DivisionByZeroError: Division by zero (in ComputedUserImpactLookup)
Closed, ResolvedPublicPRODUCTION ERROR
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	Etonkovidova
	Jan 5 2026, 7:10 PM

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Description

Error

mwversion: 1.46.0-wmf.7
timestamp: 2026-01-04T22:47:17.773Z
phpversion: 8.3.28
reqId: 4018fecf-5b1b-4b7b-bace-1554d4383380
Find reqId in Logstash

normalized_message

[{reqId}] {exception_url}   DivisionByZeroError: Division by zero

Frame	Location	Call
from	/srv/mediawiki/php-1.46.0-wmf.7/extensions/GrowthExperiments/includes/UserImpact/ComputedUserImpactLookup.php(651)
#0	/srv/mediawiki/php-1.46.0-wmf.7/extensions/GrowthExperiments/includes/UserImpact/ComputedUserImpactLookup.php(511)	GrowthExperiments\UserImpact\ComputedUserImpactLookup->getImage(MediaWiki\Title\Title)
#1	/srv/mediawiki/php-1.46.0-wmf.7/extensions/GrowthExperiments/includes/UserImpact/ComputedUserImpactLookup.php(180)	GrowthExperiments\UserImpact\ComputedUserImpactLookup->getPageViewData(MediaWiki\User\User, array, array, array)
#2	/srv/mediawiki/php-1.46.0-wmf.7/extensions/GrowthExperiments/includes/UserImpact/GrowthExperimentsUserImpactUpdater.php(98)	GrowthExperiments\UserImpact\ComputedUserImpactLookup->getExpensiveUserImpact(MediaWiki\User\User, int, array)
#3	/srv/mediawiki/php-1.46.0-wmf.7/extensions/GrowthExperiments/includes/UserImpact/MediaWikiEventIngress/PageRevisionUpdatedIngress.php(29)	GrowthExperiments\UserImpact\GrowthExperimentsUserImpactUpdater->refreshUserImpactData(MediaWiki\User\User)
#4	/srv/mediawiki/php-1.46.0-wmf.7/includes/DomainEvent/EventDispatchEngine.php(205)	GrowthExperiments\UserImpact\MediaWikiEventIngress\PageRevisionUpdatedIngress->handlePageRevisionUpdatedEvent(MediaWiki\Page\Event\PageLatestRevisionChangedEvent)
#5	/srv/mediawiki/php-1.46.0-wmf.7/includes/DomainEvent/EventDispatchEngine.php(194)	MediaWiki\DomainEvent\EventDispatchEngine->invoke(array, MediaWiki\Page\Event\PageLatestRevisionChangedEvent)
#6	/srv/mediawiki/php-1.46.0-wmf.7/includes/Deferred/MWCallableUpdate.php(52)	MediaWiki\DomainEvent\EventDispatchEngine->MediaWiki\DomainEvent\{closure}(string)
#7	/srv/mediawiki/php-1.46.0-wmf.7/includes/Deferred/DeferredUpdates.php(445)	MediaWiki\Deferred\MWCallableUpdate->doUpdate()
#8	/srv/mediawiki/php-1.46.0-wmf.7/includes/Deferred/DeferredUpdates.php(187)	MediaWiki\Deferred\DeferredUpdates::attemptUpdate(MediaWiki\Deferred\MWCallableUpdate)
#9	/srv/mediawiki/php-1.46.0-wmf.7/includes/Deferred/DeferredUpdates.php(274)	MediaWiki\Deferred\DeferredUpdates::run(MediaWiki\Deferred\MWCallableUpdate)
#10	/srv/mediawiki/php-1.46.0-wmf.7/includes/Deferred/DeferredUpdatesScope.php(229)	MediaWiki\Deferred\DeferredUpdates::MediaWiki\Deferred\{closure}(MediaWiki\Deferred\MWCallableUpdate, int)
#11	/srv/mediawiki/php-1.46.0-wmf.7/includes/Deferred/DeferredUpdatesScope.php(158)	MediaWiki\Deferred\DeferredUpdatesScope->processStageQueue(int, int, Closure)
#12	/srv/mediawiki/php-1.46.0-wmf.7/includes/Deferred/DeferredUpdates.php(268)	MediaWiki\Deferred\DeferredUpdatesScope->processUpdates(int, Closure)
#13	/srv/mediawiki/php-1.46.0-wmf.7/includes/MediaWikiEntryPoint.php(653)	MediaWiki\Deferred\DeferredUpdates::doUpdates()
#14	/srv/mediawiki/php-1.46.0-wmf.7/includes/MediaWikiEntryPoint.php(475)	MediaWiki\MediaWikiEntryPoint->restInPeace()
#15	/srv/mediawiki/php-1.46.0-wmf.7/includes/MediaWikiEntryPoint.php(433)	MediaWiki\MediaWikiEntryPoint->doPostOutputShutdown()
#16	/srv/mediawiki/php-1.46.0-wmf.7/includes/MediaWikiEntryPoint.php(190)	MediaWiki\MediaWikiEntryPoint->postOutputShutdown()
#17	/srv/mediawiki/php-1.46.0-wmf.7/index.php(44)	MediaWiki\MediaWikiEntryPoint->run()
#18	/srv/mediawiki/w/index.php(3)	require(string)
#19	{main}

