can't unmount openvz container

[convak]

I have a Proxmox with 15 VM - OpenVZ Container.

Yesterday i try to delete 1 container and have this error:

"Can't umount /var/lib/vz/root/110: Device or resource busy
TASK ERROR: command 'vzctl umount 110' failed: exit code 51"

"Can't umount /var/lib/vz/root/115: Device or resource busy
TASK ERROR: command 'vzctl umount 115' failed: exit code 51"

When i try to unmount any container happend the same...

What can i do???

 

[convak]

Finally i found the solution.

umount -l /var/lib/vz/root/115

After that can remove the container without problem.