Ok i have downloaded all the debuginfo package on my RHEL6.2 server, and also i have to install with "--nodeps" options the package glibc-debuginfo-2.12-1.47.el6_2.12.x86_64.rpm because it require the glibc-debuginfo-common rpm package which do not found on Redhat website. Here is now the result : # gdb /usr/local/openldap/libexec/slapd 12945 GNU gdb (GDB) Red Hat Enterprise Linux (7.2-50.el6) Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-redhat-linux-gnu". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>;... Reading symbols from /usr/local/openldap/libexec/slapd...Reading symbols from /usr/lib/debug/usr/local/openldap/libexec/slapd.debug...done. done. Attaching to program: /usr/local/openldap/libexec/slapd, process 12945 Reading symbols from /usr/local/berkeleydb/lib64/libdb-4.6.so...Reading symbols from /usr/lib/debug/usr/local/berkeleydb/lib64/libdb-4.6.so.debug... warning: "/usr/lib/debug/usr/local/berkeleydb/lib64/libdb-4.6.so.debug": separate debug info file has no debug info (no debugging symbols found)...done. (no debugging symbols found)...done. Loaded symbols for /usr/local/berkeleydb/lib64/libdb-4.6.so Reading symbols from /lib64/libpthread.so.0...Reading symbols from /usr/lib/debug/lib64/libpthread-2.12.so.debug...done. [Thread debugging using libthread_db enabled] [New Thread 0x7f823ed22700 (LWP 12947)] done. Loaded symbols for /lib64/libpthread.so.0 Reading symbols from /usr/lib64/libsasl2.so.2...Reading symbols from /usr/lib/debug/usr/lib64/libsasl2.so.2.0.23.debug...done. done. Loaded symbols for /usr/lib64/libsasl2.so.2 Reading symbols from /usr/lib64/libssl.so.10...Reading symbols from /usr/lib/debug/usr/lib64/libssl.so.1.0.0.debug...done. done. Loaded symbols for /usr/lib64/libssl.so.10 Reading symbols from /usr/lib64/libcrypto.so.10...Reading symbols from /usr/lib/debug/usr/lib64/libcrypto.so.1.0.0.debug...done. done. Loaded symbols for /usr/lib64/libcrypto.so.10 Reading symbols from /lib64/libcrypt.so.1...Reading symbols from /usr/lib/debug/lib64/libcrypt-2.12.so.debug...done. done. Loaded symbols for /lib64/libcrypt.so.1 Reading symbols from /lib64/libresolv.so.2...Reading symbols from /usr/lib/debug/lib64/libresolv-2.12.so.debug...done. done. Loaded symbols for /lib64/libresolv.so.2 Reading symbols from /usr/lib64/libltdl.so.7...Reading symbols from /usr/lib/debug/usr/lib64/libltdl.so.7.2.1.debug...done. done. Loaded symbols for /usr/lib64/libltdl.so.7 Reading symbols from /lib64/libc.so.6...Reading symbols from /usr/lib/debug/lib64/libc-2.12.so.debug...done. done. Loaded symbols for /lib64/libc.so.6 Reading symbols from /lib64/ld-linux-x86-64.so.2...Reading symbols from /usr/lib/debug/lib64/ld-2.12.so.debug...done. done. Loaded symbols for /lib64/ld-linux-x86-64.so.2 Reading symbols from /lib64/libdl.so.2...Reading symbols from /usr/lib/debug/lib64/libdl-2.12.so.debug...done. done. Loaded symbols for /lib64/libdl.so.2 Reading symbols from /lib64/libgssapi_krb5.so.2...Reading symbols from /usr/lib/debug/lib64/libgssapi_krb5.so.2.2.debug...done. done. Loaded symbols for /lib64/libgssapi_krb5.so.2 Reading symbols from /lib64/libkrb5.so.3...Reading symbols from /usr/lib/debug/lib64/libkrb5.so.3.3.debug...done. done. Loaded symbols for /lib64/libkrb5.so.3 Reading symbols from /lib64/libcom_err.so.2...Reading symbols from /usr/lib/debug/lib64/libcom_err.so.2.1.debug...done. done. Loaded symbols for /lib64/libcom_err.so.2 Reading symbols from /lib64/libk5crypto.so.3...Reading symbols from /usr/lib/debug/lib64/libk5crypto.so.3.1.debug...done. done. Loaded symbols for /lib64/libk5crypto.so.3 Reading symbols from /lib64/libz.so.1...Reading symbols from /usr/lib/debug/lib64/libz.so.1.2.3.debug...done. done. Loaded symbols for /lib64/libz.so.1 Reading symbols from /lib64/libfreebl3.so...Reading symbols from /usr/lib/debug/lib64/libfreebl3.so.debug...done. done. Loaded symbols for /lib64/libfreebl3.so Reading symbols from /lib64/libkrb5support.so.0...Reading symbols from /usr/lib/debug/lib64/libkrb5support.so.0.1.debug...done. done. Loaded symbols for /lib64/libkrb5support.so.0 Reading symbols from /lib64/libkeyutils.so.1...Reading symbols from /usr/lib/debug/lib64/libkeyutils.so.1.3.debug...done. done. Loaded symbols for /lib64/libkeyutils.so.1 Reading symbols from /lib64/libselinux.so.1...Reading symbols from /usr/lib/debug/lib64/libselinux.so.1.debug...done. done. Loaded symbols for /lib64/libselinux.so.1 Reading symbols from /lib64/libnss_files.so.2...Reading symbols from /usr/lib/debug/lib64/libnss_files-2.12.so.debug...done. done. Loaded symbols for /lib64/libnss_files.so.2 Reading symbols from /usr/lib64/sasl2/libsasldb.so...Reading symbols from /usr/lib/debug/usr/lib64/sasl2/libsasldb.so.2.0.23.debug...done. done. Loaded symbols for /usr/lib64/sasl2/libsasldb.so Reading symbols from /lib64/libdb-4.7.so...Reading symbols from /usr/lib/debug/lib64/libdb-4.7.so.debug...done. done. Loaded symbols for /lib64/libdb-4.7.so Reading symbols from /usr/lib64/sasl2/libanonymous.so...Reading symbols from /usr/lib/debug/usr/lib64/sasl2/libanonymous.so.2.0.23.debug...done. done. Loaded symbols for /usr/lib64/sasl2/libanonymous.so 0x0000003a00c0804d in pthread_join (threadid=140197376435968, thread_return=0x0) at pthread_join.c:89 89 lll_wait_tid (pd->tid); (gdb) backtrace full #0 0x0000003a00c0804d in pthread_join (threadid=140197376435968, thread_return=0x0) at pthread_join.c:89 __ignore = -512 _tid = 12947 _buffer = {__routine = 0x3a00c07f20 <cleanup>, __arg = 0x7f823ed22d28, __canceltype = 1053960656, __prev = 0x0} oldtype = 0 pd = 0x7f823ed22700 self = 0x7f8281c967c0 result = 0 #1 0x000000000043a0e9 in slapd_daemon () at daemon.c:2929 i = <value optimized out> rc = <value optimized out> #2 0x0000000000426435 in main (argc=11, argv=<value optimized out>) at main.c:1012 i = <value optimized out> no_detach = 0 rc = -12 urls = 0x1aad010 "ldap://*:25389 ldaps://*:25636" username = 0x1aad080 "root" groupname = 0x1aad0a0 "\026\065U" sandbox = 0x0 syslogUser = 160 pid = <value optimized out> waitfds = {9, 10} g_argc = 11 g_argv = <value optimized out> configfile = 0x0 configdir = 0x1aad040 "/usr/local/openldap/etc/openldap/slapd.d" serverName = <value optimized out> scp = <value optimized out> scp_entry = <value optimized out> debug_unknowns = 0x0 syslog_unknowns = 0x0 serverNamePrefix = <value optimized out> slapd_pid_file_unlink = 1 slapd_args_file_unlink = 1 firstopt = <value optimized out> __PRETTY_FUNCTION__ = "main" (gdb) continue Continuing. [New Thread 0x7f823e521700 (LWP 11522)] [New Thread 0x7f823dd20700 (LWP 11523)] Program received signal SIGABRT, Aborted. [Switching to Thread 0x7f823e521700 (LWP 11522)] 0x0000003a00432885 in raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64 64 return INLINE_SYSCALL (tgkill, 3, pid, selftid, sig); (gdb) backtrace full #0 0x0000003a00432885 in raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64 