Last modified: 2014-06-24 17:51:55 UTC
From mediawiki-l: http://thread.gmane.org/gmane.org.wikimedia.mediawiki/40558 I just upgraded to MW 1.20, and now I'm getting this error after setting $wgShowExceptionDetails to true (I turn it on when I get an error message suggesting it, make a request to check, and turn it back off, don't worry): MediaWiki internal error. Original exception: exception 'BadTitleError' with message 'The requested page title was invalid, empty, or an incorrectly linked inter-language or inter-wiki title. It may contain one or more characters which cannot be used in titles.' in /xxxxxxxxxx/includes/Wiki.php:197 Stack trace: #0 /xxxxxxxxxx/includes/Wiki.php(536): MediaWiki->performRequest() #1 /xxxxxxxxxx/includes/Wiki.php(446): MediaWiki->main() #2 /xxxxxxxxxx/index.php(59): MediaWiki->run() #3 {main} Exception caught inside exception handler: exception 'MWException' with message 'PCRE needs to be compiled with --enable-unicode-properties in order for MediaWiki to function' in /xxxxxxxxxx/includes/parser/Parser.php:1528 Stack trace: #0 /xxxxxxxxxx/includes/parser/Parser.php(1160): Parser->replaceExternalLinks('') #1 /xxxxxxxxxx/includes/parser/Parser.php(370): Parser->internalParse('The requested p...') #2 /xxxxxxxxxx/includes/cache/MessageCache.php(873): Parser->parse('The requested p...', Object(Title), Object(ParserOptions), true) #3 /xxxxxxxxxx/includes/Message.php(605): MessageCache->parse('The requested p...', Object(Title), true, true, Object(Language)) #4 /xxxxxxxxxx/includes/Message.php(434): Message->parseText('The requested p...') #5 /xxxxxxxxxx/includes/Message.php(496): Message->toString() #6 /xxxxxxxxxx/includes/OutputPage.php(3528): Message->parseAsBlock() #7 /var/www/wikistates.outwardhosting.com/includes/OutputPage.php(2062): OutputPage->addWikiMsgArray('badtitletext', NULL) #8 /xxxxxxxxxx/includes/Exception.php(342): OutputPage->showErrorPage('badtitle', 'badtitletext', NULL) #9 /xxxxxxxxxx/includes/Exception.php(374): ErrorPageError->report() #10 /xxxxxxxxxx/includes/Exception.php(620): BadTitleError->report() #11 /xxxxxxxxxx/includes/Exception.php(690): MWExceptionHandler::report(Object(BadTitleError)) #12 /xxxxxxxxxx/includes/Wiki.php(449): MWExceptionHandler::handle(Object(BadTitleError)) #13 /xxxxxxxxxx/index.php(59): MediaWiki->run() #14 {main} So I downloaded my Linux distribution's source package and recompiled PCRE with the proper options and installed it in the distribution's standard location and restarted Apache, only to get the same error. I ran ldd on both the PHP executable and Apache's libphp5.so and they're pointing to the correct libpcre.so. I'm running PHP 5.3.17.
The error is generated in replaceExternalLinks() in Parser.php when preg_split() returns false. Looking at the PHP documentation (http://php.net/manual/en/function.preg-split.php), the cases preg_split() returns false are not documented. preg_match() says it returns false "if an error occurs" but the only error it documents is "if offset is higher than subject length" which I don't think applies to preg_split(). At the very least, the message (or code comments) should include a pointer to where more information can be found.
Also see bug #26297, maybe the updater should warn?
Adding Chad since he closed bug 26297