Impact

started on 2025-12-30 https://logstash.wikimedia.org/goto/2170bbf6e6d3e6222178232c2308a439
59 errors reported
all errors reported on nlwiki only

Notes

Details

Request URL: https://nl.wikipedia.org/w/index.php?action=rollback&from=*&title=*&token=*

Related Changes in Gerrit:

	Subject	Author	Repo	Branch	Lines +/-
	ComputedUserImpactLookup: handle 0 height gracefully	Sergio Gimeno	mediawiki/extensions/GrowthExperiments	master	+16 -5

Customize query in gerrit

Related Objects

Mentioned In: T398500: [timebox: 3 days] Impact module: Support larger wgGEUserImpactMaxEdits

Event Timeline

Etonkovidova created this task.Jan 5 2026, 7:10 PM

Restricted Application added a project: Growth-Team. · View Herald TranscriptJan 5 2026, 7:11 PM

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

Pppery renamed this task from DivisionByZeroError: Division by zero to DivisionByZeroError: Division by zero (in ComputedUserImpactLookup).Jan 5 2026, 7:21 PM

Etonkovidova mentioned this in T398500: [timebox: 3 days] Impact module: Support larger wgGEUserImpactMaxEdits.Jan 5 2026, 9:51 PM

Sgs moved this task from Inbox to Product Backlog on the Growth-Team board.Jan 8 2026, 11:55 AM

Change #1224939 had a related patch set uploaded (by Sergio Gimeno; author: Sergio Gimeno):

[mediawiki/extensions/GrowthExperiments@master] ComputedUserImpactLookup: handle 0 height gracefully

https://gerrit.wikimedia.org/r/1224939

gerritbot added a project: Patch-For-Review.Jan 9 2026, 12:55 PM

It seems a transient error in nlwiki, not idea how page images ended returning images with a 0 height. I've submitted a patch to use the default thumbnail size in this cases and try to generate the thumb URL anyways. Hope that makes sense. We could also add a warning for monitoring if this happens again although it seems quite uncommon.

Sgs moved this task from Incoming to Code Review on the Growth-Team (FY2025-26 Q2 Sprint 6) board.Jan 9 2026, 1:02 PM

KStoller-WMF edited projects, added: Growth-Team (FY2025-26 Q3 Sprint 1); removed: Growth-Team (FY2025-26 Q2 Sprint 6).Jan 13 2026, 7:53 PM

KStoller-WMF moved this task from Incoming to Code Review on the Growth-Team (FY2025-26 Q3 Sprint 1) board.

Change #1224939 merged by jenkins-bot:

[mediawiki/extensions/GrowthExperiments@master] ComputedUserImpactLookup: handle 0 height gracefully

https://gerrit.wikimedia.org/r/1224939

Maintenance_bot removed a project: Patch-For-Review.Jan 15 2026, 4:31 PM

• thcipriani moved this task from Untriaged to Jan–Mar 2026 on the Wikimedia-production-error board.Jan 15 2026, 5:51 PM

Sgs moved this task from Code Review to QA on the Growth-Team (FY2025-26 Q3 Sprint 1) board.Jan 16 2026, 3:09 PM

Etonkovidova moved this task from QA to Test in Production on the Growth-Team (FY2025-26 Q3 Sprint 1) board.Jan 16 2026, 7:43 PM