Su: Cannot set user id: Resource temporarily unavailable

Error details:

   # su – Password: su: cannot set user id: Resource temporarily unavailable

Solution:

Edit (add) or change the following values in /etc/security/limits.conf

# vi /etc/security/limits.conf
-------------
*          soft     nproc          2047
*          hard     nproc          16384
*          soft     nofile         1024
*          hard     nofile         65536
-------------

It should be okay now!