This bug has been copied from bug #591419 and has been proposed to be backported to 5.5 z-stream (EUS).
fixed in openldap-2.3.43-12.el5_5.3
Technical note added. If any revisions are required, please edit the "Technical Notes" field accordingly. All revisions will be proofread by the Engineering Content Services team. New Contents: Due to an error introduced in one of the previous updates, initializing a connection to a slapd server may have caused the CPU usage to reach 100% and the server to become unresponsive for about 3 seconds. With this update, an existing upstream patch has been applied to target this issue, and the OpenLDAP suite now works as expected.
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2010-0914.html