AI Trajectory

Trajectory: (Expand/Collapse All)
Seq	Timestamp	Type	Name	Duration
0/0	2026/08/11 04:23	flow	patch-triage	0m Args: null Results: { "EnableConfigs": null, "FocusSymbols": [], "KMSANReasoning": "", "NeedsKMSAN": false, "Reasoning": "The patch replaces the magic number 1000 with the macro OOM_SCORE_ADJ_MAX (which is defined as 1000) in proc_oom_score and oom_badness. This is a purely cosmetic change to numeric constants that does not functionally alter execution flow.", "WorthFuzzing": false }
1/1	2026/08/11 04:23	action	read-patch-diff	0m Args: null Results: { "PatchDiff": "commit b0d295664551140a7b99f0ae1d002950ddc0f5ac\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Tue Aug 11 04:23:23 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/fs/proc/base.c b/fs/proc/base.c\nindex 6a39de424f62a..58be389424605 100644\n--- a/fs/proc/base.c\n+++ b/fs/proc/base.c\n@@ -594,7 +594,8 @@ static int proc_oom_score(struct seq_file m, struct pid_namespace ns,\n \t * exporting for a long time so userspace might depend on it.\n \t /\n \tif (badness != LONG_MIN)\n-\t\tpoints = (1000 + badness 1000 / (long)totalpages) * 2 / 3;\n+\t\tpoints = (OOM_SCORE_ADJ_MAX +\n+\t\t\t badness * OOM_SCORE_ADJ_MAX / (long)totalpages) * 2 / 3;\n \n \tseq_printf(m, \"%lu\\n\", points);\n \ndiff --git a/mm/oom_kill.c b/mm/oom_kill.c\nindex 5f372f6e26fa3..08bff7a55db8d 100644\n--- a/mm/oom_kill.c\n+++ b/mm/oom_kill.c\n@@ -230,7 +230,7 @@ long oom_badness(struct task_struct p, unsigned long totalpages)\n \ttask_unlock(p);\n \n \t/ Normalize to oom_score_adj units /\n-\tadj = totalpages / 1000;\n+\tadj *= totalpages / OOM_SCORE_ADJ_MAX;\n \tpoints += adj;\n \n \treturn points;\n" }
2/1	2026/08/11 04:23	agent	patch-evaluator	0m Model: best-expensive Args: null Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch replaces the magic number 1000 with the macro OOM_SCORE_ADJ_MAX (which is defined as 1000) in proc_oom_score and oom_badness. This is a purely cosmetic change to numeric constants that does not functionally alter execution flow.", "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). - Code in vendor-specific PCIe switch, SmartNIC, or GPU drivers (e.g., mlxsw, pds_core, qed, ionic, amdgpu) that require physical PCIe hardware cards not emulated in standard QEMU. - Driver .remove, .shutdown, or pci_unregister_driver teardown callbacks (e.g., igb_remove) that are executed only during PCI hot-unplug or sysfs driver unbind operations. 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. Prefer non-static, non-inlined API entrypoint functions over internal static helper functions (which are inlined by the compiler and do not have distinct symbol addresses). 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. Also check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed for Kbuild to compile the code statically into vmlinux. 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 b0d295664551140a7b99f0ae1d002950ddc0f5ac Author: syz-cluster <triage@syzkaller.com> Date: Tue Aug 11 04:23:23 2026 +0000 syz-cluster: applied patch under review diff --git a/fs/proc/base.c b/fs/proc/base.c index 6a39de424f62a..58be389424605 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -594,7 +594,8 @@ static int proc_oom_score(struct seq_file m, struct pid_namespace ns, * exporting for a long time so userspace might depend on it. / if (badness != LONG_MIN) - points = (1000 + badness 1000 / (long)totalpages) * 2 / 3; + points = (OOM_SCORE_ADJ_MAX + + badness * OOM_SCORE_ADJ_MAX / (long)totalpages) * 2 / 3; seq_printf(m, "%lu\n", points); diff --git a/mm/oom_kill.c b/mm/oom_kill.c index 5f372f6e26fa3..08bff7a55db8d 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -230,7 +230,7 @@ long oom_badness(struct task_struct p, unsigned long totalpages) task_unlock(p); / Normalize to oom_score_adj units / - adj = totalpages / 1000; + adj *= totalpages / OOM_SCORE_ADJ_MAX; points += adj; return points;
3/2	2026/08/11 04:23	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 2211 output: 25 thoughts: 161 Thoughts: Analyzing a Code Patch Okay, so I'm looking at this patch – it looks like someone's changed some code in `fs/proc/base.c` and `mm/oom_kill.c`. They've swapped out the hardcoded value `1000` for `OOM_SCORE_ADJ_MAX` in `proc_oom_score` and `oom_badness`. My first instinct is to check what `OOM_SCORE_ADJ_MAX` actually is. It's usually defined as 1000, but I need to be sure. Let's see... Yep, the definition is in `include/uapi/linux/oom.h`, and, as expected, it's defined as 1000. So, essentially, it looks like they're just doing a macro replacement here, replacing a literal numeric constant with a symbolic constant. It's good practice, of course, for maintainability and potential future changes if that value were to ever be changed (though unlikely). Still, I want to verify that `OOM_SCORE_ADJ_MAX` is definitely 1000 in this context, just to make sure I'm not missing something subtly different.
4/2	2026/08/11 04:23	tool	grepper	0m Args: { "Expression": "#define OOM_SCORE_ADJ_MAX" } Results: { "Output": "include/uapi/linux/oom.h-9-#define OOM_SCORE_ADJ_MIN\t(-1000)\ninclude/uapi/linux/oom.h:10:#define OOM_SCORE_ADJ_MAX\t1000\ninclude/uapi/linux/oom.h-11-\n" }
5/2	2026/08/11 04:23	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 2756 output: 95 thoughts: 532 Thoughts: Refactoring Observation: OOM Score Adjustment Okay, so I've looked at this patch. It's straightforward. The key is that `OOM_SCORE_ADJ_MAX` is indeed defined as 1000. The change is simply substituting the literal value '1000' with the macro `OOM_SCORE_ADJ_MAX` in both `proc_oom_score` and `oom_badness`. This is purely a refactoring exercise; a cleanup. It swaps out a "magic number" with a defined macro. There's no modification to the execution path, algorithm, or any behavior that would lead to a functional change. The diff confirms this; it's a direct, one-to-one replacement in both locations. Therefore, given my understanding of the system, my assessment is that `WorthFuzzing=false` for this specific patch. There's nothing here that's going to trigger any new or interesting edge cases. This change is entirely cosmetic, from a functionality perspective.
6/2	2026/08/11 04:23	tool	set-results	0m Args: { "EnableConfigs": [], "FocusSymbols": [], "Reasoning": "The patch replaces the magic number 1000 with the macro OOM_SCORE_ADJ_MAX (which is defined as 1000) in proc_oom_score and oom_badness. This is a purely cosmetic change to numeric constants that does not functionally alter execution flow.", "WorthFuzzing": false } Results: { "EnableConfigs": null, "FocusSymbols": [], "Reasoning": "The patch replaces the magic number 1000 with the macro OOM_SCORE_ADJ_MAX (which is defined as 1000) in proc_oom_score and oom_badness. This is a purely cosmetic change to numeric constants that does not functionally alter execution flow.", "WorthFuzzing": false }
7/1	2026/08/11 04:23	action	If	0m Args: { "WorthFuzzing": false } Results: null

