panic: trap type 4, code=0, pc=ffffffff81dd4a10
Starting stack trace...
panic(ffffffff823be75e) at panic+0x14c sys/kern/subr_prf.c:218
kerntrap(ffff80002350a510) at kerntrap+0x1d7 sys/arch/amd64/amd64/trap.c:295
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
pfi_ifhead_RB_REMOVE(ffffffff828eed90,ffff800000b72600) at pfi_ifhead_RB_REMOVE+0x50 sys/net/pf_if.c:80
pfi_detach_ifgroup(ffff800000b08680) at pfi_detach_ifgroup+0x11b pfi_kif_unref sys/net/pf_if.c:211 [inline]
pfi_detach_ifgroup(ffff800000b08680) at pfi_detach_ifgroup+0x11b sys/net/pf_if.c:304
if_delgroup(ffff800000b09800,ffff800000b08680) at if_delgroup+0x193 sys/net/if.c:2679
if_detach(ffff800000b09800) at if_detach+0x1ab sys/net/if.c:1042
tun_clone_destroy(ffff800000b09800) at tun_clone_destroy+0x1e1 sys/net/if_tun.c:325
if_clone_destroy(ffff80002350a7c0) at if_clone_destroy+0x146 sys/net/if.c:1201
tun_dev_close(5d01,7) at tun_dev_close+0x140 sys/net/if_tun.c:476
spec_close(ffff80002350a890) at spec_close+0x311 sys/kern/spec_vnops.c:560
VOP_CLOSE(fffffd806ecaf348,7,fffffd807f7bf900,ffff8000212c5650) at VOP_CLOSE+0xeb sys/kern/vfs_vops.c:177
vn_closefile(fffffd806cae9730,ffff8000212c5650) at vn_closefile+0xd7 vn_close sys/kern/vfs_vnops.c:298 [inline]
vn_closefile(fffffd806cae9730,ffff8000212c5650) at vn_closefile+0xd7 sys/kern/vfs_vnops.c:614
fdrop(fffffd806cae9730,ffff8000212c5650) at fdrop+0xc2 sys/kern/kern_descrip.c:1279
closef(fffffd806cae9730,ffff8000212c5650) at closef+0x11c sys/kern/kern_descrip.c:1263
fdfree(ffff8000212c5650) at fdfree+0xf4 sys/kern/kern_descrip.c:1195
exit1(ffff8000212c5650,0,19,1) at exit1+0x320 sys/kern/kern_exit.c:197
postsig(ffff8000212c5650,19) at postsig+0x4ea sigexit sys/kern/kern_sig.c:1486 [inline]
postsig(ffff8000212c5650,19) at postsig+0x4ea sys/kern/kern_sig.c:1418
userret(ffff8000212c5650) at userret+0x189 sys/kern/kern_sig.c:1906
Xsyscall() at Xsyscall+0x156
end of kernel
end trace frame: 0x7f7fffff9ff0, count: 237
End of stack trace.
syncing disks...16 14 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6  giving up

dump to dev 4,1 not possible
rpeabnoiotc:i nkeg.r.ne.l
 diagnostic SeaBIOS (version 1.8.2-20200706_154733-google)
Total RAM Size = 0x0000000080000000 = 2048 MiB
CPUs found: 2     Max CPUs supported: 2
found virtio-scsi at 0:3
virtio-scsi vendor='Google' product='PersistentDisk' rev='1' type=0 removable=0
virtio-scsi blksize=512 sectors=2097152 = 1024 MiB
drive 0x000f2260: PCHS=0/0/0 translation=lba LCHS=1024/32/63 s=2097152
Sending Seabios boot VM event.
Booting from Hard Disk 0...
>> OpenBSD/amd64 BOOT 3.52
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