Undefined 'subtitle' and 'title' indexes in CollectionPageTemplate.php
Closed, ResolvedPublicPRODUCTION ERROR
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Description

Notice: Undefined index: subtitle in /srv/mediawiki/php-1.31.0-wmf.24/extensions/Collection/templates/CollectionPageTemplate.php on line 66
Notice: Undefined index: title in /srv/mediawiki/php-1.31.0-wmf.24/extensions/Collection/templates/CollectionPageTemplate.php on line 65

Details

Subject	Repo	Branch	Lines +/-
Provide undefined index free access to collection	mediawiki/extensions/Collection	master	+29 -8
Provide undefined index free access to collection	mediawiki/extensions/Collection	wmf/1.32.0-wmf.15	+29 -8
Fix undefined index warnings	mediawiki/extensions/Collection	master	+4 -3

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		Status	Subtype	Assigned	Task
		Resolved	Release	• mmodell	T191061 1.32.0-wmf.15 deployment blockers
		Resolved	PRODUCTION ERROR	• mmodell	T189636 Undefined 'subtitle' and 'title' indexes in CollectionPageTemplate.php

Event Timeline

Reedy created this task.Mar 14 2018, 12:03 AM

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptMar 14 2018, 12:03 AM

I think CollectionSession::getCollection() is returning a bogus empty collection.

This is the #1 Wikimedia-production-error logspam offender currently.

Maybe related:

Notice: Undefined index: items in /srv/mediawiki/php-1.31.0-wmf.28/extensions/Collection/CollectionProposals.php on line 134
Notice: Undefined index: items in /srv/mediawiki/php-1.31.0-wmf.28/extensions/Collection/templates/CollectionSuggestTemplate.php on line 102

Change 434432 had a related patch set uploaded (by MaxSem; owner: MaxSem):
[mediawiki/extensions/Collection@master] Fix undefined index warnings

https://gerrit.wikimedia.org/r/434432

gerritbot added a project: Patch-For-Review.May 22 2018, 12:01 AM

Change 434432 merged by jenkins-bot:
[mediawiki/extensions/Collection@master] Fix undefined index warnings

https://gerrit.wikimedia.org/r/434432

ReleaseTaggerBot added a project: MW-1.32-notes (WMF-deploy-2018-05-29 (1.32.0-wmf.6)).May 23 2018, 6:01 AM

Apparently that didn't get them all, because it's still happening and is now one of the most common messages in the type:mediawiki channel:error log.

Actually caused a deployment to be automatically aborted by scap because a random spike of in traffic triggering the issue during the time of the deployment (otherwise unrelated).

Notice: Undefined index: subtitle in /srv/mediawiki/php-1.32.0-wmf.10/extensions/Collection/templates/CollectionPageTemplate.php on line 66
Notice: Undefined index: title in /srv/mediawiki/php-1.32.0-wmf.10/extensions/Collection/templates/CollectionPageTemplate.php on line 65

Krinkle mentioned this in T182026: Notice: Undefined index: collection_id|writer|is_cached.Jul 11 2018, 2:00 AM

Not sure which team is the guardian for Collection, but based on last 12 months of commits and Proton development, assuming Reading-Web.

This is still the most active PHP error at the moment, and as such, any error less frequent than this one, is hard to detect and thus is allowing us to regress over time.

Krinkle lowered the priority of this task from High to Medium.Jul 31 2018, 6:36 PM

Per https://m.mediawiki.org/wiki/Developers/Maintainers no team is officially supporting it. It's not reading web.

Given how common error is, I'll write a patch today though as I've got some familiarity with this code from the proton work however I'll need help reviewing it.

Change 449644 had a related patch set uploaded (by Jdlrobson; owner: Jdlrobson):
[mediawiki/extensions/Collection@master] Provide undefined index free access to collection

https://gerrit.wikimedia.org/r/449644

gerritbot added a project: Patch-For-Review.Aug 1 2018, 3:25 AM

@Jdlrobson: thanks for the patch! I'll gladly review it and get it merged with the train tomorrow.

• mmodell added a parent task: T191061: 1.32.0-wmf.15 deployment blockers.Aug 1 2018, 3:28 AM

No problem. Consider merging https://gerrit.wikimedia.org/r/395115 (T189636) at same time to resolve similar problems! It's been open for almost a year now :)

Change 449796 had a related patch set uploaded (by 20after4; owner: Jdlrobson):
[mediawiki/extensions/Collection@wmf/1.32.0-wmf.15] Provide undefined index free access to collection

https://gerrit.wikimedia.org/r/449796

Change 449796 merged by jenkins-bot:
[mediawiki/extensions/Collection@wmf/1.32.0-wmf.15] Provide undefined index free access to collection

https://gerrit.wikimedia.org/r/449796

Mentioned in SAL (#wikimedia-operations) [2018-08-01T19:53:05Z] <twentyafterfour@deploy1001> Synchronized php-1.32.0-wmf.15/extensions/Collection/: Sync Change: https://gerrit.wikimedia.org/r/449796 Bug: T189636 unblocks: T191061 (duration: 00m 57s)