LDAP/NFS/PAM/AutoFS : mkhomedir PAM plugin failling

I have a working setup with OpenLDAP (authentication and NFS mount options), NFS server, AutoFS (to mount the NFS homedir) and required PAM plugins.

Everything works fine except the mkhomedir PAM plugin, which does not work properly since the home directory is not being automatically created at the first login.

Here is the error message:

Aug 26 11:21:55 SERVER1 sshd[3981]: pam_mkhomedir(sshd:session): unable to create directory /home/test2: No such file or directory

And nothing on the NFS/LDAP server.

My /etc/pam.d/common-session file:

session required    pam_unix.so
session required    pam_limits.so
session optional    pam_ldap.so
session required    pam_mkhomedir.so skel=/etc/skel umask=0022

My /etc/auto.master file:

/home   ldap://10.0.0.2/ou=export,dc=XXXX,dc=local --timeout=5

Both files are on the client side.

Any ideas?

Regards,