{
  "finding_id": "DF-5172",
  "title": "vcdstrategy() drains sc->bio_queue unlocked (latent SMP race; shielded today by the mplock via missing D_MPSAFE)",
  "verdict": "not_reproduced",
  "impact": "none",
  "reproduce": {
    "build": "cc -static -O2 -o race src/vcd_race_poc.c (guest; harness per DF-5171)",
    "run": "./vkernel64 -m 256M -n 4 -r root.img -c hammer.img -e init_path=/race",
    "expected": "clean survival ('RACE SURVIVED - no crash this run') - the race is impossible while vcd_ops lacks D_MPSAFE; the pack documents the shield and the trigger condition for it dropping"
  },
  "kernel_refs": [
    "sys/dev/virtual/vkernel/cdrom/vcd.c:148",
    "sys/dev/virtual/vkernel/cdrom/vcd.c:67",
    "sys/kern/kern_device.c:384",
    "sys/dev/virtual/vkernel/disk/vdisk.c:228"
  ],
  "artifacts": [
    "README.md", "VERDICT.md", "vcd_race_poc.c", "odcat.c", "guest_prep.sh",
    "run.log", "run.2.log", "run.s2-failed.log", "run.s3-failed.log",
    "env.txt", "manifest.json", "verdict.json"
  ]
}