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This bug is created as a clone of upstream ticket:
https://fedorahosted.org/389/ticket/348

If multiple threads call ldap_initialize at the same time, the program will crash.  We have seen this in the server and in threaded tools such as ldclt on multiple platforms with openldap 2.4.24-2.4.30.  Threaded programs need to have a mutex around calls to ldap_initialize.

This can be reproduced by increasing the number of threads used by ldclt - you should eventually hit the crash - or by configuring the directory server with many (8) replication agreements, and repeatedly stopping and starting the server.  It will eventually crash at startup.

*** Bug 816037 has been marked as a duplicate of this bug. ***

I have tested this with stress testing, No core dumps found hence marking VERIFIED.

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Cause: Using replication with many replication agreements.
Consequence: Server crashes at startup.
Fix: ldap_initialize() is not thread-safe.  Use a mutex to make sure only one thread at a time calls it.
Result: Server does not crash at startup when using replication with many replication agreements.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2012-0813.html