panic: trap type 6, code=10, pc=0
Starting stack trace...
panic(ffffffff8279f1b2) at panic+0x16f sys/kern/subr_prf.c:229
kerntrap(ffff80002b1d2e20) at kerntrap+0x1d7 sys/arch/amd64/amd64/trap.c:327
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
0(fffffd805f183d68,fffffd805f183d68,0,fffffd805f183d68,3bc,0) at 0

softclock_process_kclock_timeout(fffffd805f183d68,0) at softclock_process_kclock_timeout+0x1d7 sys/kern/kern_timeout.c:695
softclock(0) at softclock+0x11a sys/kern/kern_timeout.c:754
softintr_dispatch(0) at softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90
Xsoftclock() at Xsoftclock+0x27
end of kernel
end trace frame: 0x7246d3bce5d0, count: 249
End of stack trace.

dump to dev 4,1 not possible
rpeabnoioct:i nkger.n..el
 diagnostic aSeaBIOS (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 479bd2e4-6073-186a-8c25-a69e4074584d
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> 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