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(ITS#7432) slapd crashes when removing members from a large group

Full_Name: Marvin Mundry
Version: 2.4.33
OS: Ubuntu 12.10
URL: https://idmswiki.rrz.uni-hamburg.de:8005/debug.tar.bz
Submission from: (NULL) (

i have slapcat'ed my production environment and slapadded it into an back_mdb

when deleting members one by one from a large group (48428 Members), after some
transactions slapd crashes.
when i slapadd my dit to an mdb without having an eq index configured for
"member" the removal of members works fine.

when doing the same thing (member indexed, slapadding members, starting slapd,
removing group members one by one) on a hdb, slapd does not crash.

sortvals is set for members as otherwise deletion operations would take a very
long time

i failed to reproduce the problem without initially slapadding the data from my
production environment into the mdb.

i have removed all configuration settings not neccessary to reproduce the bug

the debug.tar.bz should contain everything that is neccessary (including a
description) to reproduce the problem. additionally the file contains a coredump
and the full trace output

include		/usr/local/etc/openldap/schema/core.schema
include		/usr/local/etc/openldap/schema/cosine.schema
include		/usr/local/etc/openldap/schema/inetorgperson.schema
include		/usr/local/etc/openldap/schema/rfc2307bis.schema
pidfile		/usr/local/var/run/slapd.pid
argsfile	/usr/local/var/run/slapd.args
modulepath	/usr/local/libexec/openldap
moduleload	back_mdb.la
sortvals	member
database	mdb
suffix		"dc=test,dc=com"
rootdn		"cn=admin,dc=test,dc=com"
rootpw		secret
directory	/usr/local/etc/openldap/test123db/AL
index member eq
maxsize	1000000000

last lines of slapd -d Trace:
5096b5ae oc_check_allowed type "modifyTimestamp"
5096b5ae sl_malloc 8: ch_malloc #this line repeats 28450 times
5096b5ae => mdb_entry_encode(0x00010170): cn=gr97503,ou=groups,dc=test,dc=com
5096b5ae <= mdb_entry_encode(0x00010170): cn=gr97503,ou=groups,dc=test,dc=com

build options:
./configure --enable-dynamic=yes --enable-syslog=yes --enable-slapd=yes
--enable-dynacl=yes --enable-crypt=yes --enable-modules=yes --enable-rewrite=ye
s --enable-bdb=mod --enable-hdb=mod --enable-ldap=mod --enable-mdb=mod
--enable-meta=mod --enable-monitor=mod --enable-overlays=mod --with-tls=openssl


(gdb) bt:
#0  0x000002fc000002fa in ?? ()
#1  0x000002ff000002fd in ?? ()
#2  0x0000030200000300 in ?? ()
#3  0x0000030500000303 in ?? ()
#4  0x0000030800000306 in ?? ()
#5  0x0000030b00000309 in ?? ()
#6  0x00007f1400000312 in ?? ()
#7  0x0000009cffffffbf in ?? ()
#8  0x00007f1400000011 in ?? ()
#9  0x00000000000102a3 in ?? ()
#10 0x00007f140c101880 in ?? ()
#11 0x00007f140883c200 in ?? ()
#12 0x0000000000000891 in ?? ()
#13 0x00007f14155ef060 in ?? ()
#14 0x00007f14523dd5a6 in ?? ()
#15 0x00007f1451fa1010 in ?? ()
#16 0x00000000523dd2a7 in ?? ()
#17 0x00007f14155ef390 in ?? ()
#18 0x0000000000000000 in ?? ()