AI Trajectory

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{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "KMSANReasoning": "",
  "NeedsKMSAN": false,
  "Reasoning": "The patch only modifies tools/testing/selftests/kvm/Makefile.kvm, which is a userspace selftest build Makefile and does not affect the Linux kernel itself.",
  "WorthFuzzing": false
}

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{
  "PatchDiff": "commit 79ffc99d742a01a7c54fce5bc5e8b411a7b8b65a\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Wed Sep 2 18:34:23 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/tools/testing/selftests/kvm/Makefile.kvm b/tools/testing/selftests/kvm/Makefile.kvm\nindex 6fc34e9bf8e1b..46c54948f4b16 100644\n--- a/tools/testing/selftests/kvm/Makefile.kvm\n+++ b/tools/testing/selftests/kvm/Makefile.kvm\n@@ -297,6 +297,11 @@ CFLAGS += -I$(GEN_HDRS)\n $(GEN_HDRS): $(wildcard $(arm64_tools_dir)/*)\n \t$(MAKE) -C $(arm64_tools_dir) OUTPUT=$(arm64_hdr_outdir)\n endif\n+ifeq ($(ARCH),riscv)\n+ifeq ($(shell echo \"void foo(void) { }\" | $(CC) -march=rv64gc -x c - -c -o /dev/null 2\u003e/dev/null; echo \"$$?\"),0)\n+\tCFLAGS += -march=rv64gc\n+endif\n+endif\n \n no-pie-option := $(call try-run, echo 'int main(void) { return 0; }' | \\\n         $(CC) -Werror $(CFLAGS) -no-pie -x c - -o \"$$TMP\", -no-pie)\n"
}

core

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{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies tools/testing/selftests/kvm/Makefile.kvm, which is a userspace selftest build Makefile and does not affect the Linux kernel itself.",
  "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).
- 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.

For your convenience, here is the diff of the changes:
commit 79ffc99d742a01a7c54fce5bc5e8b411a7b8b65a
Author: syz-cluster <triage@syzkaller.com>
Date:   Wed Sep 2 18:34:23 2026 +0000

    syz-cluster: applied patch under review

diff --git a/tools/testing/selftests/kvm/Makefile.kvm b/tools/testing/selftests/kvm/Makefile.kvm
index 6fc34e9bf8e1b..46c54948f4b16 100644
--- a/tools/testing/selftests/kvm/Makefile.kvm
+++ b/tools/testing/selftests/kvm/Makefile.kvm
@@ -297,6 +297,11 @@ CFLAGS += -I$(GEN_HDRS)
 $(GEN_HDRS): $(wildcard $(arm64_tools_dir)/*)
 	$(MAKE) -C $(arm64_tools_dir) OUTPUT=$(arm64_hdr_outdir)
 endif
+ifeq ($(ARCH),riscv)
+ifeq ($(shell echo "void foo(void) { }" | $(CC) -march=rv64gc -x c - -c -o /dev/null 2>/dev/null; echo "$$?"),0)
+	CFLAGS += -march=rv64gc
+endif
+endif
 
 no-pie-option := $(call try-run, echo 'int main(void) { return 0; }' | \
         $(CC) -Werror $(CFLAGS) -no-pie -x c - -o "$$TMP", -no-pie)

gemini-3.7-flash

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							input: 2199
							output: 69
							thoughts: 332
						

**My Assessment of the Patch's Fuzzing Worthiness**

Okay, so the only file this patch touches is `tools/testing/selftests/kvm/Makefile.kvm`. That immediately raises a flag for me. It's a userspace selftest Makefile, which means it's *not* kernel source. Let's make absolutely sure there aren't any other sneaky changes hiding somewhere, but I'm betting this is a targeted modification.

Now, let's go back and apply our rulebook. We know the key phrase is "reachable core kernel logic," so it's a no-brainer here. Specifically, the rules state that changes to `tools/` build scripts are not kernel code and do not modify the kernel binary or logic. Consequently, I will confirm, WorthFuzzing = false.

I will now invoke `set-results`.

{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies tools/testing/selftests/kvm/Makefile.kvm, which is a userspace selftest build Makefile and does not affect the Linux kernel itself.",
  "WorthFuzzing": false
}

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch only modifies tools/testing/selftests/kvm/Makefile.kvm, which is a userspace selftest build Makefile and does not affect the Linux kernel itself.",
  "WorthFuzzing": false
}

{
  "WorthFuzzing": false
}

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