Hi ,
Are you using the any backup solution to take back of these virtual machine, if yes reboot it.
When we get this "mode 0, owner 00000000-00000000-0000-000000000000 mtime 344788 nHld 0 nOvf 0]" does not mean that there is no owner, we have to get this using the hexdump.
hexdump -C /vmfs/volumes/datastore/.vh.sf -n 512 -s 3654144
datastore= your datastore name in which VM is residing.
Get me the output.
Regards
Mohammed Emaad