AI Trajectory

null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies a selftest file (tools/testing/selftests/mincore/mincore_selftest.c), which does not affect the kernel source code or its execution flow.",
  "WorthFuzzing": false
}

null

{
  "PatchDiff": "commit 29327d36a9b85e09ef95502a06970f1d28341448\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Wed Jul 8 20:50:11 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/tools/testing/selftests/mincore/mincore_selftest.c b/tools/testing/selftests/mincore/mincore_selftest.c\nindex cdd022c1c49746..18dfbf318b1f48 100644\n--- a/tools/testing/selftests/mincore/mincore_selftest.c\n+++ b/tools/testing/selftests/mincore/mincore_selftest.c\n@@ -242,8 +242,10 @@ TEST(check_file_mmap)\n \t}\n \n \t/*\n-\t * Touch a page in the middle of the mapping. We expect the next\n-\t * few pages (the readahead window) to be populated too.\n+\t * Touch a page in the middle of the mapping. We expect some\n+\t * surrounding pages (the readahead window) to be populated too.\n+\t * Depending on the page size and readahead setting, the pages may\n+\t * land before the faulted page rather than after it.\n \t */\n \taddr[FILE_SIZE / 2] = 1;\n \tretval = mincore(addr, FILE_SIZE, vec);\n@@ -252,6 +254,12 @@ TEST(check_file_mmap)\n \t\tTH_LOG(\"Page not found in memory after use\");\n \t}\n \n+\ti = FILE_SIZE / 2 / page_size - 1;\n+\twhile (i \u003e= 0 \u0026\u0026 vec[i]) {\n+\t\tra_pages++;\n+\t\ti--;\n+\t}\n+\n \ti = FILE_SIZE / 2 / page_size + 1;\n \twhile (i \u003c vec_size \u0026\u0026 vec[i]) {\n \t\tra_pages++;\n"
}

gemini-3.1-pro-preview

null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies a selftest file (tools/testing/selftests/mincore/mincore_selftest.c), which does not affect the kernel source code or its execution flow.",
  "WorthFuzzing": false
}

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.

For your convenience, here is the diff of the changes:
commit 29327d36a9b85e09ef95502a06970f1d28341448
Author: syz-cluster <triage@syzkaller.com>
Date:   Wed Jul 8 20:50:11 2026 +0000

    syz-cluster: applied patch under review

diff --git a/tools/testing/selftests/mincore/mincore_selftest.c b/tools/testing/selftests/mincore/mincore_selftest.c
index cdd022c1c49746..18dfbf318b1f48 100644
--- a/tools/testing/selftests/mincore/mincore_selftest.c
+++ b/tools/testing/selftests/mincore/mincore_selftest.c
@@ -242,8 +242,10 @@ TEST(check_file_mmap)
 	}
 
 	/*
-	 * Touch a page in the middle of the mapping. We expect the next
-	 * few pages (the readahead window) to be populated too.
+	 * Touch a page in the middle of the mapping. We expect some
+	 * surrounding pages (the readahead window) to be populated too.
+	 * Depending on the page size and readahead setting, the pages may
+	 * land before the faulted page rather than after it.
 	 */
 	addr[FILE_SIZE / 2] = 1;
 	retval = mincore(addr, FILE_SIZE, vec);
@@ -252,6 +254,12 @@ TEST(check_file_mmap)
 		TH_LOG("Page not found in memory after use");
 	}
 
+	i = FILE_SIZE / 2 / page_size - 1;
+	while (i >= 0 && vec[i]) {
+		ra_pages++;
+		i--;
+	}
+
 	i = FILE_SIZE / 2 / page_size + 1;
 	while (i < vec_size && vec[i]) {
 		ra_pages++;

gemini-3.1-pro-preview

null

null

							input: 2063
							output: 72
							thoughts: 66
						

**WorthFuzzing=False**

Okay, so I'm looking at this patch and immediately I see it's touching `tools/testing/selftests/mincore/mincore_selftest.c`. Alright, that's a *selftest* file. This means it's for verifying the kernel's behavior and running tests on it, not actually part of the core kernel code itself. Therefore, it's not going to introduce any new functionality or change existing behavior that needs fuzzing. Any fuzzing of this would be aimed at the self-test code, not the core kernel functions, and that's not what I'm looking for. So, definitely no changes here that would warrant fuzzing of the kernel itself. The answer is clear: I'll return `WorthFuzzing=false`.

{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies a selftest file (tools/testing/selftests/mincore/mincore_selftest.c), which does not affect the kernel source code or its execution flow.",
  "WorthFuzzing": false
}

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies a selftest file (tools/testing/selftests/mincore/mincore_selftest.c), which does not affect the kernel source code or its execution flow.",
  "WorthFuzzing": false
}