Fatal exception of type "Wikibase\DataModel\Services\Lookup\EntityLookupException"
Closed, DuplicatePublicPRODUCTION ERROR
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Assigned To

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Authored By

	AlexisJazz
	Apr 2 2026, 10:46 AM

Description

Steps to replicate the issue (include links if applicable):

Tried to view https://commons.wikimedia.org/wiki/File:Gierige_Gasten_VIPS_Sophie_Milzink_2_(cropped).jpg

What happens?:

MediaWiki internal error.

Original exception: [87a3a1b9-4e3a-4521-a0b6-3d4afc1e6191] 2026-04-02 10:41:51: Fatal exception of type "Wikibase\DataModel\Services\Lookup\EntityLookupException"

Exception caught inside exception handler.

Set $wgShowExceptionDetails = true; at the bottom of LocalSettings.php to show detailed debugging information.

What should have happened instead?:
Page load

Other information (browser name/version, screenshots, etc.):
Timing coincides with T422130. Coincidence?

Related Objects

Mentioned Here: T422130: External store unreachable: "Database servers in clusterXX are overloaded"

Event Timeline

AlexisJazz created this task.Apr 2 2026, 10:46 AM

Restricted Application changed the subtype of this task from "Bug Report" to "Production Error". · View Herald TranscriptApr 2 2026, 10:46 AM

Restricted Application added a subscriber: Aklapper. · View Herald Transcript

Lucas_Werkmeister_WMDE edited projects, added Wikidata; removed Wikibase Architecture.Apr 2 2026, 11:17 AM

Error

mwversion: 1.46.0-wmf.22
timestamp: 2026-04-02T10:41:51.734Z
phpversion: 8.3.30
reqId: 87a3a1b9-4e3a-4521-a0b6-3d4afc1e6191
Find reqId in Logstash

normalized_message

[{reqId}] {exception_url}   Wikibase\DataModel\Services\Lookup\EntityLookupException: Cannot access the database: Database servers in cluster26 are overloaded. In order to protect application servers, the circuit breaking to databases of this section have

Frame	Location	Call
from	/srv/mediawiki/php-1.46.0-wmf.22/extensions/Wikibase/lib/includes/Store/RevisionBasedEntityLookup.php(51)
#0	/srv/mediawiki/php-1.46.0-wmf.22/extensions/Wikibase/lib/packages/wikibase/data-model-services/src/Lookup/RedirectResolvingEntityLookup.php(51)	Wikibase\Lib\Store\RevisionBasedEntityLookup->getEntity(Wikibase\MediaInfo\DataModel\MediaInfoId)
#1	/srv/mediawiki/php-1.46.0-wmf.22/extensions/WikibaseMediaInfo/src/MediaInfoHooks.php(200)	Wikibase\DataModel\Services\Lookup\RedirectResolvingEntityLookup->getEntity(Wikibase\MediaInfo\DataModel\MediaInfoId)
#2	/srv/mediawiki/php-1.46.0-wmf.22/includes/HookContainer/HookContainer.php(135)	Wikibase\MediaInfo\MediaInfoHooks->onBeforePageDisplay(MediaWiki\Output\OutputPage, MediaWiki\Skins\Vector\SkinVectorLegacy)
#3	/srv/mediawiki/php-1.46.0-wmf.22/includes/HookContainer/HookRunner.php(1022)	MediaWiki\HookContainer\HookContainer->run(string, array, array)
#4	/srv/mediawiki/php-1.46.0-wmf.22/includes/Output/OutputPage.php(3306)	MediaWiki\HookContainer\HookRunner->onBeforePageDisplay(MediaWiki\Output\OutputPage, MediaWiki\Skins\Vector\SkinVectorLegacy)
#5	/srv/mediawiki/php-1.46.0-wmf.22/includes/Actions/ActionEntryPoint.php(162)	MediaWiki\Output\OutputPage->output(bool)
#6	/srv/mediawiki/php-1.46.0-wmf.22/includes/MediaWikiEntryPoint.php(180)	MediaWiki\Actions\ActionEntryPoint->execute()
#7	/srv/mediawiki/php-1.46.0-wmf.22/index.php(44)	MediaWiki\MediaWikiEntryPoint->run()
#8	/srv/mediawiki/w/index.php(3)	require(string)
#9	{main}

