Thanks My application is multithread. I've had a call to ldap_get_option(NULL, LDAP_OPT_API_INFO, &ldapi) before spawning threads, but here the crash occurred also in ldap_initailize but in ldap_ld_free(). I addition, I won't call ldap outside my thread. The full stack trace is : #0 0xb7e93473 in strlen () from /lib/tls/i686/cmov/libc.so.6 #1 0xb3a191f9 in ber_strdup_x (s=0x6a626f28 <Address 0x6a626f28 out of bounds>, ctx=0x0) at memory.c:640 #2 0xadd2fd66 in ldap_charray_dup (a=0xb313a324) at charray.c:164 #3 0xadd26883 in ldap_url_dup (ludp=0x8b83798) at url.c:1191 #4 0xadd26912 in ldap_url_duplist (ludlist=0x8b83798) at url.c:1217 #5 0xadd11b34 in ldap_create (ldp=0xb32e0dc8) at open.c:149 #6 0xadd11de1 in ldap_initialize (ldp=0xb32e0ec0, url=0x8946d20 "ldap://ldap:389") at open.c:225 I have same thing with the 2.3.38 Damien Doiselet Pierangelo Masarati a écrit :