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Maniphest T402548

PHP Warning: DOMNode::appendChild(): Document Fragment is empty
Closed, ResolvedPublicPRODUCTION ERROR
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Description

Error
  • mwversion: 1.45.0-wmf.15
  • timestamp: 2025-08-21T11:11:23.411Z
  • phpversion: 8.1.33
  • reqId: acb7d736-850c-4de9-b48e-70ca3adfaab7
  • Find reqId in Logstash
normalized_message
[{reqId}] {exception_url}   PHP Warning: DOMNode::appendChild(): Document Fragment is empty
FrameLocationCall
from/srv/mediawiki/php-1.45.0-wmf.15/extensions/Kartographer/includes/Tag/ParsoidMapFrame.php(106)
#0[internal function]MediaWiki\Exception\MWExceptionHandler::handleError(int, string, string, int)
#1/srv/mediawiki/php-1.45.0-wmf.15/extensions/Kartographer/includes/Tag/ParsoidMapFrame.php(106)DOMNode->appendChild(Wikimedia\Parsoid\DOM\DocumentFragment)
#2/srv/mediawiki/php-1.45.0-wmf.15/vendor/wikimedia/parsoid/src/Wt2Html/TT/ExtensionHandler.php(123)Kartographer\Tag\ParsoidMapFrame->sourceToDom(Wikimedia\Parsoid\Ext\ParsoidExtensionAPI, string, array)
#3/srv/mediawiki/php-1.45.0-wmf.15/vendor/wikimedia/parsoid/src/Wt2Html/TT/ExtensionHandler.php(282)Wikimedia\Parsoid\Wt2Html\TT\ExtensionHandler->onExtension(Wikimedia\Parsoid\Tokens\SelfclosingTagTk)
#4/srv/mediawiki/php-1.45.0-wmf.15/vendor/wikimedia/parsoid/src/Wt2Html/TT/XMLTagBasedHandler.php(47)Wikimedia\Parsoid\Wt2Html\TT\ExtensionHandler->onTag(Wikimedia\Parsoid\Tokens\SelfclosingTagTk)
#5/srv/mediawiki/php-1.45.0-wmf.15/vendor/wikimedia/parsoid/src/Wt2Html/TokenHandlerPipeline.php(129)Wikimedia\Parsoid\Wt2Html\TT\XMLTagBasedHandler->process(array)
#6/srv/mediawiki/php-1.45.0-wmf.15/vendor/wikimedia/parsoid/src/Wt2Html/TokenHandlerPipeline.php(183)Wikimedia\Parsoid\Wt2Html\TokenHandlerPipeline->processChunk(array)
#7/srv/mediawiki/php-1.45.0-wmf.15/vendor/wikimedia/parsoid/src/Wt2Html/ParserPipeline.php(127)Wikimedia\Parsoid\Wt2Html\TokenHandlerPipeline->process(array, array)
#8/srv/mediawiki/php-1.45.0-wmf.15/vendor/wikimedia/parsoid/src/Utils/PipelineUtils.php(137)Wikimedia\Parsoid\Wt2Html\ParserPipeline->parse(string, array)
#9/srv/mediawiki/php-1.45.0-wmf.15/vendor/wikimedia/parsoid/src/Utils/PipelineUtils.php(222)Wikimedia\Parsoid\Utils\PipelineUtils::processContentInPipeline(Wikimedia\Parsoid\Config\Env, Wikimedia\Parsoid\Wt2Html\PageConfigFrame, string, array)
#10/srv/mediawiki/php-1.45.0-wmf.15/vendor/wikimedia/parsoid/src/Wt2Html/TT/TemplateHandler.php(596)Wikimedia\Parsoid\Utils\PipelineUtils::processTemplateSource(Wikimedia\Parsoid\Config\Env, Wikimedia\Parsoid\Wt2Html\PageConfigFrame, Wikimedia\Parsoid\Tokens\SelfclosingTagTk, array, string, array)
#11/srv/mediawiki/php-1.45.0-wmf.15/vendor/wikimedia/parsoid/src/Wt2Html/TT/TemplateHandler.php(1033)Wikimedia\Parsoid\Wt2Html\TT\TemplateHandler->processTemplateSource(Wikimedia\Parsoid\Wt2Html\PageConfigFrame, Wikimedia\Parsoid\Tokens\SelfclosingTagTk, array, string, array)
#12/srv/mediawiki/php-1.45.0-wmf.15/vendor/wikimedia/parsoid/src/Wt2Html/TT/TemplateHandler.php(1060)Wikimedia\Parsoid\Wt2Html\TT\TemplateHandler->expandTemplate(Wikimedia\Parsoid\Wt2Html\TT\TemplateEncapsulator)
#13/srv/mediawiki/php-1.45.0-wmf.15/vendor/wikimedia/parsoid/src/Wt2Html/TT/TemplateHandler.php(1101)Wikimedia\Parsoid\Wt2Html\TT\TemplateHandler->onTemplate(Wikimedia\Parsoid\Tokens\SelfclosingTagTk)
#14/srv/mediawiki/php-1.45.0-wmf.15/vendor/wikimedia/parsoid/src/Wt2Html/TT/XMLTagBasedHandler.php(47)Wikimedia\Parsoid\Wt2Html\TT\TemplateHandler->onTag(Wikimedia\Parsoid\Tokens\SelfclosingTagTk)