exception.previous.trace

from /srv/mediawiki/php-1.46.0-wmf.22/includes/libs/Rdbms/LoadMonitor/LoadMonitor.php(111)
#0 /srv/mediawiki/php-1.46.0-wmf.22/includes/libs/Rdbms/LoadBalancer/LoadBalancer.php(462): Wikimedia\Rdbms\LoadMonitor->scaleLoads(array)
#1 /srv/mediawiki/php-1.46.0-wmf.22/includes/libs/Rdbms/LoadBalancer/LoadBalancer.php(777): Wikimedia\Rdbms\LoadBalancer->getReaderIndex(string)
#2 /srv/mediawiki/php-1.46.0-wmf.22/includes/libs/Rdbms/Database/DBConnRef.php(109): Wikimedia\Rdbms\LoadBalancer->getConnectionInternal(int, array, string, int)
#3 /srv/mediawiki/php-1.46.0-wmf.22/includes/libs/Rdbms/Database/DBConnRef.php(127): Wikimedia\Rdbms\DBConnRef->ensureConnection()
#4 /srv/mediawiki/php-1.46.0-wmf.22/includes/libs/Rdbms/Database/DBConnRef.php(371): Wikimedia\Rdbms\DBConnRef->__call(string, array)
#5 /srv/mediawiki/php-1.46.0-wmf.22/includes/libs/Rdbms/QueryBuilder/SelectQueryBuilder.php(779): Wikimedia\Rdbms\DBConnRef->selectField(array, string, array, string, array, array)
#6 /srv/mediawiki/php-1.46.0-wmf.22/includes/ExternalStore/ExternalStoreDB.php(304): Wikimedia\Rdbms\SelectQueryBuilder->fetchField()
#7 /srv/mediawiki/php-1.46.0-wmf.22/includes/ExternalStore/ExternalStoreDB.php(58): MediaWiki\ExternalStore\ExternalStoreDB->fetchBlob(string, string, bool)
#8 /srv/mediawiki/php-1.46.0-wmf.22/includes/ExternalStore/ExternalStoreAccess.php(62): MediaWiki\ExternalStore\ExternalStoreDB->fetchFromURL(string)
#9 /srv/mediawiki/php-1.46.0-wmf.22/includes/Storage/SqlBlobStore.php(533): MediaWiki\ExternalStore\ExternalStoreAccess->fetchFromURL(string, array)
#10 /srv/mediawiki/php-1.46.0-wmf.22/includes/libs/ObjectCache/WANObjectCache.php(1831): MediaWiki\Storage\SqlBlobStore->MediaWiki\Storage\{closure}(bool, int, array, null, array)
#11 /srv/mediawiki/php-1.46.0-wmf.22/includes/libs/ObjectCache/WANObjectCache.php(1641): Wikimedia\ObjectCache\WANObjectCache->fetchOrRegenerate(string, int, Closure, array, array)
#12 /srv/mediawiki/php-1.46.0-wmf.22/includes/Storage/SqlBlobStore.php(527): Wikimedia\ObjectCache\WANObjectCache->getWithSetCallback(string, int, Closure, array)
#13 /srv/mediawiki/php-1.46.0-wmf.22/includes/Storage/SqlBlobStore.php(310): MediaWiki\Storage\SqlBlobStore->expandBlob(string, array, string)
#14 /srv/mediawiki/php-1.46.0-wmf.22/includes/Storage/SqlBlobStore.php(226): MediaWiki\Storage\SqlBlobStore->fetchBlobs(array, int)
#15 /srv/mediawiki/php-1.46.0-wmf.22/includes/libs/ObjectCache/WANObjectCache.php(1831): MediaWiki\Storage\SqlBlobStore->MediaWiki\Storage\{closure}(bool, int, array, null, array)
#16 /srv/mediawiki/php-1.46.0-wmf.22/includes/libs/ObjectCache/WANObjectCache.php(1641): Wikimedia\ObjectCache\WANObjectCache->fetchOrRegenerate(string, int, Closure, array, array)
#17 /srv/mediawiki/php-1.46.0-wmf.22/includes/Storage/SqlBlobStore.php(221): Wikimedia\ObjectCache\WANObjectCache->getWithSetCallback(string, int, Closure, array)
