panic: trap type 6, code=10, pc=0
Starting stack trace...
panic(ffffffff82850168) at panic+0x16f sys/kern/subr_prf.c:229
kerntrap(ffff800037397690) at kerntrap+0x1d7 sys/arch/amd64/amd64/trap.c:327
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
0(b,ffff800037397858,3,ffff8000373978f8,0,b) at 0
rt_clone(ffff800037397968,ffff8000373979e0,0) at rt_clone+0x7d sys/net/route.c:383
rtalloc(ffff8000373979e0,1,0) at rtalloc+0x89 rt_match sys/net/route.c:360 [inline]
rtalloc(ffff8000373979e0,1,0) at rtalloc+0x89 sys/net/route.c:489
icmp_reflect(fffffd8068de3600,0,0) at icmp_reflect+0x1ca sys/netinet/ip_icmp.c:740
icmp_error(fffffd806754e300,3,3,0,0) at icmp_error+0x61 sys/netinet/ip_icmp.c:300
pf_test_rule(ffff800037397c78,ffff800037397d70,ffff800037397d78,ffff800037397d60,ffff800037397d50,2) at pf_test_rule+0x924
pf_test(2,1,ffff800000e27800,ffff800037397ee8) at pf_test+0x194f sys/net/pf.c:7680
ip_input_if(ffff800037397ee8,ffff800037397ef4,ffff800033569000,0,ffff800000e27800) at ip_input_if+0x133 sys/netinet/ip_input.c:457
ipv4_input(ffff800000e27800,fffffd8069617800) at ipv4_input+0x47 sys/netinet/ip_input.c:327
ether_input(ffff800000e27800,fffffd8069617800) at ether_input+0x525
tun_dev_write(5d05,ffff800037398268,ffff800033569000,2) at tun_dev_write+0x209 sys/net/if_tun.c:914
spec_write(ffff8000373980c0) at spec_write+0xe1 sys/kern/spec_vnops.c:302
VOP_WRITE(fffffd80673a3970,ffff800037398268,11,fffffd807f7d7618) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
vn_write(fffffd806d69a998,ffff800037398268,0) at vn_write+0x15c sys/kern/vfs_vnops.c:408
dofilewritev(ffff80002bc9a2c8,c8,ffff800037398268,0,ffff800037398320) at dofilewritev+0x1a9 sys/kern/sys_generic.c:375
sys_write(ffff80002bc9a2c8,ffff8000373983d0,ffff800037398320) at sys_write+0x87 sys/kern/sys_generic.c:295
syscall(ffff8000373983d0) at syscall+0x8cf mi_syscall sys/sys/syscall_mi.h:180 [inline]
syscall(ffff8000373983d0) at syscall+0x8cf sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xe6966a017a0, count: 236
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 f8e08a03-81bc-3227-53c0-939594373760
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