#15/srv/mediawiki/php-1.45.0-wmf.15/vendor/wikimedia/parsoid/src/Wt2Html/TokenHandlerPipeline.php(129)Wikimedia\Parsoid\Wt2Html\TT\XMLTagBasedHandler->process(array)
#16/srv/mediawiki/php-1.45.0-wmf.15/vendor/wikimedia/parsoid/src/Wt2Html/TokenHandlerPipeline.php(193)Wikimedia\Parsoid\Wt2Html\TokenHandlerPipeline->processChunk(array)
#17/srv/mediawiki/php-1.45.0-wmf.15/vendor/wikimedia/parsoid/src/Wt2Html/TokenHandlerPipeline.php(191)Wikimedia\Parsoid\Wt2Html\TokenHandlerPipeline->processChunkily(string, array)
#18/srv/mediawiki/php-1.45.0-wmf.15/vendor/wikimedia/parsoid/src/Wt2Html/TreeBuilder/TreeBuilderStage.php(503)Wikimedia\Parsoid\Wt2Html\TokenHandlerPipeline->processChunkily(string, array)
#19[internal function]Wikimedia\Parsoid\Wt2Html\TreeBuilder\TreeBuilderStage->processChunkily(string, array)
#20/srv/mediawiki/php-1.45.0-wmf.15/vendor/wikimedia/parsoid/src/Wt2Html/DOMProcessorPipeline.php(196)Generator->current()
#21/srv/mediawiki/php-1.45.0-wmf.15/vendor/wikimedia/parsoid/src/Wt2Html/ParserPipeline.php(164)Wikimedia\Parsoid\Wt2Html\DOMProcessorPipeline->processChunkily(string, array)
#22/srv/mediawiki/php-1.45.0-wmf.15/vendor/wikimedia/parsoid/src/Wt2Html/ParserPipelineFactory.php(619)Wikimedia\Parsoid\Wt2Html\ParserPipeline->parseChunkily(string, array)
#23/srv/mediawiki/php-1.45.0-wmf.15/vendor/wikimedia/parsoid/src/Wikitext/ContentModelHandler.php(187)Wikimedia\Parsoid\Wt2Html\ParserPipelineFactory->parse(string)
#24/srv/mediawiki/php-1.45.0-wmf.15/vendor/wikimedia/parsoid/src/Parsoid.php(198)Wikimedia\Parsoid\Wikitext\ContentModelHandler->toDOM(Wikimedia\Parsoid\Ext\ParsoidExtensionAPI, null)
#25/srv/mediawiki/php-1.45.0-wmf.15/vendor/wikimedia/parsoid/src/Parsoid.php(264)Wikimedia\Parsoid\Parsoid->parseWikitext(MediaWiki\Parser\Parsoid\Config\PageConfig, MediaWiki\Parser\ParserOutput, array, null)
#26/srv/mediawiki/php-1.45.0-wmf.15/includes/parser/Parsoid/ParsoidParser.php(166)Wikimedia\Parsoid\Parsoid->wikitext2html(MediaWiki\Parser\Parsoid\Config\PageConfig, array, null, MediaWiki\Parser\ParserOutput)
#27/srv/mediawiki/php-1.45.0-wmf.15/includes/parser/Parsoid/ParsoidParser.php(294)MediaWiki\Parser\Parsoid\ParsoidParser->genParserOutput(MediaWiki\Parser\Parsoid\Config\PageConfig, MediaWiki\Parser\ParserOptions, MediaWiki\Parser\ParserOutput)
#28/srv/mediawiki/php-1.45.0-wmf.15/includes/content/WikitextContentHandler.php(389)MediaWiki\Parser\Parsoid\ParsoidParser->parse(string, MediaWiki\Title\Title, MediaWiki\Parser\ParserOptions, bool, bool, int, MediaWiki\Parser\ParserOutput)
#29/srv/mediawiki/php-1.45.0-wmf.15/includes/content/ContentHandler.php(1695)MediaWiki\Content\WikitextContentHandler->fillParserOutput(MediaWiki\Content\WikitextContent, MediaWiki\Content\Renderer\ContentParseParams, MediaWiki\Parser\ParserOutput)
#30/srv/mediawiki/php-1.45.0-wmf.15/includes/content/Renderer/ContentRenderer.php(75)MediaWiki\Content\ContentHandler->getParserOutput(MediaWiki\Content\WikitextContent, MediaWiki\Content\Renderer\ContentParseParams)
#31/srv/mediawiki/php-1.45.0-wmf.15/includes/Revision/RenderedRevision.php(261)MediaWiki\Content\Renderer\ContentRenderer->getParserOutput(MediaWiki\Content\WikitextContent, MediaWiki\Page\PageIdentityValue, MediaWiki\Revision\RevisionStoreRecord, MediaWiki\Parser\ParserOptions, array)
#32/srv/mediawiki/php-1.45.0-wmf.15/includes/Revision/RenderedRevision.php(233)MediaWiki\Revision\RenderedRevision->getSlotParserOutputUncached(MediaWiki\Content\WikitextContent, array)
#33/srv/mediawiki/php-1.45.0-wmf.15/includes/Revision/RevisionRenderer.php(237)MediaWiki\Revision\RenderedRevision->getSlotParserOutput(string, array)
