There is a bug breaks *all* file uploads when using PdfHandler with MediaWiki 1.21. The exception is:
Detected bug in an extension! Hook CreatePdfThumbnailsJob::insertJobs failed to return a value; should return true to continue hook processing or false to abort.
Backtrace:
#0 /srv/www/mediawiki/public_html/w/includes/GlobalFunctions.php(3883): Hooks::run('UploadVerifyFil...', Array)
#1 /srv/www/mediawiki/public_html/w/includes/upload/UploadBase.php(430): wfRunHooks('UploadVerifyFil...', Array)
#2 /srv/www/mediawiki/public_html/w/includes/upload/UploadBase.php(299): UploadBase->verifyFile()
#3 /srv/www/mediawiki/public_html/w/includes/upload/UploadFromFile.php(97): UploadBase->verifyUpload()
#4 /srv/www/mediawiki/public_html/w/includes/specials/SpecialUpload.php(406): UploadFromFile->verifyUpload()
#5 /srv/www/mediawiki/public_html/w/includes/specials/SpecialUpload.php(172): SpecialUpload->processUpload()
#6 /srv/www/mediawiki/public_html/w/includes/SpecialPage.php(613): SpecialUpload->execute(NULL)
#7 /srv/www/mediawiki/public_html/w/includes/SpecialPageFactory.php(487): SpecialPage->run(NULL)
#8 /srv/www/mediawiki/public_html/w/includes/Wiki.php(291): SpecialPageFactory::executePath(Object(Title), Object(RequestContext))
#9 /srv/www/mediawiki/public_html/w/includes/Wiki.php(565): MediaWiki->performRequest()
#10 /srv/www/mediawiki/public_html/w/includes/Wiki.php(458): MediaWiki->main()
#11 /srv/www/mediawiki/public_html/w/index.php(59): MediaWiki->run()
#12 {main}
I'm guessing this has to do with the changes to the job queue in 1.21. I've temporarily disabled the extension. This exception will be thrown for uploads of any type, not just PDF uploads.
Version: master
Severity: critical
Whiteboard: aklapper-moreinfo
URL: https://www.mediawiki.org/wiki/Extension:PdfHandler