panic: ufsdirhash_lookup: bad offset in hash array
Starting stack trace...
panic(ffffffff82850008) at panic+0x159 sys/kern/subr_prf.c:229
ufsdirhash_lookup(fffffd80593141e8,ffff800021723400,1,fffffd8059314294,ffff80002e868048,0) at ufsdirhash_lookup+0x8b8 sys/ufs/ufs/ufs_dirhash.c:343
ufs_lookup() at ufs_lookup+0xc15 sys/ufs/ufs/ufs_lookup.c:216
VOP_LOOKUP(fffffd807775d638,ffff80002e8684c8,ffff80002e8684f8) at VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85
vfs_lookup(ffff80002e868498) at vfs_lookup+0x6dc sys/kern/vfs_lookup.c:566
namei(ffff80002e868498) at namei+0x55a sys/kern/vfs_lookup.c:250
vn_open(ffff80002e868498,201,40) at vn_open+0x17b sys/kern/vfs_vnops.c:107
doopenat(ffff8000216e6298,4,20000240,200,40,ffff80002e868670) at doopenat+0x26e sys/kern/vfs_syscalls.c:1126
syscall(ffff80002e8686f0) at syscall+0x4a8 sys/arch/amd64/amd64/trap.c:623
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x652d20feb00, count: 247
End of stack trace.
syncing disks...22 10 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1  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 860ebdd0-427f-2be6-5726-fd56b385017a
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 0x000f2820: 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> show malloc
boot: illegal argument malloc
boot> show all pools
boot> machine ddbcpu 0
machine: syntax error
boot> trace
boot> machine ddbcpu 1
machine: syntax error
boot> trace