|
Graham Dumpleton
graham.dumpleton at gmail.com
Tue Mar 9 17:16:16 EST 2010
A segmentation fault can occur for other reasons. If it is happening when you use LDAP, it could be a conflict in versions of LDAP libraries being used by Apache or PHP and Python LDAP module. You should use the 'ldd' command to determine what LDAP shared library is used by mod_authnz_ldap and compare that to the LDAP library being used by the C extension module component of the Python module you are using to access LDAP. Similarly find any PHP extension modules which use LDAP and look at those. If mod_authnz_ldap is loaded into Apache and you don't need it, then don't load it and see if problem goes away. Also try not loading PHP if it is being loaded. Narrow down which is in conflict. As far as I remember, Apache itself doesn't link to LDAP library and even possible that mod_authnz_ldap uses an internal LDAP library rather than linking external library. All the same even use ldd on Apache binary itself to see which LDAP library may be linked. Graham On 10 March 2010 04:18, wayne collier <Wayne.Collier at noaa.gov> wrote: > Okay I guess I will look else where. However, I keep getting segmentation > faults when try an execute the ldap command > > t=l.simple_bind_s(dn,pw). It is only line of code that crashes. If the have > the classic expat problem, would that mean I would get a segmentation > fault problem from the start. Also, ldap script works okay as a stand alone > script. Thanks. > > Wayne > > > Graham Dumpleton wrote: > > That is not your problem, quoting: > > http://code.google.com/p/modwsgi/wiki/IssuesWithExpatLibrary > > which is more up to date in respect of this issue, even if the > mod_wsgi variant of that document: > > """Note that this only applies to Python versions prior to Python 2.5. > >From Python 2.5 onwards, the copy of the "expat" library bundled in > with Python is name space prefixed, thereby avoid name clashes with an > "expat" library which has previously been loaded.""" > > You are using Python 2.6, so you cannot be affected by this problem. > > Graham > > On 9 March 2010 05:54, wayne collier <Wayne.Collier at noaa.gov> wrote: > > > Hello all. I need some help solving the dreaded segmentation fault that has > cropped several time on this board. I have read the link > http://www.dscpl.com.au/wiki/ModPython/Articles/ExpatCausingApacheCrash and > followed the step and have uncovered the following. > > > > > ldd /usr/local/httpd-2.2.11/bin/httpd | grep expat > > > libexpat.so.0 => /lib/libexpat.so.0 (0x00d70000) > > > > strings /lib/libexpat.so.0 | grep expat_ > > > expat_1.95.8 > > > > ps aux | grep http | head -3 > > > webuser 14986 0.0 2.1 54236 19048 ? S Mar04 0:01 > /usr/local/httpd-2.2.11/bin/httpd -d /usr/local/httpd-2.2.11 -f > /usr/local/httpd-2.2.11/conf/httpd.conf > webuser 14987 0.0 3.2 144128 29540 ? S Mar04 0:01 > /usr/local/httpd-2.2.11/bin/httpd -d /usr/local/httpd-2.2.11 -f > /usr/local/httpd-2.2.11/conf/httpd.conf > webuser 14998 0.0 3.2 144212 29660 ? S Mar04 0:01 > /usr/local/httpd-2.2.11/bin/httpd -d /usr/local/httpd-2.2.11 -f > /usr/local/httpd-2.2.11/conf/httpd.conf > > > > /usr/sbin/lsof -p 14986 | grep expat > > > httpd 14986 webuser mem REG 3,5 572313 972637 > /opt/Python/lib/python2.6/lib-dynload/pyexpat.so > httpd 14986 webuser mem REG 3,5 133120 1883791 > /lib/libexpat.so.0.5.0 > > I am not sure why I get 2 shared libaries here. > > > > strings /lib/libexpat.so.0.5.0 | grep expat_ > > > expat_1.95.8 > > > > > strings /opt/Python/lib/python2.6/lib-dynload/pyexpat.so | grep expat_ > > > pyexpat.expat_CAPI 1.0 > expat_CAPI > expat_2.0.0 > > > > > import pyexpat > pyexpat.version_info > > > (2, 0, 0) > > > So it seems like I need get expat_1.95.8 apache is using up to expat_2.0.0. > Can I simply try replacing the 1.95.8 library with 2.0.0. Or do I have > recompile with Apache? If I do recompile I need to recompile apache with > mod_python as well? > > > > > > > _______________________________________________ > Mod_python mailing list > Mod_python at modpython.org > http://mailman.modpython.org/mailman/listinfo/mod_python > > >
|