[mod_python] mod_python with xmlrplib

Didn't Python 2.4 include a newer version of the expat library?
*checks*
Indeed, the post is here: 
http://mail.python.org/pipermail/xml-sig/2004-August/010405.html
The library mismatch could be the problem, as described in the thread in 
the link:
http://mail.python.org/pipermail/python-list/2004-December/256676.html

Regards,
Indrek

Mark McClain wrote:

> This is probably has something do to with the library conflicts.  Our 
> production servers (mod_python 3.1.x, apache 2.0.x, python 2.3.x) has 
> been using xmlrpclib for over a year without any crashes.
>
> Have you compiled your own versions of apache,mod_python, and python?  
> Or are you using the stock redhat versions?
>
> Mark
>
> On Jan 26, 2005, at 11:47 PM, David Fraser wrote:
>
>> Graham Dumpleton wrote:
>>
>>> Marco Catunda wrote ..
>>>
>>>> I haven't been able to use xmlrpclib with mod_python.
>>>> When I import xmlrpclib the apache server crash (segmentation fault),
>>>> the following code will be show it.
>>>>
>>>> =====================================
>>>> from mod_python import apache
>>>> import xmlrpclib
>>>>
>>>> def handler( req ):
>>>>         req.write("Hello World!")
>>>>         return apache.OK
>>>> =====================================
>>>>
>>>> My system:
>>>>   RedHat ES 3
>>>>   Apache 2.0.52
>>>>   Python 2.4
>>>>
>>>> Is there a way to fix it?
>>>>
>>>
>>> The xmlrpclib module uses a Python XML module which looks like it tries
>>> to use expat.
>>>
>>>
>>>>>> import xmlrpclib
>>>>>> import sys
>>>>>> sys.modules.keys()
>>>>>>
>>> ['cStringIO', 'copy_reg', 'sre_compile', '_sre', 'site', 
>>> '__builtin__', 'xml.parsers.expat', 'xml._xmlplus', 'xml.parsers', 
>>> 'xml.sys', '__main__', 'operator', 'xml.parsers.pyexpat', 'xml', 
>>> 'posixpath', 'base64', 'binascii', 'pyexpat.errors', 
>>> 'sre_constants', 're', 'os.path', 'stat', 'zipimport', 'string', 
>>> 'warnings', 'UserDict', '_xmlplus', 'sys', 'readline', 'types', 
>>> 'strop', 'sre', 'signal', 'xmlrpclib', 'linecache', 'posix', 
>>> 'pyexpat.model', 'time', 'exceptions', 'sre_parse', 'os']
>>>
>>> It is a frequent problem that the version of the expat shared 
>>> library which
>>> is used by the Python modules differs to that which Apache or PHP may
>>> already be using. This difference can result in a server crash.
>>>
>>> You should thus try to determine if you have multiple versions of expat
>>> present and whether these different packages are using different 
>>> versions.
>>>
>>> On Linux, you might be able to use "ldd" to work this out by running it
>>> on the "httpd" binary, as well as the appropriate .so Python module.
>>>
>>>  ldd /somepath-to-apache-bin-dir/httpd
>>>  ldd /somepath-to-python-module-dir/lib-dynload/pyexpat.so
>>>  ldd /somepath-to-apache-module-dir/*php*.so
>>>
>>> The paths will need to be adjusted obviously.
>>>
>>> Please post the results of ldd if you can as am curious to see if this
>>> does help, I have never suggested trying it before.
>>>
>>> Graham
>>>
>>>
>> Since this is a common problem, I wonder if there may be a way to put 
>> checks into the Python modules that use expat to prevent this happening?
>>
>> David
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>
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