[Webkit-unassigned] [Bug 245613] New: REGRESSION (253865 at main): [ iOS ] scrollingcoordinator/ios/fixed-in-frame-layer-reconcile-layer-position.html is a consistent failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=245613

            Bug ID: 245613
           Summary: REGRESSION (253865 at main): [ iOS ]
                    scrollingcoordinator/ios/fixed-in-frame-layer-reconcil
                    e-layer-position.html is a consistent 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:
scrollingcoordinator/ios/fixed-in-frame-layer-reconcile-layer-position.html

This iOS consistent failure only happens on the iPad (5th generation) model.  The first failure I saw on the dashboard was on 8/27/2022 at 253870 at main.  As I look at the commits in the range, 253865 at main has to do with scrolling and is most likely the cause of the regression.  

Reproduction steps:
I can reproduce this on 253865 at main but cannot reproduce it on 253864 at main or earlier.

Command: 
run-webkit-tests --ipad-simulator --model 'iPad (5th generation)' --release --exit-after-n-failures 1 --exit-after-n-crashes-or-timeouts 1 --iterations 50 --no-retry scrollingcoordinator/ios/fixed-in-frame-layer-reconcile-layer-position.html

Result: 
Regressions: Unexpected text-only failures (1)
  scrollingcoordinator/ios/fixed-in-frame-layer-reconcile-layer-position.html [ Failure ]

History:
https://results.webkit.org/?suite=layout-tests&test=scrollingcoordinator%2Fios%2Ffixed-in-frame-layer-reconcile-layer-position.html&limit=50000&model=iPad%20(5th%20generation)

Diff:
--- /Volumes/Data/worker/Apple-iPadOS-16-Simulator-Release-WK2-Tests/build/layout-test-results/scrollingcoordinator/ios/fixed-in-frame-layer-reconcile-layer-position-expected.txt
+++ /Volumes/Data/worker/Apple-iPadOS-16-Simulator-Release-WK2-Tests/build/layout-test-results/scrollingcoordinator/ios/fixed-in-frame-layer-reconcile-layer-position-actual.txt
@@ -31,8 +31,13 @@
                               (children 1
                                 (GraphicsLayer
                                   (position 8.00 10.00)
-                                  (bounds 200.00 140.00)
-                                  (contentsOpaque 1)
+                                  (preserves3D 1)
+                                  (children 1
+                                    (GraphicsLayer
+                                      (bounds 200.00 140.00)
+                                      (contentsOpaque 1)
+                                    )
+                                  )
                                 )
                               )
                             )

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