This is most likely the same as ITS#5439, fixed in HEAD/RE24/2.4.9. Please test against a more recent release.

adejong@debian.org wrote:

Full_Name: Arthur de Jong Version: 2.4.7 OS: Debian unstable URL: http://arthurenhella.demon.nl/nss-ldapd/adejong-slapd-crash.log Submission from: (NULL) (83.160.165.27)

This has also been submitted as a Debian bug: http://bugs.debian.org/479237

My test slapd consistently crashes when doing multiple simultaneous requests in different threads. Each thread has it's own LDAP *ld connection to the LDAP server which is supposed to be supported [1]. In any case this shouldn't crash the LDAP server.

[1] http://www.openldap.org/lists/openldap-software/200606/msg00252.html

This problem arises in my test suite for nss-ldapd. Source can be checked out at http://arthurenhella.demon.nl/svn/nss-ldapd/ (svn) and the test file is (test/test_myldap.c). It uses a wrapper module (myldap) around calls to OpenLDAP to simplify memory management. The function that triggers the crash is test_threads().

I have captured the crash in gdb:

# gdb /usr/sbin/slapd GNU gdb 6.8-debian [...] This GDB was configured as "i486-linux-gnu"... (gdb) r -d 1 -h ldap:/// ldaps:/// ldapi:/// -g openldap -u openldap -f /etc/ldap/slapd.conf Starting program: /usr/sbin/slapd -d 1 -h ldap:/// ldaps:/// ldapi:/// -g openldap -u openldap -f /etc/ldap/slapd.conf [Thread debugging using libthread_db enabled] [New Thread 0xb7b3a930 (LWP 1542)] @(#) $OpenLDAP: slapd 2.4.7 (Apr 16 2008 08:13:31) $ @minerva.hungry.com:/home/pere/src/debiancvs/initscripts-ng-svn/trunk/src/insserv/openldap2.3-2.4.7/debian/build/servers/slapd ldap_pvt_gethostbyname_a: host=sorbet, r=0 daemon_init: listen on ldap:/// daemon_init: 1 listeners to open... &#65279;[...] <= send_search_entry: conn 2 exit. entry_decode: "cn=Zaka Eddins+uid=zeddins,ou=lotsofpeople,dc=test,dc=tld" <= entry_decode(cn=Zaka Eddins+uid=zeddins,ou=lotsofpeople,dc=test,dc=tld) => send_search_entry: conn 2 dn="cn=Zaka Eddins+uid=zeddins,ou=lotsofpeople,dc=test,dc=tld" ber_flush2: 107 bytes to sd 18 <= send_search_entry: conn 2 exit. entry_decode: "uid=wvakil,ou=lotsofpeople,dc=test,dc=tld" <= entry_decode(uid=wvakil,ou=lotsofpeople,dc=test,dc=tld) => send_search_entry: conn 2 dn="uid=wvakil,ou=lotsofpeople,dc=test,dc=tld" ber_flush2: 90 bytes to sd 18 <= send_search_entry: conn 2 exit. entry_decode: "uid=zmeeker,ou=lotsofpeople,dc=test,dc=tld" <= entry_decode(uid=zmeeker,ou=lotsofpeople,dc=test,dc=tld) => send_search_entry: conn 2 dn="uid=zmeeker,ou=lotsofpeople,dc=test,dc=tld" ber_flush2: 92 bytes to sd 18 <= send_search_entry: conn 2 exit. bdb_search: 1104 scope not okay

Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 0xb5f18b90 (LWP 5017)] 0xb7cef160 in pthread_mutex_lock () from /lib/libpthread.so.0 (gdb) bt #0 0xb7cef160 in pthread_mutex_lock () from /lib/libpthread.so.0 #1 0xb7f4351d in ldap_pvt_thread_mutex_lock () from /usr/lib/libldap_r-2.4.so.2 #2 0xb783883d in bdb_cache_return_entry_rw (bdb=0x81ea358, e=0x820922c, rw=0, lock=0xb5f16fd4) at /home/pere/src/debiancvs/initscripts-ng-svn/trunk/src/insserv/openldap2.3-2.4.7/servers/slapd/back-bdb/cache.c:256 #3 0xb782ce12 in bdb_search (op=0x8299b10, rs=0xb5f18168) at /home/pere/src/debiancvs/initscripts-ng-svn/trunk/src/insserv/openldap2.3-2.4.7/servers/slapd/back-bdb/search.c:909 #4 0x08077d13 in fe_op_search (op=0x8299b10, rs=0xb5f18168) at /home/pere/src/debiancvs/initscripts-ng-svn/trunk/src/insserv/openldap2.3-2.4.7/servers/slapd/search.c:368 #5 0x0807853c in do_search (op=0x8299b10, rs=0xb5f18168) at /home/pere/src/debiancvs/initscripts-ng-svn/trunk/src/insserv/openldap2.3-2.4.7/servers/slapd/search.c:217 #6 0x080757c6 in connection_operation (ctx=0xb5f18248, arg_v=0x8299b10) at /home/pere/src/debiancvs/initscripts-ng-svn/trunk/src/insserv/openldap2.3-2.4.7/servers/slapd/connection.c:1083 #7 0x08075ed6 in connection_read_thread (ctx=0xb5f18248, argv=0x13) at /home/pere/src/debiancvs/initscripts-ng-svn/trunk/src/insserv/openldap2.3-2.4.7/servers/slapd/connection.c:1210 #8 0xb7f42a44 in ?? () from /usr/lib/libldap_r-2.4.so.2 #9 0xb5f18248 in ?? () #10 0x00000013 in ?? () #11 0x00000000 in ?? ()

A more detailed backtrace is available at the url specified below.