⬢ DragonFlyBSD Kernel Audit
DF-4437 / manifest.json
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{
  "finding_id": "DF-4437",
  "verdict": "untested",
  "impact": "none",
  "severity": "Low",
  "confidence": "likely",
  "title": "drm_mode_page_flip_ioctl: -EDEADLK retry bypasses the only drm_crtc_vblank_put - one vblank reference leaked per successfully retried flip (DRM_MASTER local; latent trigger on stock DF)",
  "reproduce": {
    "build": "n/a - needs radeon or pre-DC amdgpu GPU plus a ww-modeset-lock inversion producer; guest has no DRM device",
    "run": "n/a",
    "expected": "On affected hw+driver: concurrent DRM_IOCTL_MODE_PAGE_FLIP racing a modeset-lock inverter; each EDEADLK-then-success iteration increments vblank refcount permanently (IRQ never disabled, counter never returns to 0)"
  },
  "kernel_refs": [
    "sys/dev/drm/drm_plane.c:1053",
    "sys/dev/drm/drm_plane.c:1186",
    "sys/dev/drm/drm_plane.c:1195",
    "sys/dev/drm/radeon/radeon_display.c:666",
    "sys/dev/drm/amd/amdgpu/amdgpu_display.c:146"
  ],
  "artifacts": [
    "README.md",
    "VERDICT.md",
    "verdict.json",
    "manifest.json",
    "fix.diff",
    "env.txt"
  ]
}