Warning: Error while sending QUERY packet. PID=10767 in /var/www/mediawiki/root/includes/libs/rdbms/database/DatabaseMysqli.php on line 46
MediaWiki internal error.

Original exception: [575f8a56d72025c75909bc9f] /chinese/grammar/Keywords RuntimeException from line 291 of /var/www/mediawiki/root/extensions/SemanticMediaWiki/src/MediaWiki/Connection/Database.php: A connection error occurred during a query.
Query: SELECT DISTINCT t0.smw_id AS id,t0.smw_title AS t,t0.smw_namespace AS ns,t0.smw_iw AS iw,t0.smw_subobject AS so,t0.smw_sortkey AS sortkey,t0.smw_sort FROM `smw_object_ids` AS t0 WHERE t0.smw_id='9336' AND t0.smw_iw!=':smw' AND t0.smw_iw!=':smw-delete' AND t0.smw_iw!=':smw-redi' ORDER BY t0.smw_sort ASC LIMIT 55
Function: SMW\SQLStore\QueryEngine\QueryEngine::getInstanceQueryResult
Error: 2006 MySQL server has gone away (localhost)

#0 /var/www/mediawiki/root/includes/libs/rdbms/database/Database.php(1556): Wikimedia\Rdbms\Database->getQueryExceptionAndLog('MySQL server ha...', 2006, 'SELECT DISTINC...', 'SMW\\SQLStore\\Qu...')
#1 /var/www/mediawiki/root/includes/libs/rdbms/database/Database.php(1274): Wikimedia\Rdbms\Database->reportQueryError('MySQL server ha...', 2006, 'SELECT DISTINC...', 'SMW\\SQLStore\\Qu...', false)
#2 /var/www/mediawiki/root/includes/libs/rdbms/database/Database.php(1784): Wikimedia\Rdbms\Database->query('SELECT DISTINC...', 'SMW\\SQLStore\\Qu...')
#3 /var/www/mediawiki/root/includes/libs/rdbms/database/DBConnRef.php(53): Wikimedia\Rdbms\Database->select('`smw_object_ids...', 'DISTINCT t0.smw...', 't0.smw_id='9336...', 'SMW\\SQLStore\\Qu...', Array, Array)
#4 /var/www/mediawiki/root/includes/libs/rdbms/database/DBConnRef.php(297): Wikimedia\Rdbms\DBConnRef->__call('select', Array)
#5 /var/www/mediawiki/root/extensions/SemanticMediaWiki/src/MediaWiki/Connection/Database.php(288): Wikimedia\Rdbms\DBConnRef->select('`smw_object_ids...', 'DISTINCT t0.smw...', 't0.smw_id='9336...', 'SMW\\SQLStore\\Qu...', Array, Array)
#6 /var/www/mediawiki/root/extensions/SemanticMediaWiki/src/SQLStore/QueryEngine/QueryEngine.php(417): SMW\MediaWiki\Connection\Database->select('`smw_object_ids...', 'DISTINCT t0.smw...', 't0.smw_id='9336...', 'SMW\\SQLStore\\Qu...', Array)
#7 /var/www/mediawiki/root/extensions/SemanticMediaWiki/src/SQLStore/QueryEngine/QueryEngine.php(224): SMW\SQLStore\QueryEngine\QueryEngine->getInstanceQueryResult(Object(SMWQuery), 0)
#8 /var/www/mediawiki/root/extensions/SemanticMediaWiki/src/SQLStore/SQLStore.php(369): SMW\SQLStore\QueryEngine\QueryEngine->getQueryResult(Object(SMWQuery))
#9 /var/www/mediawiki/root/extensions/SemanticMediaWiki/src/SQLStore/SQLStore.php(357): SMW\SQLStore\SQLStore->fetchQueryResult(Object(SMWQuery))
#10 /var/www/mediawiki/root/extensions/SemanticMediaWiki/includes/query/SMW_QueryProcessor.php(338): SMW\SQLStore\SQLStore->getQueryResult(Object(SMWQuery))
#11 /var/www/mediawiki/root/extensions/SemanticMediaWiki/src/ParserFunctions/AskParserFunction.php(364): SMWQueryProcessor::getResultFromQuery(Object(SMWQuery), Array, 2, 1001)
#12 /var/www/mediawiki/root/extensions/SemanticMediaWiki/src/ParserFunctions/AskParserFunction.php(197): SMW\ParserFunctions\AskParserFunction->doFetchResultsFromFunctionParameters(Array, Array)
#13 /var/www/mediawiki/root/extensions/SemanticMediaWiki/src/ParserFunctionFactory.php(402): SMW\ParserFunctions\AskParserFunction->parse(Array)
#14 /var/www/mediawiki/root/includes/parser/Parser.php(3528): SMW\ParserFunctionFactory->SMW\{closure}(Object(Parser), '[[\xE4\xB8\x8D\xE6\x84\xA7\xE6\x98\xAF]]', '?pinyin=', '?toneless pinyi...', 'link=none', 'headers=hide', 'format=template', 'template=Keywor...')