#34/srv/mediawiki/php-1.45.0-wmf.15/includes/Revision/RevisionRenderer.php(170)MediaWiki\Revision\RevisionRenderer->combineSlotOutput(MediaWiki\Revision\RenderedRevision, MediaWiki\Parser\ParserOptions, array)
#35/srv/mediawiki/php-1.45.0-wmf.15/includes/Revision/RenderedRevision.php(196)MediaWiki\Revision\RevisionRenderer->MediaWiki\Revision\{closure}(MediaWiki\Revision\RenderedRevision, array)
#36/srv/mediawiki/php-1.45.0-wmf.15/includes/page/ParserOutputAccess.php(602)MediaWiki\Revision\RenderedRevision->getRevisionParserOutput()
#37/srv/mediawiki/php-1.45.0-wmf.15/includes/page/ParserOutputAccess.php(689)MediaWiki\Page\ParserOutputAccess->renderRevision(MediaWiki\Page\PageStoreRecord, MediaWiki\Parser\ParserOptions, MediaWiki\Revision\RevisionStoreRecord, array)
#38/srv/mediawiki/php-1.45.0-wmf.15/includes/poolcounter/PoolCounterWorkViaCallback.php(82)MediaWiki\Page\ParserOutputAccess->MediaWiki\Page\{closure}()
#39/srv/mediawiki/php-1.45.0-wmf.15/includes/poolcounter/PoolCounterWork.php(173)MediaWiki\PoolCounter\PoolCounterWorkViaCallback->doWork()
#40/srv/mediawiki/php-1.45.0-wmf.15/includes/page/ParserOutputAccess.php(506)MediaWiki\PoolCounter\PoolCounterWork->execute()
#41/srv/mediawiki/php-1.45.0-wmf.15/includes/Rest/Handler/Helper/HtmlOutputRendererHelper.php(931)MediaWiki\Page\ParserOutputAccess->getParserOutput(MediaWiki\Page\PageStoreRecord, MediaWiki\Parser\ParserOptions, MediaWiki\Revision\RevisionStoreRecord, array)
#42/srv/mediawiki/php-1.45.0-wmf.15/includes/Rest/Handler/Helper/HtmlOutputRendererHelper.php(661)MediaWiki\Rest\Handler\Helper\HtmlOutputRendererHelper->getParserOutputInternal()
#43/srv/mediawiki/php-1.45.0-wmf.15/includes/Rest/Handler/Helper/HtmlOutputRendererHelper.php(549)MediaWiki\Rest\Handler\Helper\HtmlOutputRendererHelper->getParserOutput()
#44/srv/mediawiki/php-1.45.0-wmf.15/includes/Rest/Handler/RevisionHTMLHandler.php(111)MediaWiki\Rest\Handler\Helper\HtmlOutputRendererHelper->getETag(string)
#45/srv/mediawiki/php-1.45.0-wmf.15/includes/Rest/Handler.php(502)MediaWiki\Rest\Handler\RevisionHTMLHandler->getETag()
#46/srv/mediawiki/php-1.45.0-wmf.15/includes/Rest/ConditionalHeaderUtil.php(68)MediaWiki\Rest\Handler->MediaWiki\Rest\{closure}()
#47/srv/mediawiki/php-1.45.0-wmf.15/includes/Rest/ConditionalHeaderUtil.php(79)MediaWiki\Rest\ConditionalHeaderUtil->getETag()
#48/srv/mediawiki/php-1.45.0-wmf.15/includes/Rest/ConditionalHeaderUtil.php(163)MediaWiki\Rest\ConditionalHeaderUtil->getETagParts()
#49/srv/mediawiki/php-1.45.0-wmf.15/includes/Rest/Handler.php(519)MediaWiki\Rest\ConditionalHeaderUtil->checkPreconditions(MediaWiki\Rest\RequestFromGlobals)
#50/srv/mediawiki/php-1.45.0-wmf.15/includes/Rest/Module/Module.php(412)MediaWiki\Rest\Handler->checkPreconditions()
#51/srv/mediawiki/php-1.45.0-wmf.15/includes/Rest/Module/Module.php(301)MediaWiki\Rest\Module\Module->executeHandler(MediaWiki\Rest\Handler\RevisionHTMLHandler)
#52/srv/mediawiki/php-1.45.0-wmf.15/includes/Rest/Router.php(485)MediaWiki\Rest\Module\Module->execute(string, MediaWiki\Rest\RequestFromGlobals)
#53/srv/mediawiki/php-1.45.0-wmf.15/includes/Rest/Router.php(444)MediaWiki\Rest\Router->doExecute(string, MediaWiki\Rest\RequestFromGlobals)
#54/srv/mediawiki/php-1.45.0-wmf.15/includes/Rest/EntryPoint.php(207)MediaWiki\Rest\Router->execute(MediaWiki\Rest\RequestFromGlobals)
#55/srv/mediawiki/php-1.45.0-wmf.15/includes/MediaWikiEntryPoint.php(198)MediaWiki\Rest\EntryPoint->execute()
#56/srv/mediawiki/php-1.45.0-wmf.15/rest.php(39)MediaWiki\MediaWikiEntryPoint->run()
#57/srv/mediawiki/w/rest.php(3)require(string)
#58{main}
Impact
Notes

