syncing disks...panic: ffs_update: bad link cnt
Starting stack trace...
panic(ffffffff828224ac) at panic+0x159 sys/kern/subr_prf.c:229
ffs_update(fffffd806e399008,0) at ffs_update+0x313 sys/ufs/ffs/ffs_inode.c:101
VOP_FSYNC(fffffd807aaef370,fffffd807f7d7750,2,ffff80002a703ab0) at VOP_FSYNC+0xc9 sys/kern/vfs_vops.c:311
ffs_sync_vnode(fffffd807aaef370,ffff800033de2b00) at ffs_sync_vnode+0x184 sys/ufs/ffs/ffs_vfsops.c:1187
vfs_mount_foreach_vnode(ffff8000006d9000,ffffffff81e0a870,ffff800033de2b00) at vfs_mount_foreach_vnode+0x55 sys/kern/vfs_subr.c:910
ffs_sync(ffff8000006d9000,2,0,fffffd807f7d7750,ffff80002a703ab0) at ffs_sync+0x11f sys/ufs/ffs/ffs_vfsops.c:1238
sys_sync(ffff80002a703ab0,0,0) at sys_sync+0xbc sys/kern/vfs_syscalls.c:536
vfs_syncwait(ffff80002a703ab0,1) at vfs_syncwait+0x3a
vfs_shutdown(ffff80002a703ab0) at vfs_shutdown+0x61 sys/kern/vfs_subr.c:1791
boot(100) at boot+0xbf sys/arch/amd64/amd64/machdep.c:901
reboot(100) at reboot+0x7b
panic(ffffffff82778815) at panic+0x179 sys/kern/subr_prf.c:231
vop_generic_badop(ffff800033de2db0) at vop_generic_badop+0x1f sys/kern/vfs_default.c:133
VOP_READLINK(fffffd807aaef0e8,ffff800033de2ee0,fffffd807f7d7750) at VOP_READLINK+0xba sys/kern/vfs_vops.c:460
doreadlinkat(ffff80002a703ab0,ffffff9c,20000000,200000c0,84,ffff800033de2ff0) at doreadlinkat+0x11c sys/kern/vfs_syscalls.c:2179
syscall(ffff800033de3060) at syscall+0x543 sys/arch/amd64/amd64/trap.c:606
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x4fc83e15f20, count: 240
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 1f64d870-06f2-d8bf-7327-adc6877a2997
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 0x000f28a0: 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 $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