syncing disks...panic: ffs_update: bad link cnt
Starting stack trace...
panic(ffffffff825f857d) at panic+0x155 sys/kern/subr_prf.c:233
ffs_update(fffffd806a94c870,0) at ffs_update+0x303 sys/ufs/ffs/ffs_inode.c:101
VOP_FSYNC(fffffd8067bbfc08,fffffd807f7d7720,2,ffff80002168cfd0) at VOP_FSYNC+0xc5 sys/kern/vfs_vops.c:327
ffs_sync_vnode(fffffd8067bbfc08,ffff80002e81d0b0) at ffs_sync_vnode+0x15a sys/ufs/ffs/ffs_vfsops.c:1191
vfs_mount_foreach_vnode(ffff8000006d8000,ffffffff81986970,ffff80002e81d0b0) at vfs_mount_foreach_vnode+0x55 sys/kern/vfs_subr.c:894
ffs_sync(ffff8000006d8000,2,0,fffffd807f7d7720,ffff80002168cfd0) at ffs_sync+0x11f sys/ufs/ffs/ffs_vfsops.c:1242
sys_sync(ffff80002168cfd0,0,0) at sys_sync+0xbc sys/kern/vfs_syscalls.c:539
vfs_syncwait(ffff80002168cfd0,1) at vfs_syncwait+0x36
vfs_shutdown(ffff80002168cfd0) at vfs_shutdown+0x5d sys/kern/vfs_subr.c:1770
boot(100) at boot+0xbb sys/arch/amd64/amd64/machdep.c:830
reboot(100) at reboot+0x77
panic(ffffffff82558501) at panic+0x175 sys/kern/subr_prf.c:235
vop_generic_badop(ffff80002e81d368) at vop_generic_badop+0x1b sys/kern/vfs_default.c:133
VOP_STRATEGY(fffffd806a7c94e0,fffffd805b1bed98) at VOP_STRATEGY+0x9b sys/kern/vfs_vops.c:644
bwrite(fffffd805b1bed98) at bwrite+0x1e7 sys/kern/vfs_bio.c:763
VOP_BWRITE(fffffd805b1bed98) at VOP_BWRITE+0x4a sys/kern/vfs_vops.c:656
ufs_mkdir(ffff80002e81d600) at ufs_mkdir+0x6b4 sys/ufs/ufs/ufs_vnops.c:1248
VOP_MKDIR(fffffd806a6f5548,ffff80002e81d760,ffff80002e81d790,ffff80002e81d690) at VOP_MKDIR+0xbf sys/kern/vfs_vops.c:404
domkdirat(ffff80002168cfd0,ffffff9c,20000100,0) at domkdirat+0x121 sys/kern/vfs_syscalls.c:3101
syscall(ffff80002e81d910) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xdfdeda6abc0, count: 236
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 7bbb59a4-3b4e-2ed3-58f8-154d5cc405f8
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 0x000f2730: 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 3.53
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