can't unmout cleanly because of nss-ldap

[Tim Dijkstra <tim@famdijkstra.org>]

Hi,

I got a strange problem on a set of machines that use ldap queries as
authentication. In the file nsswitch.cof they have:
passwd:         files ldap
group:          files ldap
shadow:         files ldap

All works fine, but if I want to unmount /usr (something that happens at
reboot or halt) that fails because the device is 'busy'. I suspect
this has something to do with ldap related libraries that are still in
memory and live in /usr/lib. Now the question is: How do I fix this,
I'm really fed-up with the fsck every reboot...

Thnx Tim