Object of class ParserOptions could not be converted to string
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	ori
	Aug 31 2015, 11:02 PM

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Seen in fluorine:/a/mw-log/fatal.log:

2015-08-31 11:36:54 mw1250 ruwiki fatal ERROR: [a1e2fd55] /wiki/%D0%90%D0%BA%D1%81%D0%B8%D0%BE%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D0%B0_%D1%82%D0%B5%D0%BE%D1%80%D0%B8%D0%B8_%D0%BC%D0%BD%D0%BE%D0%B6%D0%B5%D1%81%D1%82%D0%B2   ErrorException from line 5822 of /srv/mediawiki/php-1.26wmf20/includes/parser/Parser.php: PHP Error: Object of class ParserOptions could not be converted to string {"exception":"[Exception ErrorException] (/srv/mediawiki/php-1.26wmf20/includes/parser/Parser.php:5822) PHP Error: Object of class ParserOptions could not be converted to string
[stacktrace]
#0 /srv/mediawiki/php-1.26wmf20/includes/parser/Parser.php(5822): MWExceptionHandler::handleError(integer, string, string, integer)
#1 /srv/mediawiki/php-1.26wmf20/includes/parser/Parser.php(1333): Parser->replaceTransparentTags(string)
#2 /srv/mediawiki/php-1.26wmf20/includes/parser/Parser.php(442): Parser->internalParseHalfParsed(string, boolean, boolean)
#3 /srv/mediawiki/php-1.26wmf20/includes/StubObject.php(105): Parser->parse(string, Title, ParserOptions, boolean, boolean, integer)
#4 /srv/mediawiki/php-1.26wmf20/includes/StubObject.php(129): StubObject->_call(string, array)
#5 /srv/mediawiki/php-1.26wmf20/includes/content/WikitextContent.php(331): StubObject->__call(string, array)
#6 /srv/mediawiki/php-1.26wmf20/includes/content/AbstractContent.php(497): WikitextContent->fillParserOutput(Title, integer, ParserOptions, boolean, ParserOutput)
#7 /srv/mediawiki/php-1.26wmf20/includes/poolcounter/PoolWorkArticleView.php(140): AbstractContent->getParserOutput(Title, integer, ParserOptions)
#8 /srv/mediawiki/php-1.26wmf20/includes/poolcounter/PoolCounterWork.php(123): PoolWorkArticleView->doWork()
#9 /srv/mediawiki/php-1.26wmf20/includes/page/Article.php(676): PoolCounterWork->execute()
#10 /srv/mediawiki/php-1.26wmf20/includes/actions/ViewAction.php(44): Article->view()
#11 /srv/mediawiki/php-1.26wmf20/includes/MediaWiki.php(456): ViewAction->show()
#12 /srv/mediawiki/php-1.26wmf20/includes/MediaWiki.php(255): MediaWiki->performAction(Article, Title)
#13 /srv/mediawiki/php-1.26wmf20/includes/MediaWiki.php(683): MediaWiki->performRequest()
#14 /srv/mediawiki/php-1.26wmf20/includes/MediaWiki.php(474): MediaWiki->main()
#15 /srv/mediawiki/php-1.26wmf20/index.php(41): MediaWiki->run()
#16 /srv/mediawiki/w/index.php(3): include(string)
#17 {main}

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Mentioned Here: P1956 T110968 bursts

Event Timeline

ori created this task.Aug 31 2015, 11:02 PM

ori raised the priority of this task from to High.

ori updated the task description. (Show Details)

ori added projects: MediaWiki-Parser, Parsing-Team--ARCHIVED.

ori subscribed.

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptAug 31 2015, 11:02 PM

Jdforrester-WMF added a project: Wikimedia-production-error.Aug 31 2015, 11:05 PM

Jdforrester-WMF set Security to None.

It's difficult to see how that could have happened, given that mTransparentTagHooks is empty on ruwiki, and grepping php-1.26wmf20 core and extensions shows no callers of setTransparentTagHook(). extractTagsAndParams() can match and return HTML comments when given an empty array for $elements, but then where does the ParserOptions come from? And it's not always a ParserOptions:

$ zgrep 'Parser.php:5822' archive/fatal.log-20150831.gz | perl -ne 'while (<>) {if (/Object of class (\w+)/ ) {print "$1\n"; } }' | sort | uniq -c | sort -rn
   49 ParserOptions
   16 ParserOutput
   16 Article
    2 WikiPage
    2 Revision

It seems like the most likely explanation is an HHVM bug, perhaps VM stack corruption or a dangling pointer which is used in a predictable way. The logs show different servers being involved, with a burst of 5-10 errors from each server. Each burst lasts for less than a second: P1956

It seems that the bursts are terminated by a segfault:

Aug 30 09:00:05 mw1254 hhvm: Core dumped: Segmentation fault
Aug 30 15:41:46 mw1181 hhvm: Core dumped: Segmentation fault
Aug 30 16:56:25 mw1042 hhvm: Core dumped: Segmentation fault

Those three log entries correlate with the first three bursts in the fatal log.

tstarling edited projects, added HHVM; removed Parsing-Team--ARCHIVED, MediaWiki-Parser.Aug 31 2015, 11:47 PM

ori closed this task as a duplicate of T109540: Segfault in strtr().Sep 1 2015, 12:08 AM

• demon moved this task from Untriaged to Resolved on the Wikimedia-production-error board.Sep 1 2015, 5:32 PM

Object of class ParserOptions could not be converted to stringClosed, DuplicatePublicActions

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Object of class ParserOptions could not be converted to string
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