kern.securelevel: 0 -> 1
creating runtime link editor directory cache.
preserving editor files.
starting network daemons: sshd.
starting local daemons:.
Mon Jan 28 07:23:15 PST 2019

OpenBSD/amd64 (ci-openbsd-setuid-6.c.syzkaller.internal) (tty00)

Warning: Permanently added '10.128.10.37' (ECDSA) to the list of known hosts.
2019/01/28 07:24:08 parsed 1 programs
2019/01/28 07:24:13 executed programs: 0
2019/01/28 07:24:18 executed programs: 96
login: witness: thread 0xffff800020be4268 exiting with the following locks held:

exclusive rrwlock inode r = 0 (0xfffffd806b31c4e8) locked @ /syzkaller/managers/setuid/kernel/sys/ufs/ufs/ufs_vnops.c:1547

panic: thread 0xffff800020be4268 cannot exit while holding sleeplocks

Stopped at      db_enter+0x18:  addq    $0x8,%rsp

    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND

 405567  56893     73    0x100010          0    1  syslogd

*422834  51881      0     0x14000      0x200    0  reaper

db_enter() at db_enter+0x18

panic() at panic+0x16c

witness_thread_exit(93812e3b12a97f69) 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{0}> 

ddb{0}> set $lines = 0

ddb{0}> show panic

thread 0xffff800020be4268 cannot exit while holding sleeplocks

ddb{0}> trace

db_enter() at db_enter+0x18

panic() at panic+0x16c

witness_thread_exit(93812e3b12a97f69) at witness_thread_exit+0x244

reaper(0) at reaper+0x14f

end trace frame: 0x0, count: -4

ddb{0}>