panic: trap type 4, code=0, pc=ffffffff81c4e314
Starting stack trace...
panic(ffffffff82825ce9) at panic+0x159 sys/kern/subr_prf.c:229
kerntrap(ffff80002f52ab80) at kerntrap+0x1c7 sys/arch/amd64/amd64/trap.c:327
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
__x86_indirect_thunk_r11() at __x86_indirect_thunk_r11+0x14
rt_match(ffff80002f52ae58,fffffd80694312ec,1,0) at rt_match+0xc3 rt_clone sys/net/route.c:351 [inline]
rt_match(ffff80002f52ae58,fffffd80694312ec,1,0) at rt_match+0xc3 sys/net/route.c:326
in_ouraddr(fffffd8069431200,ffff800000dd3000,ffff80002f52aee8) at in_ouraddr+0xab sys/netinet/ip_input.c:779
ip_input_if(ffff80002f52af98,ffff80002f52afa4,ffff80002dcf8000,0,ffff800000dd3000) at ip_input_if+0x29b sys/netinet/ip_input.c:448
ipv4_input(ffff800000dd3000,fffffd8069431200) at ipv4_input+0x47 sys/netinet/ip_input.c:290
ether_input(ffff800000dd3000,fffffd8069431200) at ether_input+0x525
tun_dev_write(5d07,ffff80002f52b318,ffff80002dcf8000,2) at tun_dev_write+0x209 sys/net/if_tun.c:914
spec_write(ffff80002f52b170) at spec_write+0xd8 sys/kern/spec_vnops.c:302
VOP_WRITE(fffffd80613d8b08,ffff80002f52b318,11,fffffd807f7d7820) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
vn_write(fffffd80674cf9f0,ffff80002f52b318,0) at vn_write+0x157 sys/kern/vfs_vnops.c:408
dofilewritev(ffff80002a642d48,c8,ffff80002f52b318,0,ffff80002f52b3c0) at dofilewritev+0x1ac sys/kern/sys_generic.c:375
sys_write(ffff80002a642d48,ffff80002f52b470,ffff80002f52b3c0) at sys_write+0x87 sys/kern/sys_generic.c:295
syscall(ffff80002f52b470) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xbcc8c14f5f0, count: 240
End of stack trace.
syncing disks...panic: ffs_update: bad link cnt
Starting stack trace...
panic(ffffffff828b8a4a) at panic+0x159 sys/kern/subr_prf.c:229
ffs_update(fffffd806e79e1f0,0) at ffs_update+0x2da sys/ufs/ffs/ffs_inode.c:99
VOP_FSYNC(fffffd8065c2d020,fffffd807f7d7820,2,ffff80002a642d48) at VOP_FSYNC+0xc9 sys/kern/vfs_vops.c:311
ffs_sync_vnode(fffffd8065c2d020,ffff80002f52a898) at ffs_sync_vnode+0x16b sys/ufs/ffs/ffs_vfsops.c:1081
vfs_mount_foreach_vnode(ffff8000006c7800,ffffffff81c0dd80,ffff80002f52a898) at vfs_mount_foreach_vnode+0x55 sys/kern/vfs_subr.c:910
ffs_sync(ffff8000006c7800,2,0,fffffd807f7d7820,ffff80002a642d48) at ffs_sync+0x104 sys/ufs/ffs/ffs_vfsops.c:1131
sys_sync(ffff80002a642d48,0,0) at sys_sync+0xbc sys/kern/vfs_syscalls.c:536
vfs_syncwait(ffff80002a642d48,1) at vfs_syncwait+0x3b
vfs_shutdown(ffff80002a642d48) at vfs_shutdown+0x61 sys/kern/vfs_subr.c:1791
boot(100) at boot+0xe0 sys/arch/amd64/amd64/machdep.c:903
reboot(100) at reboot+0x7b
panic(ffffffff82825ce9) at panic+0x179 sys/kern/subr_prf.c:231
kerntrap(ffff80002f52ab80) at kerntrap+0x1c7 sys/arch/amd64/amd64/trap.c:327
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
__x86_indirect_thunk_r11() at __x86_indirect_thunk_r11+0x14
rt_match(ffff80002f52ae58,fffffd80694312ec,1,0) at rt_match+0xc3 rt_clone sys/net/route.c:351 [inline]
rt_match(ffff80002f52ae58,fffffd80694312ec,1,0) at rt_match+0xc3 sys/net/route.c:326
in_ouraddr(fffffd8069431200,ffff800000dd3000,ffff80002f52aee8) at in_ouraddr+0xab sys/netinet/ip_input.c:779
ip_input_if(ffff80002f52af98,ffff80002f52afa4,ffff80002dcf8000,0,ffff800000dd3000) at ip_input_if+0x29b sys/netinet/ip_input.c:448
ipv4_input(ffff800000dd3000,fffffd8069431200) at ipv4_input+0x47 sys/netinet/ip_input.c:290
ether_input(ffff800000dd3000,fffffd8069431200) at ether_input+0x525
tun_dev_write(5d07,ffff80002f52b318,ffff80002dcf8000,2) at tun_dev_write+0x209 sys/net/if_tun.c:914
spec_write(ffff80002f52b170) at spec_write+0xd8 sys/kern/spec_vnops.c:302
VOP_WRITE(fffffd80613d8b08,ffff80002f52b318,11,fffffd807f7d7820) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
vn_write(fffffd80674cf9f0,ffff80002f52b318,0) at vn_write+0x157 sys/kern/vfs_vnops.c:408
dofilewritev(ffff80002a642d48,c8,ffff80002f52b318,0,ffff80002f52b3c0) at dofilewritev+0x1ac sys/kern/sys_generic.c:375
sys_write(ffff80002a642d48,ffff80002f52b470,ffff80002f52b3c0) at sys_write+0x87 sys/kern/sys_generic.c:295
syscall(ffff80002f52b470) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xbcc8c14f5f0, count: 229
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 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> 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