nsswitch.conf and openldap-server

Hi,

I use Mandriva 2006 with ldap server (openldap-servers-2.3.6-4mdk)
I configure pam_ldap and nss_ldap on this server too  (pam_ldap-180-2mdk 
and nss_ldap-239-3.1.20060mdk)

It wors nice, then I enable the client by configuring the file nsswitch.conf

passwd:     files ldap
shadow:     files ldap
group:      files ldap

It works again !

and I reboot just afterwards, I have a problem during the sequence of 
starting
The PC remains very a long time blocked on "mount sysfs in /sys"
Then, I have 3 messages "/dev/mem, no such file or directory"
A lot of process don't work (I cannot connect by ssh by sample : stdin: 
is not a tty)
by removing words "ldap" from file nsswitch.conf and starts again all 
becomes again normal.

passwd:     files
shadow:     files
group:      files

I have to test that on 2 differents servers (with different hardware) 
and on a basic configuration of openldap too (just after an 
installation) and I have same the problems

Would somebody have an idea?

-- 
Frederic Bongat