AI Trajectory

Trajectory: (Expand/Collapse All)
Seq	Timestamp	Type	Name	Duration
0/0	2026/07/02 02:23	flow	patch-triage	0m Args: null Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch only modifies user-space selftests (tools/testing/selftests/mm/uffd-common.c) and does not make any functional changes to the kernel code itself.", "WorthFuzzing": false }
1/1	2026/07/02 02:23	action	read-patch-diff	0m Args: null Results: { "PatchDiff": "commit 54c18cd2e3360cc091638cd71236c15ddfdf2828\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Thu Jul 2 02:23:14 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/tools/testing/selftests/mm/uffd-common.c b/tools/testing/selftests/mm/uffd-common.c\nindex edd02328f77ba1..f48f5d4594ab00 100644\n--- a/tools/testing/selftests/mm/uffd-common.c\n+++ b/tools/testing/selftests/mm/uffd-common.c\n@@ -639,8 +639,13 @@ int __copy_page(uffd_global_test_opts_t gopts, unsigned long offset, bool retry\n \t\tuffdio_copy.mode = 0;\n \tuffdio_copy.copy = 0;\n \tif (ioctl(gopts-\u003euffd, UFFDIO_COPY, \u0026uffdio_copy)) {\n-\t\t/ real retval in ufdio_copy.copy /\n-\t\tif (uffdio_copy.copy != -EEXIST)\n+\t\t/\n+\t\t * real retval in uffdio_copy.copy\n+\t\t \n+\t\t -EEXIST: the page was faulted in concurrently\n+\t\t * -ENOENT: the destination range was concurrently removed\n+\t\t */\n+\t\tif (uffdio_copy.copy != -EEXIST \u0026\u0026 uffdio_copy.copy != -ENOENT)\n \t\t\terr(\"UFFDIO_COPY error: %\"PRId64,\n \t\t\t (int64_t)uffdio_copy.copy);\n \t\twake_range(gopts-\u003euffd, uffdio_copy.dst, gopts-\u003epage_size);\n" }
2/1	2026/07/02 02:23	agent	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch only modifies user-space selftests (tools/testing/selftests/mm/uffd-common.c) and does not make 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 54c18cd2e3360cc091638cd71236c15ddfdf2828 Author: syz-cluster <triage@syzkaller.com> Date: Thu Jul 2 02:23:14 2026 +0000 syz-cluster: applied patch under review diff --git a/tools/testing/selftests/mm/uffd-common.c b/tools/testing/selftests/mm/uffd-common.c index edd02328f77ba1..f48f5d4594ab00 100644 --- a/tools/testing/selftests/mm/uffd-common.c +++ b/tools/testing/selftests/mm/uffd-common.c @@ -639,8 +639,13 @@ int __copy_page(uffd_global_test_opts_t gopts, unsigned long offset, bool retry uffdio_copy.mode = 0; uffdio_copy.copy = 0; if (ioctl(gopts->uffd, UFFDIO_COPY, &uffdio_copy)) { - / real retval in ufdio_copy.copy / - if (uffdio_copy.copy != -EEXIST) + / + * real retval in uffdio_copy.copy + * + * -EEXIST: the page was faulted in concurrently + * -ENOENT: the destination range was concurrently removed + */ + if (uffdio_copy.copy != -EEXIST && uffdio_copy.copy != -ENOENT) err("UFFDIO_COPY error: %"PRId64, (int64_t)uffdio_copy.copy); wake_range(gopts->uffd, uffdio_copy.dst, gopts->page_size);
3/2	2026/07/02 02:23	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 2008 output: 72 thoughts: 195 Thoughts: WorthFuzzing=false: A Quick Analysis Okay, let's break this down. The patch focuses on modifying a selftest file: specifically, `tools/testing/selftests/mm/uffd-common.c`. I immediately key in on the "selftests" directory. That's a huge clue. This change is not occurring within the kernel itself. It's user-space testing code. It's manipulating the conditions within the `__copy_page` function, and adding `-ENOENT` to ignored errors, but all within a testing context. Since this patch is making changes in user space only, the functionality of the kernel isn't being altered. It doesn't present any new code that needs to be fuzzed from a kernel perspective. Therefore, I'm confident in setting `WorthFuzzing=false`. Just to be sure, I will double-check that the file location confirms my initial assessment. Yes, confirmed. `tools/testing/selftests/` is indeed in userspace. I'll make the call, and report `WorthFuzzing=false`.
4/2	2026/07/02 02:23	tool	set-results	0m Args: { "EnableConfigs": [], "FocusSymbols": [], "Reasoning": "The patch only modifies user-space selftests (tools/testing/selftests/mm/uffd-common.c) and does not make any functional changes to the kernel code itself.", "WorthFuzzing": false } Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch only modifies user-space selftests (tools/testing/selftests/mm/uffd-common.c) and does not make any functional changes to the kernel code itself.", "WorthFuzzing": false }

Trajectory: (Expand/Collapse All)

