[Webkit-unassigned] [Bug 288888] New: REGRESSION(284617 at main?): [ iOS arm64 ] compositing/contents-format/deep-color-backing-store.html is a constant failure.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=288888

            Bug ID: 288888
           Summary: REGRESSION(284617 at main?): [ iOS arm64 ]
                    compositing/contents-format/deep-color-backing-store.h
                    tml is a constant failure.
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Compositing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: y_karimi at apple.com
                CC: simon.fraser at apple.com,
                    webkit-bot-watchers-bugzilla at group.apple.com,
                    webkit-bug-importer at group.apple.com

compositing/contents-format/deep-color-backing-store.html 

This test is a constant failure on iOS wk2 on iPhone 12 with arm64.

HISTORY:

https://results.webkit.org/?suite=layout-tests&test=compositing%2Fcontents-format%2Fdeep-color-backing-store.html

TEXT DIFF:

@@ -3,7 +3,6 @@
 (GraphicsLayer
   (anchor 0.00 0.00)
   (bounds 5018.00 2018.00)
-  (deep color 1)
   (children 1
     (GraphicsLayer
       (bounds 5018.00 2018.00)
@@ -12,14 +11,12 @@
       (tile size 512 x 512)
       (top left tile 0, 0 tiles grid 2 x 2)
       (in window 1)
-      (deep color 1)
       (children 2
         (GraphicsLayer
           (position 18.00 10.00)
           (bounds 100.00 100.00)
           (contentsOpaque 1)
           (drawsContent 1)
-          (deep color 1)
         )
         (GraphicsLayer
           (position 18.00 120.00)
@@ -31,7 +28,6 @@
           (tile size 512 x 512)
           (top left tile 0, 0 tiles grid 2 x 1)
           (in window 1)
-          (deep color 1)
         )
       )
     )

DIFF URL:

https://build.webkit.org/results/Apple-iOS-18-Simulator-Release-WK2-Tests/291358@main%20(871)/compositing/contents-format/deep-color-backing-store-pretty-diff.html

REPRODUCIBILITY:

I was able to reproduce this issue on the iOS 18.2 simulator at ToT using the following command:

run-webkit-tests --ios-simulator --child-processes 2 -f compositing/contents-format/deep-color-backing-store.html --iterations 5

REGRESSION:

According to the results dashboard and contextual information, the probable regression point is 284617 at main. The code paths changed in this commit appear to be related to the observed regression test failure.

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