panic: trap type 4, code=0, pc=ffffffff81044650
Starting stack trace...
panic(ffffffff82391fd8) at panic+0x14c sys/kern/subr_prf.c:218
kerntrap(ffff80001d95b4d0) at kerntrap+0x1b7 sys/arch/amd64/amd64/trap.c:316
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
pfi_ifhead_RB_REMOVE(ffffffff827e8bb0,ffff800000b88200) at pfi_ifhead_RB_REMOVE+0x50 sys/net/pf_if.c:80
pfi_detach_ifgroup(ffff800000ae8b80) at pfi_detach_ifgroup+0x11b pfi_kif_unref sys/net/pf_if.c:211 [inline]
pfi_detach_ifgroup(ffff800000ae8b80) at pfi_detach_ifgroup+0x11b sys/net/pf_if.c:304
if_delgroup(ffff800000b69800,ffff800000ae8b80) at if_delgroup+0x193 sys/net/if.c:2679
if_detach(ffff800000b69800) at if_detach+0x1ab sys/net/if.c:1042
tun_clone_destroy(ffff800000b69800) at tun_clone_destroy+0x1c7 sys/net/if_tun.c:325
if_clone_destroy(ffff80001d95b780) at if_clone_destroy+0x136 sys/net/if.c:1201
tun_dev_close(5d00,7) at tun_dev_close+0x140 sys/net/if_tun.c:476
spec_close(ffff80001d95b850) at spec_close+0x311 sys/kern/spec_vnops.c:560
VOP_CLOSE(fffffd806478d8f0,7,fffffd806c3b78a0,ffff80001d8af4a0) at VOP_CLOSE+0xe2 sys/kern/vfs_vops.c:177
vn_closefile(fffffd805d7f0cb0,ffff80001d8af4a0) at vn_closefile+0xd2 vn_close sys/kern/vfs_vnops.c:298 [inline]
vn_closefile(fffffd805d7f0cb0,ffff80001d8af4a0) at vn_closefile+0xd2 sys/kern/vfs_vnops.c:614
fdrop(fffffd805d7f0cb0,ffff80001d8af4a0) at fdrop+0xc2 sys/kern/kern_descrip.c:1279
closef(fffffd805d7f0cb0,ffff80001d8af4a0) at closef+0x117 sys/kern/kern_descrip.c:1263
fdfree(ffff80001d8af4a0) at fdfree+0xf3 sys/kern/kern_descrip.c:1195
exit1(ffff80001d8af4a0,0,9,1) at exit1+0x330 sys/kern/kern_exit.c:197
postsig(ffff80001d8af4a0,9) at postsig+0x560 sigexit sys/kern/kern_sig.c:1494 [inline]
postsig(ffff80001d8af4a0,9) at postsig+0x560 sys/kern/kern_sig.c:1423
userret(ffff80001d8af4a0) at userret+0x149 sys/kern/kern_sig.c:1914
syscall(ffff80001d95bcd0) at syscall+0x429 mi_syscall_return sys/sys/syscall_mi.h:129 [inline]
syscall(ffff80001d95bcd0) at syscall+0x429 sys/arch/amd64/amd64/trap.c:612
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7fffffb000, count: 236
End of stack trace.
syncing disks...panic: ffs_update: bad link cnt
Starting stack trace...
