[Webkit-unassigned] [Bug 217690] New: REGRESSION (iOS 14): [ iOS wk2 ] 12 2d.gradient.radial WPT tests are a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=217690

            Bug ID: 217690
           Summary: REGRESSION (iOS 14): [ iOS wk2 ] 12 2d.gradient.radial
                    WPT tests are a flaky failure
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rackler at apple.com

Description:
imported/w3c/web-platform-tests/html/canvas/element/fill-and-stroke-styles/2d.gradient.radial.cone.bottom.html
imported/w3c/web-platform-tests/html/canvas/element/fill-and-stroke-styles/2d.gradient.radial.cone.cylinder.html
imported/w3c/web-platform-tests/html/canvas/element/fill-and-stroke-styles/2d.gradient.radial.cone.front.html
imported/w3c/web-platform-tests/html/canvas/element/fill-and-stroke-styles/2d.gradient.radial.cone.shape1.html
imported/w3c/web-platform-tests/html/canvas/element/fill-and-stroke-styles/2d.gradient.radial.cone.top.html
imported/w3c/web-platform-tests/html/canvas/element/fill-and-stroke-styles/2d.gradient.radial.inside1.html
imported/w3c/web-platform-tests/html/canvas/element/fill-and-stroke-styles/2d.gradient.radial.inside2.html
imported/w3c/web-platform-tests/html/canvas/element/fill-and-stroke-styles/2d.gradient.radial.inside3.html
imported/w3c/web-platform-tests/html/canvas/element/fill-and-stroke-styles/2d.gradient.radial.outside1.html
imported/w3c/web-platform-tests/html/canvas/element/fill-and-stroke-styles/2d.gradient.radial.outside2.html
imported/w3c/web-platform-tests/html/canvas/element/fill-and-stroke-styles/2d.gradient.radial.outside3.html
imported/w3c/web-platform-tests/html/canvas/element/fill-and-stroke-styles/2d.gradient.radial.touch2.html

I do not see a flaky failure appearing on the dashboard at any point since iOS 14 introduction, but layout test results indicates they are tests failed diff.
All the tests have the same diff log.

I attempted to reproduce with the same spade revision as the layout test results, but could not not.

History:
https://results.webkit.org/?suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fhtml%2Fcanvas%2Felement%2Ffill-and-stroke-styles%2F2d.gradient.radial.cone.bottom.html&test=imported%2Fw3c%2Fweb-platform-tests%2Fhtml%2Fcanvas%2Felement%2Ffill-and-stroke-styles%2F2d.gradient.radial.cone.cylinder.html&test=imported%2Fw3c%2Fweb-platform-tests%2Fhtml%2Fcanvas%2Felement%2Ffill-and-stroke-styles%2F2d.gradient.radial.cone.front.html&test=imported%2Fw3c%2Fweb-platform-tests%2Fhtml%2Fcanvas%2Felement%2Ffill-and-stroke-styles%2F2d.gradient.radial.cone.shape1.html&test=imported%2Fw3c%2Fweb-platform-tests%2Fhtml%2Fcanvas%2Felement%2Ffill-and-stroke-styles%2F2d.gradient.radial.cone.top.html&test=imported%2Fw3c%2Fweb-platform-tests%2Fhtml%2Fcanvas%2Felement%2Ffill-and-stroke-styles%2F2d.gradient.radial.inside1.html&test=imported%2Fw3c%2Fweb-platform-tests%2Fhtml%2Fcanvas%2Felement%2Ffill-and-stroke-styles%2F2d.gradient.radial.inside2.html&test=imported%2Fw3c%2Fweb-platform-tests%2Fhtml%2Fcanvas%2Felement%2Ffill-and-stroke-styles%2F2d.gradient.radial.inside3.html&test=imported%2Fw3c%2Fweb-platform-tests%2Fhtml%2Fcanvas%2Felement%2Ffill-and-stroke-styles%2F2d.gradient.radial.outside1.html&test=imported%2Fw3c%2Fweb-platform-tests%2Fhtml%2Fcanvas%2Felement%2Ffill-and-stroke-styles%2F2d.gradient.radial.outside2.html&test=imported%2Fw3c%2Fweb-platform-tests%2Fhtml%2Fcanvas%2Felement%2Ffill-and-stroke-styles%2F2d.gradient.radial.outside3.html&test=imported%2Fw3c%2Fweb-platform-tests%2Fhtml%2Fcanvas%2Felement%2Ffill-and-stroke-styles%2F2d.gradient.radial.touch2.html&platform=ios&limit=50000

Layout Test Results:
https://build-safari.apple.com/results/Trunk-Azul-iOS-Simulator-Production-WK2-Tests/r268415_966617bc44621941f27f415c38e90b51d9f5a747%20(17560)/results.html

Diff Log:
imported/w3c/web-platform-tests/html/canvas/element/fill-and-stroke-styles/2d.gradient.radial.cone.bottom.html
--- /Volumes/Data/worker/trunk-azul-ios-sim-production-wk2-tests/build/OpenSource/layout-test-results/imported/w3c/web-platform-tests/html/canvas/element/fill-and-stroke-styles/2d.gradient.radial.cone.bottom-expected.txt
+++ /Volumes/Data/worker/trunk-azul-ios-sim-production-wk2-tests/build/OpenSource/layout-test-results/imported/w3c/web-platform-tests/html/canvas/element/fill-and-stroke-styles/2d.gradient.radial.cone.bottom-actual.txt
@@ -3,5 +3,5 @@
 Expected output:


-FAIL Canvas test: 2d.gradient.radial.cone.bottom assert_equals: Green channel of the pixel at (98, 25) expected 255 but got 254
+PASS Canvas test: 2d.gradient.radial.cone.bottom

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