panic: trap type 6, code=10, pc=0
Starting stack trace...
panic(ffffffff82825c84) at panic+0x159 sys/kern/subr_prf.c:229
kerntrap(ffff80002a6af110) at kerntrap+0x1c7 sys/arch/amd64/amd64/trap.c:327
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
0(b,ffff80002a6af2d8,83,ffff80002a6af378,0,b) at 0
rt_match(ffff80002a6af3e0,0,1,0) at rt_match+0xc3 rt_clone sys/net/route.c:383 [inline]
rt_match(ffff80002a6af3e0,0,1,0) at rt_match+0xc3 sys/net/route.c:358
ip_multicast_if(ffff80002a6af490,0,ffff80002a6af478) at ip_multicast_if+0xec sys/netinet/ip_output.c:1364
ip_setmoptions(c,fffffd806b135c20,fffffd807279a100,0) at ip_setmoptions+0x378 sys/netinet/ip_output.c:1533
sosetopt(fffffd8074707a10,0,c,fffffd807279a100) at sosetopt+0xe1
sys_setsockopt(ffff80002a679730,ffff80002a6af6a0,ffff80002a6af5f0) at sys_setsockopt+0x1d6 sys/kern/uipc_syscalls.c:1231
syscall(ffff80002a6af6a0) at syscall+0x72a sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xe256b6de5c0, count: 246
End of stack trace.

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 860ebdd0-427f-2be6-5726-fd56b385017a
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