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}>