AI Trajectory

Trajectory: (Expand/Collapse All)
Seq	Timestamp	Type	Name	Duration
0/0	2026/06/27 01:16	flow	patch-triage	0m Args: null Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch only modifies a documentation file (Documentation/admin-guide/mm/pagemap.rst). There are no functional code changes.", "WorthFuzzing": false }
1/1	2026/06/27 01:16	action	read-patch-diff	0m Args: null Results: { "PatchDiff": "commit 57d08fa8fcd774d50b0eda3d55afbc2f9b1dc808\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Sat Jun 27 01:16:57 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/Documentation/admin-guide/mm/pagemap.rst b/Documentation/admin-guide/mm/pagemap.rst\nindex c57e61b5d8aa81..20e3fe76f09964 100644\n--- a/Documentation/admin-guide/mm/pagemap.rst\n+++ b/Documentation/admin-guide/mm/pagemap.rst\n@@ -67,7 +67,7 @@ number of times a page is mapped.\n * ``/proc/kpageflags``. This file contains a 64-bit set of flags for each\n page, indexed by PFN.\n \n- The flags are (from ``fs/proc/page.c``, above kpageflags_read):\n+ The flags are (from ``include/uapi/linux/kernel-page-flags.h``):\n \n 0. LOCKED\n 1. ERROR\n@@ -264,7 +264,7 @@ The ``struct pm_scan_arg`` is used as the argument of the IOCTL.\n provided or not.\n 3. The range is specified through ``start`` and ``end``.\n 4. The walk can abort before visiting the complete range such as the user buffer\n- can get full etc. The walk ending address is specified in``end_walk``.\n+ can get full etc. The walk ending address is specified in ``walk_end``.\n 5. The output buffer of ``struct page_region`` array and size is specified in\n ``vec`` and ``vec_len``.\n 6. The optional maximum requested pages are specified in the ``max_pages``.\n@@ -275,7 +275,7 @@ Find pages which have been written and WP them as well::\n \n struct pm_scan_arg arg = {\n .size = sizeof(arg),\n- .flags = PM_SCAN_CHECK_WPASYNC \| PM_SCAN_CHECK_WPASYNC,\n+ .flags = PM_SCAN_WP_MATCHING \| PM_SCAN_CHECK_WPASYNC,\n ..\n .category_mask = PAGE_IS_WRITTEN,\n .return_mask = PAGE_IS_WRITTEN,\n@@ -288,7 +288,7 @@ present or huge::\n .size = sizeof(arg),\n .flags = 0,\n ..\n- .category_mask = PAGE_IS_WRITTEN \| PAGE_IS_SWAPPED,\n+ .category_mask = PAGE_IS_WRITTEN \| PAGE_IS_FILE,\n .category_inverted = PAGE_IS_SWAPPED,\n .category_anyof_mask = PAGE_IS_PRESENT \| PAGE_IS_HUGE,\n .return_mask = PAGE_IS_WRITTEN \| PAGE_IS_SWAPPED \|\n" }
2/1	2026/06/27 01:16	agent	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch only modifies a documentation file (Documentation/admin-guide/mm/pagemap.rst). There are no functional code changes.", "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 57d08fa8fcd774d50b0eda3d55afbc2f9b1dc808 Author: syz-cluster <triage@syzkaller.com> Date: Sat Jun 27 01:16:57 2026 +0000 syz-cluster: applied patch under review diff --git a/Documentation/admin-guide/mm/pagemap.rst b/Documentation/admin-guide/mm/pagemap.rst index c57e61b5d8aa81..20e3fe76f09964 100644 --- a/Documentation/admin-guide/mm/pagemap.rst +++ b/Documentation/admin-guide/mm/pagemap.rst @@ -67,7 +67,7 @@ number of times a page is mapped. * ``/proc/kpageflags``. This file contains a 64-bit set of flags for each page, indexed by PFN. - The flags are (from ``fs/proc/page.c``, above kpageflags_read): + The flags are (from ``include/uapi/linux/kernel-page-flags.h``): 0. LOCKED 1. ERROR @@ -264,7 +264,7 @@ The ``struct pm_scan_arg`` is used as the argument of the IOCTL. provided or not. 3. The range is specified through ``start`` and ``end``. 4. The walk can abort before visiting the complete range such as the user buffer - can get full etc. The walk ending address is specified in``end_walk``. + can get full etc. The walk ending address is specified in ``walk_end``. 5. The output buffer of ``struct page_region`` array and size is specified in ``vec`` and ``vec_len``. 6. The optional maximum requested pages are specified in the ``max_pages``. @@ -275,7 +275,7 @@ Find pages which have been written and WP them as well:: struct pm_scan_arg arg = { .size = sizeof(arg), - .flags = PM_SCAN_CHECK_WPASYNC \| PM_SCAN_CHECK_WPASYNC, + .flags = PM_SCAN_WP_MATCHING \| PM_SCAN_CHECK_WPASYNC, .. .category_mask = PAGE_IS_WRITTEN, .return_mask = PAGE_IS_WRITTEN, @@ -288,7 +288,7 @@ present or huge:: .size = sizeof(arg), .flags = 0, .. - .category_mask = PAGE_IS_WRITTEN \| PAGE_IS_SWAPPED, + .category_mask = PAGE_IS_WRITTEN \| PAGE_IS_FILE, .category_inverted = PAGE_IS_SWAPPED, .category_anyof_mask = PAGE_IS_PRESENT \| PAGE_IS_HUGE, .return_mask = PAGE_IS_WRITTEN \| PAGE_IS_SWAPPED \|
3/2	2026/06/27 01:16	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 2284 output: 60 thoughts: 731 Thoughts: Documentation-Only Patch - WorthFuzzing=false Okay, so this patch is only touching the documentation, specifically `Documentation/admin-guide/mm/pagemap.rst`. No code changes whatsoever. Given that, I'm pretty confident I need to set `WorthFuzzing=false` here. No need to waste resources on fuzzing documentation changes. Let's quickly double-check the diff just to be extra sure. Looks like my initial assessment is correct, it's all documentation updates. The changes are minor: updating the source file for page flags, and renaming an end variable in pm\_scan\_arg, and the flag names. Nothing that could introduce a bug or vulnerability. Yep, just a documentation fix. Setting the results now.
4/2	2026/06/27 01:17	tool	set-results	0m Args: { "EnableConfigs": [], "FocusSymbols": [], "Reasoning": "The patch only modifies a documentation file (Documentation/admin-guide/mm/pagemap.rst). There are no functional code changes.", "WorthFuzzing": false } Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch only modifies a documentation file (Documentation/admin-guide/mm/pagemap.rst). There are no functional code changes.", "WorthFuzzing": false }

