AI Trajectory


Trajectory: (Expand/Collapse All)
Seq Timestamp Type Name Duration
0/0 2026/07/11 15:59 flow patch-triage
0m Args: 
null

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only moves a variable declaration into a narrower scope to fix a compiler warning or clean up the code. It does not make any functional changes to the kernel.",
  "WorthFuzzing": false
}
1/1 2026/07/11 15:59 action read-patch-diff
0m Args: 
null

Results: 
{
  "PatchDiff": "commit d247925cb4624d33d49860878991aae4794169f2\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Sat Jul 11 15:59:51 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/net/core/filter.c b/net/core/filter.c\nindex e4697036c67b53..056deb9b3fc354 100644\n--- a/net/core/filter.c\n+++ b/net/core/filter.c\n@@ -12575,7 +12575,6 @@ __bpf_kfunc int bpf_xdp_pull_data(struct xdp_md *x, u32 len)\n __bpf_kfunc int bpf_icmp_send(struct __sk_buff *skb_ctx, int type, int code)\n {\n \tstruct sk_buff *skb = (struct sk_buff *)skb_ctx;\n-\tstruct sk_buff *nskb;\n \tstruct sock *sk;\n \n \tsk = skb_to_full_sk(skb);\n@@ -12589,6 +12588,8 @@ __bpf_kfunc int bpf_icmp_send(struct __sk_buff *skb_ctx, int type, int code)\n \tswitch (skb-\u003eprotocol) {\n #if IS_ENABLED(CONFIG_INET)\n \tcase htons(ETH_P_IP): {\n+\t\tstruct sk_buff *nskb;\n+\n \t\tif (type != ICMP_DEST_UNREACH)\n \t\t\treturn -EOPNOTSUPP;\n \t\tif (code \u003c 0 || code \u003e NR_ICMP_UNREACH ||\n@@ -12606,7 +12607,9 @@ __bpf_kfunc int bpf_icmp_send(struct __sk_buff *skb_ctx, int type, int code)\n \t}\n #endif\n #if IS_ENABLED(CONFIG_IPV6)\n-\tcase htons(ETH_P_IPV6):\n+\tcase htons(ETH_P_IPV6): {\n+\t\tstruct sk_buff *nskb;\n+\n \t\tif (type != ICMPV6_DEST_UNREACH)\n \t\t\treturn -EOPNOTSUPP;\n \t\tif (code \u003c 0 || code \u003e ICMPV6_REJECT_ROUTE)\n@@ -12620,6 +12623,7 @@ __bpf_kfunc int bpf_icmp_send(struct __sk_buff *skb_ctx, int type, int code)\n \t\ticmpv6_send(nskb, type, code, 0);\n \t\tconsume_skb(nskb);\n \t\tbreak;\n+\t}\n #endif\n \tdefault:\n \t\treturn -EPROTONOSUPPORT;\n"
}
2/1 2026/07/11 15:59 agent patch-evaluator
0m Model: 
gemini-3.1-pro-preview

Args: 
null

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only moves a variable declaration into a narrower scope to fix a compiler warning or clean up the code. It does not make any functional changes to the kernel.",
  "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 d247925cb4624d33d49860878991aae4794169f2
Author: syz-cluster <triage@syzkaller.com>
Date:   Sat Jul 11 15:59:51 2026 +0000

    syz-cluster: applied patch under review

diff --git a/net/core/filter.c b/net/core/filter.c
index e4697036c67b53..056deb9b3fc354 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -12575,7 +12575,6 @@ __bpf_kfunc int bpf_xdp_pull_data(struct xdp_md *x, u32 len)
 __bpf_kfunc int bpf_icmp_send(struct __sk_buff *skb_ctx, int type, int code)
 {
 	struct sk_buff *skb = (struct sk_buff *)skb_ctx;
-	struct sk_buff *nskb;
 	struct sock *sk;
 
 	sk = skb_to_full_sk(skb);
@@ -12589,6 +12588,8 @@ __bpf_kfunc int bpf_icmp_send(struct __sk_buff *skb_ctx, int type, int code)
 	switch (skb->protocol) {
 #if IS_ENABLED(CONFIG_INET)
 	case htons(ETH_P_IP): {
+		struct sk_buff *nskb;
+
 		if (type != ICMP_DEST_UNREACH)
 			return -EOPNOTSUPP;
 		if (code < 0 || code > NR_ICMP_UNREACH ||
@@ -12606,7 +12607,9 @@ __bpf_kfunc int bpf_icmp_send(struct __sk_buff *skb_ctx, int type, int code)
 	}
 #endif
 #if IS_ENABLED(CONFIG_IPV6)
-	case htons(ETH_P_IPV6):
+	case htons(ETH_P_IPV6): {
+		struct sk_buff *nskb;
+
 		if (type != ICMPV6_DEST_UNREACH)
 			return -EOPNOTSUPP;
 		if (code < 0 || code > ICMPV6_REJECT_ROUTE)
@@ -12620,6 +12623,7 @@ __bpf_kfunc int bpf_icmp_send(struct __sk_buff *skb_ctx, int type, int code)
 		icmpv6_send(nskb, type, code, 0);
 		consume_skb(nskb);
 		break;
+	}
 #endif
 	default:
 		return -EPROTONOSUPPORT;

3/2 2026/07/11 15:59 llm patch-evaluator
0m Model: 
gemini-3.1-pro-preview

Args: 
null

Results: 
null

Tokens: 
							input: 2261
							output: 64
							thoughts: 755

Thoughts: 
**Analyzing a Minor Kernel Patch**

Okay, so I'm looking at this patch that touches `net/core/filter.c`. My initial thought is, "Ah, just a stylistic adjustment." It looks like they're moving the declaration of `struct sk_buff *nskb;` inside the `case` blocks for `ETH_P_IP` and `ETH_P_IPV6`. It's a scope change, plain and simple.

The reasoning is likely to avoid compiler warnings about an unused variable when either `CONFIG_INET` or `CONFIG_IPV6` is disabled. That makes sense; if neither is enabled, `nskb` would be declared but never used, triggering a warning. This feels like good housekeeping. It's about cleaner code.

I need to confirm this visually. Let me check the diff itself. Ah yes, exactly as I suspected. There's no modification of the program flow. The code's logic is untouched. It's all about refactoring to silence a warning.

Looking at the code, it’s a straightforward move. No function is being changed; just variable declaration scope.

So, given the nature of the change, it's a non-functional refactoring. No risk of new bugs. I'm going to set `WorthFuzzing=false`.

4/2 2026/07/11 16:00 tool set-results
0m Args: 
{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch only moves a variable declaration into a narrower scope to fix a compiler warning or clean up the code. It does not make any functional changes to the kernel.",
  "WorthFuzzing": false
}

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only moves a variable declaration into a narrower scope to fix a compiler warning or clean up the code. It does not make any functional changes to the kernel.",
  "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)