Seq

Timestamp

Type

Name

Duration

0/0

2026/07/02 02:23

flow

patch-triage

Args:

null

Results:

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies user-space selftests (tools/testing/selftests/mm/uffd-common.c) and does not make any functional changes to the kernel code itself.",
  "WorthFuzzing": false
}

1/1

2026/07/02 02:23

action

read-patch-diff

Args:

null

Results:

{
  "PatchDiff": "commit 54c18cd2e3360cc091638cd71236c15ddfdf2828\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Thu Jul 2 02:23:14 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/tools/testing/selftests/mm/uffd-common.c b/tools/testing/selftests/mm/uffd-common.c\nindex edd02328f77ba1..f48f5d4594ab00 100644\n--- a/tools/testing/selftests/mm/uffd-common.c\n+++ b/tools/testing/selftests/mm/uffd-common.c\n@@ -639,8 +639,13 @@ int __copy_page(uffd_global_test_opts_t *gopts, unsigned long offset, bool retry\n \t\tuffdio_copy.mode = 0;\n \tuffdio_copy.copy = 0;\n \tif (ioctl(gopts-\u003euffd, UFFDIO_COPY, \u0026uffdio_copy)) {\n-\t\t/* real retval in ufdio_copy.copy */\n-\t\tif (uffdio_copy.copy != -EEXIST)\n+\t\t/*\n+\t\t * real retval in uffdio_copy.copy\n+\t\t *\n+\t\t * -EEXIST: the page was faulted in concurrently\n+\t\t * -ENOENT: the destination range was concurrently removed\n+\t\t */\n+\t\tif (uffdio_copy.copy != -EEXIST \u0026\u0026 uffdio_copy.copy != -ENOENT)\n \t\t\terr(\"UFFDIO_COPY error: %\"PRId64,\n \t\t\t    (int64_t)uffdio_copy.copy);\n \t\twake_range(gopts-\u003euffd, uffdio_copy.dst, gopts-\u003epage_size);\n"
}

2/1

2026/07/02 02:23

agent

patch-evaluator

Model:

gemini-3.1-pro-preview

Args:

null

Results:

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies user-space selftests (tools/testing/selftests/mm/uffd-common.c) and does not make 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 54c18cd2e3360cc091638cd71236c15ddfdf2828
Author: syz-cluster <triage@syzkaller.com>
Date:   Thu Jul 2 02:23:14 2026 +0000

    syz-cluster: applied patch under review

diff --git a/tools/testing/selftests/mm/uffd-common.c b/tools/testing/selftests/mm/uffd-common.c
index edd02328f77ba1..f48f5d4594ab00 100644
--- a/tools/testing/selftests/mm/uffd-common.c
+++ b/tools/testing/selftests/mm/uffd-common.c
@@ -639,8 +639,13 @@ int __copy_page(uffd_global_test_opts_t *gopts, unsigned long offset, bool retry
 		uffdio_copy.mode = 0;
 	uffdio_copy.copy = 0;
 	if (ioctl(gopts->uffd, UFFDIO_COPY, &uffdio_copy)) {
-		/* real retval in ufdio_copy.copy */
-		if (uffdio_copy.copy != -EEXIST)
+		/*
+		 * real retval in uffdio_copy.copy
+		 *
+		 * -EEXIST: the page was faulted in concurrently
+		 * -ENOENT: the destination range was concurrently removed
+		 */
+		if (uffdio_copy.copy != -EEXIST && uffdio_copy.copy != -ENOENT)
 			err("UFFDIO_COPY error: %"PRId64,
 			    (int64_t)uffdio_copy.copy);
 		wake_range(gopts->uffd, uffdio_copy.dst, gopts->page_size);

3/2

2026/07/02 02:23

llm

patch-evaluator

Model:

gemini-3.1-pro-preview

Args:

null

Results:

null

Tokens:

							input: 2008
							output: 72
							thoughts: 195

Thoughts:

**WorthFuzzing=false: A Quick Analysis**

Okay, let's break this down. The patch focuses on modifying a selftest file: specifically, `tools/testing/selftests/mm/uffd-common.c`. I immediately key in on the "selftests" directory. That's a huge clue. This change is *not* occurring within the kernel itself. It's user-space testing code. It's manipulating the conditions within the `__copy_page` function, and adding `-ENOENT` to ignored errors, but all within a testing context.

Since this patch is making changes in user space only, the functionality of the kernel isn't being altered. It doesn't present any new code that needs to be fuzzed from a kernel perspective. Therefore, I'm confident in setting `WorthFuzzing=false`. Just to be sure, I will double-check that the file location confirms my initial assessment. Yes, confirmed. `tools/testing/selftests/` is indeed in userspace. I'll make the call, and report `WorthFuzzing=false`.

4/2

2026/07/02 02:23

tool

set-results

Args:

{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies user-space selftests (tools/testing/selftests/mm/uffd-common.c) and does not make any functional changes to the kernel code itself.",
  "WorthFuzzing": false
}

Results:

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies user-space selftests (tools/testing/selftests/mm/uffd-common.c) and does not make 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)