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How To Fix symbol lookup error: /usr/sbin/httpd2-prefork: undefined symbol: apr_ldap_ssl_init


Posted by Artem Russakovskii on July 29th, 2008 in Linux

Apache stopped starting today for no apparent reason. 

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rcapache2 restart                            
/usr/sbin/httpd2-prefork: symbol lookup error: /usr/sbin/httpd2-prefork: undefined symbol: apr_ldap_ssl_init
Starting httpd2 (prefork) /usr/sbin/httpd2-prefork: symbol lookup error: /usr/sbin/httpd2-prefork: undefined symbol: apr_ldap_ssl_init
 
The command line was:
/usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf -DSSL
                                                                      failed

So I tried reinstalling libapr and apache2-utils related stuff with no luck. ldconfig didn't help either. It's not until I looked at /usr/lib and relinked a few things that it started working. What the hell, SUSE? 

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/usr/lib # l libapr*
-rw-r--r-- 1 root root 239306 2007-09-21 23:41 libapr-1.a
-rw-r--r-- 1 root root    821 2007-09-21 23:41 libapr-1.la
lrwxrwxrwx 1 root root     17 2008-07-30 00:21 libapr-1.so -> libapr-1.so.0.2.9*
lrwxrwxrwx 1 root root     18 2008-07-30 00:21 libapr-1.so.0 -> libapr-1.so.0.2.12*
-rwxr-xr-x 1 root root 543841 2008-07-29 23:47 libapr-1.so.0.2.12*
-rwxr-xr-x 1 root root 148372 2007-09-21 23:41 libapr-1.so.0.2.9*
-rw-r--r-- 1 root root 156300 2007-09-23 13:33 libaprutil-1.a
-rw-r--r-- 1 root root    912 2007-09-23 13:33 libaprutil-1.la
lrwxrwxrwx 1 root root     21 2008-07-30 00:22 libaprutil-1.so -> libaprutil-1.so.0.2.9*
lrwxrwxrwx 1 root root     22 2008-07-30 00:21 libaprutil-1.so.0 -> libaprutil-1.so.0.2.12*
-rwxr-xr-x 1 root root 291520 2008-07-29 23:47 libaprutil-1.so.0.2.12*
-rwxr-xr-x 1 root root  98148 2007-09-23 13:33 libaprutil-1.so.0.2.9*
 
/usr/lib # ln -sf libaprutil-1.so.0.2.9 libaprutil-1.so.0
/usr/lib # ln -sf libapr-1.so.0.2.9 libapr-1.so.0
 
/usr/lib # l libapr*
-rw-r--r-- 1 root root 239306 2007-09-21 23:41 libapr-1.a
-rw-r--r-- 1 root root    821 2007-09-21 23:41 libapr-1.la
lrwxrwxrwx 1 root root     18 2008-07-30 00:34 libapr-1.so -> libapr-1.so.0.2.9*
lrwxrwxrwx 1 root root     18 2008-07-30 00:21 libapr-1.so.0 -> libapr-1.so.0.2.9*
-rwxr-xr-x 1 root root 543841 2008-07-29 23:47 libapr-1.so.0.2.12*
-rwxr-xr-x 1 root root 148372 2007-09-21 23:41 libapr-1.so.0.2.9*
-rw-r--r-- 1 root root 156300 2007-09-23 13:33 libaprutil-1.a
-rw-r--r-- 1 root root    912 2007-09-23 13:33 libaprutil-1.la
lrwxrwxrwx 1 root root     21 2008-07-30 00:35 libaprutil-1.so -> libaprutil-1.so.0.2.9*
lrwxrwxrwx 1 root root     21 2008-07-30 00:35 libaprutil-1.so.0 -> libaprutil-1.so.0.2.9*
-rwxr-xr-x 1 root root 291520 2008-07-29 23:47 libaprutil-1.so.0.2.12*
-rwxr-xr-x 1 root root  98148 2007-09-23 13:33 libaprutil-1.so.0.2.9*
 
/usr/lib # rcapache2 restart
Syntax OK
Shutting down httpd2 (waiting for all children to terminate)          done
Starting httpd2 (prefork)                                             done

Voila, apache starts now. Grrr, why linker, why??

● ● ●
Artem Russakovskii is a San Francisco programmer and blogger. Follow Artem on Twitter (@ArtemR) or subscribe to the RSS feed.

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