compositing/clipping/border-radius-async-overflow-stacking.html Description: This test is flaky failing on Catalina. The flaky failures are apparent throughout the visible history. History: https://results.webkit.org/?suite=layout-tests&test=compositing%2Fclipping%2Fborder-radius-async-overflow-stacking.html&platform=mac&version_name=Catalina&limit=50000 Diff: https://build.webkit.org/results/Apple-Catalina-Release-WK2-Tests/r259063%20(4109)/compositing/clipping/border-radius-async-overflow-stacking-diffs.html
<rdar://problem/60934034>
I am able to reproduce this issue with the following command. run-webkit-tests --iterations 2000 --exit-after-n-failures 1 --exit-after-n-crashes-or-timeouts 1 --debug-rwt-logging --no-retry --force --no-build -f compositing/clipping/border-radius-async-overflow-stacking.html
Created attachment 394656 [details] border-radius-async-overflow-stacking-diff
I have marked this test as failing while this issue is investigated. https://trac.webkit.org/changeset/259075/webkit
Created attachment 408386 [details] Diff Image 09/09/2020
Created attachment 408387 [details] Expected Image 09/09/2020
Created attachment 408388 [details] Actual Image 09/09/2020
Test is very inconsistently flaky on macOS Catalina but now also flaky on BigSur+. Test is also flaky in iOS wk2. First occurrence of failure on iOS is at r262354 and on macOS Catalina from r262354. History: https://results.webkit.org/?suite=layout-tests&test=compositing%2Fclipping%2Fborder-radius-async-overflow-stacking.html&limit=50000&platform=ios&platform=mac Diff is different than before but not by much, difference now is 7 pixels. Please see attached. Will check if a re-baseline is in order. Test expectation changes: https://trac.webkit.org/changeset/266807/webkit