CheckUser: Some private log entries appear to be missing title and page ID, causing exceptions
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Authored By

	Dreamy_Jazz
	Mar 24 2026, 10:47 AM

Project Tags

Referenced Files

None

Subscribers

Aklapper

Arendpieter

Dreamy_Jazz

Description

Summary

It seems that some rows in cu_private_event are not being parsed correctly (or were stored incorrectly) such that there is no valid title found, which causes an exception when the title is accessed

Technical details

All such logs

An example log:

normalized_message

[{reqId}] {exception_url}   Error: Typed property MediaWiki\Logging\ManualLogEntry::$targetPage must not be accessed before initialization

exception.message

from /srv/mediawiki/php-1.46.0-wmf.20/includes/Logging/ManualLogEntry.php(520)
#0 /srv/mediawiki/php-1.46.0-wmf.20/includes/Logging/LogFormatter.php(668): MediaWiki\Logging\ManualLogEntry->getTarget()
#1 /srv/mediawiki/php-1.46.0-wmf.20/extensions/CheckUser/src/Logging/CheckUserPrivateEventLogFormatter.php(32): MediaWiki\Logging\LogFormatter->getMessageParameters()
#2 /srv/mediawiki/php-1.46.0-wmf.20/includes/Logging/LogFormatter.php(568): MediaWiki\Extension\CheckUser\Logging\CheckUserPrivateEventLogFormatter->getMessageParameters()
#3 /srv/mediawiki/php-1.46.0-wmf.20/extensions/CheckUser/src/Logging/CheckUserPrivateEventLogFormatter.php(89): MediaWiki\Logging\LogFormatter->getActionMessage()
#4 /srv/mediawiki/php-1.46.0-wmf.20/includes/Logging/LogFormatter.php(543): MediaWiki\Extension\CheckUser\Logging\CheckUserPrivateEventLogFormatter->getActionMessage()
#5 /srv/mediawiki/php-1.46.0-wmf.20/extensions/CheckUser/src/CheckUser/Pagers/CheckUserGetActionsPager.php(268): MediaWiki\Logging\LogFormatter->getActionText()
#6 /srv/mediawiki/php-1.46.0-wmf.20/extensions/CheckUser/src/CheckUser/Pagers/CheckUserGetActionsPager.php(193): MediaWiki\Extension\CheckUser\CheckUser\Pagers\CheckUserGetActionsPager->getActionText(MediaWiki\Logging\ManualLogEntry)
#7 /srv/mediawiki/php-1.46.0-wmf.20/includes/Pager/ReverseChronologicalPager.php(117): MediaWiki\Extension\CheckUser\CheckUser\Pagers\CheckUserGetActionsPager->formatRow(stdClass)
#8 /srv/mediawiki/php-1.46.0-wmf.20/includes/Pager/IndexPager.php(619): MediaWiki\Pager\ReverseChronologicalPager->getRow(stdClass)
#9 /srv/mediawiki/php-1.46.0-wmf.20/extensions/CheckUser/src/CheckUser/SpecialCheckUser.php(283): MediaWiki\Pager\IndexPager->getBody()
#10 /srv/mediawiki/php-1.46.0-wmf.20/includes/SpecialPage/SpecialPage.php(711): MediaWiki\Extension\CheckUser\CheckUser\SpecialCheckUser->execute(null)
#11 /srv/mediawiki/php-1.46.0-wmf.20/includes/SpecialPage/SpecialPageFactory.php(1712): MediaWiki\SpecialPage\SpecialPage->run(null)
#12 /srv/mediawiki/php-1.46.0-wmf.20/includes/Actions/ActionEntryPoint.php(504): MediaWiki\SpecialPage\SpecialPageFactory->executePath(string, MediaWiki\Context\RequestContext)
#13 /srv/mediawiki/php-1.46.0-wmf.20/includes/Actions/ActionEntryPoint.php(144): MediaWiki\Actions\ActionEntryPoint->performRequest()
#14 /srv/mediawiki/php-1.46.0-wmf.20/includes/MediaWikiEntryPoint.php(180): MediaWiki\Actions\ActionEntryPoint->execute()
#15 /srv/mediawiki/php-1.46.0-wmf.20/index.php(44): MediaWiki\MediaWikiEntryPoint->run()
#16 /srv/mediawiki/w/index.php(3): require(string)
#17 {main}

Acceptance criteria

The cause of the logstash errors is determined and fixed

Details

Related Changes in Gerrit:

	Subject	Repo	Branch	Lines +/-
	CheckUserLookupUtils: Log when missing target for log entry	mediawiki/extensions/CheckUser	master	+29 -11
	Fix exception when cu_private_event rows have no valid title or page ID	mediawiki/extensions/CheckUser	master	+69 -7

Customize query in gerrit

Event Timeline

Dreamy_Jazz created this task.Mar 24 2026, 10:47 AM

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptMar 24 2026, 10:47 AM

Dreamy_Jazz moved this task from Inbox to Later sprints on the Product Safety and Integrity board.Mar 30 2026, 11:28 AM

Dreamy_Jazz moved this task from Later sprints to Next sprint on the Product Safety and Integrity board.

Change #1264642 had a related patch set uploaded (by Arendpieter; author: Arendpieter):

[mediawiki/extensions/CheckUser@master] Fix exception when cu_private_event rows have no valid title or page ID

https://gerrit.wikimedia.org/r/1264642

gerritbot added a project: Patch-For-Review.Mar 30 2026, 1:58 PM

Arendpieter subscribed.Mar 30 2026, 1:59 PM

Dreamy_Jazz assigned this task to Arendpieter.Apr 16 2026, 11:26 AM

Dreamy_Jazz edited projects, added: Product Safety and Integrity (Sprint Tulip (Apr 13 - May 1)); removed: Product Safety and Integrity.

Dreamy_Jazz moved this task from Backlog to Needs review on the Product Safety and Integrity (Sprint Tulip (Apr 13 - May 1)) board.

Change #1264642 merged by jenkins-bot:

[mediawiki/extensions/CheckUser@master] Fix exception when cu_private_event rows have no valid title or page ID

https://gerrit.wikimedia.org/r/1264642

Change #1272675 had a related patch set uploaded (by Dreamy Jazz; author: Dreamy Jazz):

[mediawiki/extensions/CheckUser@master] CheckUserLookupUtils: Log when Badtitle used for log entry

https://gerrit.wikimedia.org/r/1272675

ReleaseTaggerBot added a project: MW-1.46-notes (1.46.0-wmf.26; 2026-04-28).Apr 16 2026, 12:01 PM

Change #1272675 merged by jenkins-bot:

[mediawiki/extensions/CheckUser@master] CheckUserLookupUtils: Log when missing target for log entry

https://gerrit.wikimedia.org/r/1272675

Maintenance_bot removed a project: Patch-For-Review.Apr 17 2026, 8:30 AM

The fix from @Arendpieter and my follow up to add logging should address this issue for now. If the error appears in the logs, we can investigate each instance in a new ticket

Thanks for the fix!

Dreamy_Jazz moved this task from Needs review to Done on the Product Safety and Integrity (Sprint Tulip (Apr 13 - May 1)) board.Apr 17 2026, 8:53 AM

CheckUser: Some private log entries appear to be missing title and page ID, causing exceptionsClosed, ResolvedPublicActions