panic: bad dir
Starting stack trace...
panic(ffffffff8259aa6e) at panic+0x155 sys/kern/subr_prf.c:233
ufs_lookup() at ufs_lookup+0x1749 ufs_dirbad sys/ufs/ufs/ufs_lookup.c:609 [inline]
ufs_lookup() at ufs_lookup+0x1749 sys/ufs/ufs/ufs_lookup.c:444
VOP_LOOKUP(fffffd805f7a3430,ffff800029b60fa8,ffff800029b60fd8) at VOP_LOOKUP+0x58 sys/kern/vfs_vops.c:85
vfs_lookup(ffff800029b60f78) at vfs_lookup+0x6cc sys/kern/vfs_lookup.c:561
namei(ffff800029b60f78) at namei+0x36a sys/kern/vfs_lookup.c:245
dounlinkat(ffff8000215f07e0,ffffff9c,7f7ffffc27c0,0) at dounlinkat+0x99 sys/kern/vfs_syscalls.c:1850
syscall(ffff800029b61150) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffc2c70, count: 249
End of stack trace.
syncing disks...28 21 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2  giving up

dump to dev 4,1 not possible
rebooting...
SeaBIOS (version 1.8.2-google)
Total RAM Size = 0x0000000080000000 = 2048 MiB
CPUs found: 2     Max CPUs supported: 2
SeaBIOS (version 1.8.2-google)
Machine UUID 7bbb59a4-3b4e-2ed3-58f8-154d5cc405f8
found virtio-scsi at 0:3
virtio-scsi vendor='Google' product='PersistentDisk' rev='1' type=0 removable=0
virtio-scsi blksize=512 sectors=4194304 = 2048 MiB
drive 0x000f2730: PCHS=0/0/0 translation=lba LCHS=520/128/63 s=4194304
Sending Seabios boot VM event.
Booting from Hard Disk 0...
>> OpenBSD/amd64 BOOT 3.53