There is an inconsistency in how hhvm handles / [de]serializes items (specifically statements) vs. php5.

We have test.wikidata on hhvm only

We have test2.wikipedia which has hhvm as a beta feature, so you can have hhvm or not.

If I use the property parser function on a connected page, then the entity is loaded via CachingEntityRevisionLookup (memcached).

If I am using hhvm, then it works. If I use php5 then I get a stacktrace.

If I remove the statements from the associated item, then then no stacktrace on the test2 page.

Unexpected non-MediaWiki exception encountered, of type "UnexpectedValueException"
[b084b1ad] /wiki/Kitten Exception from line 124 of /srv/mediawiki/php-1.25wmf1/includes/objectcache/MemcachedPeclBagOStuff.php: Error at offset 0 of 6 bytes
Backtrace:
#0 [internal function]: SplObjectStorage->unserialize(string)
#1 /srv/mediawiki/php-1.25wmf1/includes/objectcache/MemcachedPeclBagOStuff.php(124): Memcached->get(string, NULL, NULL)
#2 /srv/mediawiki/php-1.25wmf1/extensions/Wikidata/extensions/Wikibase/lib/includes/store/CachingEntityRevisionLookup.php(107): MemcachedPeclBagOStuff->get(string)
#3 /srv/mediawiki/php-1.25wmf1/extensions/Wikidata/extensions/Wikibase/lib/includes/store/CachingEntityRevisionLookup.php(146): Wikibase\Lib\Store\CachingEntityRevisionLookup->getEntityRevision(Wikibase\DataModel\Entity\ItemId, integer)
#4 /srv/mediawiki/php-1.25wmf1/extensions/Wikidata/extensions/Wikibase/lib/includes/store/CachingEntityRevisionLookup.php(126): Wikibase\Lib\Store\CachingEntityRevisionLookup->fetchEntityRevision(Wikibase\DataModel\Entity\ItemId, integer)
#5 /srv/mediawiki/php-1.25wmf1/extensions/Wikidata/extensions/Wikibase/lib/includes/store/RevisionBasedEntityLookup.php(41): Wikibase\Lib\Store\CachingEntityRevisionLookup->getEntityRevision(Wikibase\DataModel\Entity\ItemId)
#6 [internal function]: Wikibase\Lib\Store\RevisionBasedEntityLookup->getEntity(Wikibase\DataModel\Entity\ItemId)
#7 /srv/mediawiki/php-1.25wmf1/extensions/Wikidata/extensions/Wikibase/lib/includes/store/EntityRedirectResolvingDecorator.php(79): call_user_func_array(array, array)
#8 /srv/mediawiki/php-1.25wmf1/extensions/Wikidata/extensions/Wikibase/lib/includes/store/RedirectResolvingEntityLookup.php(50): Wikibase\Lib\Store\EntityRedirectResolvingDecorator->__call(string, array)
#9 /srv/mediawiki/php-1.25wmf1/extensions/Wikidata/extensions/Wikibase/lib/includes/store/RedirectResolvingEntityLookup.php(50): Wikibase\Lib\Store\EntityRedirectResolvingDecorator->getEntity(Wikibase\DataModel\Entity\ItemId)
#10 /srv/mediawiki/php-1.25wmf1/extensions/Wikidata/extensions/Wikibase/client/includes/DataAccess/PropertyParserFunction/SnaksFinder.php(55): Wikibase\Lib\Store\RedirectResolvingEntityLookup->getEntity(Wikibase\DataModel\Entity\ItemId)
#11 /srv/mediawiki/php-1.25wmf1/extensions/Wikidata/extensions/Wikibase/client/includes/DataAccess/PropertyParserFunction/LanguageAwareRenderer.php(107): Wikibase\DataAccess\PropertyParserFunction\SnaksFinder->findSnaks(Wikibase\DataModel\Entity\ItemId, string, string)
#12 /srv/mediawiki/php-1.25wmf1/extensions/Wikidata/extensions/Wikibase/client/includes/DataAccess/PropertyParserFunction/LanguageAwareRenderer.php(49): Wikibase\DataAccess\PropertyParserFunction\LanguageAwareRenderer->getStatus(Wikibase\DataModel\Entity\ItemId, string)
#13 /srv/mediawiki/php-1.25wmf1/extensions/Wikidata/extensions/Wikibase/client/includes/DataAccess/PropertyParserFunction/Runner.php(73): Wikibase\DataAccess\PropertyParserFunction\LanguageAwareRenderer->render(Wikibase\DataModel\Entity\ItemId, string)
#14 /srv/mediawiki/php-1.25wmf1/extensions/Wikidata/extensions/Wikibase/client/includes/DataAccess/PropertyParserFunction/Runner.php(120): Wikibase\DataAccess\PropertyParserFunction\Runner->runPropertyParserFunction(Parser, string)
#15 /srv/mediawiki/php-1.25wmf1/extensions/Wikidata/extensions/Wikibase/client/includes/hooks/ParserFunctionRegistrant.php(46): Wikibase\DataAccess\PropertyParserFunction\Runner::render(Parser, string)
#16 [internal function]: Wikibase\Client\Hooks\{closure}(Parser, string)
#17 /srv/mediawiki/php-1.25wmf1/includes/parser/Parser.php(3768): call_user_func_array(Closure, array)
#18 /srv/mediawiki/php-1.25wmf1/includes/parser/Parser.php(3486): Parser->callParserFunction(PPFrame_DOM, string, array)
#19 /srv/mediawiki/php-1.25wmf1/includes/parser/Preprocessor_DOM.php(1179): Parser->braceSubstitution(array, PPFrame_DOM)
#20 /srv/mediawiki/php-1.25wmf1/includes/parser/Parser.php(3296): PPFrame_DOM->expand(PPNode_DOM, integer)
#21 /srv/mediawiki/php-1.25wmf1/includes/parser/Parser.php(1254): Parser->replaceVariables(string)
#22 /srv/mediawiki/php-1.25wmf1/includes/parser/Parser.php(420): Parser->internalParse(string)
#23 /srv/mediawiki/php-1.25wmf1/includes/content/WikitextContent.php(338): Parser->parse(string, Title, ParserOptions, boolean, boolean, integer)
#24 /srv/mediawiki/php-1.25wmf1/includes/content/AbstractContent.php(490): WikitextContent->fillParserOutput(Title, integer, ParserOptions, boolean, ParserOutput)
#25 /srv/mediawiki/php-1.25wmf1/includes/poolcounter/PoolWorkArticleView.php(139): AbstractContent->getParserOutput(Title, integer, ParserOptions)
#26 /srv/mediawiki/php-1.25wmf1/includes/poolcounter/PoolCounterWork.php(123): PoolWorkArticleView->doWork()
#27 /srv/mediawiki/php-1.25wmf1/includes/page/Article.php(688): PoolCounterWork->execute()
#28 /srv/mediawiki/php-1.25wmf1/includes/actions/ViewAction.php(44): Article->view()
#29 /srv/mediawiki/php-1.25wmf1/includes/MediaWiki.php(414): ViewAction->show()
#30 /srv/mediawiki/php-1.25wmf1/includes/MediaWiki.php(282): MediaWiki->performAction(Article, Title)
#31 /srv/mediawiki/php-1.25wmf1/includes/MediaWiki.php(584): MediaWiki->performRequest()
#32 /srv/mediawiki/php-1.25wmf1/includes/MediaWiki.php(435): MediaWiki->main()
#33 /srv/mediawiki/php-1.25wmf1/index.php(46): MediaWiki->run()
#34 /srv/mediawiki/w/index.php(3): require(string)

Version: unspecified
Severity: normal