AI Trajectory


Trajectory: (Expand/Collapse All)
Seq Timestamp Type Name Duration
0/0 2026/08/27 03:09 flow patch-triage
0m Args: 
null

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "KMSANReasoning": "",
  "NeedsKMSAN": false,
  "Reasoning": "The patch only modifies a Python script used for testing (tools/testing/selftests/damon/_damon_sysfs.py). It fixes mutable default arguments in Python functions. It does not make any functional changes to the kernel code itself.",
  "WorthFuzzing": false
}
1/1 2026/08/27 03:09 action read-patch-diff
0m Args: 
null

Results: 
{
  "PatchDiff": "commit 198d3dc44709062a34b42f8412bff6dbb3d83408\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Thu Aug 27 03:09:33 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/tools/testing/selftests/damon/_damon_sysfs.py b/tools/testing/selftests/damon/_damon_sysfs.py\nindex e6a2265d721e8..f604b7d6530b3 100644\n--- a/tools/testing/selftests/damon/_damon_sysfs.py\n+++ b/tools/testing/selftests/damon/_damon_sysfs.py\n@@ -321,8 +321,10 @@ class DamosFilters:\n     filters = None\n     scheme = None   # owner scheme\n \n-    def __init__(self, name, filters=[]):\n+    def __init__(self, name, filters=None):\n         self.name = name\n+        if filters is None:\n+            filters = []\n         self.filters = filters\n         for idx, filter_ in enumerate(self.filters):\n             filter_.idx = idx\n@@ -368,7 +370,9 @@ class DamosDests:\n     dests = None\n     scheme = None   # owner scheme\n \n-    def __init__(self, dests=[]):\n+    def __init__(self, dests=None):\n+        if dests is None:\n+            dests = []\n         self.dests = dests\n         for idx, dest in enumerate(self.dests):\n             dest.idx = idx\n@@ -426,15 +430,21 @@ class Damos:\n     stats = None\n     tried_regions = None\n \n-    def __init__(self, action='stat', access_pattern=DamosAccessPattern(),\n-                 quota=DamosQuota(), watermarks=DamosWatermarks(),\n-                 core_filters=[], ops_filters=[], filters=[], target_nid=0,\n-                 dests=DamosDests(), apply_interval_us=0):\n+    def __init__(self, action='stat', access_pattern=None, quota=None,\n+                 watermarks=None, core_filters=None, ops_filters=None,\n+                 filters=None, target_nid=0, dests=None,\n+                 apply_interval_us=0):\n         self.action = action\n+        if access_pattern is None:\n+            access_pattern = DamosAccessPattern()\n         self.access_pattern = access_pattern\n         self.access_pattern.scheme = self\n+        if quota is None:\n+            quota = DamosQuota()\n         self.quota = quota\n         self.quota.scheme = self\n+        if watermarks is None:\n+            watermarks = DamosWatermarks()\n         self.watermarks = watermarks\n         self.watermarks.scheme = self\n \n@@ -448,6 +458,8 @@ class Damos:\n         self.filters.scheme = self\n \n         self.target_nid = target_nid\n+        if dests is None:\n+            dests = DamosDests()\n         self.dests = dests\n         self.dests.scheme = self\n \n@@ -568,10 +580,12 @@ class DamonAttrs:\n     context = None\n \n     def __init__(self, sample_us=5000, aggr_us=100000,\n-                 intervals_goal=IntervalsGoal(), update_us=1000000,\n-            min_nr_regions=10, max_nr_regions=1000):\n+                 intervals_goal=None, update_us=1000000, min_nr_regions=10,\n+                 max_nr_regions=1000):\n         self.sample_us = sample_us\n         self.aggr_us = aggr_us\n+        if intervals_goal is None:\n+            intervals_goal = IntervalsGoal()\n         self.intervals_goal = intervals_goal\n         self.intervals_goal.attrs = self\n         self.update_us = update_us\n@@ -703,7 +717,9 @@ class Kdamond:\n     idx = None      # index of this kdamond between siblings\n     kdamonds = None # parent\n \n-    def __init__(self, contexts=[], refresh_ms=None):\n+    def __init__(self, contexts=None, refresh_ms=None):\n+        if contexts is None:\n+            contexts = []\n         self.contexts = contexts\n         self.refresh_ms = refresh_ms\n         for idx, context in enumerate(self.contexts):\n@@ -853,7 +869,9 @@ class Kdamond:\n class Kdamonds:\n     kdamonds = []\n \n-    def __init__(self, kdamonds=[]):\n+    def __init__(self, kdamonds=None):\n+        if kdamonds is None:\n+            kdamonds = []\n         self.kdamonds = kdamonds\n         for idx, kdamond in enumerate(self.kdamonds):\n             kdamond.idx = idx\n"
}
2/1 2026/08/27 03:09 agent patch-evaluator
0m Model: 
best-expensive

Args: 
null

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies a Python script used for testing (tools/testing/selftests/damon/_damon_sysfs.py). It fixes mutable default arguments in Python functions. It 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).
- 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 198d3dc44709062a34b42f8412bff6dbb3d83408
Author: syz-cluster <triage@syzkaller.com>
Date:   Thu Aug 27 03:09:33 2026 +0000

    syz-cluster: applied patch under review

diff --git a/tools/testing/selftests/damon/_damon_sysfs.py b/tools/testing/selftests/damon/_damon_sysfs.py
index e6a2265d721e8..f604b7d6530b3 100644
--- a/tools/testing/selftests/damon/_damon_sysfs.py
+++ b/tools/testing/selftests/damon/_damon_sysfs.py
@@ -321,8 +321,10 @@ class DamosFilters:
     filters = None
     scheme = None   # owner scheme
 
