It was reported  that with the deref overlay enabled, ldapsearch with '-E deref=member:' causes slapd to crash.
Upstream bugreport: http://www.openldap.org/its/?findid=8027
Upstream commit: http://www.openldap.org/devel/gitweb.cgi?p=openldap.git;a=commitdiff;h=7a5a98577a0481d864ca7fe05b9b32274d4d1fb5
Created openldap tracking bugs for this issue:
Affects: fedora-all [bug 1190645]
This issue did not affect the versions of openldap as shipped with Red Hat Enterprise Linux 5, 6, and 7 as they did not include support for the deref overlay.