syncing disks...panic: ffs_update: bad link cnt
Starting stack trace...
panic(ffffffff827f330a) at panic+0x16b sys/kern/subr_prf.c:229
ffs_update(fffffd806b83a560,0) at ffs_update+0x303 sys/ufs/ffs/ffs_inode.c:101
VOP_FSYNC(fffffd806b8c21c0,fffffd807f7d76e8,2,ffff8000212a0e08) at VOP_FSYNC+0xce sys/kern/vfs_vops.c:311
ffs_sync_vnode(fffffd806b8c21c0,ffff800025f3e8f0) at ffs_sync_vnode+0x180 sys/ufs/ffs/ffs_vfsops.c:1197
vfs_mount_foreach_vnode(ffff8000006d9c00,ffffffff82065c60,ffff800025f3e8f0) at vfs_mount_foreach_vnode+0x55 sys/kern/vfs_subr.c:910
ffs_sync(ffff8000006d9c00,2,0,fffffd807f7d76e8,ffff8000212a0e08) at ffs_sync+0x11f sys/ufs/ffs/ffs_vfsops.c:1248
sys_sync(ffff8000212a0e08,0,0) at sys_sync+0xbc sys/kern/vfs_syscalls.c:537
vfs_syncwait(ffff8000212a0e08,1) at vfs_syncwait+0x36
vfs_shutdown(ffff8000212a0e08) at vfs_shutdown+0x5d sys/kern/vfs_subr.c:1791
boot(100) at boot+0xc8 sys/arch/amd64/amd64/machdep.c:843
uoakrh_match(100,100,0) at uoakrh_match
panic(ffffffff82742aec) at panic+0x18b sys/kern/subr_prf.c:231
vop_generic_badop(ffff800025f3ebb8) at vop_generic_badop+0x1b sys/kern/vfs_default.c:133
VOP_STRATEGY(fffffd8061a402e0,fffffd8072883908) at VOP_STRATEGY+0x9b sys/kern/vfs_vops.c:628
bwrite(fffffd8072883908) at bwrite+0x1f0 sys/kern/vfs_bio.c:760
VOP_BWRITE(fffffd8072883908) at VOP_BWRITE+0x4a sys/kern/vfs_vops.c:640
ufs_mkdir(ffff800025f3ee50) at ufs_mkdir+0x6b4 sys/ufs/ufs/ufs_vnops.c:1236
VOP_MKDIR(fffffd805dec7130,ffff800025f3efb0,ffff800025f3efe0,ffff800025f3eee0) at VOP_MKDIR+0xbf sys/kern/vfs_vops.c:388
domkdirat(ffff8000212a0e08,ffffff9c,7f7fffffb7d0,1ff) at domkdirat+0x121 sys/kern/vfs_syscalls.c:3112
syscall(ffff800025f3f160) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline]
syscall(ffff800025f3f160) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:625
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7fffffb840, count: 236
End of stack trace.

dump to dev 4,1 not possible
repabnooitc:i knger..n.el
 diagnostic asSeaBIOS (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 10ee261f-e4fb-b939-235d-2a56a4c27911
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 0x000f2810: 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 3.55
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