AI Trajectory


Trajectory: (Expand/Collapse All)
Seq Timestamp Type Name Duration
0/0 2026/08/08 08:38 flow patch-triage
0m Args: 
null

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "KMSANReasoning": "",
  "NeedsKMSAN": false,
  "Reasoning": "The patch only modifies KVM selftests in tools/testing/selftests/, which are user-space testing tools and do not affect the kernel's functional execution flow.",
  "WorthFuzzing": false
}
1/1 2026/08/08 08:38 action read-patch-diff
0m Args: 
null

Results: 
{
  "PatchDiff": "commit 0f9bd66487536b03060b38952c55af56c4c4c9ad\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Sat Aug 8 08:38:41 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/tools/testing/selftests/kvm/x86/nx_huge_pages_test.c b/tools/testing/selftests/kvm/x86/nx_huge_pages_test.c\nindex 70950067b989a..49b70c05daec8 100644\n--- a/tools/testing/selftests/kvm/x86/nx_huge_pages_test.c\n+++ b/tools/testing/selftests/kvm/x86/nx_huge_pages_test.c\n@@ -120,6 +120,7 @@ void run_test(int reclaim_period_ms, bool disable_nx_huge_pages,\n \t\t} else {\n \t\t\tTEST_ASSERT(r == -1 \u0026\u0026 errno == EPERM,\n \t\t\t\t    \"This process should not have permission to disable NX huge pages\");\n+\t\t\tkvm_vm_free(vm);\n \t\t\treturn;\n \t\t}\n \t}\ndiff --git a/tools/testing/selftests/kvm/x86/sev_smoke_test.c b/tools/testing/selftests/kvm/x86/sev_smoke_test.c\nindex 6b2cbe2a90b7c..646ae93e3c461 100644\n--- a/tools/testing/selftests/kvm/x86/sev_smoke_test.c\n+++ b/tools/testing/selftests/kvm/x86/sev_smoke_test.c\n@@ -178,7 +178,7 @@ static void test_sev(void *guest_code, u32 type, u64 policy)\n \t\tcase UCALL_SYNC:\n \t\t\tcontinue;\n \t\tcase UCALL_DONE:\n-\t\t\treturn;\n+\t\t\tgoto done;\n \t\tcase UCALL_ABORT:\n \t\t\tREPORT_GUEST_ASSERT(uc);\n \t\tdefault:\n@@ -187,6 +187,7 @@ static void test_sev(void *guest_code, u32 type, u64 policy)\n \t\t}\n \t}\n \n+done:\n \tkvm_vm_free(vm);\n }\n \n"
}
2/1 2026/08/08 08:38 agent patch-evaluator
0m Model: 
best-expensive

Args: 
null

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies KVM selftests in tools/testing/selftests/, which are user-space testing tools and do not affect the kernel's functional 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 0f9bd66487536b03060b38952c55af56c4c4c9ad
Author: syz-cluster <triage@syzkaller.com>
Date:   Sat Aug 8 08:38:41 2026 +0000

    syz-cluster: applied patch under review

diff --git a/tools/testing/selftests/kvm/x86/nx_huge_pages_test.c b/tools/testing/selftests/kvm/x86/nx_huge_pages_test.c
index 70950067b989a..49b70c05daec8 100644
--- a/tools/testing/selftests/kvm/x86/nx_huge_pages_test.c
+++ b/tools/testing/selftests/kvm/x86/nx_huge_pages_test.c
@@ -120,6 +120,7 @@ void run_test(int reclaim_period_ms, bool disable_nx_huge_pages,
 		} else {
 			TEST_ASSERT(r == -1 && errno == EPERM,
 				    "This process should not have permission to disable NX huge pages");
+			kvm_vm_free(vm);
 			return;
 		}
 	}
diff --git a/tools/testing/selftests/kvm/x86/sev_smoke_test.c b/tools/testing/selftests/kvm/x86/sev_smoke_test.c
index 6b2cbe2a90b7c..646ae93e3c461 100644
--- a/tools/testing/selftests/kvm/x86/sev_smoke_test.c
+++ b/tools/testing/selftests/kvm/x86/sev_smoke_test.c
@@ -178,7 +178,7 @@ static void test_sev(void *guest_code, u32 type, u64 policy)
 		case UCALL_SYNC:
 			continue;
 		case UCALL_DONE:
-			return;
+			goto done;
 		case UCALL_ABORT:
 			REPORT_GUEST_ASSERT(uc);
 		default:
@@ -187,6 +187,7 @@ static void test_sev(void *guest_code, u32 type, u64 policy)
 		}
 	}
 
+done:
 	kvm_vm_free(vm);
 }

3/2 2026/08/08 08:38 llm patch-evaluator
0m Model: 
gemini-3.1-pro-preview

Args: 
null

Results: 
null

Tokens: 
							input: 2333
							output: 68
							thoughts: 95

Thoughts: 
**WorthFuzzing=False: A Quick Assessment**

Okay, so I'm looking at this patch and immediately, my expert eye hones in on the target files: `tools/testing/selftests/kvm/x86/nx_huge_pages_test.c` and `tools/testing/selftests/kvm/x86/sev_smoke_test.c`.  These are *selftests*.  And not just any selftests, they're in the user-space "tools" directory.

This is critical. My understanding is that fuzzing should be reserved for kernel code, the stuff that's actually *running* and handling critical system operations. These selftests, while important for validation and debugging, are *not* part of the core kernel functionality.  They're user-space utilities for validating kernel behavior, but their own code won't introduce new kernel vulnerabilities.

Therefore, because this patch is modifying selftests, and specifically user-space selftests, I'm confident in saying that it doesn't affect the fuzzable surface. The kernel's behavior will not be changed here.  So, I will return `WorthFuzzing=false`. No fuzzing needed for this one.

4/2 2026/08/08 08:38 tool set-results
0m Args: 
{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies KVM selftests in tools/testing/selftests/, which are user-space testing tools and do not affect the kernel's functional execution flow.",
  "WorthFuzzing": false
}

Results: 
{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies KVM selftests in tools/testing/selftests/, which are user-space testing tools and do not affect the kernel's functional execution flow.",
  "WorthFuzzing": false
}
5/1 2026/08/08 08:38 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)