panic: trap type 6, code=10, pc=3c729
Starting stack trace...
panic(ffffffff8282991a) at panic+0x159 sys/kern/subr_prf.c:229
kerntrap(ffff80002a69c550) at kerntrap+0x1c7 sys/arch/amd64/amd64/trap.c:327
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
acpi_pdirpa() at acpi_pdirpa+0x2859a
rt_match(ffff80002a69c830,0,1,0) at rt_match+0xc3 rt_clone sys/net/route.c:383 [inline]
rt_match(ffff80002a69c830,0,1,0) at rt_match+0xc3 sys/net/route.c:358
icmp_reflect(fffffd807e074b00,0,0) at icmp_reflect+0x1ca sys/netinet/ip_icmp.c:740
icmp_error(fffffd807e074c00,3,5,0,0) at icmp_error+0x61 sys/netinet/ip_icmp.c:300
ip_dooptions(fffffd807e074c00,ffff800000dd9000) at ip_dooptions+0x87c ipstat_inc sys/netinet/ip_var.h:151 [inline]
ip_dooptions(fffffd807e074c00,ffff800000dd9000) at ip_dooptions+0x87c sys/netinet/ip_input.c:1381
ip_input_if(ffff80002a69cac8,ffff80002a69cad4,ffff80002f134000,0,ffff800000dd9000) at ip_input_if+0x1d3 sys/netinet/ip_input.c:475
ipv4_input(ffff800000dd9000,fffffd807e074c00) at ipv4_input+0x47 sys/netinet/ip_input.c:327
ether_input(ffff800000dd9000,fffffd807e074c00) at ether_input+0x525
tun_dev_write(5d07,ffff80002a69ce48,ffff80002f134000,2) at tun_dev_write+0x209 sys/net/if_tun.c:914
spec_write(ffff80002a69cca0) at spec_write+0xd8 sys/kern/spec_vnops.c:302
VOP_WRITE(fffffd807d9167a0,ffff80002a69ce48,11,fffffd807f7d76e8) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
vn_write(fffffd806d1789e8,ffff80002a69ce48,0) at vn_write+0x157 sys/kern/vfs_vnops.c:408
dofilewritev(ffff80002a6b8548,c8,ffff80002a69ce48,0,ffff80002a69cf00) at dofilewritev+0x1a9 sys/kern/sys_generic.c:375
sys_write(ffff80002a6b8548,ffff80002a69cfb0,ffff80002a69cf00) at sys_write+0x87 sys/kern/sys_generic.c:295
syscall(ffff80002a69cfb0) at syscall+0x72a sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f10eaa5bc0, count: 238
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