Apache Startup Problems with mod_wsgi : Missing Symbols ap_cleanup_scoreboard and ap_accept_lock_mech

[Anurag Chourasia <anurag.chourasia@xxxxxxxxx>]

All,

I hope you could help me with a mod_wsgi load error upon startup of apache. This is affecting one of our site Go Live and I would appreciate any help offered in this regard. 

The error upon startup of Apache is as follows

root [zibal]% ./usr/local/apache2/bin/apachectl restart

httpd: Syntax error on line 53 of /usr/local/apache2/conf/httpd.conf:

Cannot load /usr/local/apache2/modules/mod_wsgi.so into server: 

rtld:0712-001 Symbol ap_cleanup_scoreboard was referenced from module /usr/local/apache2/modules/mod_wsgi.so(), but a runtime definition of the symbol was not found.

rtld: 0712-001 Symbol ap_accept_lock_mech was referenced from module /usr/local/apache2/modules/mod_wsgi.so(), but a runtime definition of the symbol was not found.

I am pasting the output of nm command on the apache executable and those symbols seem to exist.

root [zibal]% nm ./usr/local/apache2/bin/httpd | grep  ap_accept_lock_mech

ap_accept_lock_mech  D   536880332

ap_accept_lock_mech  d   536900392           4

ap_accept_lock_mech:G879 -           0

root [zibal]% nm ./usr/local/apache2/bin/httpd | grep ap_cleanup_scoreboard

.ap_cleanup_scoreboard T   268613428         212

ap_cleanup_scoreboard D   536890068

ap_cleanup_scoreboard d   536890068          12

ap_cleanup_scoreboard d   536899972           4

ap_cleanup_scoreboard:F385 -        2976

I am wondering if there is a way to statically link mod_wsgi into apache? Please guide.

I built Apache 2.2.17 and Mod_Wsgi 3.3 using the source and the compiler was gcc-4.2.

Here is the Apache Build Information

=====================================

root [zibal]% ./usr/local/apache2/bin/httpd -V

Server version: Apache/2.2.17 (Unix)

Server built:   Nov 18 2010 05:04:25

Server's Module Magic Number: 20051115:25

Server loaded:  APR 1.4.2, APR-Util 1.3.10

Compiled using: APR 1.4.2, APR-Util 1.3.10

Architecture:   32-bit

Server MPM:     Prefork

 threaded:     no

   forked:     yes (variable process count)

Server compiled with....

 -D APACHE_MPM_DIR="server/mpm/prefork"

 -D APR_HAS_SENDFILE

 -D APR_HAS_MMAP

 -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)

 -D APR_USE_SYSVSEM_SERIALIZE

 -D APR_USE_PTHREAD_SERIALIZE

 -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT

 -D APR_HAS_OTHER_CHILD

 -D AP_HAVE_RELIABLE_PIPED_LOGS

 -D DYNAMIC_MODULE_LIMIT=128

 -D HTTPD_ROOT="/usr/local/apache2"

 -D SUEXEC_BIN="/usr/local/apache2/bin/suexec"

 -D DEFAULT_PIDLOG="logs/httpd.pid"

 -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"

 -D DEFAULT_LOCKFILE="logs/accept.lock"

 -D DEFAULT_ERRORLOG="logs/error_log"

 -D AP_TYPES_CONFIG_FILE="conf/mime.types"

 -D SERVER_CONFIG_FILE="conf/httpd.conf"

Contents of config.nice file are as follows

++++++++++++++++++++++++

#! /bin/sh

#

# Created by configure

CC="gcc"; export CC

"./configure" \

"CC=gcc" \

"$@"

