Closed, ResolvedPublicPRODUCTION ERROR
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Description

There are two similar errors, including them both here:

Error

service.version: 1.47.0-wmf.2
timestamp: 2026-05-12T08:34:31.775Z
labels.phpversion: 8.3.30
trace.id: 021edf59-cd56-4cfb-80e5-84f3acf660ee
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labels.normalized_message

[{reqId}] {exception_url}   ArgumentCountError: Too few arguments to function MediaWiki\Extension\EventBus\Serializers\MediaWiki\UserEntitySerializer::__construct(), 3 passed in /srv/mediawiki/php-1.47.0-wmf.2/extensions/WikimediaEvents/includes/IPReputationHooks.php on line 150 and exactly 4 expected

[{reqId}] {exception_url}   ArgumentCountError: Too few arguments to function MediaWiki\Extension\EventBus\Serializers\MediaWiki\UserEntitySerializer::__construct(), 3 passed in /srv/mediawiki/php-1.47.0-wmf.2/extensions/WikimediaEvents/includes/EditPage/CaptchaScoreHooks.php on line 321 and exactly 4 expected

Frame	Location	Call
from	/srv/mediawiki/php-1.47.0-wmf.2/extensions/EventBus/includes/Serializers/MediaWiki/UserEntitySerializer.php(61)
#0	/srv/mediawiki/php-1.47.0-wmf.2/extensions/WikimediaEvents/includes/IPReputationHooks.php(150)	MediaWiki\Extension\EventBus\Serializers\MediaWiki\UserEntitySerializer->__construct(MediaWiki\User\UserFactory, MediaWiki\User\UserGroupManager, MediaWiki\Extension\CentralAuth\User\CentralAuthIdLookup)
#1	/srv/mediawiki/php-1.47.0-wmf.2/extensions/WikimediaEvents/includes/IPReputationHooks.php(70)	WikimediaEvents\IPReputationHooks->recordEvent(string, string, MediaWiki\User\User, int)
#2	/srv/mediawiki/php-1.47.0-wmf.2/includes/Deferred/MWCallableUpdate.php(52)	WikimediaEvents\IPReputationHooks->WikimediaEvents\{closure}(string)
#3	/srv/mediawiki/php-1.47.0-wmf.2/includes/Deferred/DeferredUpdates.php(448)	MediaWiki\Deferred\MWCallableUpdate->doUpdate()
#4	/srv/mediawiki/php-1.47.0-wmf.2/includes/Deferred/DeferredUpdates.php(187)	MediaWiki\Deferred\DeferredUpdates::attemptUpdate(MediaWiki\Deferred\MWCallableUpdate)
#5	/srv/mediawiki/php-1.47.0-wmf.2/includes/Deferred/DeferredUpdates.php(277)	MediaWiki\Deferred\DeferredUpdates::run(MediaWiki\Deferred\MWCallableUpdate)
#6	/srv/mediawiki/php-1.47.0-wmf.2/includes/Deferred/DeferredUpdatesScope.php(229)	MediaWiki\Deferred\DeferredUpdates::MediaWiki\Deferred\{closure}(MediaWiki\Deferred\MWCallableUpdate, int)
#7	/srv/mediawiki/php-1.47.0-wmf.2/includes/Deferred/DeferredUpdatesScope.php(158)	MediaWiki\Deferred\DeferredUpdatesScope->processStageQueue(int, int, Closure)
#8	/srv/mediawiki/php-1.47.0-wmf.2/includes/Deferred/DeferredUpdates.php(271)	MediaWiki\Deferred\DeferredUpdatesScope->processUpdates(int, Closure)
#9	/srv/mediawiki/php-1.47.0-wmf.2/includes/MediaWikiEntryPoint.php(652)	MediaWiki\Deferred\DeferredUpdates::doUpdates()
#10	/srv/mediawiki/php-1.47.0-wmf.2/includes/MediaWikiEntryPoint.php(474)	MediaWiki\MediaWikiEntryPoint->restInPeace()
#11	/srv/mediawiki/php-1.47.0-wmf.2/includes/MediaWikiEntryPoint.php(432)	MediaWiki\MediaWikiEntryPoint->doPostOutputShutdown()
#12	/srv/mediawiki/php-1.47.0-wmf.2/includes/MediaWikiEntryPoint.php(189)	MediaWiki\MediaWikiEntryPoint->postOutputShutdown()
#13	/srv/mediawiki/php-1.47.0-wmf.2/index.php(44)	MediaWiki\MediaWikiEntryPoint->run()
#14	/srv/mediawiki/w/index.php(3)	require(string)
#15	{main}

Impact

Notes

See similar T425801 about CheckUser.

