227237 – [BigSur Wk1] imported/w3c/web-platform-tests/css/css-will-change/will-change* tests are flaky failing

Bug 227237 - [BigSur Wk1] imported/w3c/web-platform-tests/css/css-will-change/will-change* tests are flaky failing

Summary: [BigSur Wk1] imported/w3c/web-platform-tests/css/css-will-change/will-change*...

Status:	NEW

Alias:	None

Product:	WebKit
Classification:	Unclassified
Component:	New Bugs (show other bugs)
Version:	WebKit Nightly Build
Hardware:	Unspecified Unspecified

Importance:	P2 Normal
Assignee:	Nobody

URL:
Keywords:	InRadar

Depends on:
Blocks:

Reported:	2021-06-21 14:50 PDT by Amir Mark Jr
Modified:	2021-06-28 13:52 PDT (History)
CC List:	2 users (show)

See Also:	226307 225704

Attachments
will-change-stacking-context-opacity-1-diff (2.51 KB, image/png) 2021-06-21 14:54 PDT, Amir Mark Jr	no flags	Details
will-change-stacking-context-filter-1-diff (4.04 KB, image/png) 2021-06-21 14:54 PDT, Amir Mark Jr	no flags	Details
will-change-fixpos-cb-filter-1-diff (3.88 KB, image/png) 2021-06-21 14:55 PDT, Amir Mark Jr	no flags	Details
View All Add an attachment (proposed patch, testcase, etc.)

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Description Amir Mark Jr 2021-06-21 14:50:37 PDT

imported/w3c/web-platform-tests/css/css-will-change/will-change-fixpos-cb-filter-1.html
imported/w3c/web-platform-tests/css/css-will-change/will-change-stacking-context-filter-1.html
imported/w3c/web-platform-tests/css/css-will-change/will-change-stacking-context-opacity-1.html

Are flaky image failures on Big Sur Wk1 Release, Apple Silicon Wk1 Release and Debug.


History:

https://results.webkit.org/?suite=layout-tests&suite=layout-tests&suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fcss%2Fcss-will-change%2Fwill-change-fixpos-cb-filter-1.html&test=imported%2Fw3c%2Fweb-platform-tests%2Fcss%2Fcss-will-change%2Fwill-change-stacking-context-filter-1.html&test=imported%2Fw3c%2Fweb-platform-tests%2Fcss%2Fcss-will-change%2Fwill-change-stacking-context-opacity-1.html


Image Failure:

https://build.webkit.org/results/Apple-BigSur-Release-WK1-Tests/r279076%20(3548)/imported/w3c/web-platform-tests/css/css-will-change/will-change-fixpos-cb-filter-1-diff.png
https://build.webkit.org/results/Apple-BigSur-Release-WK1-Tests/r279076%20(3548)/imported/w3c/web-platform-tests/css/css-will-change/will-change-stacking-context-filter-1-diff.png
https://build.webkit.org/results/Apple-BigSur-Release-WK1-Tests/r279076%20(3548)/imported/w3c/web-platform-tests/css/css-will-change/will-change-stacking-context-opacity-1-diff.png

Comment 1 Radar WebKit Bug Importer 2021-06-21 14:51:06 PDT

<rdar://problem/79581733>

Comment 2 Amir Mark Jr 2021-06-21 14:54:01 PDT

Created attachment 431912 [details]
will-change-stacking-context-opacity-1-diff

Comment 3 Amir Mark Jr 2021-06-21 14:54:31 PDT

Created attachment 431913 [details]
will-change-stacking-context-filter-1-diff

Comment 4 Amir Mark Jr 2021-06-21 14:55:15 PDT

Created attachment 431914 [details]
will-change-fixpos-cb-filter-1-diff

Comment 5 Amir Mark Jr 2021-06-21 15:02:48 PDT

It appears these tests have been flaky since being introduced around r277375, not a clear regression point.

Comment 6 Amir Mark Jr 2021-06-21 17:06:07 PDT

Updated test expectations:

https://trac.webkit.org/changeset/279092/webkit

Comment 7 Ryan Haddad 2021-06-28 13:52:14 PDT

Looking at the results in https://build.webkit.org/results/Apple-BigSur-Release-WK1-Tests/r279076%20(3548)/results.html, the "actual" image is all gray or white.