https://bugzilla.wikimedia.org/show_bug.cgi?id=20041
Summary: RSS/ATOM Feeds / Endless Loop in
includes/diff/DifferenceEngine.php(1258) : Fatal error -
Maximum execution time of 30 seconds exceeded
Product: MediaWiki
Version: 1.15.1
Platform: All
URL: http://wiki.rhein-
neckar.de/index.php?title=Spezial:Letzte_Änderungen&fee
d=rss
OS/Version: All
Status: NEW
Severity: major
Priority: Normal
Component: Special pages
AssignedTo: [email protected]
ReportedBy: [email protected]
Every request to our RSS/ATOM fires one apache child to 100% CPU for 30 seconds
before PHP's maximum execution time of 30sec kills
includes/diff/DifferenceEngine.php
Our error.log shows hundreds of lines (read: hundreds of minutes) every day
like
includes/diff/DifferenceEngine.php(1257) : Fatal error - Maximum execution time
of 30 seconds exceeded
includes/diff/DifferenceEngine.php(1257) : Fatal error - Maximum execution time
of 30 seconds exceeded
includes/diff/DifferenceEngine.php(1264) : Fatal error - Maximum execution time
of 30 seconds exceeded
includes/diff/DifferenceEngine.php(1248) : Fatal error - Maximum execution time
of 30 seconds exceeded
includes/diff/DifferenceEngine.php(1261) : Fatal error - Maximum execution time
of 30 seconds exceeded
includes/diff/DifferenceEngine.php(1258) : Fatal error - Maximum execution time
of 30 seconds exceeded
includes/diff/DifferenceEngine.php(1258) : Fatal error - Maximum execution time
of 30 seconds exceeded
includes/diff/DifferenceEngine.php(1257) : Fatal error - Maximum execution time
of 30 seconds exceeded
includes/diff/DifferenceEngine.php(1261) : Fatal error - Maximum execution time
of 30 seconds exceeded
includes/diff/DifferenceEngine.php(1256) : Fatal error - Maximum execution time
of 30 seconds exceeded
includes/diff/DifferenceEngine.php(1257) : Fatal error - Maximum execution time
of 30 seconds exceeded
includes/diff/DifferenceEngine.php(1257) : Fatal error - Maximum execution time
of 30 seconds exceeded
The lines differ from about 1248 to 1264 with a stress on 1257.
You may reproduce this by using wget for example:
-----------------
$ time wget --no-proxy -O /dev/null
"http://wiki.rhein-neckar.de/index.php?title=Spezial:Letzte_Änderungen&feed=rss";
--2009-08-02 19:10:22--
http://wiki.rhein-neckar.de/index.php?title=Spezial:Letzte_%C4nderungen&feed=rss
Resolving wiki.rhein-neckar.de... 62.138.134.203
Connecting to wiki.rhein-neckar.de|62.138.134.203|:80... connected.
HTTP request sent, awaiting response... 500 Internal Server Error
2009-08-02 19:10:52 ERROR 500: Internal Server Error.
real 0m30.127s
user 0m0.000s
sys 0m0.006s
-----------------
The server's CPU is a "Dual Core AMD Athlon(tm) 64 X2 Dual Core Processor
4200+" which should be more than adequate for a single instance mediawiki.
I expect we had this problem before 1.13, we had it for 1.14.0 and now with
1.15.1.
Please check http://wiki.rhein-neckar.de/index.php/Spezial:Version for
installed extensions on our wiki.
If you need more detailed informationen (configuration), please ask!
If you want me to apply patches for testing/profiling/debugging, ... please
ask!
If you expect inconsistent data in out database, please send me some
checkscripts.
TIA
Raphael Becker
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