-    def __init__(self, name, filters=[]):
+    def __init__(self, name, filters=None):
         self.name = name
+        if filters is None:
+            filters = []
         self.filters = filters
         for idx, filter_ in enumerate(self.filters):
             filter_.idx = idx
@@ -368,7 +370,9 @@ class DamosDests:
     dests = None
     scheme = None   # owner scheme
 
-    def __init__(self, dests=[]):
+    def __init__(self, dests=None):
+        if dests is None:
+            dests = []
         self.dests = dests
         for idx, dest in enumerate(self.dests):
             dest.idx = idx
@@ -426,15 +430,21 @@ class Damos:
     stats = None
     tried_regions = None
 
-    def __init__(self, action='stat', access_pattern=DamosAccessPattern(),
-                 quota=DamosQuota(), watermarks=DamosWatermarks(),
-                 core_filters=[], ops_filters=[], filters=[], target_nid=0,
-                 dests=DamosDests(), apply_interval_us=0):
+    def __init__(self, action='stat', access_pattern=None, quota=None,
+                 watermarks=None, core_filters=None, ops_filters=None,
+                 filters=None, target_nid=0, dests=None,
+                 apply_interval_us=0):
         self.action = action
+        if access_pattern is None:
+            access_pattern = DamosAccessPattern()
         self.access_pattern = access_pattern
         self.access_pattern.scheme = self
+        if quota is None:
+            quota = DamosQuota()
         self.quota = quota
         self.quota.scheme = self
+        if watermarks is None:
+            watermarks = DamosWatermarks()
         self.watermarks = watermarks
         self.watermarks.scheme = self
 
@@ -448,6 +458,8 @@ class Damos:
         self.filters.scheme = self
 
         self.target_nid = target_nid
+        if dests is None:
+            dests = DamosDests()
         self.dests = dests
         self.dests.scheme = self
 
@@ -568,10 +580,12 @@ class DamonAttrs:
     context = None
 
     def __init__(self, sample_us=5000, aggr_us=100000,
-                 intervals_goal=IntervalsGoal(), update_us=1000000,
-            min_nr_regions=10, max_nr_regions=1000):
+                 intervals_goal=None, update_us=1000000, min_nr_regions=10,
+                 max_nr_regions=1000):
         self.sample_us = sample_us
         self.aggr_us = aggr_us
+        if intervals_goal is None:
+            intervals_goal = IntervalsGoal()
         self.intervals_goal = intervals_goal
         self.intervals_goal.attrs = self
         self.update_us = update_us
@@ -703,7 +717,9 @@ class Kdamond:
     idx = None      # index of this kdamond between siblings
     kdamonds = None # parent
 
-    def __init__(self, contexts=[], refresh_ms=None):
+    def __init__(self, contexts=None, refresh_ms=None):
+        if contexts is None:
+            contexts = []
         self.contexts = contexts
         self.refresh_ms = refresh_ms
         for idx, context in enumerate(self.contexts):
@@ -853,7 +869,9 @@ class Kdamond:
 class Kdamonds:
     kdamonds = []
 
-    def __init__(self, kdamonds=[]):
+    def __init__(self, kdamonds=None):
+        if kdamonds is None:
+            kdamonds = []
         self.kdamonds = kdamonds
         for idx, kdamond in enumerate(self.kdamonds):
             kdamond.idx = idx

3/2 2026/08/27 03:09 llm patch-evaluator
0m Model: 
gemini-3.1-pro-preview

Args: 
null

Results: 
null

Tokens: 
							input: 2991
							output: 83
							thoughts: 124

Thoughts: 
**WorthFuzzing=False: A Python Selftest Fix**

Okay, so I've looked at this patch. It's touching `tools/testing/selftests/damon/_damon_sysfs.py`. Right away, I see it's dealing with a selftest script. That's good, I know where this is headed. My job is to determine if this patch changes the functional behavior of the kernel in a way that needs fuzzing, right? And this is a *selftest*. These scripts aren't part of the core kernel code that's running in production, so any bugs here don't directly affect that production code. This patch addresses mutable default arguments in Python functions, like changing `filters=[]` to `filters=None` and handling that correctly. A good practice, of course, but not a functional kernel change. Syzkaller doesn't fuzz selftests, thankfully. Therefore, this change doesn't introduce any new attack surfaces or kernel behavior that needs fuzzing. So, the verdict is in: WorthFuzzing=false.

4/2 2026/08/27 03:09 tool set-results
0m Args: 
{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies a Python script used for testing (tools/testing/selftests/damon/_damon_sysfs.py). It fixes mutable default arguments in Python functions. It does not make any functional changes to the kernel code itself.",
  "WorthFuzzing": false
}

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies a Python script used for testing (tools/testing/selftests/damon/_damon_sysfs.py). It fixes mutable default arguments in Python functions. It does not make any functional changes to the kernel code itself.",
  "WorthFuzzing": false
}
5/1 2026/08/27 03:09 action If
0m 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)