syncing disks...panic: ffs_update: bad link cnt
Starting stack trace...
panic(ffffffff828bbfca) at panic+0x159 sys/kern/subr_prf.c:229
ffs_update(fffffd80787ab4c0,0) at ffs_update+0x2da sys/ufs/ffs/ffs_inode.c:99
VOP_FSYNC(fffffd8066112628,fffffd807f7d7a90,2,ffff80002a6b1208) at VOP_FSYNC+0xc9 sys/kern/vfs_vops.c:311
ffs_sync_vnode(fffffd8066112628,ffff8000377bb1f8) at ffs_sync_vnode+0x16b sys/ufs/ffs/ffs_vfsops.c:1081
vfs_mount_foreach_vnode(ffff8000006cf000,ffffffff8191e500,ffff8000377bb1f8) at vfs_mount_foreach_vnode+0x55 sys/kern/vfs_subr.c:910
ffs_sync(ffff8000006cf000,2,0,fffffd807f7d7a90,ffff80002a6b1208) at ffs_sync+0x104 sys/ufs/ffs/ffs_vfsops.c:1131
sys_sync(ffff80002a6b1208,0,0) at sys_sync+0xbc sys/kern/vfs_syscalls.c:537
vfs_syncwait(ffff80002a6b1208,1) at vfs_syncwait+0x3b
vfs_shutdown(ffff80002a6b1208) at vfs_shutdown+0x61 sys/kern/vfs_subr.c:1791
boot(100) at boot+0xe0 sys/arch/amd64/amd64/machdep.c:900
reboot(100) at reboot+0x7b
panic(ffffffff8286dfc2) at panic+0x179 sys/kern/subr_prf.c:231
vop_generic_badop(ffff8000377bb4b8) at vop_generic_badop+0x1f sys/kern/vfs_default.c:133
VOP_STRATEGY(fffffd805bd12478,fffffd807147e9e0) at VOP_STRATEGY+0x9f sys/kern/vfs_vops.c:634
bwrite(fffffd807147e9e0) at bwrite+0x1ca sys/kern/vfs_bio.c:757
VOP_BWRITE(fffffd807147e9e0) at VOP_BWRITE+0x4e sys/kern/vfs_vops.c:646
ffs_truncate(fffffd807a9dbe10,3,0,fffffd807f7d7a90) at ffs_truncate+0x46e sys/ufs/ffs/ffs_inode.c:195
ufs_setattr(ffff8000377bb830) at ufs_setattr+0x683 sys/ufs/ufs/ufs_vnops.c:403
VOP_SETATTR(fffffd805bd12478,ffff8000377bb8b8,fffffd807f7d7a90,ffff80002a6b1208) at VOP_SETATTR+0xd4 sys/kern/vfs_vops.c:210
dotruncate(ffff80002a6b1208,fffffd805bd12478,3) at dotruncate+0x13e sys/kern/vfs_syscalls.c:2855
sys_truncate(ffff80002a6b1208,ffff8000377bbb90,ffff8000377bbae0) at sys_truncate+0xe1 sys/kern/vfs_syscalls.c:2880
syscall(ffff8000377bbb90) at syscall+0x72a sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x5fc44f540f0, count: 234
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 6a63e308-43db-2955-5bd8-f45d251cdfc1
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 $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