http/tests/inspector/network/resource-response-source-memory-cache-revalidate-expired-only.html is a flaky failure on Mac Debug according to the Dashboard. https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=http%2Ftests%2Finspector%2Fnetwork%2Fresource-response-source-memory-cache-revalidate-expired-only.html Build: https://build.webkit.org/results/Apple%20Sierra%20Debug%20WK2%20(Tests)/r219737%20(2150)/results.html https://build.webkit.org/builders/Apple%20Sierra%20Debug%20WK2%20(Tests)/builds/2150 This does not appear to be a recent regression. Diff: --- /Volumes/Data/slave/sierra-debug-tests-wk2/build/layout-test-results/http/tests/inspector/network/resource-response-source-memory-cache-revalidate-expired-only-expected.txt +++ /Volumes/Data/slave/sierra-debug-tests-wk2/build/layout-test-results/http/tests/inspector/network/resource-response-source-memory-cache-revalidate-expired-only-actual.txt @@ -4,6 +4,10 @@ == Running test suite: Resource.ResponseSource.MemoryCache -- Running test case: Resource.ResponseSource.MemoryCache PASS: Resource should be exist. -PASS: statusCode should be 304 -PASS: responseSource should be Symbol(memory-cache) +FAIL: statusCode should be 304 + Expected: 304 + Actual: NaN +FAIL: responseSource should be Symbol(memory-cache) + Expected: Symbol(memory-cache) + Actual: Symbol(unknown)