Trajectory: (Expand/Collapse All)

Seq

Timestamp

Type

Name

Duration

0/0

2026/06/27 01:16

flow

patch-triage

Args:

null

Results:

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies a documentation file (Documentation/admin-guide/mm/pagemap.rst). There are no functional code changes.",
  "WorthFuzzing": false
}

1/1

2026/06/27 01:16

action

read-patch-diff

Args:

null

Results:

{
  "PatchDiff": "commit 57d08fa8fcd774d50b0eda3d55afbc2f9b1dc808\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Sat Jun 27 01:16:57 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/Documentation/admin-guide/mm/pagemap.rst b/Documentation/admin-guide/mm/pagemap.rst\nindex c57e61b5d8aa81..20e3fe76f09964 100644\n--- a/Documentation/admin-guide/mm/pagemap.rst\n+++ b/Documentation/admin-guide/mm/pagemap.rst\n@@ -67,7 +67,7 @@ number of times a page is mapped.\n  * ``/proc/kpageflags``.  This file contains a 64-bit set of flags for each\n    page, indexed by PFN.\n \n-   The flags are (from ``fs/proc/page.c``, above kpageflags_read):\n+   The flags are (from ``include/uapi/linux/kernel-page-flags.h``):\n \n     0. LOCKED\n     1. ERROR\n@@ -264,7 +264,7 @@ The ``struct pm_scan_arg`` is used as the argument of the IOCTL.\n     provided or not.\n  3. The range is specified through ``start`` and ``end``.\n  4. The walk can abort before visiting the complete range such as the user buffer\n-    can get full etc. The walk ending address is specified in``end_walk``.\n+    can get full etc. The walk ending address is specified in ``walk_end``.\n  5. The output buffer of ``struct page_region`` array and size is specified in\n     ``vec`` and ``vec_len``.\n  6. The optional maximum requested pages are specified in the ``max_pages``.\n@@ -275,7 +275,7 @@ Find pages which have been written and WP them as well::\n \n    struct pm_scan_arg arg = {\n    .size = sizeof(arg),\n-   .flags = PM_SCAN_CHECK_WPASYNC | PM_SCAN_CHECK_WPASYNC,\n+   .flags = PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,\n    ..\n    .category_mask = PAGE_IS_WRITTEN,\n    .return_mask = PAGE_IS_WRITTEN,\n@@ -288,7 +288,7 @@ present or huge::\n    .size = sizeof(arg),\n    .flags = 0,\n    ..\n-   .category_mask = PAGE_IS_WRITTEN | PAGE_IS_SWAPPED,\n+   .category_mask = PAGE_IS_WRITTEN | PAGE_IS_FILE,\n    .category_inverted = PAGE_IS_SWAPPED,\n    .category_anyof_mask = PAGE_IS_PRESENT | PAGE_IS_HUGE,\n    .return_mask = PAGE_IS_WRITTEN | PAGE_IS_SWAPPED |\n"
}

