fast/images/image-subsampling.html Is a flaky image failure on iOS (both iOS 14 and iOS 15). The test failure is mainly seen on Release, but it also seen on Debug. History: https://results.webkit.org/?suite=layout-tests&test=fast%2Fimages%2Fimage-subsampling.html Result page: https://build.webkit.org/results/Apple-iOS-14-Simulator-Release-WK2-Tests/r283111%20(3394)/results.html
<rdar://problem/83589989>
Created attachment 439394 [details] Image diff
Marked test expectations: https://trac.webkit.org/changeset/283133/webkit
I was not able to reproduce the image failure locally on iOS 14 simulator using run-webkit-tests --force --ios-simulator --iterations 100 --exit-after-n-failures 1 fast/images/image-subsampling.html. (The revision I tested was r281967. The failure has been seen for a while according to the history, so I should be able to reproduce with that revision if it was reproducible.)
Actual image is missing the red square. This seems almost impossible. Why would these work ctx.fillStyle = "green" ctx.fillStyle = "blue" and ctx.fillStyle = "red" right before them not work?
Alexey confirmed this is no longer happening as of 5/25/2022.
Test gardening commit 252059@main (d26049d74aa8): <https://commits.webkit.org/252059@main> Reviewed commits have been landed. Closing PR #2003 and removing active labels.
(In reply to EWS from comment #7) > Test gardening commit 252059@main (d26049d74aa8): > <https://commits.webkit.org/252059@main> > > Reviewed commits have been landed. Closing PR #2003 and removing active > labels. Removed iOS expectations in above commit.