#15 /var/www/mediawiki/root/includes/parser/Parser.php(3235): Parser->callParserFunction(Object(PPFrame_DOM), 'ask', Array)
#16 /var/www/mediawiki/root/includes/parser/Preprocessor_DOM.php(1285): Parser->braceSubstitution(Array, Object(PPFrame_DOM))
#17 /var/www/mediawiki/root/extensions/Arrays/Arrays.php(351): PPFrame_DOM->expand(Object(DOMElement))
#18 /var/www/mediawiki/root/includes/parser/Parser.php(3528): ExtArrays::pfObj_arrayprint(Object(Parser), Object(PPFrame_DOM), Array)
#19 /var/www/mediawiki/root/includes/parser/Parser.php(3235): Parser->callParserFunction(Object(PPFrame_DOM), 'arrayprint', Array)
#20 /var/www/mediawiki/root/includes/parser/Preprocessor_DOM.php(1285): Parser->braceSubstitution(Array, Object(PPFrame_DOM))
#21 /var/www/mediawiki/root/includes/parser/Parser.php(3049): PPFrame_DOM->expand(Object(DOMElement), 0)
#22 /var/www/mediawiki/root/includes/parser/Parser.php(1359): Parser->replaceVariables('The following k...')
#23 /var/www/mediawiki/root/includes/parser/Parser.php(491): Parser->internalParse('The following k...')
#24 /var/www/mediawiki/root/includes/content/WikitextContent.php(369): Parser->parse('The following k...', Object(Title), Object(ParserOptions), true, true, 49085)
#25 /var/www/mediawiki/root/includes/content/AbstractContent.php(555): WikitextContent->fillParserOutput(Object(Title), 49085, Object(ParserOptions), true, Object(ParserOutput))
#26 /var/www/mediawiki/root/includes/Revision/RenderedRevision.php(265): AbstractContent->getParserOutput(Object(Title), 49085, Object(ParserOptions), true)
#27 /var/www/mediawiki/root/includes/Revision/RenderedRevision.php(234): MediaWiki\Revision\RenderedRevision->getSlotParserOutputUncached(Object(WikitextContent), true)
#28 /var/www/mediawiki/root/includes/Revision/RevisionRenderer.php(193): MediaWiki\Revision\RenderedRevision->getSlotParserOutput('main')
#29 /var/www/mediawiki/root/includes/Revision/RevisionRenderer.php(142): MediaWiki\Revision\RevisionRenderer->combineSlotOutput(Object(MediaWiki\Revision\RenderedRevision), Array)
#30 [internal function]: MediaWiki\Revision\RevisionRenderer->MediaWiki\Revision\{closure}(Object(MediaWiki\Revision\RenderedRevision), Array)
#31 /var/www/mediawiki/root/includes/Revision/RenderedRevision.php(197): call_user_func(Object(Closure), Object(MediaWiki\Revision\RenderedRevision), Array)
#32 /var/www/mediawiki/root/includes/poolcounter/PoolWorkArticleView.php(194): MediaWiki\Revision\RenderedRevision->getRevisionParserOutput()
#33 /var/www/mediawiki/root/includes/poolcounter/PoolCounterWork.php(123): PoolWorkArticleView->doWork()
#34 /var/www/mediawiki/root/includes/page/Article.php(773): PoolCounterWork->execute()
#35 /var/www/mediawiki/root/includes/actions/ViewAction.php(68): Article->view()
#36 /var/www/mediawiki/root/includes/MediaWiki.php(499): ViewAction->show()
#37 /var/www/mediawiki/root/includes/MediaWiki.php(294): MediaWiki->performAction(Object(Article), Object(Title))
#38 /var/www/mediawiki/root/includes/MediaWiki.php(865): MediaWiki->performRequest()
#39 /var/www/mediawiki/root/includes/MediaWiki.php(515): MediaWiki->main()
#40 /var/www/mediawiki/root/index.php(42): MediaWiki->run()
#41 {main}
Backtrace:
