The test loader/stateobjects/replacestate-size.html is a flaky timeout. According to the flakiness dashboard it is currently only on Sierra Debug WK2. The test is already marked as slow but it will intermittently run as long as 250 seconds https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=loader%2Fstateobjects%2Freplacestate-size.html https://build.webkit.org/builders/Apple%20Sierra%20Debug%20WK2%20(Tests)/builds/1302 https://build.webkit.org/results/Apple%20Sierra%20Debug%20WK2%20(Tests)/r217654%20(1302)/results.html First timeout on the dashboard was on 5/20/2017 https://build.webkit.org/builders/Apple%20Sierra%20Debug%20WK2%20(Tests)/builds/1118 https://build.webkit.org/results/Apple%20Sierra%20Debug%20WK2%20(Tests)/r217187%20(1118)/results.html The test always times out with loader/stateobjects/replacestate-size-iframe.html
Marked test as flaky: https://trac.webkit.org/changeset/221115/webkit