kern.securelevel: 0 -> 1 creating runtime link editor directory cache. preserving editor files. starting network daemons: sshd. starting local daemons:. Thu Jan 31 20:44:48 PST 2019 OpenBSD/amd64 (ci-openbsd-multicore-6.c.syzkaller.internal) (tty00) Warning: Permanently added '10.128.0.156' (ECDSA) to the list of known hosts. 2019/01/31 20:45:23 parsed 1 programs 2019/01/31 20:45:29 executed programs: 0 login: witness: thread 0xffff800020b752c8 exiting with the following locks held: exclusive rrwlock inode r = 0 (0xfffffd806bbcc928) locked @ /syzkaller/managers/multicore/kernel/sys/ufs/ufs/ufs_vnops.c:1547 panic: thread 0xffff800020b752c8 cannot exit while holding sleeplocks Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 39170 83009 0 0x14000 0x200 1 reaper db_enter() at db_enter+0x18 panic() at panic+0x16c witness_thread_exit(16dd2bc53ae603fa) 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 0xffff800020b752c8 cannot exit while holding sleeplocks ddb{1}> trace db_enter() at db_enter+0x18 panic() at panic+0x16c witness_thread_exit(16dd2bc53ae603fa) 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 0xffff800020b67330 rbx 0xffff800020b673d0 rdx 0xffffffff81f323f3 cy_pio_rec+0x25c rcx 0x201 rax 0x1 r8 0xffffffff81d8b924 kprintf+0x174 r9 0x1 r10 0xb19e7f6ebcc25fe1 r11 0xda47be9ac092cb55 r12 0x3000000008 r13 0xffff800020b67340 r14 0x100 r15 0x1 rip 0xffffffff81202148 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020b67320 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (reaper) pid=39170 stat=onproc flags process=14000 proc=200 pri=4, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff800020b20e10,0xffff800020b219d8 process=0xffff800020b5b070 user=0xffff800020b62000, vmspace=0xffffffff822d2290 estcpu=1, cpticks=3, pctcpu=0.0 user=0, sys=2, intr=0 ddb{1}>