Bug 193107 - [ Mojave WK1 ] Layout Test fast/layers/blank-content-when-child-layer-is-at-negative-big-number.html and fast/layers/wrong-clipping-semi-transparent-compositing-layer-on-subpixel-position.html are flaky
Summary: [ Mojave WK1 ] Layout Test fast/layers/blank-content-when-child-layer-is-at-n...
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: Tools / Tests (show other bugs)
Version: WebKit Nightly Build
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Nobody
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2019-01-03 08:42 PST by Truitt Savell
Modified: 2019-01-04 11:15 PST (History)
5 users (show)

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Description Truitt Savell 2019-01-03 08:42:51 PST
The following layout tests are flaky on Mojave WK1

fast/layers/blank-content-when-child-layer-is-at-negative-big-number.html
fast/layers/wrong-clipping-semi-transparent-compositing-layer-on-subpixel-position.html

Probable cause:

These two tests are failing in tandem. They seem to be drawing something and unexpectedly zooming in on the result. similar to https://bugs.webkit.org/show_bug.cgi?id=192881 and https://bugs.webkit.org/show_bug.cgi?id=193091

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=fast%2Flayers%2Fblank-content-when-child-layer-is-at-negative-big-number.html%20fast%2Flayers%2Fwrong-clipping-semi-transparent-compositing-layer-on-subpixel-position.html

Image diffs:

fast/layers/blank-content-when-child-layer-is-at-negative-big-number.html
https://build.webkit.org/results/Apple%20Mojave%20Release%20WK1%20(Tests)/r239589%20(1907)/fast/layers/blank-content-when-child-layer-is-at-negative-big-number-diffs.html

fast/layers/wrong-clipping-semi-transparent-compositing-layer-on-subpixel-position.html
https://build.webkit.org/results/Apple%20Mojave%20Release%20WK1%20(Tests)/r239589%20(1907)/fast/layers/wrong-clipping-semi-transparent-compositing-layer-on-subpixel-position-diffs.html
Comment 1 Simon Fraser (smfr) 2019-01-04 11:15:12 PST
Mojave WK1 is basically a world of hurt.