witness: thread exiting with locks held (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: a4a82b864d54 Remove PIPEXCSESSION ioctl(2) call only from ..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=16dd645bf00000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=07b70cc7acb6ddff7134

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+07b70c...@syzkaller.appspotmail.com

witness: thread 0xffff8000212a4008 exiting with the following locks held:
exclusive rwlock solock r = 0 (0xfffffd8069515028)
#0 witness_lock+0x44d
#1 unp_solock_peer+0x64 sys/kern/uipc_usrreq.c:168
#2 uipc_usrreq+0x7c6 sys/kern/uipc_usrreq.c:350
#3 sosend+0x61b sys/kern/uipc_socket.c:657
#4 sendit+0x65d sys/kern/uipc_syscalls.c:682
#5 sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:589
#6 syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline]
#6 syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585
#7 Xsyscall+0x128
panic: thread 0xffff8000212a4008 cannot exit while holding sleeplocks
Starting stack trace...
panic(ffffffff825be0d3) at panic+0x16b sys/kern/subr_prf.c:233
witness_thread_exit(ffff8000212a4008) at witness_thread_exit+0x32c sys/kern/subr_witness.c:1396
reaper(ffff8000212337a8) at reaper+0x15b sys/kern/kern_exit.c:435
end trace frame: 0x0, count: 254
End of stack trace.


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[Anton Lindqvist]

#syz dup: witness: userret: sendmsg