panic: bad dir
Starting stack trace...
panic(ffffffff827b4b03) at panic+0x159 sys/kern/subr_prf.c:229
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(fffffd807abbd888,ffff8000216ef518,ffff8000216ef548) at VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85
vfs_lookup(ffff8000216ef4e8) at vfs_lookup+0x6dc sys/kern/vfs_lookup.c:566
namei(ffff8000216ef4e8) at namei+0x55a sys/kern/vfs_lookup.c:250
vn_open(ffff8000216ef4e8,1,0) at vn_open+0xf8 sys/kern/vfs_vnops.c:140
doopenat(ffff80002314baa0,ffffff9c,20000040,0,0,ffff8000216ef6c0) at doopenat+0x26e sys/kern/vfs_syscalls.c:1126
syscall(ffff8000216ef740) at syscall+0x4a8 sys/arch/amd64/amd64/trap.c:623
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xb16152ee730, count: 248
End of stack trace.
syncing disks...40 23 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3  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 8a8635c2-f252-d190-235a-0f50a6ed73cd
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 0x000f2890: 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 3.65
boot> machine ddbcpu 0
machine: syntax error
boot> trace
|/-\|/-\|/booting hd0a:trace: -\|/open hd0a:trace: No such file or directory
 failed(2). will try /bsd
boot> machine ddbcpu 1
machine: syntax error
boot> trace