Anomie added a subscriber: Anomie.
Anomie added a comment.

I could reproduce this by directing copies of the erroring queries to mw1230, 
mw1147, and mw1200; it didn't happen with the same queries directed to 
different hosts. Nothing in the code looks suspect.

I tried using some live hacks on those hosts to see what was going on. The 
$module->getFinalParams() call from ApiParamInfo was returning the params for 
ApiMain instead of for the module in question for some unknown reason. But as 
soon as I touched ApiBase.php the bug was suddenly fixed, which makes me 
suspect some sort of HHVM code-cache corruption.

I haven't touched mw1200 in case someone who knows more about HHVM wants to 
look into it. To test it from terbium, use this command:

  curl -H "Host: www.wikidata.org" 
'http://mw1200.eqiad.wmnet/w/api.php?action=paraminfo&modules=wbremovequalifiers%7Cwbremovereferences%7Cwbsearchentities%7Cwbsetaliases%7Cwbsetclaim%7Cwbsetclaimvalue%7Cwbsetdescription%7Cwbsetlabel%7Cwbsetqualifier%7Cwbsetreference%7Cwbsetsitelink%7Cwbsgetsuggestions&maxlag=5&format=json'


TASK DETAIL
  https://phabricator.wikimedia.org/T109929

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To: Anomie
Cc: Anomie, Krenair, Aklapper, pywikibot-bugs-list, jayvdb, Joe, jeremyb, 
Legoktm, greg, Malyacko



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