{\n+\treturn TC_ACT_OK;\n+}\n+\n+SEC(\"xdp.frags\")\n+int xdp_frags_pass_prog(struct xdp_md *ctx)\n+{\n+\treturn XDP_PASS;\n+}\n"
}
2/1 2026/06/23 02:18 agent patch-evaluator
0m Model: 
gemini-3.1-pro-preview

Args: 
null

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies BPF selftests (tools/testing/selftests/bpf/) and does not contain any functional changes to the kernel code itself.",
  "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 e96bda7ba7f50ad8f2f9361d8415ace83daf0943
Author: syz-cluster <triage@syzkaller.com>
Date:   Tue Jun 23 02:18:36 2026 +0000

    syz-cluster: applied patch under review

diff --git a/tools/testing/selftests/bpf/prog_tests/prog_run_opts.c b/tools/testing/selftests/bpf/prog_tests/prog_run_opts.c
index 01f1d1b6715a6c..beb6fa78fd949f 100644
--- a/tools/testing/selftests/bpf/prog_tests/prog_run_opts.c
+++ b/tools/testing/selftests/bpf/prog_tests/prog_run_opts.c
@@ -4,6 +4,10 @@
 
 #include "test_pkt_access.skel.h"
 
+#define NONLINEAR_PKT_LEN 9000
+#define NONLINEAR_LINEAR_DATA_LEN 64
+#define SHORT_OUT_LEN 100
+
 static const __u32 duration;
 
 static void check_run_cnt(int prog_fd, __u64 run_cnt)
@@ -20,6 +24,69 @@ static void check_run_cnt(int prog_fd, __u64 run_cnt)
 	      "incorrect number of repetitions, want %llu have %llu\n", run_cnt, info.run_cnt);
 }
 
+static void init_pkt(__u8 *pkt, size_t len)
+{
+	size_t i;
+
+	for (i = 0; i < len; i++)
+		pkt[i] = i & 0xff;
+}
+
+static void test_skb_nonlinear_data_out_partial(struct test_pkt_access *skel)
+{
+	LIBBPF_OPTS(bpf_test_run_opts, topts);
+	__u8 pkt[NONLINEAR_PKT_LEN];
+	__u8 out[SHORT_OUT_LEN] = {};
+	struct __sk_buff skb = {};
+	int prog_fd, err;
+
+	init_pkt(pkt, sizeof(pkt));
+
+	skb.data_end = NONLINEAR_LINEAR_DATA_LEN;
+
+	topts.data_in = pkt;
+	topts.data_size_in = sizeof(pkt);
+	topts.data_out = out;
+	topts.data_size_out = sizeof(out);
+	topts.ctx_in = &skb;
+	topts.ctx_size_in = sizeof(skb);
+
+	prog_fd = bpf_program__fd(skel->progs.tc_pass_prog);
+	err = bpf_prog_test_run_opts(prog_fd, &topts);
+
+	ASSERT_EQ(err, -ENOSPC, "skb_partial_err");
+	ASSERT_EQ(topts.data_size_out, sizeof(pkt), "skb_partial_size");
+	ASSERT_OK(memcmp(out, pkt, sizeof(out)), "skb_partial_data");
+}
+
+static void test_xdp_nonlinear_data_out_partial(struct test_pkt_access *skel)
+{
+	LIBBPF_OPTS(bpf_test_run_opts, topts);
+	__u8 pkt[NONLINEAR_PKT_LEN];
+	__u8 out[SHORT_OUT_LEN] = {};
+	struct xdp_md ctx = {};
+	int prog_fd, err;
+
+	init_pkt(pkt, sizeof(pkt));
+
+	ctx.data = 0;
+	ctx.data_end = NONLINEAR_LINEAR_DATA_LEN;
+
+	topts.data_in = pkt;
+	topts.data_size_in = sizeof(pkt);
+	topts.data_out = out;
+	topts.data_size_out = sizeof(out);
+	topts.ctx_in = &ctx;
+	topts.ctx_size_in = sizeof(ctx);
+
+	prog_fd = bpf_program__fd(skel->progs.xdp_frags_pass_prog);
+	err = bpf_prog_test_run_opts(prog_fd, &topts);
+
+	ASSERT_EQ(err, -ENOSPC, "xdp_partial_err");
+	ASSERT_EQ(topts.data_size_out, sizeof(pkt), "xdp_partial_size");
+	ASSERT_OK(memcmp(out, pkt, sizeof(out)), "xdp_partial_data");
+}
+
 void test_prog_run_opts(void)
 {
 	struct test_pkt_access *skel;
@@ -69,6 +136,9 @@ void test_prog_run_opts(void)
 	run_cnt += topts.repeat;
 	check_run_cnt(prog_fd, run_cnt);
 
+	test_skb_nonlinear_data_out_partial(skel);
+	test_xdp_nonlinear_data_out_partial(skel);
+
 cleanup:
 	if (skel)
 		test_pkt_access__destroy(skel);
diff --git a/tools/testing/selftests/bpf/progs/test_pkt_access.c b/tools/testing/selftests/bpf/progs/test_pkt_access.c
index bce7173152c6c4..cd284401eebdbb 100644
--- a/tools/testing/selftests/bpf/progs/test_pkt_access.c
+++ b/tools/testing/selftests/bpf/progs/test_pkt_access.c
@@ -150,3 +150,15 @@ int test_pkt_access(struct __sk_buff *skb)
 
 	return TC_ACT_UNSPEC;
 }
+
+SEC("tc")
+int tc_pass_prog(struct __sk_buff *skb)
+{
+	return TC_ACT_OK;
+}
+
+SEC("xdp.frags")
+int xdp_frags_pass_prog(struct xdp_md *ctx)
+{
+	return XDP_PASS;
+}

3/2 2026/06/23 02:18 llm patch-evaluator
0m Model: 
gemini-3.1-pro-preview

Args: 
null

Results: 
null

Tokens: 
							input: 3153
							output: 65
							thoughts: 112

Thoughts: 
**WorthFuzzing=False: Analysis of BPF Selftest Patch**

Okay, let's break this down. This patch is touching files within `tools/testing/selftests/bpf/`. Specifically, I'm seeing changes to `prog_run_opts.c` and `test_pkt_access.c`. These are, quite clearly, selftests. They're part of the testing infrastructure, not the core kernel code itself. They're there to validate the behavior of the BPF subsystem, but *not* to make actual changes to the running kernel functionality.

Given this, I have to conclude that this patch doesn't introduce any new functionality or modifications to the kernel's critical execution paths that would warrant fuzzing. The changes are confined to the testing environment. Consequently, I'll be setting `WorthFuzzing=false`. No fuzzing is required for this particular patch. It's a test case, not a functional modification.

4/2 2026/06/23 02:18 tool set-results
0m Args: 
{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies BPF selftests (tools/testing/selftests/bpf/) and does not contain any functional changes to the kernel code itself.",
  "WorthFuzzing": false
}

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies BPF selftests (tools/testing/selftests/bpf/) and does not contain any functional changes to the kernel code itself.",
  "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)