[bdbxml] Re: [mod_python] Segmentation fault with mod_python and DBXML

On Mon, 2005-08-22 at 15:29 +0530, Manjeet Chaudhary wrote:
> Hello Conrad
> 
> In my case the culprit was Berkley DB. I checked the Libraries for 
> "httpd" , "python" and "dbxml".
> I replaced the "libdb-4.2.so"  at "/lib/tls/i686/libdb-4.2.so"  by 
> "libdb-4.3.so" installed by DBXML-2.1.8 in "/usr/local/lib".
> But i think this is not a good solution.

Yes, you're right :-) Rather keep the system version of libdb-4.2.so and
recompile dbxml to use that version - just copying a newer library over
an older one is likely to give you a lot of trouble.

> I need a proper installation and configuration process.
> I am using CentOS-4.x. For my requirement i use following installation 
> process after OS installation:
> 
> 1.    Install DBXML-2.1.8 with default installation.
> 2.    Copy the Libraries "/usr/local/lib/*" to /usr/lib/
> 3.    Install pybsddb
> 4.    Install DBXML module for Python.

I Would say, rather do
1. Install DBXML from source so that it gets linked to the system
version of libdb.
2. Ditto pybsddb
3. Ditto DBXML module for Python.

Cheers

Conrad

> 
> As Berkeley DB get installed with Python and installing DBXML result in 
> some Version conflict. What should i do to avoid this conflict.
> Should i install individual packages from dbxml-2.1.8 (except DB) to 
> avoid conflict.
>  
> Manjeet Ch
> 
> Conrad Steenberg wrote:
> 
> >Hi Manjeet
> >
> >You must use exactly the same libraries in Python and Apache for your
> >application to work. Apart from expat that was already pointed out, a
> >common culprit is also Berkeley DB, because it's used very widely.
> >
> >Do an 'ldd /usr/sbin/httpd', or whatever your Apache executable is, to
> >find out what libraries it's linked to. Then do the same for your Python
> >binary, and maybe the dbxml Python module as well.
> >
> >Cheers
> >
> >Conrad
> >
> >On Tue, 2005-08-16 at 13:14 +0200, Julien wrote:
> >  
> >
> >>Maybe a library has problem with threads ... 
> >>try running apache in prefork mode (in place of threads) to see if it
> >>resolve the problem ...
> >>
> >>On Tue, 2005-08-16 at 15:54 +0530, Manjeet Chaudhary wrote:
> >>    
> >>
> >>>Hello All,
> >>>
> >>>Sorry if the mail got duplicated.
> >>>I am developing a web based application; based on Apache, mod_python, 
> >>>dbxml and python programming; When i try to import dbxml module( to 
> >>>perform various dbxml operations ) from mod-python handler and give a 
> >>>url request to mod-python handler i am getting an error of Segmentation 
> >>>Fault in apache error log .
> >>>I am using following versions of software
> >>>1) dbxml -  2.1.8
> >>>2) python - 2.3.4
> >>>3) mod-python - 1.3.4
> >>>4) apache 2.0.52
> >>>5) Kernel version-2.6.9-5.0.5-EL
> >>>
> >>>I think the error occurs at the time when i am creating the XmlManager 
> >>>instance in dbxml module.
> >>>I am using Publisher Handler of mod-python.
> >>>
> >>>Apache error log (/var/log/httpd/error_log)
> >>>
> >>>[Tue Aug 16 10:17:43 2005] [notice] mod_python: (Re)importing module 
> >>>'mod_python.publisher'
> >>>[Tue Aug 16 10:17:43 2005] [notice] mod_python: (Re)importing module 'x' 
> >>>with path set to '['/var/www/cgi-bin/sw']'
> >>>[Tue Aug 16 10:17:44 2005] [notice] child pid 3238 exit signal 
> >>>Segmentation fault (11)
> >>>
> >>>Please let me know is there any solution to this problem .
> >>>It is very urgent.
> >>>Thanks in advance.
> >>>Regards,
> >>>
> >>>Manjeet Chaudhary
> >>>_______________________________________________
> >>>Mod_python mailing list
> >>>[email protected]
> >>>http://mailman.modpython.org/mailman/listinfo/mod_python
> >>>
> >>>      
> >>>
-- 
Conrad Steenberg <[email protected]>
California Institute of technology