Public bug reported:
I have a slapd problem on a freshly installed 16.04 machine:
slapd[17107]: segfault at 1a ip 00007f3c12c79f55 sp 00007f3c03c2d080
error 4 in libsasl2.so.2.0.25[7f3c12c72000+19000]
I'm using the server as Slave LDAP-Server and sync replication with kerberos
authentication.
The service either starts and runs successfully or it fails with segmentation
fault or 100% CPU.
Maybe an useful info, I'm replicating two databases. When I deactivate syncrepl
for one of them (doesn't matter which one) the problem is not occuring.
Linux xxx 4.4.0-75-generic #96-Ubuntu SMP Thu Apr 20 09:56:33 UTC 2017 x86_64
x86_64 x86_64 GNU/Linux
slapd 2.4.42+dfsg-2ubuntu3.1
libsasl2-2:amd64 2.1.26.dfsg1-14build1
libsasl2-modules:amd64 2.1.26.dfsg1-14build1
libsasl2-modules-gssapi-mit:amd64 2.1.26.dfsg1-14build1
GDB debug:
Starting program: /usr/sbin/slapd -h "ldap:/// ldaps:/// ldapi:///" -u openldap
-g openldap -f /etc/ldap/slapd.conf -d 256
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
590c82ab @(#) $OpenLDAP: slapd (Ubuntu) (May 11 2016 16:12:05) $
buildd@lgw01-10:/build/openldap-mF7Kfq/openldap-2.4.42+dfsg/debian/build/servers/slapd
590c82ab slapd starting
[New Thread 0x7f2e96b7b700 (LWP 42139)]
[New Thread 0x7f2e9637a700 (LWP 42140)]
[New Thread 0x7f2e95b79700 (LWP 42141)]
[New Thread 0x7f2e95378700 (LWP 42142)]
[New Thread 0x7f2e94b77700 (LWP 42143)]
590c82ba slap_client_connect: URI=ldap://xxx ldap_sasl_interactive_bind_s
failed (-6)
590c82ba do_syncrepl: rid=132 rc -6 retrying (9 retries left)
Thread 4 "slapd" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7f2e95b79700 (LWP 42141)]
0x00007f2ea53035b5 in sasl_client_add_plugin () from
/usr/lib/x86_64-linux-gnu/libsasl2.so.2
(gdb) thr apply all bt
Thread 6 (Thread 0x7f2e94b77700 (LWP 42143)):
#0 pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1 0x00007f2ea59463f3 in ?? () from
/usr/lib/x86_64-linux-gnu/libldap_r-2.4.so.2
#2 0x00007f2ea487c6ba in start_thread (arg=0x7f2e94b77700) at
pthread_create.c:333
#3 0x00007f2ea45b282d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109
Thread 5 (Thread 0x7f2e95378700 (LWP 42142)):
#0 pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1 0x00007f2ea59463f3 in ?? () from
/usr/lib/x86_64-linux-gnu/libldap_r-2.4.so.2
#2 0x00007f2ea487c6ba in start_thread (arg=0x7f2e95378700) at
pthread_create.c:333
#3 0x00007f2ea45b282d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109
Thread 4 (Thread 0x7f2e95b79700 (LWP 42141)):
#0 0x00007f2ea53035b5 in sasl_client_add_plugin () from
/usr/lib/x86_64-linux-gnu/libsasl2.so.2
#1 0x00007f2ea530f250 in ?? () from /usr/lib/x86_64-linux-gnu/libsasl2.so.2
#2 0x00007f2ea5303d69 in sasl_client_init () from
/usr/lib/x86_64-linux-gnu/libsasl2.so.2
#3 0x00007f2ea594da6c in ldap_int_sasl_init () from
/usr/lib/x86_64-linux-gnu/libldap_r-2.4.so.2
#4 0x00007f2ea594db2c in ldap_int_sasl_open () from
/usr/lib/x86_64-linux-gnu/libldap_r-2.4.so.2
#5 0x00007f2ea594e2d4 in ldap_int_sasl_bind () from
/usr/lib/x86_64-linux-gnu/libldap_r-2.4.so.2
#6 0x00007f2ea5951828 in ldap_sasl_interactive_bind () from
/usr/lib/x86_64-linux-gnu/libldap_r-2.4.so.2
#7 0x00007f2ea5951a4e in ldap_sasl_interactive_bind_s () from
/usr/lib/x86_64-linux-gnu/libldap_r-2.4.so.2
#8 0x0000561fbc556db4 in slap_client_connect (ldp=0x561fbe1e9f68,
sb=0x561fbe1e9d40) at ../../../../servers/slapd/config.c:2063
#9 0x0000561fbc5c699d in do_syncrep1 (si=0x561fbe1e9d10, op=0x7f2e95b787b0) at
../../../../servers/slapd/syncrepl.c:618
#10 do_syncrepl (ctx=<optimized out>, arg=0x561fbe1e5620) at
../../../../servers/slapd/syncrepl.c:1548
#11 0x00007f2ea59463a2 in ?? () from
/usr/lib/x86_64-linux-gnu/libldap_r-2.4.so.2
#12 0x00007f2ea487c6ba in start_thread (arg=0x7f2e95b79700) at
pthread_create.c:333
#13 0x00007f2ea45b282d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109
Thread 3 (Thread 0x7f2e9637a700 (LWP 42140)):
---Type <return> to continue, or q <return> to quit---
#0 pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1 0x00007f2ea59463f3 in ?? () from
/usr/lib/x86_64-linux-gnu/libldap_r-2.4.so.2
#2 0x00007f2ea487c6ba in start_thread (arg=0x7f2e9637a700) at
pthread_create.c:333
#3 0x00007f2ea45b282d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109
Thread 2 (Thread 0x7f2e96b7b700 (LWP 42139)):
#0 0x00007f2ea45b2e23 in epoll_wait () at ../sysdeps/unix/syscall-template.S:84
#1 0x0000561fbc55a8f0 in slapd_daemon_task (ptr=<optimized out>) at
../../../../servers/slapd/daemon.c:2539
#2 0x00007f2ea487c6ba in start_thread (arg=0x7f2e96b7b700) at
pthread_create.c:333
#3 0x00007f2ea45b282d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109
Thread 1 (Thread 0x7f2ea5d96740 (LWP 42138)):
#0 0x00007f2ea487d98d in pthread_join (threadid=139838073845504,
thread_return=0x0) at pthread_join.c:90
#1 0x0000561fbc55cc81 in slapd_daemon () at
../../../../servers/slapd/daemon.c:2932
#2 0x0000561fbc543bea in main (argc=11, argv=<optimized out>) at
../../../../servers/slapd/main.c:1017
(gdb)
** Affects: openldap (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1688575
Title:
Segmentation fault on a slave slapd (sync replication with kerberos
authentication)
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