If you are getting error as mentioned below while doing some operation your linux server bash shell.
../../../libraries/libldap/error.c:273: ldap_parse_result: Assertion `r != ((void *)0)’ failed

Then its due to nss-ldap software running on your server. One of the reason I found and fixed with was nscd service was down on my server restarting it fixed the issue.

Error I saw in logs were..

/var/log/messages:

Oct 28 03:01:27 HOSTNAME nscd: nss_ldap: reconnected to LDAP server ldap://domain.com/ after 1 attempt
Nov 10 02:49:58 HOSTNAME nscd: nss_ldap: reconnecting to LDAP server (sleeping 4 seconds)…
Nov 10 02:50:14 HOSTNAME nscd: nss_ldap: reconnected to LDAP server ldap://domain.com/ after 2 attempts
Jan 18 07:45:09 HOSTNAME kernel: nscd[5114]: segfault at 00002b1c735dee78 rip 00002b1b6d4fe885 rsp 000000004185c6d0 error 4

Fix :
[root@HOSTNAME webdocs]# /etc/init.d/nscd status
nscd dead but subsys locked
You have new mail in /var/spool/mail/root
[root@HOSTNAME webdocs]# /etc/init.d/nscd restart
Stopping nscd: [FAILED]
Starting nscd: [ OK ]
[root@HOSTNAME webdocs]# /etc/init.d/nscd status
nscd (pid 30292) is running…
You have new mail in /var/spool/mail/root
[root@HOSTNAME webdocs]#