LayoutTest fast/workers/worker-exception-during-navigation.html is a flaky timeout https://build.webkit.org/builders/Apple%20Sierra%20Release%20WK2%20(Tests)/builds/885 https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=fast%2Fworkers%2Fworker-exception-during-navigation.html
*** This bug has been marked as a duplicate of bug 171234 ***