http/tests/xmlhttprequest/timeout/xmlhttprequest-timeout-overrides.html has become flaky last week (first failure ever was on April 24th). Not frequent enough to determine the culprit.
-PASS XHR2 Timeout Property Tests
-PASS XHR2 Timeout Property Tests 1
+Harness Error. harness_status.status = 2 , harness_status.message = null
r189989 adds this flakiness to the TestExpectations file.
Still frequently happening: https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=http%2Ftests%2Fxmlhttprequest%2Ftimeout%2Fxmlhttprequest-timeout-worker-overridesexpires.html
XHR timeout tests are not in a good shape, sadly.