[ macOS ARM64 ] compositing/background-color/no-composited-background-color-when-perspective.html is a flakey Image failure (4 pixels)

• Component: Compositing
• Status: NEW ---

[Robert Jenner]

compositing/background-color/no-composited-background-color-when-perspective.html

is a flakey image only failure on macOS Apple Silicon Macs only.

HISTORY URL:
https://results.webkit.org/?suite=layout-tests&test=compositing%2Fbackground-color%2Fno-composited-background-color-when-perspective.html

IMAGE DIFF URL
https://build.webkit.org/results/Apple-BigSur-Debug-AppleSilicon-WK2-Tests/r275450%20(503)/compositing/background-color/no-composited-background-color-when-perspective-diffs.html

[Radar WebKit Bug Importer]

<rdar://problem/76239803>

[Alexey Proskuryakov]

This test failed once or twice on several queues on 2021-04-05, and went to passing again. It's quite mysterious, as I don't see any reverts or follow-up fixes there.

[Robert Jenner]

Created attachment 425322 [details]
diff images for test

Attaching diff images from test

[Robert Jenner]

(In reply to Alexey Proskuryakov from comment #2)
> This test failed once or twice on several queues on 2021-04-05, and went to
> passing again. It's quite mysterious, as I don't see any reverts or
> follow-up fixes there.

Yeah, I'm just getting around to re-examining this today. I agree that it's strange, and it doesn't look like there was anything done to fix it. This test does appear to have a history of being flakey since it started running on Apple Silicon Macs.

[Robert Jenner]

Updated test expectations here to Pass ImageOnlyFailure while test is reviewed:
https://trac.webkit.org/changeset/275550/webkit