[Webkit-unassigned] [Bug 240654] New: REGRESSION (r294452): [ iOS ] ImageBufferIOSurfaceBackend - nine tests are a consistent image failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=240654

            Bug ID: 240654
           Summary: REGRESSION (r294452): [ iOS ]
                    ImageBufferIOSurfaceBackend - nine tests are a
                    consistent image 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:
fast/css/paint-order-shadow.html
fast/forms/ios/focus-ring-size.html
fast/inline/hidpi-outline-auto-negative-offset-with-border-radius.html
fast/inline/hidpi-outline-auto-with-border-radius-horizontal-ltr.html
fast/inline/hidpi-outline-auto-with-border-radius-horizontal-rtl.html
fast/inline/hidpi-outline-auto-with-border-radius-vertical-ltr.html
fast/inline/hidpi-outline-auto-with-border-radius-vertical-rtl.html
fast/inline/hidpi-outline-auto-with-fractional-radius.html
fast/inline/hidpi-outline-auto-with-one-focusring-rect.html

The first failure I saw on the dashboard was on 5/18/2022 at r294452.  The seven fast/inline/hidpi-outline-auto tests have a blank expected image, fast/css/paint-order-shadow.html has a blank actual image, and fast/forms/ios/focus-ring-size.html has both an expected and actual image.

REPRODUCTION STEPS
I can reproduce this on r294452, but unable to reproduce it on r294451 or earlier.

Command: 
run-webkit-tests --root 294452 --ios-simulator --exit-after-n-failures 1 --exit-after-n-crashes-or-timeouts 1 --iterations 50 --no-retry fast/inline/hidpi-outline-auto-negative-offset-with-border-radius.html

Result: 
Regressions: Unexpected image-only failures (1)
  fast/inline/hidpi-outline-auto-negative-offset-with-border-radius.html [ ImageOnlyFailure ]

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&test=fast%2Finline%2Fhidpi-outline-auto-negative-offset-with-border-radius.html&test=fast%2Finline%2Fhidpi-outline-auto-with-border-radius-horizontal-ltr.html&test=fast%2Finline%2Fhidpi-outline-auto-with-border-radius-horizontal-rtl.html&test=fast%2Finline%2Fhidpi-outline-auto-with-border-radius-vertical-ltr.html&test=fast%2Finline%2Fhidpi-outline-auto-with-border-radius-vertical-rtl.html&test=fast%2Finline%2Fhidpi-outline-auto-with-fractional-radius.html&test=fast%2Finline%2Fhidpi-outline-auto-with-one-focusring-rect.html&platform=ios&limit=50000

Image Diff:
fast/inline/hidpi-outline-auto-negative-offset-with-border-radius.html
https://build.webkit.org/results/Apple-iOS-15-Simulator-Debug-WK2-Tests/250732%40main%20(2603)/fast/forms/ios/focus-ring-size-diffs.html

fast/inline/hidpi-outline-auto-with-border-radius-horizontal-ltr.html
https://build.webkit.org/results/Apple-iOS-15-Simulator-Debug-WK2-Tests/250732%40main%20(2603)/fast/inline/hidpi-outline-auto-negative-offset-with-border-radius-diffs.html

fast/inline/hidpi-outline-auto-with-border-radius-horizontal-rtl.html
https://build.webkit.org/results/Apple-iOS-15-Simulator-Debug-WK2-Tests/250732%40main%20(2603)/fast/inline/hidpi-outline-auto-with-border-radius-horizontal-rtl-diffs.html

fast/inline/hidpi-outline-auto-with-border-radius-vertical-ltr.html
https://build.webkit.org/results/Apple-iOS-15-Simulator-Debug-WK2-Tests/250732%40main%20(2603)/fast/inline/hidpi-outline-auto-with-border-radius-vertical-ltr-diffs.html

fast/inline/hidpi-outline-auto-with-border-radius-vertical-rtl.html
https://build.webkit.org/results/Apple-iOS-15-Simulator-Debug-WK2-Tests/250732%40main%20(2603)/fast/inline/hidpi-outline-auto-with-border-radius-vertical-rtl-diffs.html

fast/inline/hidpi-outline-auto-with-fractional-radius.html
https://build.webkit.org/results/Apple-iOS-15-Simulator-Debug-WK2-Tests/250732%40main%20(2603)/fast/inline/hidpi-outline-auto-with-fractional-radius-diffs.html

fast/inline/hidpi-outline-auto-with-one-focusring-rect.html
https://build.webkit.org/results/Apple-iOS-15-Simulator-Debug-WK2-Tests/250732%40main%20(2603)/fast/inline/hidpi-outline-auto-with-one-focusring-rect-diffs.html

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