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(ITS#4390) slapd-ldap crashes with failed assertion

Full_Name: Aleksander Adamowski
Version: 2.3.19
OS: Fedora Core 4 on x86_64
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (

In our company, we use OpenLDAP for our main mail server in a setup described in
ITS #4387 (http://www.openldap.org/its/index.cgi?findid=4387).
It might be relevant that it runs on x86-64 architecture.

With this setup, the slapd-ldap backend crashes very frequently with the
following assertion:

slapd: ../../../../servers/slapd/back-ldap/unbind.c:60: ldap_back_conn_destroy:
Assertion `lc->lc_refcnt == 0' failed.

Unfortunately, I'm unable to determine the exact cause of this, the logs don't
show any suspicious queries before the crash occurs.

The problem doesn't hit us hard because we've been running the slapd-ldap
instance in an infinite loop for some time, to let it come up immediately after
crashes (which are unfortunately very frequent).