2/1

2026/06/27 01:16

agent

patch-evaluator

Model:

gemini-3.1-pro-preview

Args:

null

Results:

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies a documentation file (Documentation/admin-guide/mm/pagemap.rst). There are no functional code changes.",
  "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 57d08fa8fcd774d50b0eda3d55afbc2f9b1dc808
Author: syz-cluster <triage@syzkaller.com>
Date:   Sat Jun 27 01:16:57 2026 +0000

    syz-cluster: applied patch under review

diff --git a/Documentation/admin-guide/mm/pagemap.rst b/Documentation/admin-guide/mm/pagemap.rst
index c57e61b5d8aa81..20e3fe76f09964 100644
--- a/Documentation/admin-guide/mm/pagemap.rst
+++ b/Documentation/admin-guide/mm/pagemap.rst
@@ -67,7 +67,7 @@ number of times a page is mapped.
  * ``/proc/kpageflags``.  This file contains a 64-bit set of flags for each
    page, indexed by PFN.
 
-   The flags are (from ``fs/proc/page.c``, above kpageflags_read):
+   The flags are (from ``include/uapi/linux/kernel-page-flags.h``):
 
     0. LOCKED
     1. ERROR
@@ -264,7 +264,7 @@ The ``struct pm_scan_arg`` is used as the argument of the IOCTL.
     provided or not.
  3. The range is specified through ``start`` and ``end``.
  4. The walk can abort before visiting the complete range such as the user buffer
-    can get full etc. The walk ending address is specified in``end_walk``.
+    can get full etc. The walk ending address is specified in ``walk_end``.
  5. The output buffer of ``struct page_region`` array and size is specified in
     ``vec`` and ``vec_len``.
  6. The optional maximum requested pages are specified in the ``max_pages``.
@@ -275,7 +275,7 @@ Find pages which have been written and WP them as well::
 
    struct pm_scan_arg arg = {
    .size = sizeof(arg),
-   .flags = PM_SCAN_CHECK_WPASYNC | PM_SCAN_CHECK_WPASYNC,
+   .flags = PM_SCAN_WP_MATCHING | PM_SCAN_CHECK_WPASYNC,
    ..
    .category_mask = PAGE_IS_WRITTEN,
    .return_mask = PAGE_IS_WRITTEN,
@@ -288,7 +288,7 @@ present or huge::
    .size = sizeof(arg),
    .flags = 0,
    ..
-   .category_mask = PAGE_IS_WRITTEN | PAGE_IS_SWAPPED,
+   .category_mask = PAGE_IS_WRITTEN | PAGE_IS_FILE,
    .category_inverted = PAGE_IS_SWAPPED,
    .category_anyof_mask = PAGE_IS_PRESENT | PAGE_IS_HUGE,
    .return_mask = PAGE_IS_WRITTEN | PAGE_IS_SWAPPED |

3/2

2026/06/27 01:16

llm

patch-evaluator

Model:

gemini-3.1-pro-preview

Args:

null

Results:

null

Tokens:

							input: 2284
							output: 60
							thoughts: 731

Thoughts:

**Documentation-Only Patch - WorthFuzzing=false**

Okay, so this patch is only touching the documentation, specifically `Documentation/admin-guide/mm/pagemap.rst`. No code changes whatsoever. Given that, I'm pretty confident I need to set `WorthFuzzing=false` here. No need to waste resources on fuzzing documentation changes.

Let's quickly double-check the diff just to be extra sure. *Looks* like my initial assessment is correct, it's all documentation updates. The changes are minor: updating the source file for page flags, and renaming an end variable in pm\_scan\_arg, and the flag names. Nothing that could introduce a bug or vulnerability. 

Yep, just a documentation fix. Setting the results now.

4/2

2026/06/27 01:17

tool

set-results

Args:

{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies a documentation file (Documentation/admin-guide/mm/pagemap.rst). There are no functional code changes.",
  "WorthFuzzing": false
}

Results:

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies a documentation file (Documentation/admin-guide/mm/pagemap.rst). There are no functional code changes.",
  "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)