Bug 217690

Summary:	REGRESSION (iOS 14): [ iOS wk2 ] 12 2d.gradient.radial WPT tests are a flaky failure
Product:	WebKit	Reporter:	Karl Rackler <rackler>
Component:	New Bugs	Assignee:	Karl Rackler <rackler>
Status:	RESOLVED INVALID
Severity:	Normal	CC:	webkit-bot-watchers-bugzilla, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Karl Rackler 2020-10-13 18:18:20 PDT

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



Diff Log:
imported/w3c/web-platform-tests/html/canvas/element/fill-and-stroke-styles/2d.gradient.radial.cone.bottom.html
--- build/OpenSource/layout-test-results/imported/w3c/web-platform-tests/html/canvas/element/fill-and-stroke-styles/2d.gradient.radial.cone.bottom-expected.txt
+++ 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

Comment 1 Radar WebKit Bug Importer 2020-10-13 18:18:43 PDT

<rdar://problem/70274719>

Comment 2 Karl Rackler 2020-10-13 18:31:36 PDT

I have marked these tests as skip while this issue is investigated.
https://trac.webkit.org/changeset/268441/webkit

Comment 3 Karl Rackler 2020-10-14 04:51:14 PDT

Reverted r268441 for reason:

This reverts commit r268441 made in error.

Committed r268450: <https://trac.webkit.org/changeset/268450>

Comment 4 Karl Rackler 2020-10-14 04:54:07 PDT

This bug was made in error.  Please disregard.  Closing.