{
  "finding_id": "DF-4884",
  "verdict": "not_reproduced",
  "impact": "none",
  "reason": "target hardware absent on audit guest (no AMD PCI device; amdgpu never probes). Bug proven by exhaustive source trace — see VERDICT.md.",
  "reproduce": {
    "build": "nothing to build on this guest; on AMD hardware the trigger is the amdgpu driver probe itself",
    "run": "./trigger.sh  (precondition check); real trigger: AMD GPU whose VBIOS fails all six read methods, then boot or kldload amdgpu",
    "expected": "on satisfying hardware: 'Unable to locate a BIOS ROM' + double-free of adev->bios in amdgpu_device_fini teardown (heap corruption/panic); on this guest: precondition ABSENT"
  },
  "kernel_refs": [
    "sys/dev/drm/amd/amdgpu/amdgpu_bios.c:116",
    "sys/dev/drm/amd/amdgpu/amdgpu_bios.c:145",
    "sys/dev/drm/amd/amdgpu/amdgpu_bios.c:185",
    "sys/dev/drm/amd/amdgpu/amdgpu_bios.c:354",
    "sys/dev/drm/amd/amdgpu/amdgpu_bios.c:428",
    "sys/dev/drm/amd/amdgpu/amdgpu_bios.c:446",
    "sys/dev/drm/amd/amdgpu/amdgpu_device.c:2473",
    "sys/dev/drm/amd/amdgpu/amdgpu_device.c:2536",
    "sys/dev/drm/amd/amdgpu/amdgpu_device.c:2762",
    "sys/dev/drm/amd/amdgpu/amdgpu_kms.c:99",
    "sys/dev/drm/amd/amdgpu/amdgpu_kms.c:239",
    "sys/dev/drm/amd/amdgpu/cik.c:922",
    "sys/dev/drm/amd/amdgpu/vi.c:406",
    "sys/dev/drm/amd/amdgpu/soc15.c:236"
  ],
  "artifacts": [
    "README.md", "VERDICT.md", "trigger.sh", "run.log", "env.txt",
    "fix.diff", "manifest.json", "verdict.json"
  ]
}