panic: trap type 6, code=0, pc=ffffffff81e3f268
Starting stack trace...
panic(ffffffff834b553b) at panic+0x1ba sys/kern/subr_prf.c:229
kerntrap(ffff80003c8f5260) at kerntrap+0x2fb
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
dovutimens(ffff80002f0b0018,ffffee006c9c76c8,ffff80003c8f5440) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2690
sys_futimes(ffff80002f0b0018,ffff80003c8f5580,ffff80003c8f54d0) at sys_futimes+0x208 sys/kern/vfs_syscalls.c:2732
syscall(ffff80003c8f5580) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003c8f5580) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x3514dbf08b0, count: 250
End of stack trace.

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 d80dd95b-5098-cdda-4d96-970525b79916
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 0x000f2600: 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 3.67
boot> set $lines = 0
set: syntax error
boot> set $maxwidth = 0
set: syntax error
boot> show panic
boot: illegal argument panic
boot> trace
boot> show registers
boot> show proc
boot> ps
boot> show all locks
boot> show malloc
boot> show all pools
boot> machine ddbcpu 0
machine: syntax error
boot> trace
boot> machine ddbcpu 1
machine: syntax error
boot> trace