Trajectory: (Expand/Collapse All)

Seq

Timestamp

Type

Name

Duration

0/0

2026/08/11 04:23

flow

patch-triage

Args:

null

Results:

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "KMSANReasoning": "",
  "NeedsKMSAN": false,
  "Reasoning": "The patch replaces the magic number 1000 with the macro OOM_SCORE_ADJ_MAX (which is defined as 1000) in proc_oom_score and oom_badness. This is a purely cosmetic change to numeric constants that does not functionally alter execution flow.",
  "WorthFuzzing": false
}

1/1

2026/08/11 04:23

action

read-patch-diff

Args:

null

Results:

{
  "PatchDiff": "commit b0d295664551140a7b99f0ae1d002950ddc0f5ac\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Tue Aug 11 04:23:23 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/fs/proc/base.c b/fs/proc/base.c\nindex 6a39de424f62a..58be389424605 100644\n--- a/fs/proc/base.c\n+++ b/fs/proc/base.c\n@@ -594,7 +594,8 @@ static int proc_oom_score(struct seq_file *m, struct pid_namespace *ns,\n \t * exporting for a long time so userspace might depend on it.\n \t */\n \tif (badness != LONG_MIN)\n-\t\tpoints = (1000 + badness * 1000 / (long)totalpages) * 2 / 3;\n+\t\tpoints = (OOM_SCORE_ADJ_MAX +\n+\t\t\t  badness * OOM_SCORE_ADJ_MAX / (long)totalpages) * 2 / 3;\n \n \tseq_printf(m, \"%lu\\n\", points);\n \ndiff --git a/mm/oom_kill.c b/mm/oom_kill.c\nindex 5f372f6e26fa3..08bff7a55db8d 100644\n--- a/mm/oom_kill.c\n+++ b/mm/oom_kill.c\n@@ -230,7 +230,7 @@ long oom_badness(struct task_struct *p, unsigned long totalpages)\n \ttask_unlock(p);\n \n \t/* Normalize to oom_score_adj units */\n-\tadj *= totalpages / 1000;\n+\tadj *= totalpages / OOM_SCORE_ADJ_MAX;\n \tpoints += adj;\n \n \treturn points;\n"
}

2/1

2026/08/11 04:23

agent

patch-evaluator

Model:

best-expensive

Args:

null

Results:

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch replaces the magic number 1000 with the macro OOM_SCORE_ADJ_MAX (which is defined as 1000) in proc_oom_score and oom_badness. This is a purely cosmetic change to numeric constants that does not functionally alter execution flow.",
  "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).
- Code in vendor-specific PCIe switch, SmartNIC, or GPU drivers (e.g., mlxsw, pds_core, qed,
  ionic, amdgpu) that require physical PCIe hardware cards not emulated in standard QEMU.
- Driver .remove, .shutdown, or pci_unregister_driver teardown callbacks (e.g., igb_remove)
  that are executed only during PCI hot-unplug or sysfs driver unbind operations.

