I have seen this couple of times when running message cache rebuild. Possibly only happens when some cache is expired together with expired localisation cache.
RuntimeException from line 448 of /www/dev.translatewiki.net/docroot/w/includes/libs/services/ServiceContainer.php: Circular dependency when creating service! ResourceLoader -> ResourceLoader #0 /www/dev.translatewiki.net/docroot/w/includes/libs/services/ServiceContainer.php(427): Wikimedia\Services\ServiceContainer->createService('ResourceLoader') #1 /www/dev.translatewiki.net/docroot/w/includes/MediaWikiServices.php(919): Wikimedia\Services\ServiceContainer->getService('ResourceLoader') #2 /www/dev.translatewiki.net/docroot/w/includes/ServiceWiring.php(336): MediaWiki\MediaWikiServices->getResourceLoader() #3 /www/dev.translatewiki.net/docroot/w/includes/cache/localisation/LocalisationCache.php(1049): Wikimedia\Services\ServiceContainer->{closure}() #4 /www/dev.translatewiki.net/docroot/w/includes/cache/localisation/LocalisationCache.php(489): LocalisationCache->recache('en') #5 /www/dev.translatewiki.net/docroot/w/includes/cache/localisation/LocalisationCache.php(363): LocalisationCache->initLanguage('en') #6 /www/dev.translatewiki.net/docroot/w/includes/cache/localisation/LocalisationCache.php(304): LocalisationCache->loadItem('en', 'namespaceGender...') #7 /www/dev.translatewiki.net/docroot/w/languages/Language.php(615): LocalisationCache->getItem('en', 'namespaceGender...') #8 /www/dev.translatewiki.net/docroot/w/includes/title/MediaWikiTitleCodec.php(101): Language->needsGenderDistinction() #9 /www/dev.translatewiki.net/docroot/w/includes/title/MediaWikiTitleCodec.php(138): MediaWikiTitleCodec->getNamespaceName(8, 'Gadgets-definit...') #10 /www/dev.translatewiki.net/docroot/w/includes/title/MediaWikiTitleCodec.php(260): MediaWikiTitleCodec->formatTitle(8, 'Gadgets-definit...', '', '') #11 /www/dev.translatewiki.net/docroot/w/includes/cache/LinkCache.php(246): MediaWikiTitleCodec->getPrefixedDBkey(Object(Title)) #12 /www/dev.translatewiki.net/docroot/w/includes/Title.php(3182): LinkCache->addLinkObj(Object(Title)) #13 /www/dev.translatewiki.net/docroot/w/includes/Revision/RevisionRecord.php(109): Title->getArticleID() #14 /www/dev.translatewiki.net/docroot/w/includes/Revision/RevisionStoreRecord.php(64): MediaWiki\Revision\RevisionRecord->__construct(Object(Title), Object(MediaWiki\Revision\RevisionSlots), false) #15 /www/dev.translatewiki.net/docroot/w/includes/Revision/RevisionStore.php(1893): MediaWiki\Revision\RevisionStoreRecord->__construct(Object(Title), Object(User), Object(CommentStoreComment), Object(stdClass), Object(MediaWiki\Revision\RevisionSlots), false) #16 /www/dev.translatewiki.net/docroot/w/includes/Revision/RevisionStore.php(1816): MediaWiki\Revision\RevisionStore->newRevisionFromRowAndSlots(Object(stdClass), Object(MediaWiki\Revision\RevisionSlots), 0, Object(Title), false) #17 /www/dev.translatewiki.net/docroot/w/includes/Revision/RevisionStore.php(2538): MediaWiki\Revision\RevisionStore->newRevisionFromRow(Object(stdClass), 0, Object(Title)) #18 /www/dev.translatewiki.net/docroot/w/includes/Revision/RevisionStore.php(1513): MediaWiki\Revision\RevisionStore->loadRevisionFromConds(Object(Wikimedia\Rdbms\DBConnRef), Array, 