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(ITS#6907) openldap 2.4.25 segfaults when using apache directory studio to rename objects

Full_Name: Seth
Version: 2.4.25
OS: Linux (Ubuntu)
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (

Using Apache Directory Studio to interface with hdb-based openldap server via
TLS. Moving a DN from one ou to another crashes slapd. The move (the first one
if there are multiples) appears to work before slapd segfaults. An example in
the logfile:

Apr 12 17:17:52 ldap slapd[11278]: conn=1000 op=13 MODRDN
Apr 12 17:17:52 ldap kernel: [974579.184525] slapd[11281]: segfault at
7f0bdfab7ff8 ip 000000000049af05 sp 00007f0bdfab8000 error 6 in

This is 100% reproducible. Also affects 2.4.23-0ubuntu3.5 (ubuntu package) - I
upgraded from source to try to work around this bug.