Details

MediaWiki Version: 1.47.0-wmf.2
Request URL: https://www.mediawiki.org/wiki/Special:CentralAutoLogin/setCookies?type=*&useformat=*&usesul3=*

Related Changes in Gerrit:

	Subject	Repo	Branch	Lines +/-
	Use EventBus.UserEntitySerialize Service	mediawiki/extensions/WikimediaEvents	master	+21 -121
	Update UserEntitySerializer callers	mediawiki/extensions/WikimediaEvents	wmf/1.47.0-wmf.2	+44 -18

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Related Objects
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		Status	Subtype	Assigned	Task
		Resolved	Release	Aklapper	T423911 1.47.0-wmf.2 deployment blockers
		Resolved	PRODUCTION ERROR	kostajh	T426026 ArgumentCountError: Too few arguments to function MediaWiki\Extension\EventBus\Serializers\MediaWiki\UserEntitySerializer::__construct(), 3 passed in /srv/mediawiki/php-1.47.0-wmf.2/extensions/WikimediaEvents/

Event Timeline

Aklapper created this task.May 12 2026, 8:46 AM

I have seen this fairly reliably when editing (on desktop and mobile VE and SE), either when doing an edit which triggers addurl or AbuseFilter or a normal edit which triggers an hCaptcha challenge.

In the former case, I see the exception before the hCaptcha challenge shows. In the latter, I see the exception after completing the challenge.

This was caused by T392516. Product Safety and Integrity can provide code review as needed

Making a train blocker as it breaks instrumentation

This needs https://gerrit.wikimedia.org/r/c/mediawiki/extensions/WikimediaEvents/+/1286281 backported to wmf.2, I think (cc @Reedy)

Change #1286295 had a related patch set uploaded (by Kosta Harlan; author: Reedy):

[mediawiki/extensions/WikimediaEvents@wmf/1.47.0-wmf.2] Update UserEntitySerializer callers

https://gerrit.wikimedia.org/r/1286295

gerritbot added a project: Patch-For-Review.May 12 2026, 9:43 AM

Change #1286295 merged by jenkins-bot:

[mediawiki/extensions/WikimediaEvents@wmf/1.47.0-wmf.2] Update UserEntitySerializer callers

https://gerrit.wikimedia.org/r/1286295

Mentioned in SAL (#wikimedia-operations) [2026-05-12T09:48:28Z] <kharlan@deploy1003> Started scap sync-world: Backport for [[gerrit:1286295|Update UserEntitySerializer callers (T426026)]]

Mentioned in SAL (#wikimedia-operations) [2026-05-12T09:50:21Z] <kharlan@deploy1003> kharlan: Backport for [[gerrit:1286295|Update UserEntitySerializer callers (T426026)]] synced to the testservers (see https://wikitech.wikimedia.org/wiki/Mwdebug). Changes can now be verified there.

kostajh claimed this task.May 12 2026, 9:53 AM

Mentioned in SAL (#wikimedia-operations) [2026-05-12T09:56:11Z] <kharlan@deploy1003> Finished scap sync-world: Backport for [[gerrit:1286295|Update UserEntitySerializer callers (T426026)]] (duration: 07m 43s)

kostajh closed this task as Resolved.May 12 2026, 9:59 AM

Thanks for the quick handling!

ReleaseTaggerBot added a project: MW-1.47-notes (1.47.0-wmf.2; 2026-05-12).May 12 2026, 10:00 AM

Maintenance_bot removed a project: Patch-For-Review.May 12 2026, 10:31 AM

@kostajh thanks!

In T392516: [EventBus] Stabilize EventSerializer and related classes we added an EventBus.UserEntitySerializer MW service. Could you inject that into your code instead of constructing a new one?

In T426026#11913728, @Ottomata wrote:

@kostajh thanks!

In T392516: [EventBus] Stabilize EventSerializer and related classes we added an EventBus.UserEntitySerializer MW service. Could you inject that into your code instead of constructing a new one?

Patches welcome! But the point for UBN fixes is to get prod un-broken.

Okay thanks.

We recently did T392516 and did a manual rollout and migration for CirrusSearch. I don't know why I did not catch these other usages via CodeSearch.

I filed T425801: CheckUser extension should use EventBus.UserEntitySerializer service instead of constructor in response to https://integration.wikimedia.org/ci/job/quibble-with-gated-extensions-vendor-mysql-php83/33193/console.

Why didn't this WikimediaEvents error show up in quibble-with-gated-extensions CI too?

Why didn't this WikimediaEvents error show up in quibble-with-gated-extensions CI too?

Because WikimediaEvents isn't in the list of gated extensions, so it's tests are not run in quibble-with-gated-extensions

Change #1286947 had a related patch set uploaded (by Ottomata; author: Ottomata):

[mediawiki/extensions/WikimediaEvents@master] Use EventBus.UserEntitySerialize Service

https://gerrit.wikimedia.org/r/1286947

gerritbot added a project: Patch-For-Review.May 13 2026, 2:16 PM

Ack, ty.

Submitted Use EventBus.UserEntitySerialize Service (1286947)

Change #1286947 merged by jenkins-bot: