To test, run:

php /vagrant/mediawiki/tests/phpunit/phpunit.php --use-bagostuff=redis /vagrant/mediawiki/tests/phpunit/includes/objectcache/BagOStuffTest.php

It occasionally fails (the reason for being non-deterministic may be the usleep) with:

BagOStuffTest::testMerge
Failed asserting that true is false.

BagOStuffTest::testGet
Array (...) does not match expected type "string".

BagOStuffTest::testGetMulti
Failed asserting that two arrays are equal.

or some combination thereof.

Version: 1.22.0
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=55986