{
 "finding_id": "DF-3244",
 "status": "not_reproduced",
 "reproduced": 0,
 "impact": "none",
 "confidence": "certain",
 "verdict": "Same kernel-availability constraint as DF-3243 (stock: EOPNOTSUPP, #ifndef QUOTA). Line-accurate confirmation: ufs_quotactl executes if (vfs_busy(mp, LK_NOWAIT)) return (0); (ufs_vfsops.c:141-142) - Q_QUOTAON/Q_SETQUOTA/Q_QUOTAOFF silently no-op during unmount contention while quotaon(8)/replication tooling receives success. 4.4BSD heritage; FreeBSD propagates the error. Fix returns EBUSY; compiled in the F40FIX kernel (options QUOTA).",
 "exploit_chain": "",
 "evidence": "VERDICT.md with path:line citations; run.log where a live demo exists; fix.diff",
 "kernel_refs": [
  "sys/vfs/ufs/ufs_vfsops.c:141",
  "sys/vfs/ufs/ufs_vfsops.c:142"
 ],
 "poc_changes": "n/a - see DF-3243",
 "attempts": 0,
 "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": 5,
 "guest_dirty": 0,
 "build_cmd": "see build.sh",
 "run_cmd": "see run.sh",
 "code_hash": null,
 "notes": "",
 "recommended_fix": "return EBUSY instead of 0 when vfs_busy(LK_NOWAIT) fails",
 "fix_status": "compile_validated",
 "fix_verdict": "compiled in the QUOTA-enabled F40FIX kernel; not runtime-exercised (vfs_busy contention window not attempted). Code-certain two-liner: return EBUSY instead of silently succeeding."
}