From https://bugs.webkit.org/show_bug.cgi?id=96041#c12 , running http/tests/cache/cancel-during-revalidation-succeeded.html causes the 2 following tests to fail. I can repro with: new-run-webkit-tests --no-new-test-results --skip-failing-tests --verbose http on my Chromium Linux machine. The test is marked as flakey in TestExpectations. This bug is to track the TestExpectations entry.