panic(ffffffff8241bb9b) at panic+0x14c sys/kern/subr_prf.c:218
ffs_update(fffffd8052ef7970,0) at ffs_update+0x323 sys/ufs/ffs/ffs_inode.c:101
VOP_FSYNC(fffffd806916e5b0,fffffd806c3b78a0,2,ffff80001d8af4a0) at VOP_FSYNC+0xcc sys/kern/vfs_vops.c:362
ffs_sync_vnode(fffffd806916e5b0,ffff80001d95b1e0) at ffs_sync_vnode+0x18a sys/ufs/ffs/ffs_vfsops.c:1194
vfs_mount_foreach_vnode(ffff8000006b0c00,ffffffff8104e260,ffff80001d95b1e0) at vfs_mount_foreach_vnode+0x55 sys/kern/vfs_subr.c:885
ffs_sync(ffff8000006b0c00,2,0,fffffd806c3b78a0,ffff80001d8af4a0) at ffs_sync+0x100 sys/ufs/ffs/ffs_vfsops.c:1245
sys_sync(ffff80001d8af4a0,0,0) at sys_sync+0xbc sys/kern/vfs_syscalls.c:540
vfs_syncwait(ffff80001d8af4a0,1) at vfs_syncwait+0x36
vfs_shutdown(ffff80001d8af4a0) at vfs_shutdown+0x5d sys/kern/vfs_subr.c:1750
boot(100) at boot+0xbe sys/arch/amd64/amd64/machdep.c:837
reboot(100) at reboot+0x77
panic(ffffffff82391fd8) at panic+0x154 sys/kern/subr_prf.c:214
kerntrap(ffff80001d95b4d0) at kerntrap+0x1b7 sys/arch/amd64/amd64/trap.c:316
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
pfi_ifhead_RB_REMOVE(ffffffff827e8bb0,ffff800000b88200) at pfi_ifhead_RB_REMOVE+0x50 sys/net/pf_if.c:80
pfi_detach_ifgroup(ffff800000ae8b80) at pfi_detach_ifgroup+0x11b pfi_kif_unref sys/net/pf_if.c:211 [inline]
pfi_detach_ifgroup(ffff800000ae8b80) at pfi_detach_ifgroup+0x11b sys/net/pf_if.c:304
if_delgroup(ffff800000b69800,ffff800000ae8b80) at if_delgroup+0x193 sys/net/if.c:2679
if_detach(ffff800000b69800) at if_detach+0x1ab sys/net/if.c:1042
tun_clone_destroy(ffff800000b69800) at tun_clone_destroy+0x1c7 sys/net/if_tun.c:325
if_clone_destroy(ffff80001d95b780) at if_clone_destroy+0x136 sys/net/if.c:1201
tun_dev_close(5d00,7) at tun_dev_close+0x140 sys/net/if_tun.c:476
spec_close(ffff80001d95b850) at spec_close+0x311 sys/kern/spec_vnops.c:560
VOP_CLOSE(fffffd806478d8f0,7,fffffd806c3b78a0,ffff80001d8af4a0) at VOP_CLOSE+0xe2 sys/kern/vfs_vops.c:177
vn_closefile(fffffd805d7f0cb0,ffff80001d8af4a0) at vn_closefile+0xd2 vn_close sys/kern/vfs_vnops.c:298 [inline]
vn_closefile(fffffd805d7f0cb0,ffff80001d8af4a0) at vn_closefile+0xd2 sys/kern/vfs_vnops.c:614
fdrop(fffffd805d7f0cb0,ffff80001d8af4a0) at fdrop+0xc2 sys/kern/kern_descrip.c:1279
closef(fffffd805d7f0cb0,ffff80001d8af4a0) at closef+0x117 sys/kern/kern_descrip.c:1263
fdfree(ffff80001d8af4a0) at fdfree+0xf3 sys/kern/kern_descrip.c:1195
exit1(ffff80001d8af4a0,0,9,1) at exit1+0x330 sys/kern/kern_exit.c:197
postsig(ffff80001d8af4a0,9) at postsig+0x560 sigexit sys/kern/kern_sig.c:1494 [inline]
postsig(ffff80001d8af4a0,9) at postsig+0x560 sys/kern/kern_sig.c:1423
userret(ffff80001d8af4a0) at userret+0x149 sys/kern/kern_sig.c:1914
syscall(ffff80001d95bcd0) at syscall+0x429 mi_syscall_return sys/sys/syscall_mi.h:129 [inline]
syscall(ffff80001d95bcd0) at syscall+0x429 sys/arch/amd64/amd64/trap.c:612
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7fffffb000, count: 225
End of stack trace.

dump to dev 4,1 not possible
rebooting...
SeaBIOS (version 1.8.2-google)
Total RAM Size = 0x000000006cc00000 = 1740 MiB
CPUs found: 1     Max CPUs supported: 1
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 0x000f2350: 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> 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