[mod_python] wrong version?

Kyle Simpson kyle.simpson at gmail.com
Tue Apr 8 22:30:04 EDT 2008


Yes there are header files in /usr/local/apache28/include

Value is: #define MODULE_MAGIC_COOKIE 0x41503232UL /* "AP22" */

In older version, it is:
#define MODULE_MAGIC_COOKIE 0x41503232UL /* "AP22" */

How do you determine the -l flags when the compiler is run?

Thanks.

On Tue, Apr 8, 2008 at 8:28 PM, Graham Dumpleton <graham.dumpleton at gmail.com>
wrote:

> 2008/4/9 Kyle Simpson <kyle.simpson at gmail.com>:
> > Any other ideas on this topic?
>
> As I said before, the problem is that you are managing to either
> install mod_python.so into the wrong installation or you have compiled
> it against the header files for the wrong version of Apache.
>
> The proof of this is that the magic number your mod_python.so has equates
> to:
>
>  #define MODULE_MAGIC_COOKIE 0x41503230UL /* "AP20" */
>
> whereas Apache is expecting:
>
>  #define MODULE_MAGIC_COOKIE 0x41503232UL /* "AP22" */
>
> Do you have header files installed in the following directory?
>
>  /usr/local/apache28/include
>
> Are those header files readable to the user that you are compiling
> mod_python?
>
> Look in the header file 'ap_mmn.h' in that directory, what is the
> value of MODULE_MAGIC_COOKIE?
>
> Now go find where the header files for your other Apache installation
> are located and find what its value of MODULE_MAGIC_COOKIE is? What
> directory are those header files in?
>
> To work out why it is picking up wrong header files, as I suggested
> before, look at the -I flags used when compiler is run on mod_python
> source code. For example on my system I get:
>
> /usr/local/apache-2.2.4/bin/apxs
> -I/Users/grahamd/Projects/mod_python-trunk/src/include
>
> -I/System/Library/Frameworks/Python.framework/Versions/2.3/include/python2.3
> -DNDEBUG -Wc,'-arch ppc' -c mod_python.c _apachemodule.c
> requestobject.c tableobject.c util.c serverobject.c connobject.c
> filterobject.c hlist.c hlistobject.c finfoobject.c -arch ppc
> -Wl,-F/System/Library/Frameworks -framework Python -u __dummy -u
> _PyMac_Error -framework System  -framework CoreServices -framework
> Foundation -ldl
>
> What do you get?
>
> Graham
>
> > httpd: Syntax error on line 55 of /usr/local/apache28/conf/httpd.conf:
> API
> > module structure 'python_module' in file
> > /usr/local/apache28/modules/mod_python.so is garbled - expected
> signature
> > 41503232 but saw 41503230 - perhaps this is not an Apache module DSO, or
> was
> > compiled for a different Apache version?
> >
> > running on 2.6.9-023stab044.11-smp
> >
> > apache 2.2.8 (second install, which was in /usr/local/apache28
> >
> > python 2.5.2
> >
> >
> > Thanks,
> > Kyle
> >
> >
> >
> > On Tue, Apr 8, 2008 at 7:19 AM, Kyle Simpson <kyle.simpson at gmail.com>
> wrote:
> >
> > > 2 versions of apache
> > >
> > > just ./configure --with-apxs=/usr/local/apache28/bin/apxs
> > >
> > > I did make install
> > >
> > > And no, I don't understand the shared library issue.  Unfortunately
> I'm
> > pretty much a noob, since any previous apache haven't required any
> modules.
> > >
> > > Thanks for all the help.  Let me know if you have any other ideas.
> > >
> > >
> > >
> > >
> > >
> > > On Tue, Apr 8, 2008 at 1:49 AM, Graham Dumpleton
> > <graham.dumpleton at gmail.com> wrote:
> > >
> > > > What about my other questions:
> > > >
> > > >
> > > > How many different versions of Apache do you have installed?
> > > >
> > > > What options did you use to 'configure' when building mod_python?
> > > >
> > > > Did you use the 'install' target to 'make' or copy it by hand?
> > > >
> > > > Do you also understand what I am talking about with the shared
> library
> > > > issue, not that it in itself should cause this problem.
> > > >
> > > >
> > > >
> > > >
> > > > Graham
> > > >
> > > > 2008/4/8 Kyle Simpson <kyle.simpson at gmail.com>:
> > > > > After doing that, new error:
> > > > >
> > > > > httpd: Syntax error on line 55 of
> /usr/local/apache28/conf/httpd.conf:
> > API
> > > > > module structure 'python_module' in file /usr/loc?
> > > > >
> > > > > line 55 is:
> > > > > 55 LoadModule python_module modules/mod_python.so
> > > > >
> > > > > I did reconfigure/compile to see if that helped, but here's the ls
> -la
> > > > >
> > > > > 2857 -rwxr-xr-x    1 root     root      2911798 Apr  8 01:35
> > mod_python.so
> > > > >
> > > > > file
> > > > >
> > > > > /usr/local/apache28/modules/mod_python.so: ELF 32-bit LSB shared
> > object,
> > > > > Intel 80386, version 1 (SYSV), not stripped
> > > > >
> > > > > ldd
> > > > > libpthread.so.0 => /lib/libpthread.so.0 (0x00111000)
> > > > >         libdl.so.2 => /lib/libdl.so.2 (0x00826000)
> > > > >         libutil.so.1 => /lib/libutil.so.1 (0x00162000)
> > > > >         libm.so.6 => /lib/libm.so.6 (0x00ee8000)
> > > > >          libc.so.6 => /lib/libc.so.6 (0x00832000)
> > > > >         /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x00411000)
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > On Tue, Apr 8, 2008 at 12:52 AM, Graham Dumpleton
> > > > > <graham.dumpleton at gmail.com> wrote:
> > > > >
> > > > > > Did you do a full stop and start of Apache, not just a
> > restart/reload?
> > > > > >
> > > > > >
> > > > > > 2008/4/8 Kyle Simpson <kyle.simpson at gmail.com>:
