AI Trajectory

Trajectory: (Expand/Collapse All)
Seq	Timestamp	Type	Name	Duration
0/0	2026/07/11 10:23	flow	patch-triage	0m Args: null Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch only modifies a tracepoint definition (TP_printk in TRACE_EVENT for kvm_inj_exception), which is a purely decorative change.", "WorthFuzzing": false }
1/1	2026/07/11 10:23	action	read-patch-diff	0m Args: null Results: { "PatchDiff": "commit f3a0e3094145d4597814b5bb7991c5dced5b9061\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Sat Jul 11 10:23:06 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h\nindex 0db25bba17f6e8..93de876c318ce5 100644\n--- a/arch/x86/kvm/trace.h\n+++ b/arch/x86/kvm/trace.h\n@@ -490,7 +490,7 @@ TRACE_EVENT(kvm_inj_exception,\n \tTP_printk(\"%s%s%s%s%s\",\n \t\t __print_symbolic(__entry-\u003eexception, kvm_trace_sym_exc),\n \t\t !__entry-\u003ehas_error ? \"\" : \" (\",\n-\t\t !__entry-\u003ehas_error ? \"\" : __print_symbolic(__entry-\u003eerror_code, { }),\n+\t\t !__entry-\u003ehas_error ? \"\" : __print_symbolic(__entry-\u003eerror_code),\n \t\t !__entry-\u003ehas_error ? \"\" : \")\",\n \t\t __entry-\u003ereinjected ? \" [reinjected]\" : \"\")\n );\n" }
2/1	2026/07/11 10:23	agent	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch only modifies a tracepoint definition (TP_printk in TRACE_EVENT for kvm_inj_exception), which is a purely decorative change.", "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 f3a0e3094145d4597814b5bb7991c5dced5b9061 Author: syz-cluster <triage@syzkaller.com> Date: Sat Jul 11 10:23:06 2026 +0000 syz-cluster: applied patch under review diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h index 0db25bba17f6e8..93de876c318ce5 100644 --- a/arch/x86/kvm/trace.h +++ b/arch/x86/kvm/trace.h @@ -490,7 +490,7 @@ TRACE_EVENT(kvm_inj_exception, TP_printk("%s%s%s%s%s", __print_symbolic(__entry->exception, kvm_trace_sym_exc), !__entry->has_error ? "" : " (", - !__entry->has_error ? "" : __print_symbolic(__entry->error_code, { }), + !__entry->has_error ? "" : __print_symbolic(__entry->error_code), !__entry->has_error ? "" : ")", __entry->reinjected ? " [reinjected]" : "") );
3/2	2026/07/11 10:23	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 1896 output: 63 thoughts: 945 Thoughts: Analyzing the Patch: KVM Tracepoint Modification Okay, so I'm looking at this patch and my initial thought is, "Hmm, it's touching `arch/x86/kvm/trace.h`." Specifically, it's modifying the `TRACE_EVENT(kvm_inj_exception, ...)` macro. My immediate concern is this change: `__print_symbolic(__entry->error_code, { })` is becoming `__print_symbolic(__entry->error_code)`. That looks wrong at first glance. `__print_symbolic` should have two arguments: the value and the symbol array, but the patch seems to have removed the second one. Let's dive into the context. The patch shows: ```c - !__entry->has_error ? "" : __print_symbolic(__entry->error_code, { }), + !__entry->has_error ? "" : __print_symbolic(__entry->error_code), ``` Okay, that's exactly what I saw. My first inclination is that this is a typo. But, wait, let's keep going. The instructions say that if a patch contains only modifications to documentation, Kconfig, or code comments, or purely decorative changes like logging or tracepoints, then I should set `WorthFuzzing=false`. This modification is happening within a `TRACE_EVENT` macro which is by definition a tracepoint. I should investigate it further to be sure. Looking closer, I can see the change is within `TP_printk` of the `TRACE_EVENT`. ```diff --- a/arch/x86/kvm/trace.h +++ b/arch/x86/kvm/trace.h @@ -490,7 +490,7 @@ TRACE_EVENT(kvm_inj_exception, TP_printk("%s%s%s%s%s", __print_symbolic(__entry->exception, kvm_trace_sym_exc), !__entry->has_error ? "" : " (", - !__entry->has_error ? "" : __print_symbolic(__entry->error_code, { }), + !__entry->has_error ? "" : __print_symbolic(__entry->error_code), !__entry->has_error ? "" : ")", __entry->reinjected ? " [reinjected]" : "") ); ``` Let's verify there are no other changes. No, just this one line inside the tracepoint. The `__print_symbolic` change is the only modification in this file. It's inside `TP_printk`. So it seems to be solely a change to the tracepoint's output, and therefore a purely decorative change to the tracepoint, therefore non-interesting for fuzzing. Despite what appears to be a syntax error in the patch, my conclusion is that this is a tracepoint change. So, I'm going to set `WorthFuzzing=false`.
4/2	2026/07/11 10:23	tool	set-results	0m Args: { "EnableConfigs": [], "FocusSymbols": [], "Reasoning": "The patch only modifies a tracepoint definition (TP_printk in TRACE_EVENT for kvm_inj_exception), which is a purely decorative change.", "WorthFuzzing": false } Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch only modifies a tracepoint definition (TP_printk in TRACE_EVENT for kvm_inj_exception), which is a purely decorative change.", "WorthFuzzing": false }

Trajectory: (Expand/Collapse All)

