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Philippe C. Martin
pmartin at snakecard.com
Tue Oct 18 21:45:43 EDT 2005
Got it I think: you mean more than one library are on my disk ? If so, that's the only I found in the LIB path: /usr/lib/libexpat.so.0.5.0. So that would mean that apache and python use the same right ? I'll do some google to see if it is an old one. Regards, Philippe On Wednesday 19 October 2005 01:33 am, Graham Dumpleton wrote: > Philippe C. Martin wrote .. > > > Hi, > > > > I'm not sure that's enough info: > > > > Just for my knowledge, why would that have an effect in apache and not > > the > > command line ? > > Imagine if each version of expat used a slightly different structure > layout or structure size for something. An object created in the code of > the shared library when accessed by C code compiled against the library, > but that of a different version, could access the wrong bit of the > object and thus follow a bogus pointer and thus crash. > > Consider this platform I have access to: > > cinderella$ python > Python 2.3.4 (#1, Nov 25 2004, 17:05:37) > [GCC 3.3.2] on sunos5 > Type "help", "copyright", "credits" or "license" for more information. > > >>> import pyexpat > >>> pyexpat.version_info > > (1, 95, 7) > > >>> ^D > > cinderella$ cd /usr/local/lib > cinderella$ strings libexpat.so | grep expat_ > expat_1.95.4 > > The libexpat.so installed on the system has an older version than that > compiled into Python. If something causes the libexpat.so to be linked > into Apache at the same time as the Python code executing from > mod_python is using the embedded one, if there is an incompatability, > there may be a problem. > > In this case, I should be looking at upgrading the one installed in the > operating system. > > Depending on your system the libexpat.so might be in /lib, /usr/lib, > /usr/local/lib or elsewhere. > > Graham > > > [philippe at pcmsc philippe]$ python > > Python 2.4.2 (#1, Oct 18 2005, 04:32:14) > > [GCC 3.4.1 (Mandrakelinux 10.1 3.4.1-4mdk)] on linux2 > > Type "help", "copyright", "credits" or "license" for more information. > > > > >>> import pyexpat > > >>> pyexpat.version_info > > > > (1, 95, 8) > > > > >>> import expat > > > > Traceback (most recent call last): > > File "<stdin>", line 1, in ? > > ImportError: No module named expat > > > > > > > > [philippe at pcmsc SC]$ find /usr/lib/python2.4/ -name '*expat*' -exec ls > > -l {} > > \; > > -rw-r--r-- 1 root root 2586 Oct 18 > > 04:35 /usr/lib/python2.4/test/output/test_pyexpat > > -rw-r--r-- 1 root root 12012 Oct 18 > > 04:35 /usr/lib/python2.4/test/test_pyexpat.py > > -rw-r--r-- 1 root root 11514 Oct 18 > > 04:36 /usr/lib/python2.4/test/test_pyexpat.pyc > > -rw-r--r-- 1 root root 11514 Oct 18 > > 04:36 /usr/lib/python2.4/test/test_pyexpat.pyo > > -rw-r--r-- 1 root root 36379 Oct 18 > > 04:35 /usr/lib/python2.4/xml/dom/expatbuilder.py > > -rw-r--r-- 1 root root 31084 Oct 18 > > 04:36 /usr/lib/python2.4/xml/dom/expatbuilder.pyc > > -rw-r--r-- 1 root root 30453 Oct 18 > > 04:36 /usr/lib/python2.4/xml/dom/expatbuilder.pyo > > -rw-r--r-- 1 root root 112 Oct 18 > > 04:35 /usr/lib/python2.4/xml/parsers/expat.py > > -rw-r--r-- 1 root root 273 Oct 18 > > 04:36 /usr/lib/python2.4/xml/parsers/expat.pyc > > -rw-r--r-- 1 root root 273 Oct 18 > > 04:36 /usr/lib/python2.4/xml/parsers/expat.pyo > > -rw-r--r-- 1 root root 14408 Oct 18 > > 04:35 /usr/lib/python2.4/xml/sax/expatreader.py > > -rw-r--r-- 1 root root 13471 Oct 18 > > 04:36 /usr/lib/python2.4/xml/sax/expatreader.pyc > > -rw-r--r-- 1 root root 13471 Oct 18 > > 04:36 /usr/lib/python2.4/xml/sax/expatreader.pyo > > -rwxr-xr-x 1 root root 436290 Oct 18 > > 04:33 /usr/lib/python2.4/lib-dynload/pyexpat.so > > > > On Wednesday 19 October 2005 12:35 am, Graham Dumpleton wrote: > > > Philippe C. Martin wrote .. > > > > > > > Hi, > > > > > > > > If any of you wish to look at this: this code works in command line, > > > > and > > > > > > crashes with apache. Something I'm doing is really anoying minidom. > > > > > > > > > > > > you can fetch the xml file responsible at: > > > > www.snakecard.com/mod_python > > > > > > > > Any help is greatly appreciated. > > > > > > I you are using a module which does XML processing and it is literally > > > crashing, look at what version of the expat libraries that are > > > installed on your system. > > > > > > A problem that can occur is that Python embeds a version of expat > > > within its pyexpat module. If an incompatible version of expat is also > > > linked in as a shared library, a crash generally occurs. > > > > > > To determine the version of expat embedded in Python, do from a command > > > > > > line run Python: > > > >>> import pyexpat > > > >>> pyexpat.version_info > > > > > > (1, 95, 6) > > > > > > Ensure that the version of any expat shared library is at least newer > > > than that embedded into Python, or the same version if possible. > > > > > > Graham > > > > -- > > ************************************* > > Philippe C. Martin > > SnakeCard, LLC > > www.snakecard.com > > +1 405 694 8098 > > ************************************* -- ************************************* Philippe C. Martin SnakeCard, LLC www.snakecard.com +1 405 694 8098 *************************************
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