Logs show the segmentation faults I speak of:

[Wed Dec 08 11:32:47 2010] [error] [client 82.231.115.1] Premature end
of script headers: demo.wsgi, referer: http://example.com/employees/
[Wed Dec 08 11:32:47 2010] [notice] child pid 22620 exit signal
Segmentation fault (11)

Attach gdb to daemon process as described in:

http://code.google.com/p/modwsgi/wiki/DebuggingTechniques#Debugging_Crashes_With_GDB

enter 'cont' command so runs again and then keep firing off requests
until it crashes.

Suggest removing maximum-requests during that time so that process
isn't restarted because of that number being exceeded.

In other words, debug why process is crashing.

For ideas of why, see:

http://code.google.com/p/modwsgi/wiki/FrequentlyAskedQuestions#Apache_Process_Crashes
http://code.google.com/p/modwsgi/wiki/ApplicationIssues

Graham

On 8 December 2010 21:37, Stéphane Klein <[email protected]> wrote:
> Le 08/12/2010 11:21, Stéphane Klein a écrit :
>>
>> Le 08/12/2010 10:54, Graham Dumpleton a écrit :
>>>
>>> On 8 December 2010 20:37, Stéphane Klein<[email protected]> wrote:
>>>>
>>>> Hi,
>>>>
>>>> I use Pylons 1.0 Framework and mod_wsgi on production server.
>>>>
>>>> I can use my application but randomly 1 request on 10 I've error :
>>>>
>>>> "Internal Server Error" in browser and in error log file :
>>>>
>>>> [client 82.231.115.1] Premature end of script headers: demo.wsgi,
>>>> referer:
>>>> http://example.com/
>>>
>>> Need to see the error messages before and after this and for matching
>>> time in main Apache error log if you are using a virtual host specific
>>> error log.
>>>
>>> This message will arise in a few circumstances.
>>>
>>
>> This is more information messages :
>>
>> http://pastebin.com/myi5D5Xn
>
> Well, I see the last message of this thread :
> http://groups.google.com/group/modwsgi/browse_thread/thread/ba82b2643564d2dd
>
> He say :
>
> """Last night we installed mod_wsgi 3.3, and the KeyErrors have totally
> disappeared.  I highly recommend the 3.3 upgrade if you're having this
> problem.  Thanks, Graham."""
>
> In my test, I've tested mod_wsgi 3.3 and 2.8
> In last log message, it's 2.8 version.
>
> Now I've reinstalled 3.3 version, this is the new log messages :
>
> http://pastebin.com/kKztWiCY
>
> Regards,
> Stephane
> --
> Stéphane Klein <[email protected]> - French
> blog: http://stephane-klein.info
> twitter: http://twitter.com/klein_stephane
> pro: http://www.is-webdesign.com
>

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