Details

Request URL
https://sk.wikipedia.org/w/rest.php/v1/revision/8078143/html
Related Changes in Gerrit:
SubjectRepoBranchLines +/-
Use DOMCompat to append document fragmentmediawiki/extensions/Kartographermaster+4 -8
Avoid appending an empty Document Fragmentmediawiki/extensions/Kartographermaster+7 -1
Customize query in gerrit

Related Objects

Event Timeline

ABreault-WMF created this task.Aug 21 2025, 3:49 PM
Restricted Application added a subscriber: Aklapper. · View Herald TranscriptAug 21 2025, 3:49 PM
MSantos moved this task from Needs Triage to Bugs & Crashers on the Parsoid board.Aug 28 2025, 2:16 PM
MSantos added a project: Content-Transform-Team (Work In Progress).
MSantos moved this task from Backlog to Needs Investigation on the Content-Transform-Team (Work In Progress) board.
cscott claimed this task.Sep 8 2025, 3:26 PM
ssastry subscribed.Sep 8 2025, 6:01 PM

8 instances in the last month, so not a high priority, but can likely something busted in the extension API if it is returning an empty fragment for what is not an empty input string.

ssastry removed a project: Content-Transform-Team (Work In Progress).Sep 8 2025, 6:01 PM
hashar mentioned this in T407323: PHP Warning: DOMNode::appendChild(): Document Fragment is empty.Oct 15 2025, 9:17 AM
Lucas_Werkmeister_WMDE subscribed.Oct 20 2025, 1:08 PM

This is currently at the top of logspam-watch (166 occurrences in the past 60 minutes); Logstash suggests it’s picked up recently:

image.png (304×1 px, 30 KB)

The bulk of this is on mnw.wiktionary.org (16,249).

dancy subscribed.Oct 21 2025, 6:41 PM

I'm on train duty this week. I concur with @Lucas_Werkmeister_WMDE that this is warning is making itself very noticeable this week so far.