Seq

Timestamp

Type

Name

Duration

0/0

2026/07/11 10:23

flow

patch-triage

Args:

null

Results:

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies a tracepoint definition (TP_printk in TRACE_EVENT for kvm_inj_exception), which is a purely decorative change.",
  "WorthFuzzing": false
}

1/1

2026/07/11 10:23

action

read-patch-diff

Args:

null

Results:

{
  "PatchDiff": "commit f3a0e3094145d4597814b5bb7991c5dced5b9061\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Sat Jul 11 10:23:06 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h\nindex 0db25bba17f6e8..93de876c318ce5 100644\n--- a/arch/x86/kvm/trace.h\n+++ b/arch/x86/kvm/trace.h\n@@ -490,7 +490,7 @@ TRACE_EVENT(kvm_inj_exception,\n \tTP_printk(\"%s%s%s%s%s\",\n \t\t  __print_symbolic(__entry-\u003eexception, kvm_trace_sym_exc),\n \t\t  !__entry-\u003ehas_error ? \"\" : \" (\",\n-\t\t  !__entry-\u003ehas_error ? \"\" : __print_symbolic(__entry-\u003eerror_code, { }),\n+\t\t  !__entry-\u003ehas_error ? \"\" : __print_symbolic(__entry-\u003eerror_code),\n \t\t  !__entry-\u003ehas_error ? \"\" : \")\",\n \t\t  __entry-\u003ereinjected ? \" [reinjected]\" : \"\")\n );\n"
}

2/1

2026/07/11 10:23

agent

patch-evaluator

Model:

gemini-3.1-pro-preview

Args:

null

Results:

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies a tracepoint definition (TP_printk in TRACE_EVENT for kvm_inj_exception), which is a purely decorative change.",
  "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 f3a0e3094145d4597814b5bb7991c5dced5b9061
Author: syz-cluster <triage@syzkaller.com>
Date:   Sat Jul 11 10:23:06 2026 +0000

    syz-cluster: applied patch under review

diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index 0db25bba17f6e8..93de876c318ce5 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -490,7 +490,7 @@ TRACE_EVENT(kvm_inj_exception,
 	TP_printk("%s%s%s%s%s",
 		  __print_symbolic(__entry->exception, kvm_trace_sym_exc),
 		  !__entry->has_error ? "" : " (",
-		  !__entry->has_error ? "" : __print_symbolic(__entry->error_code, { }),
+		  !__entry->has_error ? "" : __print_symbolic(__entry->error_code),
 		  !__entry->has_error ? "" : ")",
 		  __entry->reinjected ? " [reinjected]" : "")
 );

3/2

2026/07/11 10:23

llm

patch-evaluator

Model:

gemini-3.1-pro-preview

Args:

null

Results:

null

Tokens:

							input: 1896
							output: 63
							thoughts: 945

Thoughts:

**Analyzing the Patch: KVM Tracepoint Modification**

Okay, so I'm looking at this patch and my initial thought is, "Hmm, it's touching `arch/x86/kvm/trace.h`." Specifically, it's modifying the `TRACE_EVENT(kvm_inj_exception, ...)` macro. My immediate concern is this change: `__print_symbolic(__entry->error_code, { })` is becoming `__print_symbolic(__entry->error_code)`. That looks *wrong* at first glance. `__print_symbolic` should have two arguments: the value and the symbol array, but the patch seems to have removed the second one.

Let's dive into the context. The patch shows:
```c
-		  !__entry->has_error ? "" : __print_symbolic(__entry->error_code, { }),
+		  !__entry->has_error ? "" : __print_symbolic(__entry->error_code),
```
Okay, that's exactly what I saw. My first inclination is that this is a typo. But, wait, let's keep going.

The instructions say that if a patch contains *only* modifications to documentation, Kconfig, or code comments, or purely decorative changes like logging or tracepoints, then I should set `WorthFuzzing=false`. This modification *is* happening within a `TRACE_EVENT` macro which is by definition a tracepoint. I should investigate it further to be sure.

Looking closer, I can see the change is within `TP_printk` of the `TRACE_EVENT`.

```diff
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -490,7 +490,7 @@ TRACE_EVENT(kvm_inj_exception,
 	TP_printk("%s%s%s%s%s",
 		  __print_symbolic(__entry->exception, kvm_trace_sym_exc),
 		  !__entry->has_error ? "" : " (",
-		  !__entry->has_error ? "" : __print_symbolic(__entry->error_code, { }),
+		  !__entry->has_error ? "" : __print_symbolic(__entry->error_code),
 		  !__entry->has_error ? "" : ")",
 		  __entry->reinjected ? " [reinjected]" : "")
 );
```

Let's verify there are no other changes. No, just this one line inside the tracepoint. The `__print_symbolic` change is the only modification in this file. It's inside `TP_printk`. So it seems to be solely a change to the tracepoint's output, and therefore a purely decorative change to the tracepoint, therefore non-interesting for fuzzing. Despite what *appears* to be a syntax error in the patch, my conclusion is that this is a tracepoint change.

So, I'm going to set `WorthFuzzing=false`.

4/2

2026/07/11 10:23

tool

set-results

Args:

{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies a tracepoint definition (TP_printk in TRACE_EVENT for kvm_inj_exception), which is a purely decorative change.",
  "WorthFuzzing": false
}

Results:

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies a tracepoint definition (TP_printk in TRACE_EVENT for kvm_inj_exception), which is a purely decorative change.",
  "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)