Warning: Error while sending QUERY packet. PID=2457 in /var/lib/mediawiki/includes/libs/rdbms/database/DatabaseMysqli.php on line 46
MediaWiki internal error.

Original exception: [e7899a21b22474c58482a662] /index.php?title=914641&oldid=27392 Wikimedia\Rdbms\DBQueryError from line 1496 of /var/lib/mediawiki/includes/libs/rdbms/database/Database.php: A connection error occurred.
Query: SELECT slot_revision_id,slot_content_id,slot_origin,slot_role_id,content_size,content_sha1,content_address,content_model FROM `wik2slots` INNER JOIN `wik2content` ON ((slot_content_id = content_id)) WHERE slot_revision_id = '16577'
Function: MediaWiki\Revision\RevisionStore::loadSlotRecords
Error: 2006 MySQL server has gone away (localhost)

Backtrace:
#0 /var/lib/mediawiki/includes/libs/rdbms/database/Database.php(1466): Wikimedia\Rdbms\Database->makeQueryException(string, integer, string, string)
#1 /var/lib/mediawiki/includes/libs/rdbms/database/Database.php(1226): Wikimedia\Rdbms\Database->reportQueryError(string, integer, string, string, boolean)
#2 /var/lib/mediawiki/includes/libs/rdbms/database/Database.php(1693): Wikimedia\Rdbms\Database->query(string, string)
#3 /var/lib/mediawiki/includes/libs/rdbms/database/DBConnRef.php(49): Wikimedia\Rdbms\Database->select(array, array, array, string, array, array)
#4 /var/lib/mediawiki/includes/libs/rdbms/database/DBConnRef.php(261): Wikimedia\Rdbms\DBConnRef->__call(string, array)
#5 /var/lib/mediawiki/includes/Revision/RevisionStore.php(1617): Wikimedia\Rdbms\DBConnRef->select(array, array, array, string, array, array)
#6 /var/lib/mediawiki/includes/Revision/RevisionStore.php(1671): MediaWiki\Revision\RevisionStore->loadSlotRecords(string, integer)
#7 [internal function]: MediaWiki\Revision\RevisionStore->MediaWiki\Revision\{closure}()
#8 /var/lib/mediawiki/includes/Revision/RevisionSlots.php(165): call_user_func(Closure)
#9 /var/lib/mediawiki/includes/Revision/RevisionSlots.php(107): MediaWiki\Revision\RevisionSlots->getSlots()
#10 /var/lib/mediawiki/includes/Revision/RevisionRecord.php(192): MediaWiki\Revision\RevisionSlots->getSlot(string)
#11 /var/lib/mediawiki/includes/Revision/RevisionRecord.php(175): MediaWiki\Revision\RevisionRecord->getSlot(string, integer, NULL)
#12 /var/lib/mediawiki/includes/Revision.php(932): MediaWiki\Revision\RevisionRecord->getContent(string, integer, NULL)
#13 /var/lib/mediawiki/includes/parser/Parser.php(3706): Revision->getContent()
#14 /var/lib/mediawiki/includes/parser/Parser.php(3618): Parser->statelessFetchTemplate(Title, Parser)
#15 /var/lib/mediawiki/includes/parser/Parser.php(3552): Parser->fetchTemplateAndTitle(Title)
#16 /var/lib/mediawiki/includes/parser/Parser.php(3312): Parser->getTemplateDom(Title)
#17 /var/lib/mediawiki/includes/parser/Preprocessor_DOM.php(1279): Parser->braceSubstitution(array, PPFrame_DOM)
#18 /var/lib/mediawiki/includes/parser/Parser.php(3014): PPFrame_DOM->expand(DOMElement, integer)
#19 /var/lib/mediawiki/extensions/SemanticMediaWiki/src/Parser/RecursiveTextProcessor.php(241): Parser->replaceVariables(string)
#20 /var/lib/mediawiki/extensions/SemanticMediaWiki/src/Query/ResultPrinters/ResultPrinter.php(411): SMW\Parser\RecursiveTextProcessor->recursivePreprocess(string)
#21 /var/lib/mediawiki/extensions/SemanticMediaWiki/src/Query/ResultPrinters/ResultPrinter.php(349): SMW\Query\ResultPrinters\ResultPrinter->handleNonFileResult(string, SMW\Query\QueryResult, integer)
