PageSplitterHooks: Error: Call to a member function exists() on null
Closed, ResolvedPublicPRODUCTION ERROR
Actions

Description

Error

mwversion: 1.38.0-wmf.26
reqId: 2ae7730e-67c8-45e7-8eb0-f17894e13b7f
Find reqId in Logstash

normalized_message

[{reqId}] {exception_url}   Error: Call to a member function exists() on null

exception.trace

from /srv/mediawiki/php-1.38.0-wmf.26/extensions/WikimediaEvents/includes/PageSplitter/PageSplitterHooks.php(36)
#0 /srv/mediawiki/php-1.38.0-wmf.26/includes/HookContainer/HookContainer.php(160): WikimediaEvents\PageSplitter\PageSplitterHooks->onXAnalyticsSetHeader(OutputPage, array)
#1 /srv/mediawiki/php-1.38.0-wmf.26/includes/Hooks.php(137): MediaWiki\HookContainer\HookContainer->run(string, array, array)
#2 /srv/mediawiki/php-1.38.0-wmf.26/extensions/XAnalytics/includes/XAnalytics.php(53): Hooks::run(string, array)
#3 /srv/mediawiki/php-1.38.0-wmf.26/extensions/XAnalytics/includes/XAnalytics.php(79): MediaWiki\Extension\XAnalytics\XAnalytics::generateHeader(OutputPage)
#4 /srv/mediawiki/php-1.38.0-wmf.26/includes/HookContainer/HookContainer.php(338): MediaWiki\Extension\XAnalytics\XAnalytics::onAPIAfterExecute(Flow\Api\ApiFlow)
#5 /srv/mediawiki/php-1.38.0-wmf.26/includes/HookContainer/HookContainer.php(137): MediaWiki\HookContainer\HookContainer->callLegacyHook(string, array, array, array)
#6 /srv/mediawiki/php-1.38.0-wmf.26/includes/api/ApiHookRunner.php(66): MediaWiki\HookContainer\HookContainer->run(string, array)
#7 /srv/mediawiki/php-1.38.0-wmf.26/includes/api/ApiMain.php(1893): MediaWiki\Api\ApiHookRunner->onAPIAfterExecute(Flow\Api\ApiFlow)
#8 /srv/mediawiki/php-1.38.0-wmf.26/includes/api/ApiMain.php(839): ApiMain->executeAction()
#9 /srv/mediawiki/php-1.38.0-wmf.26/extensions/MassMessage/includes/Job/MassMessageJob.php(334): ApiMain->execute()
#10 /srv/mediawiki/php-1.38.0-wmf.26/extensions/MassMessage/includes/Job/MassMessageJob.php(285): MediaWiki\MassMessage\Job\MassMessageJob->makeAPIRequest(array, User)
#11 /srv/mediawiki/php-1.38.0-wmf.26/extensions/MassMessage/includes/Job/MassMessageJob.php(468): MediaWiki\MassMessage\Job\MassMessageJob->addFlowTopic(string, string)
#12 /srv/mediawiki/php-1.38.0-wmf.26/extensions/MassMessage/includes/Job/MassMessageJob.php(214): MediaWiki\MassMessage\Job\MassMessageJob->deliverMessage(Title, string, string, NULL, MediaWiki\MassMessage\LanguageAwareText, array)
#13 /srv/mediawiki/php-1.38.0-wmf.26/extensions/MassMessage/includes/Job/MassMessageJob.php(69): MediaWiki\MassMessage\Job\MassMessageJob->sendMessage()
#14 /srv/mediawiki/php-1.38.0-wmf.26/extensions/EventBus/includes/JobExecutor.php(79): MediaWiki\MassMessage\Job\MassMessageJob->run()
#15 /srv/mediawiki/rpc/RunSingleJob.php(76): MediaWiki\Extension\EventBus\JobExecutor->execute(array)
#16 {main}

Impact

Unclear.

Notes

Saw a spike of these in both 1.38.0-wmf.26 and 1.39.0-wmf.21 (T300203) around 15:14 UTC.

Details

Request URL: https://jobrunner.discovery.wmnet/rpc/RunSingleJob.php

Subject	Repo	Branch	Lines +/-
PageSplitter: check for OutputPage::getTitle() returning null	mediawiki/extensions/WikimediaEvents	master	+7 -4
PageSplitter: check for OutputPage::getTitle() returning null	mediawiki/extensions/WikimediaEvents	wmf/1.39.0-wmf.2	+7 -4
PageSplitter: check for OutputPage::getTitle() returning null	mediawiki/extensions/WikimediaEvents	wmf/1.39.0-wmf.1	+7 -4
PageSplitter: check for OutputPage::getTitle() returning null	mediawiki/extensions/WikimediaEvents	wmf/1.38.0-wmf.26	+7 -4
PageSplitter: OutputPage::getTitle() can return null	mediawiki/extensions/WikimediaEvents	master	+3 -2

Customize query in gerrit

Related Objects
Search...

