Everything is in the title:

slapd on master branch segfaults at first connection establishment with an LDAP client

slapd-2.5.X-Devel

Compilation options:

./configure --prefix=/usr/local/openldap --libdir=/usr/local/openldap/lib64 --enable-overlays --enable-modules --enable-dynamic=yes --with-tls=openssl --enable-debug --with-cyrus-sasl --enable-spasswd --enable-ppolicy --enable-crypt --enable-ldap -enable-slapi --enable-meta --enable-sock --enable-wrappers --enable-rlookups

using default slapd.conf file:

#
# See slapd.conf(5) for details on configuration options.
# This file should NOT be world readable.
#
include         /usr/local/openldap/etc/openldap/schema/core.schema

# Define global ACLs to disable default read access.

# Do not enable referrals until AFTER you have a working directory
# service AND an understanding of referrals.
#referral       ldap://root.openldap.org

pidfile         /usr/local/openldap/var/run/slapd.pid
argsfile        /usr/local/openldap/var/run/slapd.args

# Load dynamic backend modules:
# modulepath    /usr/local/openldap/libexec/openldap
# moduleload    back_mdb.la
# moduleload    back_ldap.la

# Sample security restrictions
#       Require integrity protection (prevent hijacking)
#       Require 112-bit (3DES or better) encryption for updates
#       Require 63-bit encryption for simple bind
# security ssf=1 update_ssf=112 simple_bind=64

# Sample access control policy:
#       Root DSE: allow anyone to read it
#       Subschema (sub)entry DSE: allow anyone to read it
#       Other DSEs:
#               Allow self write access
#               Allow authenticated users read access
#               Allow anonymous users to authenticate
#       Directives needed to implement policy:
# access to dn.base="" by * read
# access to dn.base="cn=Subschema" by * read
# access to *
#       by self write
#       by users read
#       by anonymous auth
#
# if no access controls are present, the default policy
# allows anyone and everyone to read anything but restricts
# updates to rootdn.  (e.g., "access to * by * read")
#
# rootdn can always read and write EVERYTHING!

#######################################################################
# MDB database definitions
#######################################################################

database        mdb
maxsize         1073741824
suffix          "dc=my-domain,dc=com"
rootdn          "cn=Manager,dc=my-domain,dc=com"
# Cleartext passwords, especially for the rootdn, should
# be avoid.  See slappasswd(8) and slapd.conf(5) for details.
# Use of strong authentication encouraged.
rootpw          secret
# The database directory MUST exist prior to running slapd AND 
# should only be accessible by the slapd and slap tools.
# Mode 700 recommended.
directory       /usr/local/openldap/var/openldap-data
# Indices to maintain
index   objectClass     eq


For information, I also converted this configuration into cn=config with the same result.


some commands after installation:
mkdir /usr/local/openldap/var/openldap-data
chown -R ldap:ldap /usr/local/openldap

Launch command:

/usr/local/openldap/libexec/slapd -h 'ldap://*:389 ldaps://*:636' -f /usr/local/openldap/etc/openldap/slapd.conf -u ldap -g ldap -d -1


Establish connection with any client with manager credential on 389 port.


Console output:

6036a1a3 daemon: activity on 1 descriptor
6036a1a3 daemon: activity on:
6036a1a3 slap_listener_activate(7): 
6036a1a3 daemon: epoll: listen=7 busy
6036a1a3 daemon: epoll: listen=8 active_threads=0 tvp=NULL
6036a1a3 daemon: epoll: listen=9 active_threads=0 tvp=NULL
6036a1a3 daemon: epoll: listen=10 active_threads=0 tvp=NULL
6036a1a3 >>> slap_listener(ldap://*:389)
6036a1a3 daemon: accept() = 14
6036a1a3 daemon: activity on 1 descriptor
6036a1a3 daemon: activity on:
6036a1a3 daemon: epoll: listen=7 active_threads=0 tvp=NULL
6036a1a3 daemon: epoll: listen=8 active_threads=0 tvp=NULL
6036a1a3 daemon: epoll: listen=9 active_threads=0 tvp=NULL
6036a1a3 daemon: epoll: listen=10 active_threads=0 tvp=NULL
6036a1a3 daemon: listen=7, new connection on 14
Erreur de segmentation