panic: vclean: deadlock

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: e24fbf55691f Add pool to allocate individual rtkit task ar..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=12432585980000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=a15c13ce8f5237c2d334

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/982a1d089c32/disk-e24fbf55.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/802160f45461/bsd-e24fbf55.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/59f7887ac187/kernel-e24fbf55.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a15c13...@syzkaller.appspotmail.com

login: panic: vclean: deadlock
Starting stack trace...
panic(ffffffff830e3e0b) at panic+0x1d0 sys/kern/subr_prf.c:229
vclean(fffffd805acbe648,8,ffff8000371b5470) at vclean+0x482 sys/kern/vfs_subr.c:1065
vgonel(fffffd805acbe648,ffff8000371b5470) at vgonel+0xec sys/kern/vfs_subr.c:1197
vcount(fffffd8064972bd8) at vcount+0x179 sys/kern/vfs_subr.c:1298
spec_close(ffff80002a154370) at spec_close+0xb8 sys/kern/spec_vnops.c:480
VOP_CLOSE(fffffd8064972bd8,1,fffffd807f7d3548,ffff8000371b5470) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156
vn_closefile(fffffd805ffd31e8,ffff8000371b5470) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd805ffd31e8,ffff8000371b5470) at vn_closefile+0x12b sys/kern/vfs_vnops.c:609
fdrop(fffffd805ffd31e8,ffff8000371b5470) at fdrop+0x126 sys/kern/kern_descrip.c:1274
closef(fffffd805ffd31e8,ffff8000371b5470) at closef+0x192 sys/kern/kern_descrip.c:1258
fdfree(ffff8000371b5470) at fdfree+0x116 sys/kern/kern_descrip.c:1190
exit1(ffff8000371b5470,0,0,1) at exit1+0x71b sys/kern/kern_exit.c:221
sys_exit(ffff8000371b5470,ffff80002a1546f0,ffff80002a154640) at sys_exit+0x1a
syscall(ffff80002a1546f0) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline]
syscall(ffff80002a1546f0) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7aa74109a580, count: 243
End of stack trace.


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup