{
  "finding_id": "DF-3814",
  "status": "inconclusive",
  "reproduced": 0,
  "impact": "none",
  "confidence": "certain",
  "verdict": "Source-certain: a reallocating diag reset (facts changed, mpr.c:551-576) calls mpr_iocfacts_free() (mpr.c:631) which tears down every interrupt handler via mpr_pci_free_interrupts() (mpr.c:801 -> mpr_pci.c:340-348), but re-establishment mpr_pci_setup_interrupts() is gated on attaching (mpr.c:718) and mpr_reinit() runs with attaching=FALSE (mpr.c:861) \u2014 so after such a reset the controller has no completion interrupts for the rest of the system lifetime; mpr_unmask_intr() (mpr.c:879) then enables signaling into a torn-down handler set. Result: hangs (config-page waiters sleep forever via timeout=0 at mpr.c:3740) or panics (mpr.c:846/862) \u2014 a controller/host DoS. Runtime inconclusive: guest has the driver compiled in (142 pci/mpr) but no SAS3 controller (probe.log).",
  "exploit_chain": "",
  "evidence": "VERDICT.md (6-step trace); probe.log (driver present, device absent); fix.diff (gate setup on attaching||reallocating).",
  "kernel_refs": [
    "sys/dev/raid/mpr/mpr.c:718",
    "sys/dev/raid/mpr/mpr.c:801",
    "sys/dev/raid/mpr/mpr_pci.c:340-348"
  ],
  "poc_changes": "No runnable PoC exists without hardware; probe-based verification only.",
  "attempts": 1,
  "guest_uname": "DragonFly dfbsd 6.5-DEVELOPMENT DragonFly 6.5-DEVELOPMENT #0: Thu Jul  2 06:02:54 UTC 2026  root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64",
  "runtime_sec": 15,
  "guest_dirty": 0,
  "build_cmd": "",
  "run_cmd": "",
  "notes": "Same defect pattern exists in the FreeBSD-origin code; upstream-shared.",
  "recommended_fix": "In mpr_iocfacts_allocate(), call mpr_pci_setup_interrupts() when (attaching || reallocating).",
  "fix_status": "not_testable",
  "fix_baseline_reproduced": 0,
  "fix_patched_reproduced": 0,
  "fix_verdict": "No SAS3 hardware on the guest: neither baseline nor single-fix kernel can exercise the reinit interrupt path; fix.diff authored against read-only sys/, not applied.",
  "fix_evidence": "fix.diff; probe.log."
}