Over the last couple days, I've seen the following failure in CI for unrelated patches, such as r1334294 (full CI log):
1) Wikimedia\Tests\ObjectCache\WANObjectCacheTest::testGetWithSetCallback_touchedCallback_versioned Recompute under main key Failed asserting that two strings are identical. --- Expected +++ Actual @@ @@ -'xxx3' +'xxx2' /workspace/src/tests/phpunit/unit/includes/libs/ObjectCache/WANObjectCacheTest.php:687
The test seems to be flaky and failing randomly.