Marostegui added subscribers: Anomie, Marostegui.
Marostegui added a comment.

Is that stack trace representative? is it always INSERT INTO revision_comment_temp?

It's quite possible that this was caused by the MCR patches, but so far, I don't have any clue as to how or why.

From what I can see it was not only related to that table and to that write, there are lots of others, but the INSERT INTO revision_comment_temp (revcomment_rev,revcomment_comment_id) VALUES ('xx','x') appears quite a lot. There are around 1000 errors for that table on that specific timeframe: https://logstash.wikimedia.org/goto/43b11908e6569dd05fc09fe450c9ed06
ie of other complains:

[WzQlFwpAEDUAABFY@OYAAACB] /w/api.php   Wikimedia\Rdbms\DBQueryError from line 1443 of /srv/mediawiki/php-1.32.0-wmf.8/includes/libs/rdbms/database/Database.php: A database query error has occurred. Did you forget to run your application's database schema updater after upgrading? 
Query: UPDATE  `category` SET cat_pages = cat_pages - 1,cat_files = cat_files - 1 WHERE cat_title IN ('xx',xx) 
Function: WikiPage::updateCategoryCounts
Error: 1205 Lock wait timeout exceeded; try restarting transaction (10.64.16.77)

Or:

[WzP3@QpAAEoAAJNLTYUAAAAW] /w/api.php   Wikimedia\Rdbms\DBQueryError from line 1443 of /srv/mediawiki/php-1.32.0-wmf.8/includes/libs/rdbms/database/Database.php: A database query error has occurred. Did you forget to run your application's database schema updater after upgrading? 
Query: SELECT  page_latest  FROM `page`    WHERE page_id = 'x' AND page_namespace = '2' AND page_title = 'xx'  LIMIT 1   FOR UPDATE
Function: WikiPage::lockAndGetLatest
Error: 1205 Lock wait timeout exceeded; try restarting transaction (10.64.16.77)
User::loadFromDatabase	10.64.0.110	1205	Lock wait timeout exceeded; try restarting transaction (10.64.0.110)	SELECT  user_id,user_name,user_real_name,user_email,user_touched,user_token,user_email_authenticated,user_email_token,user_email_token_expires,user_registration,user_editcount  FROM `user`    WHERE user_id = 'xx'  LIMIT 1   FOR UPDATE

TASK DETAIL
https://phabricator.wikimedia.org/T198350

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To: dduvall, Marostegui
Cc: Marostegui, Anomie, cscott, daniel, Tgr, Addshore, Herzi.Pinki, DC, Yann, Raymond, DerHexer, matmarex, AlexisJazz, Aklapper, greg, Jdforrester-WMF, Stashbot, gerritbot, MarcoAurelio, revi, dduvall, AndyTan, Rayssa-, Lahi, Gq86, GoranSMilovanovic, QZanden, LawExplorer, Minhnv-2809, Luke081515, Wikidata-bugs, aude, Mbch331, Jay8g, Krenair
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