syncing disks...panic: ffs_update: bad link cnt
Starting stack trace...
panic(ffffffff8263bc47) at panic+0x16b sys/kern/subr_prf.c:229
ffs_update(fffffd806a9b8660,0) at ffs_update+0x303 sys/ufs/ffs/ffs_inode.c:101
VOP_FSYNC(fffffd807a808db8,fffffd807f7d7618,2,ffff80002132da40) at VOP_FSYNC+0xce sys/kern/vfs_vops.c:311
ffs_sync_vnode(fffffd807a808db8,ffff8000257c4500) at ffs_sync_vnode+0x180 sys/ufs/ffs/ffs_vfsops.c:1197
vfs_mount_foreach_vnode(ffff8000006d7c00,ffffffff823a4d20,ffff8000257c4500) at vfs_mount_foreach_vnode+0x55 sys/kern/vfs_subr.c:910
ffs_sync(ffff8000006d7c00,2,0,fffffd807f7
d7618,ffff80002132da40) at ffs_sync+0x11f sys/ufs/ffs/ffs_vfsops.c:1248
sys_sync(ffff80002132da40,0,0) at sys_sync+0xbc sys/kern/vfs_syscalls.c:537
vfs_syncwait(ffff80002132da40,1) at vfs_syncwait+0x36
vfs_shutdown(ffff80002132da40) at vfs_shutdown+0x5d sys/kern/vfs_subr.c:1791
boot(100) at boot+0xc8 sys/arch/amd64/amd64/machdep.c:830
umcs_get_status(100,100,0,0) at umcs_get_status
panic(ffffffff8259752b) at panic+0x18b sys/kern/subr_prf.c:231
vop_generic_badop(ffff8000257c47c8) at vop_generic_badop+0x1b sys/kern/vfs_default.c:133
VOP_STRATEGY(fffffd80690ef3a8,fffffd807a12a4c0) at VOP_STRATEGY+0x9b sys/kern/vfs_vops.c:628
bwrite(fffffd807a12a4c0) at bwrite+0x1f0 sys/kern/vfs_bio.c:760
VOP_BWRITE(fffffd807a12a4c0) at VOP_BWRITE+0x4a sys/kern/vfs_vops.c:640
ufs_mkdir(ffff8000257c4a60) at ufs_mkdir+0x6b4 sys/ufs/ufs/ufs_vnops.c:1236
VOP_MKDIR(fffffd807a64bb50,ffff8000257c4bc0,ffff8000257c4bf0,ffff8000257c4af0) at VOP_MKDIR+0xbf sys/kern/vfs_vops.c:388
domkdirat(ffff80002132da40,ffffff9c,7f7ffffec910,1ff) at domkdirat+0x121 sys/kern/vfs_syscalls.c:3112
syscall(ffff8000257c4d70) at syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline]
syscall(ffff8000257c4d70) at syscall+0x435 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffec980, count: 236
End of stack trace.

dump to dev 4,1 not possible
rpeabnoiocti:n kg.e.rn.e
l diagnostic aSeaBIOS (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 bbcbd082-acfd-33d1-ec83-4c20355829bb
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 0x000f24c0: 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 3.54
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