svg/animations/smil-leak-list-property-instances.svg has become a flaky failure on Mac WK1 testers according to the flakiness dashboard. https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=svg%2Fanimations%2Fsmil-leak-list-property-instances.svg It started with this build: https://build.webkit.org/builders/Apple%20Sierra%20Debug%20WK1%20(Tests)/builds/2204 The last time the svg files were touched were with: https://trac.webkit.org/changeset/219045/webkit However I have been unable to reproduce the failure locally and can't tell if the issue goes back further than this. Current failure: https://build.webkit.org/results/Apple%20El%20Capitan%20Debug%20WK1%20(Tests)/r219210%20(2308)/results.html https://build.webkit.org/builders/Apple%20El%20Capitan%20Debug%20WK1%20(Tests)/builds/2308 Diff: --- /Volumes/Data/slave/elcapitan-debug-tests-wk1/build/layout-test-results/svg/animations/animation-leak-list-property-instances-expected.txt +++ /Volumes/Data/slave/elcapitan-debug-tests-wk1/build/layout-test-results/svg/animations/animation-leak-list-property-instances-actual.txt @@ -1,3 +1,3 @@ This test checks that transform animations in SVG elements do not cause the whole SVGDocument to leak. -PASS +FAIL: not enough live nodes freed: 13 vs 4 expected Recently another test that was added that was extremely flaky was showing the same diff as its output. Attaching bug in See also section