panic: trap type 6, code=10, pc=0
Starting stack trace...
panic(ffffffff827863e7) at panic+0x16f sys/kern/subr_prf.c:229
kerntrap(ffff8000211b8c10) at kerntrap+0x1d7 sys/arch/amd64/amd64/trap.c:336
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
0(fffffd8079a34f00,fffffd8079a34f00,0,fffffd8079a34f00,46a,0) at 0
softclock_process_kclock_timeout(fffffd8079a34f00,0) at softclock_process_kclock_timeout+0x1ca sys/kern/kern_timeout.c:666
softclock(0) at softclock+0x11a sys/kern/kern_timeout.c:717
softintr_dispatch(0) at softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90
Xsoftclock() at Xsoftclock+0x23
Xspllower() at Xspllower+0x1d
printf(ffffffff82773fcb) at printf+0x88 sys/kern/subr_prf.c:532
uvm_fault_unwire_locked(fffffd806efef578,a4496404000,a4496603000) at uvm_fault_unwire_locked+0x20c sys/uvm/uvm_fault.c:1679
uvm_unmap_kill_entry_withlock(fffffd806efef578,fffffd8067c2d268,0) at uvm_unmap_kill_entry_withlock+0x6b sys/uvm/uvm_map.c:1925
uvm_map_teardown(fffffd806efef578) at uvm_map_teardown+0x197 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline]
uvm_map_teardown(fffffd806efef578) at uvm_map_teardown+0x197 sys/uvm/uvm_map.c:2565
uvmspace_free(fffffd806efef578) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3503
reaper(ffff8000211ac578) at reaper+0x19a sys/kern/kern_exit.c:449
end trace frame: 0x0, count: 242
End of stack trace.

dump to dev 4,1 not possible
rpebooatinincg..:. 
kernel diagSeaBIOS (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 fe2172e1-0ae4-3e3c-d45b-fa0270c0bf41
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 0x000f2850: 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 3.56
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