#18 /srv/mediawiki/php-1.46.0-wmf.22/extensions/Wikibase/lib/includes/Store/Sql/WikiPageEntityDataLoader.php(82): MediaWiki\Storage\SqlBlobStore->getBlob(string, int)
#19 /srv/mediawiki/php-1.46.0-wmf.22/extensions/Wikibase/lib/includes/Store/Sql/WikiPageEntityRevisionLookup.php(226): Wikibase\Lib\Store\Sql\WikiPageEntityDataLoader->loadEntityDataFromWikiPageRevision(MediaWiki\Revision\RevisionStoreRecord, string, int)
#20 /srv/mediawiki/php-1.46.0-wmf.22/extensions/Wikibase/lib/includes/Store/Sql/WikiPageEntityRevisionLookup.php(111): Wikibase\Lib\Store\Sql\WikiPageEntityRevisionLookup->loadEntity(stdClass, string)
#21 /srv/mediawiki/php-1.46.0-wmf.22/extensions/WikibaseMediaInfo/src/DataAccess/Store/EntityIdFixingRevisionLookup.php(40): Wikibase\Lib\Store\Sql\WikiPageEntityRevisionLookup->getEntityRevision(Wikibase\MediaInfo\DataModel\MediaInfoId, int, string)
#22 /srv/mediawiki/php-1.46.0-wmf.22/extensions/WikibaseMediaInfo/src/DataAccess/Store/FilePageRedirectHandlingRevisionLookup.php(43): Wikibase\MediaInfo\DataAccess\Store\EntityIdFixingRevisionLookup->getEntityRevision(Wikibase\MediaInfo\DataModel\MediaInfoId, int, string)
#23 /srv/mediawiki/php-1.46.0-wmf.22/extensions/Wikibase/lib/includes/Store/TypeDispatchingEntityRevisionLookup.php(51): Wikibase\MediaInfo\DataAccess\Store\FilePageRedirectHandlingRevisionLookup->getEntityRevision(Wikibase\MediaInfo\DataModel\MediaInfoId, int, string)
#24 /srv/mediawiki/php-1.46.0-wmf.22/extensions/Wikibase/data-access/src/ByTypeDispatchingEntityRevisionLookup.php(55): Wikibase\Lib\Store\TypeDispatchingEntityRevisionLookup->getEntityRevision(Wikibase\MediaInfo\DataModel\MediaInfoId, int, string)
#25 /srv/mediawiki/php-1.46.0-wmf.22/extensions/WikibaseMediaInfo/src/DataAccess/Store/EntityIdFixingRevisionLookup.php(40): Wikibase\DataAccess\ByTypeDispatchingEntityRevisionLookup->getEntityRevision(Wikibase\MediaInfo\DataModel\MediaInfoId, int, string)
#26 /srv/mediawiki/php-1.46.0-wmf.22/extensions/WikibaseMediaInfo/src/DataAccess/Store/FilePageRedirectHandlingRevisionLookup.php(43): Wikibase\MediaInfo\DataAccess\Store\EntityIdFixingRevisionLookup->getEntityRevision(Wikibase\MediaInfo\DataModel\MediaInfoId, int, string)
#27 /srv/mediawiki/php-1.46.0-wmf.22/extensions/Wikibase/lib/includes/Store/TypeDispatchingEntityRevisionLookup.php(51): Wikibase\MediaInfo\DataAccess\Store\FilePageRedirectHandlingRevisionLookup->getEntityRevision(Wikibase\MediaInfo\DataModel\MediaInfoId, int, string)
#28 /srv/mediawiki/php-1.46.0-wmf.22/extensions/Wikibase/lib/includes/Store/CachingEntityRevisionLookup.php(99): Wikibase\Lib\Store\TypeDispatchingEntityRevisionLookup->getEntityRevision(Wikibase\MediaInfo\DataModel\MediaInfoId, int, string)
#29 /srv/mediawiki/php-1.46.0-wmf.22/extensions/Wikibase/lib/includes/Store/CachingEntityRevisionLookup.php(85): Wikibase\Lib\Store\CachingEntityRevisionLookup->fetchEntityRevision(Wikibase\MediaInfo\DataModel\MediaInfoId, int, string)
