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Re: (ITS#5494) slapd crashed when accessed by multiple threads
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...
> [...]
> <= 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.
>
>
>
--
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/