[Webkit-unassigned] [Bug 241027] New: Flakes in WebGL conformance[2]/textures/image_bitmap_from_image_bitmap/ tests

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=241027

            Bug ID: 241027
           Summary: Flakes in WebGL
                    conformance[2]/textures/image_bitmap_from_image_bitmap
                    / tests
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kbr at google.com
                CC: dino at apple.com, kbr at google.com, kkinnunen at apple.com

Flakes are seen in the conformance[2]/textures/image_bitmap_from_image_bitmap/ portion of the WebGL 1.0/2.0 conformance tests. Here's an example test build of a PR which didn't touch this code at all:
https://ews-build.webkit.org/#/builders/70/builds/8221

(from https://github.com/WebKit/WebKit/pull/1063 )

Per the test history from one of these tests, webgl/2.0.0/conformance/textures/image_bitmap_from_image_bitmap/tex-2d-rgba-rgba-unsigned_short_5_5_5_1.html :
https://results.webkit.org/?suite=layout-tests&test=webgl%2F2.0.0%2Fconformance%2Ftextures%2Fimage_bitmap_from_image_bitmap%2Ftex-2d-rgba-rgba-unsigned_short_5_5_5_1.html

flakes are seen on the "Big Sur E wk2 Release on Macmini9,1 with arm64" bot as far back as 5/20/2022:
https://build.webkit.org/#/builders/104/builds/8259

and on the "Big Sur E wk2 Release on Macmini8,1 with x86_64" bot also as far back as 5/20/2022:
https://build.webkit.org/#/builders/70/builds/9383

The symptom is that the first couple of ImageBitmaps created from ImageBitmaps, and then uploaded to textures, are black instead of solid red:
https://ews-build.webkit.org/#/builders/70/builds/8221
https://ews-build.s3-us-west-2.amazonaws.com/macOS-BigSur-Release-WK2-Tests-EWS/2e874539-8221/webgl/2.0.0/conformance/textures/image_bitmap_from_image_bitmap/tex-2d-rgba-rgba-unsigned_short_5_5_5_1-pretty-diff.html

This is more likely a bug in the ImageBitmap implementation rather than a bug in ANGLE.

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