syzbot


witness: reversal: fdlock inode (2)

Status: upstream: reported on 2025/10/24 12:15
Reported-by: syzbot+9a52a0c3fdd97cb9c223@syzkaller.appspotmail.com
First crash: 90d, last: 1d08h
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
openbsd witness: reversal: fdlock inode -1 4 220d 347d 0/3 auto-obsoleted due to no activity on 2025/09/15 07:18

Sample crash report:
witness: lock order reversal:
 1st 0xffff80003a7eb300 fdlock (&newfdp->fd_fd.fd_lock)
 2nd 0xfffffd806e8d30f0 inode (&ip->i_lock)
SYZFAIL: failed to recv rpc
fd=3 want=4 recv=0 n=-1 (errno 54: Connection reset by peer)



OpenBSD/amd64 (ci-openbsd-multicore-1.us-central1-b.c.syzkaller.internal) (tty00)

login: uvn_flush: obj=0xfffffd806eb33238, offset=0x3ff000.  error during pageout.
uvn_flush: WARNING: changes to page may be lost!
set $lines = 0
Password:
Login incorrect
login: show panic
Password:
Login incorrect
login: show registers
Password:
Login incorrect
login: ps
Password:
Login incorrect
show malloc
login: Password:
Login incorrect
machine ddbcpu 0
login: Password:
Login incorrect

Crashes (7):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/01/22 03:54 openbsd bf8f984edd8f 56f88057 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: fdlock inode
2026/01/22 02:59 openbsd bf8f984edd8f 56f88057 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: fdlock inode
2026/01/22 02:27 openbsd bf8f984edd8f 56f88057 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: fdlock inode
2026/01/22 02:01 openbsd bf8f984edd8f 56f88057 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: fdlock inode
2026/01/21 22:51 openbsd bf8f984edd8f 56f88057 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: fdlock inode
2026/01/21 20:41 openbsd bf8f984edd8f 56f88057 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: fdlock inode
2025/10/24 12:15 openbsd f7635e2c043a c0460fcd .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore witness: reversal: fdlock inode
* Struck through repros no longer work on HEAD.