syncing disks...panic: ffs_update: bad link cnt
Starting stack trace...
panic(ffffffff825dfa8a) at panic+0x155 sys/kern/subr_prf.c:233
ffs_update(fffffd807d0b1e10,0) at ffs_update+0x303 sys/ufs/ffs/ffs_inode.c:101
VOP_FSYNC(fffffd806e3b7748,fffffd807f7d89c0,2,ffff80002161a000) at VOP_FSYNC+0xc5 sys/kern/vfs_vops.c:327
ffs_sync_vnode(fffffd806e3b7748,ffff80002b398a60) at ffs_sync_vnode+0x15a sys/ufs/ffs/ffs_vfsops.c:1191
vfs_mount_foreach_vnode(ffff8000006dd000,ffffffff8239afd0,ffff80002b398a60) at vfs_mount_foreach_vnode+0x55 sys/kern/vfs_subr.c:893
ffs_sync(ffff8000006dd000,2,0,fffffd807f7d89c0,ffff80002161a000) at ffs_sync+0x11f sys/ufs/ffs/ffs_vfsops.c:1242
sys_sync(ffff80002161a000,0,0) at sys_sync+0xbc sys/kern/vfs_syscalls.c:539
vfs_syncwait(ffff80002161a000,1) at vfs_syncwait+0x36
vfs_shutdown(ffff80002161a000) at vfs_shutdown+0x5d sys/kern/vfs_subr.c:1769
boot(100) at boot+0xbb sys/arch/amd64/amd64/machdep.c:830
reboot(100) at reboot+0x77
panic(ffffffff8253ff98) at panic+0x175 sys/kern/subr_prf.c:235
vop_generic_badop(ffff80002b398d18) at vop_generic_badop+0x1b sys/kern/vfs_default.c:133
VOP_STRATEGY(fffffd805f73e2c8,fffffd8077360018) at VOP_STRATEGY+0x9b sys/kern/vfs_vops.c:644
bwrite(fffffd8077360018) at bwrite+0x1e7 sys/kern/vfs_bio.c:763
VOP_BWRITE(fffffd8077360018) at VOP_BWRITE+0x4a sys/kern/vfs_vops.c:656
ufs_mkdir(ffff80002b398fb0) at ufs_mkdir+0x6b4 sys/ufs/ufs/ufs_vnops.c:1248
VOP_MKDIR(fffffd80693c5888,ffff80002b399110,ffff80002b399140,ffff80002b399040) at VOP_MKDIR+0xbf sys/kern/vfs_vops.c:404
domkdirat(ffff80002161a000,ffffff9c,7f7ffffd6970,1ff) at domkdirat+0x121 sys/kern/vfs_syscalls.c:3101
syscall(ffff80002b3992c0) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffd69e0, 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 969d4b26-6dee-2bb7-7d35-48434919f208
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 0x000f2780: 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