panic: trap type 4, code=0, pc=ffffffff812b0304
Starting stack trace...
panic(ffffffff8282b562) at panic+0x159 sys/kern/subr_prf.c:229
kerntrap(ffff80002a599030) at kerntrap+0x1c7 sys/arch/amd64/amd64/trap.c:327
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
__x86_indirect_thunk_r11() at __x86_indirect_thunk_r11+0x14
softclock_thread(ffff80002a58ccd0) at softclock_thread+0xc3 sys/kern/kern_timeout.c:814
end trace frame: 0x0, count: 252
End of stack trace.
syncing disks...23 14  done

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 016acda6-80d9-6675-f1e2-930bbf0c87d3
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 0x000f27f0: 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> 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