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(ITS#6858) segfault on schema modification in cn=config

Full_Name: Sebastian Zerbe
Version: 2.4.23-7
OS: Debian GNU/Linux 6.0
URL: ftp://ftp.openldap.org/incoming/sebastian-zerbe-110309.tar.gz
Submission from: (NULL) (

Trying to modify the local schema cn={5}philfak,cn=schema,cn=config with the
given ldif-file modify_phil_schema.ldif using "ldapmodify -x -D
cn=admin,cn=config -W -f modify_phil_schema.ldif" results in a slapd crash with
kernel log entries like these:

[3451954.217075] slapd[2593]: segfault at 70 ip 080bd73f sp ae5f9910 error 4 in
[3451972.088717] slapd[5716]: segfault at 70 ip 080bd73f sp b1bfe910 error 4 in
[3452718.916547] slapd[5830]: segfault at 70 ip 080bd73f sp b1992910 error 4 in

Further debugging is nearly impossible. If slapd is running in gdb it does not
crash (but the modifications do not take place either)...