Error removing chrooted home folder

I deleted one of my virtual servers which had admin user with chrooted home folder.

Deleting task give error: Deleting administration user …
… Administration user failed! : Failed to open /home/chroot/151570372820104/etc/passwd for writing : No such file or directory at /usr/libexec/webmin/ line 1445.

Now I am left with home-chroot-151570372820104-home-username.mount service which start in every boot even not set to do it.

When running sudo rm -rf /home/chroot/151570372820104 gives rm: cannot remove ‘/home/chroot/151570372820104/home/username’: Device or resource busy

lsof +D /home/chroot/151570372820104/home/username/ don’t give anything.

OS is CentOS 2.6.32-042stab125.3 with newest Virtualmin and Webmin

What can I try next?

Any help?