#22 /var/lib/mediawiki/extensions/SemanticMediaWiki/src/Query/ResultPrinters/ResultPrinter.php(311): SMW\Query\ResultPrinters\ResultPrinter->buildResult(SMW\Query\QueryResult)
#23 /var/lib/mediawiki/extensions/SemanticMediaWiki/includes/query/SMW_QueryProcessor.php(348): SMW\Query\ResultPrinters\ResultPrinter->getResult(SMW\Query\QueryResult, array, integer)
#24 /var/lib/mediawiki/extensions/SemanticMediaWiki/src/ParserFunctions/AskParserFunction.php(364): SMWQueryProcessor::getResultFromQuery(SMWQuery, array, integer, integer)
#25 /var/lib/mediawiki/extensions/SemanticMediaWiki/src/ParserFunctions/AskParserFunction.php(197): SMW\ParserFunctions\AskParserFunction->doFetchResultsFromFunctionParameters(array, array)
#26 /var/lib/mediawiki/extensions/SemanticMediaWiki/src/ParserFunctionFactory.php(402): SMW\ParserFunctions\AskParserFunction->parse(array)
#27 /var/lib/mediawiki/includes/parser/Parser.php(3493): SMW\ParserFunctionFactory->SMW\{closure}(Parser, string, string, string, string, string, string, string, string)
#28 /var/lib/mediawiki/includes/parser/Parser.php(3200): Parser->callParserFunction(PPTemplateFrame_DOM, string, array)
#29 /var/lib/mediawiki/includes/parser/Preprocessor_DOM.php(1279): Parser->braceSubstitution(array, PPTemplateFrame_DOM)
#30 /var/lib/mediawiki/includes/parser/Preprocessor_DOM.php(1729): PPFrame_DOM->expand(DOMElement, integer)
#31 /var/lib/mediawiki/includes/parser/Parser.php(3371): PPTemplateFrame_DOM->cachedExpand(string, PPNode_DOM)
#32 /var/lib/mediawiki/includes/parser/Preprocessor_DOM.php(1279): Parser->braceSubstitution(array, PPTemplateFrame_DOM)
#33 /var/lib/mediawiki/extensions/ParserFunctions/includes/ParserFunctions.php(116): PPFrame_DOM->expand(DOMElement)
#34 /var/lib/mediawiki/includes/parser/Parser.php(3493): MediaWiki\Extensions\ParserFunctions\ParserFunctions::ifObj(Parser, PPTemplateFrame_DOM, array)
#35 /var/lib/mediawiki/includes/parser/Parser.php(3200): Parser->callParserFunction(PPTemplateFrame_DOM, string, array)
#36 /var/lib/mediawiki/includes/parser/Preprocessor_DOM.php(1279): Parser->braceSubstitution(array, PPTemplateFrame_DOM)
#37 /var/lib/mediawiki/includes/parser/Parser.php(3374): PPFrame_DOM->expand(DOMElement)
#38 /var/lib/mediawiki/includes/parser/Preprocessor_DOM.php(1279): Parser->braceSubstitution(array, PPFrame_DOM)
#39 /var/lib/mediawiki/includes/parser/Parser.php(3014): PPFrame_DOM->expand(DOMElement, integer)
#40 /var/lib/mediawiki/includes/parser/Parser.php(1350): Parser->replaceVariables(string)
#41 /var/lib/mediawiki/includes/parser/Parser.php(476): Parser->internalParse(string)
#42 /var/lib/mediawiki/includes/content/WikitextContent.php(341): Parser->parse(string, Title, ParserOptions, boolean, boolean, integer)
#43 /var/lib/mediawiki/includes/content/AbstractContent.php(517): WikitextContent->fillParserOutput(Title, integer, ParserOptions, boolean, ParserOutput)
#44 /var/lib/mediawiki/includes/Revision/RenderedRevision.php(242): AbstractContent->getParserOutput(Title, integer, ParserOptions, boolean)
#45 /var/lib/mediawiki/includes/Revision/RenderedRevision.php(211): MediaWiki\Revision\RenderedRevision->getSlotParserOutputUncached(WikitextContent, boolean)
#46 /var/lib/mediawiki/includes/Revision/RevisionRenderer.php(175): MediaWiki\Revision\RenderedRevision->getSlotParserOutput(string)
#47 /var/lib/mediawiki/includes/Revision/RevisionRenderer.php(128): MediaWiki\Revision\RevisionRenderer->combineSlotOutput(MediaWiki\Revision\RenderedRevision, array)
