[mod_python] Help about apache mod_python Segmentation fault

auther_bin auther_bin at 21cn.com
Mon Mar 3 21:11:39 EST 2008


Hi, Graham Dumpleton!

¡¡¡¡Thanks for your help first, but the problem is still there. here is my testing steps:

I read carefully of the URL you give me: http://code.google.com/p/modwsgi/wiki/InstallationIssues
and re-compiling the python2.5 --enable-shared, and get python libpython2.5.so install, when I testing python like:

=====================================================================
# python
Python 2.5 (r25:51908, Mar  4 2008, 08:56:31) 
[GCC 3.4.4] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> testi=1
>>> if testi==1:
...  print "hello test"
... 
hello test
>>> <ctl-d>
# ldd python
		libpython2.5.so.1.0 => not found
        libpthread.so.0 => /lib/libpthread.so.0 (0x40023000)
        libdl.so.0 => not found
        libutil.so.0 => not found
        libm.so.0 => not found
        libc.so.0 => not found
        libc.so.6 => /lib/libc.so.6 (0x40076000)
        /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
# ## for the libs is installed in an embeded path so some of them could not be found
# ls -F /bin/lib/python2.5/config
Makefile         config.c         libpython2.5.a   python.o
Setup            config.c.in      [email protected]
Setup.local      install-sh*      makesetup*
=====================================================================

when I run "httpd -X" it's still gives an Segmentation fault :(
anything else could be found about this crash?
or I give you an ssh login to my host :)

======= 2008-03-03 wrote =======

>In gdb, instead of 'where', try:
>
>  thread apply all bt
>
>in case gdb isn't throwing you into the correct thread context.
>
>BTW, does the Python on the environment that crashes provide a shared
>library? For what I am talking about see:
>
>  http://code.google.com/p/modwsgi/wiki/InstallationIssues
>
>This is documentation from mod_wsgi but same problems apply to mod_python.
>
>Graham
>
>On 03/03/2008, auther_bin <auther_bin at 21cn.com> wrote:
>>
>>
>> Hi Graham Dumpleton,
>>
>> And, when I debug in RedHat9 and my embeded
>> envirenment, the main process goes
>> different!?
>>
>> in Redhat9, run like:
>>
>>
>> (gdb) b main
>> Breakpoint 1 at 0x8067a40: file main.c, line 438.
>> (gdb) run -X
>> Starting program: /usr/local/apache2/bin/httpd -X
>> [New Thread 1076592288 (LWP 1049)]
>> [Switching to Thread 1076592288 (LWP 1049)]
>>
>> Breakpoint 1, main (argc=134642240, argv=0x2) at main.c:438
>> 438     {
>> (gdb) n
>> 272         stat = apr_app_initialize(argc, argv, NULL);
>>
>> and in my embeded system runs like:
>>
>>
>>
>> Breakpoint 1, main (argc=2, argv=0xbffff294)
>>     at
>> /usr/src/build/snapgear/user/apache/server/main.c:441
>> 441         int configtestonly = 0;
>> (gdb) n
>> 442         const char *confname = SERVER_CONFIG_FILE;
>>
>>
>>
>> it seems that, the hosting system doing something for init before the main
>> function run, but embeded system do not?
>>
>> I thinks is here somthing wrong? or there should be some compiling
>> parameters I missed?
>>
>> ======= 2008-02-27 wrote: =======
>>
>>
>> >On 27/02/2008, auther_bin  <auther_bin at 21cn.com > wrote:
>> > > Dear friends,
>> > >
>> > >         When I compiling the apache python mod_python
>> and install it into my uClibc
>> envirentment,
>> but when I
>> > >  runing httpd -X, send a very little request with
>> index.html it crashed. after some debuging work,
>> I find there should be something wrong in mod_python.c
>> line(about 1561) which looks like:
>> > >  --------------------------------- with my debug
>> printing :) ------------------------
>> > >  printf("JJJJJJJJ %s - > python_handler\n", phase);
>> > >  printf("JJJJJJJJ %x[%d]\n", &req- >per_dir_config,
>> (&python_module)- >module_index);
>> > >     /* get configuration */
>> > >     conf = (py_config *) ap_get_module_config(req-
>> >per_dir_config,
>> > >
>> &python_module);
>> > >  printf("JJJJJJJJ a %s conf=%x - > python_handler\n",
>> phase,conf);
>> > >  .............
>> > >  ------------------------------ end source
>> --------------------------------------
>> > >
>> > >  I guess that, there should be a regester error in
>> it. with some debug message I print:
>> > >  ------------- printing -------------------------------
>> > >  JJJJJJJJJ PythonPostReadRequestHandler
>> > >  JJJJJJJJ PythonInitHandler - > python_handler
>> > >  JJJJJJJJ 820a544[29]
>> > >  Segmentation fault
>> > >  ------------- end printing ---------------------------
>> > >
>> > >  any advices pls?
>> >
>> >Unfortunately that doesn't help much.
>> >
>> >You need a stack trace to show the true location
>> in code.
>> >
>> >Use procedure documented in section 'Debugging
>> Crashes With GDB' of:
>> >
>> >
>> http://code.google.com/p/modwsgi/wiki/DebuggingTechniques
>> >
>> >to run up httpd inside of gdb and get a stack trace
>> of where crash is occurring.
>> >
>> >This documentation is for mod_wgsi, but same procedure
>> used for mod_python.
>> >
>> >There is a similar procedure documented on Apache
>> site, but can't
>> >remember where.
>> >
>> >Graham
>> >
>> >
>> >__________ NOD32 2906 (20080227) Information
>> __________
>> >
>> >This message was checked by NOD32 antivirus system.
>> >http://www.nod32cn.com
>> >
>> >
>>
>> = = = = = = = = = = = = = = = = = = = =
>>
>>
>>                     ÖÂ
>> Àñ£¡
>> 2008-03-03
>>
>> _______________________________________________
>> Mod_python mailing list
>> Mod_python at modpython.org
>> http://mailman.modpython.org/mailman/listinfo/mod_python
>>
>>
>> __________ NOD32 2915 (20080303) Information __________
>>
>> This message was checked by NOD32 antivirus system.
>> http://www.nod32cn.com
>>
>>
>> _______________________________________________
>>  Mod_python mailing list
>>  Mod_python at modpython.org
>>  http://mailman.modpython.org/mailman/listinfo/mod_python
>>
>>

= = = = = = = = = = = = = = = = = = = =
			

                    ÖÂ
Àñ£¡
		2008-03-04 



More information about the Mod_python mailing list