0, Object(Title)) #19 /www/dev.translatewiki.net/docroot/w/includes/Revision.php(139): MediaWiki\Revision\RevisionStore->getRevisionByTitle(Object(Title), 0, 0) #20 /www/dev.translatewiki.net/docroot/w/extensions/Gadgets/includes/MediaWikiGadgetsDefinitionRepo.php(139): Revision::newFromTitle(Object(Title)) #21 /www/dev.translatewiki.net/docroot/w/extensions/Gadgets/includes/MediaWikiGadgetsDefinitionRepo.php(108): MediaWikiGadgetsDefinitionRepo->fetchStructuredList() #22 /www/dev.translatewiki.net/docroot/w/includes/libs/objectcache/wancache/WANObjectCache.php(1424): MediaWikiGadgetsDefinitionRepo->{closure}(false, 86400, Array, NULL) #23 /www/dev.translatewiki.net/docroot/w/includes/libs/objectcache/wancache/WANObjectCache.php(1278): WANObjectCache->fetchOrRegenerate('sw:gadgets-defi...', 86400, Object(Closure), Array) #24 /www/dev.translatewiki.net/docroot/w/extensions/Gadgets/includes/MediaWikiGadgetsDefinitionRepo.php(115): WANObjectCache->getWithSetCallback('sw:gadgets-defi...', 86400, Object(Closure), Array) #25 /www/dev.translatewiki.net/docroot/w/extensions/Gadgets/includes/MediaWikiGadgetsDefinitionRepo.php(31): MediaWikiGadgetsDefinitionRepo->loadGadgets() #26 /www/dev.translatewiki.net/docroot/w/extensions/Gadgets/includes/GadgetHooks.php(134): MediaWikiGadgetsDefinitionRepo->getGadgetIds() #27 /www/dev.translatewiki.net/docroot/w/includes/Hooks.php(174): GadgetHooks::registerModules(Object(ResourceLoader)) #28 /www/dev.translatewiki.net/docroot/w/includes/Hooks.php(202): Hooks::callHook('ResourceLoaderR...', Array, Array, NULL) #29 /www/dev.translatewiki.net/docroot/w/includes/ServiceWiring.php(703): Hooks::run('ResourceLoaderR...', Array) #30 /www/dev.translatewiki.net/docroot/w/includes/libs/services/ServiceContainer.php(458): Wikimedia\Services\ServiceContainer->{closure}(Object(MediaWiki\MediaWikiServices)) #31 /www/dev.translatewiki.net/docroot/w/includes/libs/services/ServiceContainer.php(427): Wikimedia\Services\ServiceContainer->createService('ResourceLoader') #32 /www/dev.translatewiki.net/docroot/w/includes/MediaWikiServices.php(919): Wikimedia\Services\ServiceContainer->getService('ResourceLoader') #33 /www/dev.translatewiki.net/docroot/w/maintenance/rebuildLocalisationCache.php(98): MediaWiki\MediaWikiServices->getResourceLoader() #34 /www/dev.translatewiki.net/docroot/w/includes/cache/localisation/LocalisationCache.php(1049): RebuildLocalisationCache->{closure}() #35 /www/dev.translatewiki.net/docroot/w/includes/cache/localisation/LocalisationCacheBulkLoad.php(100): LocalisationCache->recache('ab') #36 /www/dev.translatewiki.net/docroot/w/maintenance/rebuildLocalisationCache.php(178): LocalisationCacheBulkLoad->recache('ab') #37 /www/dev.translatewiki.net/docroot/w/maintenance/rebuildLocalisationCache.php(134): RebuildLocalisationCache->doRebuild(Array, Object(LocalisationCacheBulkLoad), false) #38 /www/dev.translatewiki.net/docroot/w/maintenance/doMaintenance.php(99): RebuildLocalisationCache->execute() #39 /www/dev.translatewiki.net/docroot/w/maintenance/rebuildLocalisationCache.php(197): require_once('/www/dev.transl...') #40 {main}