#0 /var/www/mediawiki/root/extensions/SemanticMediaWiki/src/SQLStore/QueryEngine/QueryEngine.php(417): SMW\MediaWiki\Connection\Database->select(string, string, string, string, array)
#1 /var/www/mediawiki/root/extensions/SemanticMediaWiki/src/SQLStore/QueryEngine/QueryEngine.php(224): SMW\SQLStore\QueryEngine\QueryEngine->getInstanceQueryResult(SMWQuery, integer)
#2 /var/www/mediawiki/root/extensions/SemanticMediaWiki/src/SQLStore/SQLStore.php(369): SMW\SQLStore\QueryEngine\QueryEngine->getQueryResult(SMWQuery)
#3 /var/www/mediawiki/root/extensions/SemanticMediaWiki/src/SQLStore/SQLStore.php(357): SMW\SQLStore\SQLStore->fetchQueryResult(SMWQuery)
#4 /var/www/mediawiki/root/extensions/SemanticMediaWiki/includes/query/SMW_QueryProcessor.php(338): SMW\SQLStore\SQLStore->getQueryResult(SMWQuery)
#5 /var/www/mediawiki/root/extensions/SemanticMediaWiki/src/ParserFunctions/AskParserFunction.php(364): SMWQueryProcessor::getResultFromQuery(SMWQuery, array, integer, integer)
#6 /var/www/mediawiki/root/extensions/SemanticMediaWiki/src/ParserFunctions/AskParserFunction.php(197): SMW\ParserFunctions\AskParserFunction->doFetchResultsFromFunctionParameters(array, array)
#7 /var/www/mediawiki/root/extensions/SemanticMediaWiki/src/ParserFunctionFactory.php(402): SMW\ParserFunctions\AskParserFunction->parse(array)
#8 /var/www/mediawiki/root/includes/parser/Parser.php(3528): SMW\ParserFunctionFactory->SMW\{closure}(Parser, string, string, string, string, string, string, string)
#9 /var/www/mediawiki/root/includes/parser/Parser.php(3235): Parser->callParserFunction(PPFrame_DOM, string, array)
#10 /var/www/mediawiki/root/includes/parser/Preprocessor_DOM.php(1285): Parser->braceSubstitution(array, PPFrame_DOM)
#11 /var/www/mediawiki/root/extensions/Arrays/Arrays.php(351): PPFrame_DOM->expand(DOMElement)
#12 /var/www/mediawiki/root/includes/parser/Parser.php(3528): ExtArrays::pfObj_arrayprint(Parser, PPFrame_DOM, array)
#13 /var/www/mediawiki/root/includes/parser/Parser.php(3235): Parser->callParserFunction(PPFrame_DOM, string, array)
#14 /var/www/mediawiki/root/includes/parser/Preprocessor_DOM.php(1285): Parser->braceSubstitution(array, PPFrame_DOM)
#15 /var/www/mediawiki/root/includes/parser/Parser.php(3049): PPFrame_DOM->expand(DOMElement, integer)
#16 /var/www/mediawiki/root/includes/parser/Parser.php(1359): Parser->replaceVariables(string)
#17 /var/www/mediawiki/root/includes/parser/Parser.php(491): Parser->internalParse(string)
#18 /var/www/mediawiki/root/includes/content/WikitextContent.php(369): Parser->parse(string, Title, ParserOptions, boolean, boolean, integer)
#19 /var/www/mediawiki/root/includes/content/AbstractContent.php(555): WikitextContent->fillParserOutput(Title, integer, ParserOptions, boolean, ParserOutput)
#20 /var/www/mediawiki/root/includes/Revision/RenderedRevision.php(265): AbstractContent->getParserOutput(Title, integer, ParserOptions, boolean)
#21 /var/www/mediawiki/root/includes/Revision/RenderedRevision.php(234): MediaWiki\Revision\RenderedRevision->getSlotParserOutputUncached(WikitextContent, boolean)
#22 /var/www/mediawiki/root/includes/Revision/RevisionRenderer.php(193): MediaWiki\Revision\RenderedRevision->getSlotParserOutput(string)