resultvar = 0 pid = 12945 selftid = 11522 #1 0x0000003a00434065 in abort () at abort.c:92 save_stage = 2 act = {__sigaction_handler = {sa_handler = 0x5dc95e, sa_sigaction = 0x5dc95e}, sa_mask = {__val = {249113688989, 140197368029312, 0, 140197368029552, 249112713062, 206158430232, 140197368029568, 140197368029344, 249112620008, 206158430256, 140197368029600, 140197128851280, 117, 117, 0, 140736009787411}}, sa_flags = 5579917, sa_restorer = 0x5dc857} sigs = {__val = {32, 0 <repeats 15 times>}} #2 0x0000003a0042b9fe in __assert_fail_base (fmt=<value optimized out>, assertion=0x5dc95e "!((rs->sr_err)<0)", file=0x5dc857 "result.c", line=<value optimized out>, function=<value optimized out>) at assert.c:96 str = 0x7f8230104f50 "" total = 4096 #3 0x0000003a0042bac0 in __assert_fail (assertion=0x5dc95e "!((rs->sr_err)<0)", file=0x5dc857 "result.c", line=813, function=0x5dcb40 "slap_send_ldap_result") at assert.c:105 No locals. #4 0x0000000000450bed in slap_send_ldap_result (op=0x7f8230002660, rs=0x7f823e520950) at result.c:813 tmp = 0x0 otext = 0x7f823e51f394 "" oref = 0x0 __PRETTY_FUNCTION__ = "slap_send_ldap_result" #5 0x000000000042d567 in config_back_modify (op=<value optimized out>, rs=<value optimized out>) at bconfig.c:5926 cfb = <value optimized out> ce = <value optimized out> last = 0xd00000000 ml = <value optimized out> ca = {argc = 2, argv = 0x7f8230103ef0, argv_size = 513, line = 0x7f8230102bf0 "/dev/random", tline = 0x7f8230103ed0 "", fname = 0x5d1f79 "slapd", lineno = 0, log = "olcTLSRandFile: value #0", '\000' <repeats 4099 times>, reply = {err = 0, msg = '\000' <repeats 255 times>}, depth = 0, valx = -1, values = {v_int = 806375360, v_uint = 806375360, v_long = 140197128851392, v_ulong = 140197128851392, v_ber_t = 140197128851392, v_string = 0x7f8230104fc0 "/dev/random", v_bv = {bv_len = 140197128851392, bv_val = 0x0}, v_dn = {vdn_dn = { bv_len = 140197128851392, bv_val = 0x0}, vdn_ndn = {bv_len = 0, bv_val = 0x0}}, v_ad = 0x7f8230104fc0}, rvalue_vals = 0x0, rvalue_nvals = 0x0, op = 0, type = 4, ca_op = 0x7f8230002660, be = 0x88e960, bi = 0x0, ca_entry = 0x1b300d8, ca_private = 0x1b2f970, cleanup = 0x427a70 <config_tls_cleanup>, table = Cft_Global} rdn = {bv_len = 2, bv_val = 0x1b2fe30 "cn=config"} ptr = <value optimized out> rad = 0x1ada450 do_pause = <value optimized out> #6 0x000000000045745b in fe_op_modify (op=0x7f8230002660, rs=0x7f823e520950) at modify.c:303 update = <value optimized out> repl_user = <value optimized out> op_be = <value optimized out> bd = 0x88e960 textbuf = "8,\000\060\202\177", '\000' <repeats 18 times>, "\003\000\000\000\000\000\000\000\020/Z\000\000\000\000\000Â7Z\000\000\000\000\000`s¬\001\000\000\000\000ð\035\000\060\202\177\000\000\200ªG\000\000\000\000\000\066¢E\000\000\000\000\000\016\000\000\000\000\000\000\000+&\000\060\202\177", '\000' <repeats 18 times>, "\v\000\000\000\000\000\000\000ð+\020\060\202\177\000\000 +\000\060\202\177\000\000\020,\020\060\202\177\000\000\000\000\000\000\000\000\000\000\200\036¯\001", '\000' <repeats 28 times>, "\237nE\000\000\000\000\000\000\bR>\202\177\000\000p\tR>\202\177\000\000\000\001\000\000\000\000\000\000`&\000\060\202\177\000\000\210&\000\060\202\177\000\000\230&"... #7 0x0000000000457d86 in do_modify (op=0x7f8230002660, rs=0x7f823e520950) at modify.c:177 dn = {bv_len = 9, bv_val = 0x7f8230002617 "cn=config"} textbuf = "\027)\000\060\202\177\000\000Ð+\000\060\202\177\000\000\000\060\020\000\000\000\000\000\000@\000\000\000\000\000\000\000\020\002\000\000\000\000\000\060\000\020\000\000\000\000\000\004\000\000\000\000\000\000\000 \000\000\000\000\000\000\000\000\001\000\000\000\000\000\000\001\000\001\000\060@\000\000[\b\000\000\200\000\000\000\227\000\000\000n\001", '\000' <repeats 20 times>, "\020\000\000\000\000\000 \000\000\060\202\177\000\000\001\000\000\000\000\000\000\000°\nR>\202\177\000\000Ð'\000\060\202\177\000\000Ñ\227G\000:", '\000' <repeats 13 times>, "\020\000\000\000\000\000\001\000\000\000\000\000\000\000\031\001\\\000\000\000\000\000\000\000\020\000\000\000\000\000û\237E\000\000\000\000\000 +\000\060\202"... tmp = <value optimized out> #8 0x000000000043fb79 in connection_operation (ctx=0x7f823e520ab0, arg_v=0x7f8230002660) at connection.c:1155 rc = 80 cancel = <value optimized out> op = 0x7f8230002660 rs = {sr_type = REP_RESULT, sr_tag = 0, sr_msgid = 0, sr_err = -12, sr_matched = 0x0, sr_text = 0x7f823e51f394 "", ---Type <return> to continue, or q <return> to quit--- sr_ref = 0x0, sr_ctrls = 0x0, sr_un = {sru_search = {r_entry = 0x0, r_attr_flags = 0, r_operational_attrs = 0x0, r_attrs = 0x0, r_nentries = 0, r_v2ref = 0x0}, sru_sasl = {r_sasldata = 0x0}, sru_extended = {r_rspoid = 0x0, r_rspdata = 0x0}}, sr_flags = 0} tag = 102 opidx = SLAP_OP_MODIFY conn = 0x1bbad20 memctx = 0x7f8230002ba0 memctx_null = 0x0 memsiz = 1048576 __PRETTY_FUNCTION__ = "connection_operation" #9 0x0000000000440365 in connection_read_thread (ctx=0x7f823e520ab0, argv=<value optimized out>) at connection.c:1291 rc = <value optimized out> cri = {op = 0x7f8230002660, func = 0, arg = 0x0, ctx = 0x7f823e520ab0, nullop = <value optimized out>} s = <value optimized out> #10 0x0000000000595b80 in ldap_int_thread_pool_wrapper (xpool=0x1add680) at tpool.c:688 pool = 0x1add680 task = 0x7f8238000a20 work_list = <value optimized out> ctx = {ltu_id = 140197368043264, ltu_key = {{ltk_key = 0x43e990, ltk_data = 0x7f8230002a90, ltk_free = 0x43ea60 <conn_counter_destroy>}, {ltk_key = 0x492f40, ltk_data = 0x7f8230002ba0, ltk_free = 0x492f60 <slap_sl_mem_destroy>}, {ltk_key = 0x0, ltk_data = 0x0, ltk_free = 0} <repeats 27 times>, { ltk_key = 0x0, ltk_data = 0x3a00c07e8a, ltk_free = 0}, {ltk_key = 0x0, ltk_data = 0x0, ltk_free = 0}, { ltk_key = 0x0, ltk_data = 0x0, ltk_free = 0}}} kctx = <value optimized out> keyslot = 936 hash = <value optimized out> __PRETTY_FUNCTION__ = "ldap_int_thread_pool_wrapper" #11 0x0000003a00c077f1 in start_thread (arg=0x7f823e521700) at pthread_create.c:301 __res = <value optimized out> pd = 0x7f823e521700 now = <value optimized out> unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140197368043264, -7363636271228307732, 140197376425120, 140197368043968, 0, 3, 7407127774185469676, -7369267418370066708}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = { prev = 0x0, cleanup = 0x0, canceltype = 0}}} not_first_call = <value optimized out> pagesize_m1 = <value optimized out> sp = <value optimized out> freesize = <value optimized out> #12 0x0000003a004e5ccd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:115 No locals. (gdb) continue Continuing. [Thread 0x7f823dd20700 (LWP 11523) exited] [Thread 0x7f823e521700 (LWP 11522) exited] [Thread 0x7f823ed22700 (LWP 12947) exited] Program terminated with signal SIGABRT, Aborted. The program no longer exists. (gdb) quit Regards, Le 29/08/13, Aaron Richton <richton(a)nbcs.rutgers.edu&gt; a écrit : -- Frederic Poisson