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.
   Prefer non-static, non-inlined API entrypoint functions over internal static helper functions
   (which are inlined by the compiler and do not have distinct symbol addresses).
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.
   Also check "depends on" lines in Kconfig to include any non-standard parent subsystem configs
   needed for Kbuild to compile the code statically into vmlinux. 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 b0d295664551140a7b99f0ae1d002950ddc0f5ac
Author: syz-cluster <triage@syzkaller.com>
Date:   Tue Aug 11 04:23:23 2026 +0000

    syz-cluster: applied patch under review

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 6a39de424f62a..58be389424605 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -594,7 +594,8 @@ static int proc_oom_score(struct seq_file *m, struct pid_namespace *ns,
 	 * exporting for a long time so userspace might depend on it.
 	 */
 	if (badness != LONG_MIN)
-		points = (1000 + badness * 1000 / (long)totalpages) * 2 / 3;
+		points = (OOM_SCORE_ADJ_MAX +
+			  badness * OOM_SCORE_ADJ_MAX / (long)totalpages) * 2 / 3;
 
 	seq_printf(m, "%lu\n", points);
 
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 5f372f6e26fa3..08bff7a55db8d 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -230,7 +230,7 @@ long oom_badness(struct task_struct *p, unsigned long totalpages)
 	task_unlock(p);
 
 	/* Normalize to oom_score_adj units */
-	adj *= totalpages / 1000;
+	adj *= totalpages / OOM_SCORE_ADJ_MAX;
 	points += adj;
 
 	return points;

3/2

2026/08/11 04:23

llm

patch-evaluator

Model:

gemini-3.1-pro-preview

Args:

null

Results:

null

Tokens:

							input: 2211
							output: 25
							thoughts: 161

Thoughts:

**Analyzing a Code Patch**

Okay, so I'm looking at this patch – it looks like someone's changed some code in `fs/proc/base.c` and `mm/oom_kill.c`. They've swapped out the hardcoded value `1000` for `OOM_SCORE_ADJ_MAX` in `proc_oom_score` and `oom_badness`. My first instinct is to check what `OOM_SCORE_ADJ_MAX` actually *is*. It's usually defined as 1000, but I need to be sure.

Let's see... Yep, the definition is in `include/uapi/linux/oom.h`, and, as expected, it's defined as 1000. So, essentially, it looks like they're just doing a macro replacement here, replacing a literal numeric constant with a symbolic constant. It's good practice, of course, for maintainability and potential future changes if that value were to ever be changed (though unlikely). Still, I want to verify that `OOM_SCORE_ADJ_MAX` is *definitely* 1000 in this context, just to make sure I'm not missing something subtly different.

4/2

2026/08/11 04:23

tool

grepper

Args:

{
  "Expression": "#define OOM_SCORE_ADJ_MAX"
}

Results:

{
  "Output": "include/uapi/linux/oom.h-9-#define OOM_SCORE_ADJ_MIN\t(-1000)\ninclude/uapi/linux/oom.h:10:#define OOM_SCORE_ADJ_MAX\t1000\ninclude/uapi/linux/oom.h-11-\n"
}

5/2

2026/08/11 04:23

llm

patch-evaluator

Model:

gemini-3.1-pro-preview

Args:

null

Results:

null

Tokens:

							input: 2756
							output: 95
							thoughts: 532

Thoughts:

**Refactoring Observation: OOM Score Adjustment**

Okay, so I've looked at this patch. It's straightforward. The key is that `OOM_SCORE_ADJ_MAX` is indeed defined as 1000. The change is simply substituting the literal value '1000' with the macro `OOM_SCORE_ADJ_MAX` in both `proc_oom_score` and `oom_badness`.

This is purely a refactoring exercise; a cleanup. It swaps out a "magic number" with a defined macro. There's no modification to the execution path, algorithm, or any behavior that would lead to a functional change. The diff confirms this; it's a direct, one-to-one replacement in both locations.

Therefore, given my understanding of the system, my assessment is that `WorthFuzzing=false` for this specific patch. There's nothing here that's going to trigger any new or interesting edge cases. This change is entirely cosmetic, from a functionality perspective.

6/2

2026/08/11 04:23

tool

set-results

Args:

{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch replaces the magic number 1000 with the macro OOM_SCORE_ADJ_MAX (which is defined as 1000) in proc_oom_score and oom_badness. This is a purely cosmetic change to numeric constants that does not functionally alter execution flow.",
  "WorthFuzzing": false
}

Results:

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch replaces the magic number 1000 with the macro OOM_SCORE_ADJ_MAX (which is defined as 1000) in proc_oom_score and oom_badness. This is a purely cosmetic change to numeric constants that does not functionally alter execution flow.",
  "WorthFuzzing": false
}

7/1

2026/08/11 04:23

action

Args:

{
  "WorthFuzzing": false
}

Results:

null

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)