#48 [internal function]: MediaWiki\Revision\RevisionRenderer->MediaWiki\Revision\{closure}(MediaWiki\Revision\RenderedRevision, array)
#49 /var/lib/mediawiki/includes/Revision/RenderedRevision.php(175): call_user_func(Closure, MediaWiki\Revision\RenderedRevision, array)
#50 /var/lib/mediawiki/includes/poolcounter/PoolWorkArticleView.php(194): MediaWiki\Revision\RenderedRevision->getRevisionParserOutput()
#51 /var/lib/mediawiki/includes/poolcounter/PoolCounterWork.php(123): PoolWorkArticleView->doWork()
#52 /var/lib/mediawiki/includes/page/Article.php(774): PoolCounterWork->execute()
#53 /var/lib/mediawiki/includes/actions/ViewAction.php(68): Article->view()
#54 /var/lib/mediawiki/includes/MediaWiki.php(501): ViewAction->show()
#55 /var/lib/mediawiki/includes/MediaWiki.php(294): MediaWiki->performAction(Article, Title)
#56 /var/lib/mediawiki/includes/MediaWiki.php(860): MediaWiki->performRequest()
#57 /var/lib/mediawiki/includes/MediaWiki.php(517): MediaWiki->main()
#58 /var/lib/mediawiki/index.php(46): MediaWiki->run()
#59 {main}

Exception caught inside exception handler: [e7899a21b22474c58482a662] /index.php?title=914641&oldid=27392 Wikimedia\Rdbms\DBConnectionError from line 1195 of /var/lib/mediawiki/includes/libs/rdbms/loadbalancer/LoadBalancer.php: Cannot access the database: Unknown error (localhost)
Backtrace:
#0 /var/lib/mediawiki/includes/libs/rdbms/loadbalancer/LoadBalancer.php(769): Wikimedia\Rdbms\LoadBalancer->reportConnectionError()
#1 /var/lib/mediawiki/includes/GlobalFunctions.php(2694): Wikimedia\Rdbms\LoadBalancer->getConnection(integer, array, boolean)
#2 /var/lib/mediawiki/includes/cache/localisation/LCStoreDB.php(54): wfGetDB(integer)
#3 /var/lib/mediawiki/includes/cache/localisation/LocalisationCache.php(391): LCStoreDB->get(string, string)
#4 /var/lib/mediawiki/includes/cache/localisation/LocalisationCache.php(294): LocalisationCache->loadSubitem(string, string, string)
#5 /var/lib/mediawiki/languages/Language.php(2643): LocalisationCache->getSubitem(string, string, string)
#6 /var/lib/mediawiki/includes/cache/MessageCache.php(970): Language->getMessage(string)
#7 /var/lib/mediawiki/includes/cache/MessageCache.php(928): MessageCache->getMessageForLang(Language, string, boolean, array)
#8 /var/lib/mediawiki/includes/cache/MessageCache.php(870): MessageCache->getMessageFromFallbackChain(Language, string, boolean)
#9 /var/lib/mediawiki/includes/Message.php(1299): MessageCache->get(string, boolean, Language)
#10 /var/lib/mediawiki/includes/Message.php(851): Message->fetchMessage()
#11 /var/lib/mediawiki/includes/Message.php(943): Message->toString(string)
#12 /var/lib/mediawiki/includes/exception/MWExceptionRenderer.php(132): Message->text()
#13 /var/lib/mediawiki/includes/exception/MWExceptionRenderer.php(53): MWExceptionRenderer::reportHTML(Wikimedia\Rdbms\DBQueryError)
#14 /var/lib/mediawiki/includes/exception/MWExceptionHandler.php(98): MWExceptionRenderer::output(Wikimedia\Rdbms\DBQueryError, integer)
#15 /var/lib/mediawiki/includes/exception/MWExceptionHandler.php(172): MWExceptionHandler::report(Wikimedia\Rdbms\DBQueryError)
#16 /var/lib/mediawiki/includes/MediaWiki.php(544): MWExceptionHandler::handleException(Wikimedia\Rdbms\DBQueryError)
#17 /var/lib/mediawiki/index.php(46): MediaWiki->run()
#18 {main}

Warning: Error while sending QUERY packet. PID=2457 in /var/lib/mediawiki/includes/libs/rdbms/database/DatabaseMysqli.php on line 46