> > > > > >
> > > > > > > 2857 -rwxr-xr-x    1 root     root      2911798 Apr  7 23:14
> > > > > > > /usr/local/apache28/modules/mod_python.so
> > > > > > >
> > > > > > > /usr/local/apache28/modules/mod_python.so: ELF 32-bit LSB
> shared
> > object,
> > > > > > > Intel 80386, version 1 (SYSV), not stripped
> > > > > > >
> > > > > > >  libpthread.so.0 => /lib/libpthread.so.0 (0xb7e54000)
> > > > > > >         libdl.so.2 => /lib/libdl.so.2 (0xb7e50000)
> > > > > > >         libutil.so.1 => /lib/libutil.so.1 (0xb7e4d000)
> > > > > > >         libm.so.6 => /lib/libm.so.6 (0xb7e2c000)
> > > > > > >          libc.so.6 => /lib/libc.so.6 (0xb7d09000)
> > > > > > >         /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0xb7fee000)
> > > > > >
> > > > > > This all indicates that your Python has not been installed with
> a
> > > > > > shared library and that Python is being linked statically into
> > > > > > mod_python.so. This is generally not a good as it bloats your
> Apache
> > > > > > processes by a couple of MB in size. It can also cause issues,
> > > > > > especially when upgrading from older to newer mod_python and/or
> > > > > > different version of Python. Thus why it is important to do a
> full
> > > > > > stop of Apache when replacing mod_python.so in this case.
> > > > > >
> > > > > > For details of Python shared library issues, see:
> > > > > >
> > > > > >  http://code.google.com/p/modwsgi/wiki/InstallationIssues
> > > > > >
> > > > > > This is from mod_wsgi documentation, but same issues apply.
> > > > > >
> > > > > > BTW, one more possibility is if you have multiple versions of
> Apache
> > > > > > installed when mod_python was compiled it used the wrong header
> > files.
> > > > > > How did you install mod_python.so.
> > > > > >
> > > > > > How many different versions of Apache do you have installed?
> > > > > >
> > > > > > What options did you use to 'configure' when building
> mod_python?
> > > > > >
> > > > > > Did you use the 'install' target to 'make' or copy it by hand?
> > > > > >
> > > > > > If copied by hand, maybe it was compiled against wrong version
> of
> > > > > > Apache for which you copied it into. You may want tp pay very
> > careful
> > > > > > attention to the -I flags to compiler when mod_python was
> compiled.
> > > > > >
> > > > > > Graham
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > > On Tue, Apr 8, 2008 at 12:30 AM, Graham Dumpleton
> > > > > > > <graham.dumpleton at gmail.com> wrote:
> > > > > > >
> > > > > > > > What do you get when you run:
> > > > > > > >
> > > > > > > >  ls -las /usr/local/apache28/modules/mod_python.so
> > > > > > > >
> > > > > > > > and:
> > > > > > > >
> > > > > > > >
> > > > > > > >  file /usr/local/apache28/modules/mod_python.so
> > > > > > > >
> > > > > > > > and:
> > > > > > > >
> > > > > > > >  ldd /usr/local/apache28/modules/mod_python.so
> > > > > > > >
> > > > > > > > Graham
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > 2008/4/8 Kyle Simpson <kyle.simpson at gmail.com>:
> > > > > > > > > Hi Graham,
> > > > > > > > >
> > > > > > > > > Thanks for the quick reply.
> > > > > > > > >
> > > > > > > > > I compiled all 3: python,apache,mod python.  Did not use
> > binaries
> > > > > for
> > > > > > > any of
> > > > > > > > > them.
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > On Tue, Apr 8, 2008 at 12:22 AM, Graham Dumpleton
> > > > > > > > > <graham.dumpleton at gmail.com> wrote:
> > > > > > > > >
> > > > > > > > > > 2008/4/8 Kyle Simpson <kyle.simpson at gmail.com>:
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > > Not sure what to make of this error.  I have apache
> 2.2.8,
> > > > > python
> > > > > > > 2.5.2
> > > > > > > > > and
> > > > > > > > > > > mod python 3.3.1.
> > > > > > > > > > >
> > > > > > > > > > > Any ideas?
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > httpd: Syntax error on line 54 of
> > > > > > > /usr/local/apache28/conf/httpd.conf:
> > > > > > > > > API
> > > > > > > > > > > module structure 'python_module' in file
> > > > > > > > > > > /usr/local/apache28/modules/mod_python.so is garbled -
> > expected
> > > > > > > > > signature
> > > > > > > > > > > 41503232 but saw 41503230 - perhaps this is not an
> Apache
> > module
> > > > > > > DSO, or
> > > > > > > > > was
> > > > > > > > > > > compiled for a different Apache version?
> > > > > > > > > >
> > > > > > > > > > Exactly what it means.
> > > > > > > > > >
> > > > > > > > > > Did you compile mod_python yourself for that version of
> > Apache or
> > > > > did
> > > > > > > > > > you just install a binary package from somewhere for
> both?
> > > > > > > > > >
> > > > > > > > > > I am assuming Apache has a concept of an internal ABI
> > number. This
> > > > > is
> > > > > > > > > > changed whenever the ABI is changed. You may not be able
> to
> > use a
> > > > > > > > > > precompiled module from an older version of Apache even
> if
> > same
> > > > > > > > > > major/minor version, if this ABI has changed.
> > > > > > > > > >
> > > > > > > > > > Graham
> > > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > >
> > > > > > >
> > > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> > >
> > >
> >
> >
>
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