Full_Name: Stefan Wold Version: 2.4.31 OS: Ubuntu and Lunar Linux URL: Submission from: (NULL) (77.238.32.111)

I can reproduce a sig abort crash in both Ubuntu and Lunar Linux using OpenLDAP 2.4.31. This crash only seem occur when I run ~20 concurrent ldap searches using -YGSSAPI for authentication, using simple bind (-x) I can't reproduce the crash. Usually slapd crash within a couple of hours using GSSAPI. My test case is quite simple, I start 20 threads that loop the following command: ldapsearch -h server -YGSSAPI uid=user In Ubuntu openldap is linked against cyrus-sasl which links to MIT kerberos. In Lunar Linux cyrus-sasl is linked against heimdal. In this case it doesn't seem to matter which kerberos implementation is used.

Here's a brief gdb backtrace:

Core was generated by `/usr/lib/slapd -d 0 -h ldap:/// ldaps:/// -f /etc/openldap/slapd.conf'. Program terminated with signal 6, Aborted. #0 0x00007f70313293c5 in raise () from /lib/libc.so.6 (gdb) bt #0 0x00007f70313293c5 in raise () from /lib/libc.so.6 #1 0x00007f703132a83b in abort () from /lib/libc.so.6 #2 0x00007f703132226e in __assert_fail_base () from /lib/libc.so.6 #3 0x00007f7031322312 in __assert_fail () from /lib/libc.so.6 #4 0x00000000004310e7 in slap_listener (sl=0x15c30d0) at daemon.c:1891 #5 0x0000000000431109 in slap_listener_thread (ctx=<optimized out>, ptr=<optimized out>) at daemon.c:2093 #6 0x00007f7032e7dcda in ldap_int_thread_pool_wrapper (xpool=0x15ff920) at tpool.c:688 #7 0x00007f703165cce0 in start_thread () from /lib/libpthread.so.0 #8 0x00007f70313c7abd in clone () from /lib/libc.so.6

For a full backtrace: https://gist.github.com/a82d5b3dfdac7abc8e27