panic: trap type 4, code=0, pc=ffffffff81f25290
Starting stack trace...
panic(ffffffff823bbf15) at panic+0x14c sys/kern/subr_prf.c:218
kerntrap(ffff80002230a290) at kerntrap+0x1d7 sys/arch/amd64/amd64/trap.c:296
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
pfi_ifhead_RB_REMOVE(ffffffff828f0618,ffff800000b2e200) at pfi_ifhead_RB_REMOVE+0x50 sys/net/pf_if.c:80
pfi_detach_ifgroup(ffff800000b08180) at pfi_detach_ifgroup+0x11b pfi_kif_unref sys/net/pf_if.c:211 [inline]
pfi_detach_ifgroup(ffff800000b08180) at pfi_detach_ifgroup+0x11b sys/net/pf_if.c:304
if_delgroup(ffff800000b9d000,ffff800000b08180) at if_delgroup+0x193 sys/net/if.c:2679
if_detach(ffff800000b9d000) at if_detach+0x1ab sys/net/if.c:1042
tun_clone_destroy(ffff800000b9d000) at tun_clone_destroy+0x1e1 sys/net/if_tun.c:325
if_clone_destroy(ffff80002230a540) 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(ffff80002230a610) at spec_close+0x311 sys/kern/spec_vnops.c:560
VOP_CLOSE(fffffd806edaf688,7,fffffd807f7bf480,ffff8000212a6ee8) at VOP_CLOSE+0xc0 sys/kern/vfs_vops.c:174
vn_closefile(fffffd806caf1860,ffff8000212a6ee8) at vn_closefile+0xd7 vn_close sys/kern/vfs_vnops.c:298 [inline]
vn_closefile(fffffd806caf1860,ffff8000212a6ee8) at vn_closefile+0xd7 sys/kern/vfs_vnops.c:614
fdrop(fffffd806caf1860,ffff8000212a6ee8) at fdrop+0xc2 sys/kern/kern_descrip.c:1279
closef(fffffd806caf1860,ffff8000212a6ee8) at closef+0x11c sys/kern/kern_descrip.c:1263
fdfree(ffff8000212a6ee8) at fdfree+0xf4 sys/kern/kern_descrip.c:1195
exit1(ffff8000212a6ee8,0,19,1) at exit1+0x320 sys/kern/kern_exit.c:197
postsig(ffff8000212a6ee8,19) at postsig+0x4ea sigexit sys/kern/kern_sig.c:1486 [inline]
postsig(ffff8000212a6ee8,19) at postsig+0x4ea sys/kern/kern_sig.c:1418
userret(ffff8000212a6ee8) at userret+0x189 sys/kern/kern_sig.c:1906
Xsyscall() at Xsyscall+0x156
end of kernel
end trace frame: 0x7f7ffffd3920, count: 237
End of stack trace.
syncing disks...14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14  giving up

dump to dev 4,1 not possible
rpeanbiooct: inkge.r.n.el
 diagnostiSeaBIOS (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 all locks
boot: illegal argument all
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