kern.securelevel: 0 -> 1 creating runtime link editor directory cache. preserving editor files. starting network daemons: sshd. starting local daemons:. Tue Jan 29 10:31:40 PST 2019 OpenBSD/amd64 (ci-openbsd-multicore-3.c.syzkaller.internal) (tty00) Warning: Permanently added '10.128.0.25' (ECDSA) to the list of known hosts. 2019/01/29 10:32:16 parsed 1 programs 2019/01/29 10:32:22 executed programs: 0 login: witness: thread 0xffff800020b74710 exiting with the following locks held: exclusive rrwlock inode r = 0 (0xfffffd807a7075f8) locked @ /syzkaller/managers/multicore/kernel/sys/ufs/ufs/ufs_vnops.c:1547 panic: thread 0xffff800020b74710 cannot exit while holding sleeplocks Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *433001 56714 0 0x14000 0x200 1 reaper db_enter() at db_enter+0x18 panic() at panic+0x16c witness_thread_exit(857a20be048d9345) at witness_thread_exit+0x244 reaper(0) at reaper+0x14f end trace frame: 0x0, count: 11 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{1}> ddb{1}> set $lines = 0 ddb{1}> show panic thread 0xffff800020b74710 cannot exit while holding sleeplocks ddb{1}> trace db_enter() at db_enter+0x18 panic() at panic+0x16c witness_thread_exit(857a20be048d9345) at witness_thread_exit+0x244 reaper(0) at reaper+0x14f end trace frame: 0x0, count: -4 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020b67510 rbx 0xffff800020b675b0 rdx 0xffffffff81f2fa3a apollo_pio_rec+0x9e58 rcx 0x201 rax 0x1 r8 0xffffffff8134b1f4 kprintf+0x174 r9 0x1 r10 0x164dab4744acdf5a r11 0xdbc23b96c1644558 r12 0x3000000008 r13 0xffff800020b67520 r14 0x100 r15 0x1 rip 0xffffffff8176ba08 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020b67500 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}>