DF-3013 / verdict.json
{ "finding_id": "DF-3013", "status": "not_reproduced", "reproduced": 0, "impact": "none", "confidence": "speculative", "verdict": "90-second hammer stress on a fresh HAMMER1 volume: 4 writer threads (create/write/fsync/unlink, 130,347 ops) racing 4 readdir threads with 5 concurrent hammer reblock+prune passes. No panic; clean unmount. The EDEADLK-during-reseek window is real in the code (hammer_object.c:1493 KKASSERT(error==0) after _hammer_ip_seek_btree) but was not crossed under this load on a 6-vCPU INVARIANTS guest.", "exploit_chain": "", "evidence": "VERDICT.md + run.log + sources", "kernel_refs": [ "sys/vfs/hammer/hammer_object.c:1493", "sys/vfs/hammer/hammer_btree.c:869", "sys/vfs/hammer/hammer_object.c:1568" ], "poc_changes": "adjusted from finding sketch to guest syscall/layout reality", "attempts": 1, "guest_uname": "DragonFly dfbsd 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": 100, "guest_dirty": 0, "build_cmd": "guest: cc -O2 -o <bin> <src>.c -pthread", "run_cmd": "see README.md", "code_hash": "1428fe6c1527d1c16da5c0171864281580d27741ac3f1f216f0daea3fda5b938", "notes": "fix_status: not_testable (not reproduced)", "recommended_fix": "diff: handle EDEADLK in _hammer_ip_reseek (leave HAMMER_CURSOR_DISKEOF|ATEDISK cleared, propagate error to hammer_ip_next callers retry protocol) mirroring hammer_ip_first (:1568-1570).\n" } |