It might help if you said which page and which wiki this happened on.

palapa: Looking up the stacktrace for 1ff8d8cb is very very welcome.

mirzaha wrote:

(In reply to comment #2)

palapa: Looking up the stacktrace for 1ff8d8cb is very very welcome.

I am not skilled enough to Looking up the stacktrace.

This happened on a WMF wiki, Andre. A WMF shell user must get the stack trace.

I think this might be a direct dupe, but it's certainly a dupe of the LinkCache fail bug

2012-10-24 19:44:46 mw19 bswiki: [1ff8d8cb] /wiki/Posebno:NedavneIzmjene Exception from line 2956 of /usr/local/apache/common-local/php-1.21wmf2/includes/Title.php: LinkCache doesn't currently know about this title: Aldin_Å etkiÄ
#0 /usr/local/apache/common-local/php-1.21wmf2/includes/Linker.php(143): Title->getLength()
#1 /usr/local/apache/common-local/php-1.21wmf2/includes/Linker.php(341): Linker::getLinkColour(Object(Title), 50)
#2 /usr/local/apache/common-local/php-1.21wmf2/includes/Linker.php(248): Linker::linkAttribs(Object(Title), Array, Array)
#3 /usr/local/apache/common-local/php-1.21wmf2/extensions/FlaggedRevs/frontend/FlaggedRevsUI.hooks.php(543): Linker::link(Object(Title), 'izmjene na ??ek...', Array, A$
#4 [internal function]: FlaggedRevsUIHooks::addToChangeListLine(Object(EnhancedChangesList), '<span class="mw...', '<table class="m...', Object(RCCacheEntry), false, f$
#5 /usr/local/apache/common-local/php-1.21wmf2/includes/Hooks.php(253): call_user_func_array('FlaggedRevsUIHo...', Array)
#6 /usr/local/apache/common-local/php-1.21wmf2/includes/GlobalFunctions.php(3811): Hooks::run('ChangesListInse...', Array)
#7 /usr/local/apache/common-local/php-1.21wmf2/includes/ChangesList.php(381): wfRunHooks('ChangesListInse...', Array)
#8 /usr/local/apache/common-local/php-1.21wmf2/includes/ChangesList.php(940): ChangesList->insertArticleLink('<table class="m...', Object(RCCacheEntry), false, false)
#9 /usr/local/apache/common-local/php-1.21wmf2/includes/ChangesList.php(1253): EnhancedChangesList->recentChangesBlockGroup(Array)
#10 /usr/local/apache/common-local/php-1.21wmf2/includes/ChangesList.php(1268): EnhancedChangesList->recentChangesBlock()
#11 /usr/local/apache/common-local/php-1.21wmf2/includes/specials/SpecialRecentchanges.php(531): EnhancedChangesList->endRecentChangesList()
#12 /usr/local/apache/common-local/php-1.21wmf2/includes/specials/SpecialRecentchanges.php(179): SpecialRecentChanges->webOutput(Object(ResultWrapper), Object(FormOpti$
#13 /usr/local/apache/common-local/php-1.21wmf2/includes/SpecialPage.php(599): SpecialRecentChanges->execute(NULL)
#14 /usr/local/apache/common-local/php-1.21wmf2/includes/SpecialPageFactory.php(497): SpecialPage->run(NULL)
#15 /usr/local/apache/common-local/php-1.21wmf2/includes/Wiki.php(291): SpecialPageFactory::executePath(Object(Title), Object(RequestContext))
#16 /usr/local/apache/common-local/php-1.21wmf2/includes/Wiki.php(554): MediaWiki->performRequest()
#17 /usr/local/apache/common-local/php-1.21wmf2/includes/Wiki.php(447): MediaWiki->main()
#18 /usr/local/apache/common-local/php-1.21wmf2/index.php(59): MediaWiki->run()

(In reply to comment #5)

I think this might be a direct dupe

Same trace as in bug 41258 comment 10.

I have experienced a few MWExceptions myself, the last one a while ago, trying to look on a history page on cswiki:

[7cbf546c] 2012-11-20 09:19:15: Fatal exception of type MWException

A page reload clears the problem and everything works correctly.

Just experienced too: Internal error
[59fad019] 2012-12-13 23:55:44: Fatal exception of type MWException, while previewing a change on [[m:Grants:Index]]. The change was:

from

[[File:WMCON2011_The_New_Wikimedia_Grants_Program.pdf|right|

to

[[:File:WMCON2011_The_New_Wikimedia_Grants_Program.pdf|right|

(i.e. added colon prefix to link)

Error message occurs also at user login and direct call of pages. See for instance:

http://de.wikivoyage.org/wiki/Rhodos

It is working correctly with a redirect like http://de.wikivoyage.org/wiki/Rhodes . After an edit the same error occur. But the edit was done.

(In reply to comment #10)

It is working correctly with a redirect like
http://de.wikivoyage.org/wiki/Rhodes . After an edit the same error occur.
But the edit was done.

Seems OK now. Is this still happening?

Yes, this still happens. Come over to my desk and I'll show you. It's one specific POST payload I've been re-submitting for two months now. I have already said it may well be that whatever was causing the bug was fixed, but my POST payload is still the same and may be poisoned by whatever was causing the exception in the first place.

That said, Mediawiki probablys shouldn't choke like that no matter _what_ the POST contains...

• This bug has been marked as a duplicate of bug 37209 ***