++++++++++++++++++++++++

Information about Apache Modules Loaded

=======================================

root [zibal]% ./usr/local/apache2/bin/httpd -l

Compiled in modules:

 core.c

 mod_authn_file.c

 mod_authn_default.c

 mod_authz_host.c

 mod_authz_groupfile.c

 mod_authz_user.c

 mod_authz_default.c

 mod_auth_basic.c

 mod_include.c

 mod_filter.c

 mod_log_config.c

 mod_env.c

 mod_setenvif.c

 mod_version.c

 prefork.c

 http_core.c

 mod_mime.c

 mod_status.c

 mod_autoindex.c

 mod_asis.c

 mod_cgi.c

 mod_negotiation.c

 mod_dir.c

 mod_actions.c

 mod_userdir.c

 mod_alias.c

 mod_so.c

In httpd.conf, i only have the following LoadModule Statement

=============================================================

LoadModule wsgi_module modules/mod_wsgi.so

Information about Global Accept Mutex

=====================================

Valid accept mutexes for this platform and MPM are: default, fcntl,

sysvsem, posixsem, pthread.

Alo, here is my build session transcript while building mod_wsgi.....There was absolutely no error during build.

root [zibal]% make

        /usr/local/apache2/bin/apxs -c -I/usr/local/include/python2.6 -DNDEBUG   mod_wsgi.c -L/usr/local/lib -L/usr/local/lib/python2.6/config  -lpython2.6 -ldl -lm

/usr/local/apache2/build/libtool --silent --mode=compile gcc -prefer-pic   -U__STR__ -D_THREAD_SAFE -D_USE_IRS -D_LARGEFILE64_SOURCE -g -O2 -pthread -I/usr/local/apache2/include  -I/usr/local/apache2/include   -I/usr/local/apache2/include -I/usr/local/include -I/usr/local/include/python2.6 -DNDEBUG  -c -o mod_wsgi.lo mod_wsgi.c && touch mod_wsgi.slo

/usr/local/apache2/build/libtool --silent --mode=link gcc -o mod_wsgi.la  -rpath /usr/local/apache2/modules -module -avoid-version  -Wl,-brtl  mod_wsgi.lo -L/usr/local/lib -L/usr/local/lib/python2.6/config -lpython2.6 -ldl -lm

Target "all" is up to date.

root [zibal]% make install

        /usr/local/apache2/bin/apxs -i -S LIBEXECDIR=/usr/local/apache2/modules -n 'mod_wsgi' mod_wsgi.la

/usr/local/apache2/build/instdso.sh SH_LIBTOOL='/usr/local/apache2/build/libtool' mod_wsgi.la /usr/local/apache2/modules

rm -f /usr/local/apache2/modules/mod_wsgi.so

/usr/local/apache2/build/libtool --mode=install cp mod_wsgi.la /usr/local/apache2/modules/

cp .libs/mod_wsgi.so /usr/local/apache2/modules/mod_wsgi.so

cp .libs/mod_wsgi.lai /usr/local/apache2/modules/mod_wsgi.la

cp .libs/mod_wsgi.a /usr/local/apache2/modules/mod_wsgi.a

chmod 644 /usr/local/apache2/modules/mod_wsgi.a

ranlib /usr/local/apache2/modules/mod_wsgi.a

----------------------------------------------------------------------

Libraries have been installed in:

   /usr/local/apache2/modules

If you ever happen to want to link against installed libraries

in a given directory, LIBDIR, you must either use libtool, and

specify the full pathname of the library, or use the `-LLIBDIR'

flag during linking and do at least one of the following:

   - add LIBDIR to the `LIBPATH' environment variable

     during execution

   - use the `-Wl,-blibpath:LIBDIR:/opt/freeware/lib/gcc/powerpc-ibm-aix5.3.0.0/4.2.4:/opt/freeware/lib/gcc/powerpc-ibm-aix5.3.0.0/4.2.4/../../..:/usr/lib:/lib ' linker flag

See any operating system documentation about shared libraries for

more information, such as the ld(1) and ld.so(8) manual pages.

----------------------------------------------------------------------

chmod 755 /usr/local/apache2/modules/mod_wsgi.so

Please let me know if I should provide some additional information.

Regards,

Anurag