Status	Subtype	Assigned	Task
Declined		None	T299133 [EPIC] A/B test section snippets
Resolved		Jdrewniak	T301584 Add rich snippet instrument to WikimediaEvents
Resolved	Release	thcipriani	T300203 🧪🚂 Trainsperiment Week: 1.39.0-wmf.1, 1.39.0-wmf.2, 1.39.0-wmf.3, 1.39.0-wmf.4 deployment blockers
Resolved	PRODUCTION ERROR	taavi	T304331 PageSplitterHooks: Error: Call to a member function exists() on null

Event Timeline

• brennen created this task.Mar 21 2022, 3:54 PM

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptMar 21 2022, 3:54 PM

• brennen moved this task from Backlog to Logs/Train on the User-brennen board.Mar 21 2022, 3:54 PM

Tentatively treating this as a train blocker - we didn't notice it last week and it's happening at a pretty high rate.

• brennen added a parent task: T300203: 🧪🚂 Trainsperiment Week: 1.39.0-wmf.1, 1.39.0-wmf.2, 1.39.0-wmf.3, 1.39.0-wmf.4 deployment blockers.Mar 21 2022, 4:11 PM

Zabe subscribed.Mar 21 2022, 4:13 PM

PageSplitterHooks was added recently (last Monday) for T301584 by @cjming.

Git blame has brought us to https://gerrit.wikimedia.org/r/c/mediawiki/extensions/WikimediaEvents/+/763469 and T301584: Add rich snippet instrument to WikimediaEvents, and it looks like others have mentioned this as well in engineering-all on Slack. cc @Jdlrobson and @cjming.

working on a patch

Change 772438 had a related patch set uploaded (by Phuedx; author: Phuedx):

[mediawiki/extensions/WikimediaEvents@master] PageSplitter: OutputPage::getTitle() can return null

https://gerrit.wikimedia.org/r/772438

gerritbot added a project: Patch-For-Review.Mar 21 2022, 4:32 PM

In T304331#7793554, @Majavah wrote:

working on a patch

Ah! My apologies @Majavah. I didn't see your comment before I created the patch.

Change 772439 had a related patch set uploaded (by Majavah; author: Majavah):

[mediawiki/extensions/WikimediaEvents@master] PageSplitter: check for OutputPage::getTitle() returning null

https://gerrit.wikimedia.org/r/772439

In T304331#7793569, @phuedx wrote:

In T304331#7793554, @Majavah wrote:

working on a patch

Ah! My apologies @Majavah. I didn't see your comment before I created the patch.

No worries! I uploaded mine anyway since it fixes both places with the same issue and not just that one.

Change 772438 abandoned by Phuedx:

[mediawiki/extensions/WikimediaEvents@master] PageSplitter: OutputPage::getTitle() can return null

Reason:

See I601230c32f3fbbb2f5019ba3da7ef7baefbf9e87

https://gerrit.wikimedia.org/r/772438

Change 772363 had a related patch set uploaded (by Majavah; author: Majavah):

[mediawiki/extensions/WikimediaEvents@wmf/1.38.0-wmf.26] PageSplitter: check for OutputPage::getTitle() returning null

https://gerrit.wikimedia.org/r/772363

Change 772364 had a related patch set uploaded (by Majavah; author: Majavah):

[mediawiki/extensions/WikimediaEvents@wmf/1.39.0-wmf.1] PageSplitter: check for OutputPage::getTitle() returning null

https://gerrit.wikimedia.org/r/772364

Change 772365 had a related patch set uploaded (by Majavah; author: Majavah):

[mediawiki/extensions/WikimediaEvents@wmf/1.39.0-wmf.2] PageSplitter: check for OutputPage::getTitle() returning null

https://gerrit.wikimedia.org/r/772365

Change 772439 merged by jenkins-bot:

[mediawiki/extensions/WikimediaEvents@master] PageSplitter: check for OutputPage::getTitle() returning null

https://gerrit.wikimedia.org/r/772439

Jdlrobson removed taavi as the assignee of this task.Mar 21 2022, 4:48 PM

Jdlrobson assigned this task to taavi.

Jdlrobson added a project: Web-Team-Backlog (Kanbanana-FY-2021-22).

Jdlrobson moved this task from Needs Analysis to Code Review on the Web-Team-Backlog (Kanbanana-FY-2021-22) board.

Change 772363 merged by jenkins-bot:

[mediawiki/extensions/WikimediaEvents@wmf/1.38.0-wmf.26] PageSplitter: check for OutputPage::getTitle() returning null

https://gerrit.wikimedia.org/r/772363

Change 772364 merged by jenkins-bot:

[mediawiki/extensions/WikimediaEvents@wmf/1.39.0-wmf.1] PageSplitter: check for OutputPage::getTitle() returning null

https://gerrit.wikimedia.org/r/772364

Change 772365 merged by jenkins-bot:

[mediawiki/extensions/WikimediaEvents@wmf/1.39.0-wmf.2] PageSplitter: check for OutputPage::getTitle() returning null

https://gerrit.wikimedia.org/r/772365

Mentioned in SAL (#wikimedia-operations) [2022-03-21T16:53:44Z] <taavi@deploy1002> Synchronized php-1.38.0-wmf.26/extensions/WikimediaEvents/includes/PageSplitter/PageSplitterHooks.php: Backport: [[gerrit:772363|PageSplitter: check for OutputPage::getTitle() returning null (T304331)]] (duration: 00m 51s)

Mentioned in SAL (#wikimedia-operations) [2022-03-21T16:55:43Z] <taavi@deploy1002> Synchronized php-1.39.0-wmf.1/extensions/WikimediaEvents/includes/PageSplitter/PageSplitterHooks.php: Backport: [[gerrit:772364|PageSplitter: check for OutputPage::getTitle() returning null (T304331)]] (duration: 00m 50s)