[Mediawiki-l] MediaWiki partially stopped working (Update)

[Platonides]

Agon S. Buchholz wrote:
> Tim Starling wrote:
> 
>> It sounds like you're running a threaded MPM and PHP is segfaulting. 
>> To avoid having MediaWiki interfere with other apps, use the prefork 
>> MPM whenever you are using PHP. This is strongly recommended by the 
>> PHP manual.
> 
> I'm running Apache2 as Prefork MPM [1]; in Debian, that is done
> automagically when installing PHP. At least it is supposed to do so
> according to the documentation and to my package database.
> 
>> I believe I have written a post or two in the past about debugging 
>> and fixing segfaults. I'll repeat some basic principles here in 
>> brief.
> 
> Is there any way to determine, if httpd (or whatever) really *is*
> segfaulting?

run it on a debugger (likely gdb). It will catch teh segfault and tell 
you where the segfault is.

> At least in "mytop" I can see that sql statements seem to be processed;
> somehow they have to get there.
> 
> If I enter a nonexisting article name in the search box, in "mytop"
> something like this appears:
> 
>    Query SELECT page_id, page_namespace, page_title FROM
>    `page`,`searchindex` WHERE page_id=si_page AND
>    [...]
> 
> The rest of the sql statement i can not read (it doesn't do line
> breaks). However, this appears like the beginning of an valid statement,
> even if it simply stays there "forever".

Read it in the page source.