slapd segfaults with mdb

[Meike Stone <meike.stone@googlemail.com>]

Hello,


I play a little with the mdb on a test machine, and imported our db
from production system.
(about 1,500,000 entires, 2,5GByte ldif from slapcat)

I took the slapd source from git today, and because of segmentation
fault, I compiled slapd with debugging symbols.

My configuration is simple:
--------------------------------------------
include       /etc/openldap/schema/core.schema
include       /etc/openldap/schema/cosine.schema
include       /etc/openldap/schema/inetorgperson.schema
include       /etc/openldap/schema/yast.schema
include       /etc/openldap/schema/rfc2307bis.schema
include       /etc/openldap/schema/my_ldap_attributes.schema
include       /etc/openldap/schema/my_ldap_ObjectClasses.schema


pidfile         /var/run/slapd/slapd.pid
argsfile       /var/run/slapd/slapd.args


sizelimit     -1
timelimit     300
disallow      bind_anon
require        authc

gentlehup    on
tool-threads 4

serverID      001

############################
# mdb database definitions
############################

database    mdb
suffix          "ou=root"
rootdn         "cn=admin,ou=root"
rootpw        password
directory     /var/lib/ldap/ldap.mdb
loglevel      256
maxsize    10737418240

envflags     writemap,nometasync

index   objectClass,entryUUID,entryCSN          eq
index   cn                                      eq,sub
.
.
. some other own indexes here

--------------------------------------------

I started my search via:

/tmp/ol/usr/local/bin/ldapsearch -x -h localhost -w password -D
cn=admin,ou=root -b'ou=root' '(objectClass=*)' >/dev/null


and got in the syslog folloing meassge:

Jan 21 17:50:31 debld02 kernel: [348860.053152] slapd[19394]: segfault
at 7f760f974ce8 ip 000000000053bea1 sp 00007f738b10a650 error 4 in
slapd
[400000+227000]



Because of this, I configured the kernel to core dump:

sysctl -w kernel.core_pattern=/tmp/core
sysctl -w kernel.core_uses_pid=1
sysctl -w kernel.suid_dumpable=2
ulimit -c unlimited
ulimit -v unlimited


and got the result via:

~# gdb /tmp/ol/usr/local/libexec/slapd /tmp/core.19386

Core was generated by
`/tmp/buildforopenldaptechnical/usr/local/libexec/slapd -h ldap:///
-f /etc/op'.
Program terminated with signal 11, Segmentation fault.
#0  0x000000000053bea1 in mdb_entry_decode (op=0xc3a020,
data=0x7f738b10a770, e=0x7f738b11a828) at id2entry.c:666
666                     a->a_desc = mdb->mi_ads[*lp++];
(gdb)


How can I solve this?

Btw.: This error is repeatable and I saw the same error with the
release OL2.4.33.


Thanks Meike