panic: trap type 4, code=0, pc=ffffffff8260628f
Starting stack trace...
panic(ffffffff82823c6f) at panic+0x159 sys/kern/subr_prf.c:229
kerntrap(ffff8000377f53a0) at kerntrap+0x1c7 sys/arch/amd64/amd64/trap.c:327
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
ktrops(ffff80002f3567f8,deadbeefdeadbeef,0,c0001208,fffffd8056b64548,fffffd807f7d7410) at ktrops+0x4f ktrcanset sys/kern/kern_ktrace.c:718 [inline]
ktrops(ffff80002f3567f8,deadbeefdeadbeef,0,c0001208,fffffd8056b64548,fffffd807f7d7410) at ktrops+0x4f sys/kern/kern_ktrace.c:561
doktrace(fffffd8056b64548,4,40001208,0,ffff80002f3567f8) at doktrace+0x514 ktrsetchildren sys/kern/kern_ktrace.c:586 [inline]
doktrace(fffffd8056b64548,4,40001208,0,ffff80002f3567f8) at doktrace+0x514 sys/kern/kern_ktrace.c:508
sys_ktrace(ffff80002f3567f8,ffff8000377f57a0,ffff8000377f56f0) at sys_ktrace+0xd6 sys/kern/kern_ktrace.c:549
syscall(ffff8000377f57a0) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xa29815e8ca0, count: 249
End of stack trace.
syncing disks...22 10  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 0fee9609-1d66-d0cb-3385-b9d53e0469ef
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 $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