ABreault-WMF added a comment.Oct 21 2025, 7:50 PM

@Lucas_Werkmeister_WMDE @dancy The stack trace from the logs on mnwwiktionary that I'm seeing look more like T407323 than this one. There's already a patch out for that and the logs were supposed to be suppressed. I can backport the patch in the late window in the next 10 mins or so if you'd like

dancy added a comment.Oct 21 2025, 8:10 PM
In T402548#11295809, @ABreault-WMF wrote:

@Lucas_Werkmeister_WMDE @dancy The stack trace from the logs on mnwwiktionary that I'm seeing look more like T407323 than this one. There's already a patch out for that and the logs were supposed to be suppressed. I can backport the patch in the late window in the next 10 mins or so if you'd like

Yes please!

ABreault-WMF added a comment.Oct 21 2025, 9:13 PM

@dancy Ok, there hasn't been any occurrences of T407323 in the past half hour since the deploy

gerritbot added a comment.Oct 21 2025, 9:18 PM

Change #1197718 had a related patch set uploaded (by Arlolra; author: Arlolra):

[mediawiki/extensions/Kartographer@master] Avoid appending an empty Document Fragment

https://gerrit.wikimedia.org/r/1197718

gerritbot added a project: Patch-For-Review.Oct 21 2025, 9:18 PM
ABreault-WMF claimed this task.Oct 21 2025, 9:19 PM
ABreault-WMF triaged this task as Medium priority.
ABreault-WMF added projects: Content-Transform-Team (Work In Progress), Essential-Work.
ABreault-WMF moved this task from Needs Investigation to Code Review on the Content-Transform-Team (Work In Progress) board.
ABreault-WMF added a subscriber: cscott.
dancy added a comment.Oct 21 2025, 10:20 PM
In T402548#11296222, @ABreault-WMF wrote:

@dancy Ok, there hasn't been any occurrences of T407323 in the past half hour since the deploy

Thank you very much!

dancy awarded a token.Oct 21 2025, 10:21 PM
gerritbot added a comment.Oct 21 2025, 10:34 PM

Change #1197718 merged by jenkins-bot:

[mediawiki/extensions/Kartographer@master] Avoid appending an empty Document Fragment

https://gerrit.wikimedia.org/r/1197718

ABreault-WMF moved this task from Code Review to To Deploy on the Content-Transform-Team (Work In Progress) board.Oct 21 2025, 10:56 PM
ReleaseTaggerBot added a project: MW-1.45-notes (1.45.0-wmf.25; 2025-10-28).Oct 21 2025, 11:00 PM
Maintenance_bot removed a project: Patch-For-Review.Oct 21 2025, 11:31 PM
ABreault-WMF moved this task from To Deploy to To Verify on the Content-Transform-Team (Work In Progress) board.Oct 31 2025, 8:46 PM
ABreault-WMF closed this task as Resolved.Oct 31 2025, 8:54 PM
gerritbot added a comment.Dec 11 2025, 10:14 AM

Change #1217475 had a related patch set uploaded (by Arlolra; author: Arlolra):

[mediawiki/extensions/Kartographer@master] Use DOMCompat to append document fragment

https://gerrit.wikimedia.org/r/1217475

gerritbot added a project: Patch-For-Review.Dec 11 2025, 10:14 AM
gerritbot added a comment.Dec 12 2025, 4:08 PM

Change #1217475 merged by jenkins-bot:

[mediawiki/extensions/Kartographer@master] Use DOMCompat to append document fragment

https://gerrit.wikimedia.org/r/1217475

Maintenance_bot removed a project: Patch-For-Review.Dec 12 2025, 4:31 PM
ReleaseTaggerBot added a project: MW-1.46-notes (1.46.0-wmf.7; 2025-12-16).Dec 12 2025, 5:00 PM
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