#23 /var/www/mediawiki/root/includes/Revision/RevisionRenderer.php(142): MediaWiki\Revision\RevisionRenderer->combineSlotOutput(MediaWiki\Revision\RenderedRevision, array)
#24 [internal function]: MediaWiki\Revision\RevisionRenderer->MediaWiki\Revision\{closure}(MediaWiki\Revision\RenderedRevision, array)
#25 /var/www/mediawiki/root/includes/Revision/RenderedRevision.php(197): call_user_func(Closure, MediaWiki\Revision\RenderedRevision, array)
#26 /var/www/mediawiki/root/includes/poolcounter/PoolWorkArticleView.php(194): MediaWiki\Revision\RenderedRevision->getRevisionParserOutput()
#27 /var/www/mediawiki/root/includes/poolcounter/PoolCounterWork.php(123): PoolWorkArticleView->doWork()
#28 /var/www/mediawiki/root/includes/page/Article.php(773): PoolCounterWork->execute()
#29 /var/www/mediawiki/root/includes/actions/ViewAction.php(68): Article->view()
#30 /var/www/mediawiki/root/includes/MediaWiki.php(499): ViewAction->show()
#31 /var/www/mediawiki/root/includes/MediaWiki.php(294): MediaWiki->performAction(Article, Title)
#32 /var/www/mediawiki/root/includes/MediaWiki.php(865): MediaWiki->performRequest()
#33 /var/www/mediawiki/root/includes/MediaWiki.php(515): MediaWiki->main()
#34 /var/www/mediawiki/root/index.php(42): MediaWiki->run()
#35 {main}

Exception caught inside exception handler: [575f8a56d72025c75909bc9f] /chinese/grammar/Keywords Wikimedia\Rdbms\DBConnectionError from line 1213 of /var/www/mediawiki/root/includes/libs/rdbms/loadbalancer/LoadBalancer.php: Cannot access the database: Unknown error (localhost)
Backtrace:
#0 /var/www/mediawiki/root/includes/libs/rdbms/loadbalancer/LoadBalancer.php(758): Wikimedia\Rdbms\LoadBalancer->reportConnectionError()
#1 /var/www/mediawiki/root/extensions/WikiSEO/includes/WikiSEO.php(143): Wikimedia\Rdbms\LoadBalancer->getConnection(integer)
#2 /var/www/mediawiki/root/extensions/WikiSEO/includes/WikiSEO.php(128): MediaWiki\Extension\WikiSEO\WikiSEO->loadPagePropsFromDb(integer)
#3 /var/www/mediawiki/root/extensions/WikiSEO/includes/Hooks.php(36): MediaWiki\Extension\WikiSEO\WikiSEO->setMetadataFromPageProps(OutputPage)
#4 /var/www/mediawiki/root/includes/Hooks.php(174): MediaWiki\Extension\WikiSEO\Hooks::onBeforePageDisplay(OutputPage, SkinAllSet)
#5 /var/www/mediawiki/root/includes/Hooks.php(234): Hooks::callHook(string, array, array, NULL, string)
#6 /var/www/mediawiki/root/includes/OutputPage.php(2720): Hooks::runWithoutAbort(string, array)
#7 /var/www/mediawiki/root/includes/exception/MWExceptionRenderer.php(134): OutputPage->output()
#8 /var/www/mediawiki/root/includes/exception/MWExceptionRenderer.php(53): MWExceptionRenderer::reportHTML(RuntimeException)
#9 /var/www/mediawiki/root/includes/exception/MWExceptionHandler.php(98): MWExceptionRenderer::output(RuntimeException, integer)
#10 /var/www/mediawiki/root/includes/exception/MWExceptionHandler.php(172): MWExceptionHandler::report(RuntimeException)
#11 /var/www/mediawiki/root/includes/MediaWiki.php(542): MWExceptionHandler::handleException(RuntimeException)
#12 /var/www/mediawiki/root/index.php(42): MediaWiki->run()
#13 {main}

Warning: Error while sending QUERY packet. PID=10767 in /var/www/mediawiki/root/includes/libs/rdbms/database/DatabaseMysqli.php on line 46