#30 /srv/mediawiki/php-1.46.0-wmf.22/extensions/Wikibase/lib/includes/Store/CachingEntityRevisionLookup.php(99): Wikibase\Lib\Store\CachingEntityRevisionLookup->getEntityRevision(Wikibase\MediaInfo\DataModel\MediaInfoId, int, string)
#31 /srv/mediawiki/php-1.46.0-wmf.22/extensions/Wikibase/lib/includes/Store/CachingEntityRevisionLookup.php(85): Wikibase\Lib\Store\CachingEntityRevisionLookup->fetchEntityRevision(Wikibase\MediaInfo\DataModel\MediaInfoId, int, string)
#32 /srv/mediawiki/php-1.46.0-wmf.22/extensions/Wikibase/lib/includes/Store/RevisionBasedEntityLookup.php(46): Wikibase\Lib\Store\CachingEntityRevisionLookup->getEntityRevision(Wikibase\MediaInfo\DataModel\MediaInfoId, int, string)
#33 /srv/mediawiki/php-1.46.0-wmf.22/extensions/Wikibase/lib/packages/wikibase/data-model-services/src/Lookup/RedirectResolvingEntityLookup.php(51): Wikibase\Lib\Store\RevisionBasedEntityLookup->getEntity(Wikibase\MediaInfo\DataModel\MediaInfoId)
#34 /srv/mediawiki/php-1.46.0-wmf.22/extensions/WikibaseMediaInfo/src/MediaInfoHooks.php(200): Wikibase\DataModel\Services\Lookup\RedirectResolvingEntityLookup->getEntity(Wikibase\MediaInfo\DataModel\MediaInfoId)
#35 /srv/mediawiki/php-1.46.0-wmf.22/includes/HookContainer/HookContainer.php(135): Wikibase\MediaInfo\MediaInfoHooks->onBeforePageDisplay(MediaWiki\Output\OutputPage, MediaWiki\Skins\Vector\SkinVectorLegacy)
#36 /srv/mediawiki/php-1.46.0-wmf.22/includes/HookContainer/HookRunner.php(1022): MediaWiki\HookContainer\HookContainer->run(string, array, array)
#37 /srv/mediawiki/php-1.46.0-wmf.22/includes/Output/OutputPage.php(3306): MediaWiki\HookContainer\HookRunner->onBeforePageDisplay(MediaWiki\Output\OutputPage, MediaWiki\Skins\Vector\SkinVectorLegacy)
#38 /srv/mediawiki/php-1.46.0-wmf.22/includes/Actions/ActionEntryPoint.php(162): MediaWiki\Output\OutputPage->output(bool)
#39 /srv/mediawiki/php-1.46.0-wmf.22/includes/MediaWikiEntryPoint.php(180): MediaWiki\Actions\ActionEntryPoint->execute()
#40 /srv/mediawiki/php-1.46.0-wmf.22/index.php(44): MediaWiki\MediaWikiEntryPoint->run()
#41 /srv/mediawiki/w/index.php(3): require(string)
#42 {main}

Impact

Notes

Timing coincides with T422130. Coincidence?

Per “Database servers in cluster26 are overloaded. In order to protect application servers, the circuit breaking to databases of this section have” in the full exception message, I’m gonna conclude that’s the same issue as T422130: External store unreachable: "Database servers in clusterXX are overloaded".

Lucas_Werkmeister_WMDE closed this task as a duplicate of T422130: External store unreachable: "Database servers in clusterXX are overloaded".Apr 2 2026, 11:20 AM

Fatal exception of type "Wikibase\DataModel\Services\Lookup\EntityLookupException"Closed, DuplicatePublicPRODUCTION ERRORActions