Seen on /wiki/Special:LanguageStats:
Expectation (masterConns <= 0) by MediaWiki::main not met: [connect to 10.64.16.30 (metawiki)] TransactionProfiler.php line 311 calls wfBacktrace() TransactionProfiler.php line 146 calls TransactionProfiler->reportExpectationViolated() LoadBalancer.php line 571 calls TransactionProfiler->recordConnection() GlobalFunctions.php line 3122 calls LoadBalancer->getConnection() MessageGroupStats.php line 463 calls wfGetDB() MessageGroupStats.php line 113 calls MessageGroupStats::queueUpdates() SpecialLanguageStats.php line 370 calls MessageGroupStats::forLanguage() SpecialLanguageStats.php line 157 calls SpecialLanguageStats->getTable() SpecialPage.php line 417 calls SpecialLanguageStats->execute() SpecialPageFactory.php line 572 calls SpecialPage->run() MediaWiki.php line 282 calls SpecialPageFactory::executePath() MediaWiki.php line 745 calls MediaWiki->performRequest() MediaWiki.php line 519 calls MediaWiki->main() index.php line 43 calls MediaWiki->run() index.php line 3 calls include()