panic: trap type 4, code=0, pc=ffffffff81d1031f
Starting stack trace...
panic(ffffffff82850f81) at panic+0x16f sys/kern/subr_prf.c:229
kerntrap(ffff8000319123b0) at kerntrap+0x1d7 sys/arch/amd64/amd64/trap.c:327
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
ktrops(ffff80002a1579f0,deaf4152deaf4152,0,a0c7df9b,fffffd80674e36d8,fffffd807f7d7680) at ktrops+0x4f ktrcanset sys/kern/kern_ktrace.c:718 [inline]
ktrops(ffff80002a1579f0,deaf4152deaf4152,0,a0c7df9b,fffffd80674e36d8,fffffd807f7d7680) at ktrops+0x4f sys/kern/kern_ktrace.c:561
doktrace(fffffd80674e36d8,4,20c7df9b,0,ffff80002a1579f0) at doktrace+0x514 ktrsetchildren sys/kern/kern_ktrace.c:586 [inline]
doktrace(fffffd80674e36d8,4,20c7df9b,0,ffff80002a1579f0) at doktrace+0x514 sys/kern/kern_ktrace.c:508
sys_ktrace(ffff80002a1579f0,ffff8000319127c0,ffff800031912710) at sys_ktrace+0xd6 sys/kern/kern_ktrace.c:549
syscall(ffff8000319127c0) at syscall+0x854 mi_syscall sys/sys/syscall_mi.h:180 [inline]
syscall(ffff8000319127c0) at syscall+0x854 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd6facaa8110, count: 249
End of stack trace.
syncing disks...25 10 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2  giving up

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 389fa873-dfcb-7256-506e-5266d86d0b3b
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> show malloc
boot: illegal argument malloc
boot> show all pools
boot> machine ddbcpu 0
machine: syntax error
boot> trace
boot> machine ddbcpu 1
machine: syntax error
boot> trace