[Webkit-unassigned] [Bug 190210] New: REGRESSION: Layout Test compositing/geometry/limit-layer-bounds-opacity-transition.html is flaky

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190210

            Bug ID: 190210
           Summary: REGRESSION: Layout Test
                    compositing/geometry/limit-layer-bounds-opacity-transi
                    tion.html is flaky
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tsavell at apple.com
                CC: lforschler at apple.com

The following layout test is flaky on all platforms

compositing/geometry/limit-layer-bounds-opacity-transition.html

Probable cause:

This test became flakey recently. I was able to reproduce the failure using run-webkit-tests --root testbuild-236502 compositing/geometry/limit-layer-bounds-opacity-transition.html --iterations 500 -f 

I ran this on Mojave. This gave me a range of possible revisions for the regression between 236497-236502. Looking at the revisions I think either 236500 or 236501 are at fault but I am not sure. 

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=compositing%2Fgeometry%2Flimit-layer-bounds-opacity-transition.html

Diff:
--- /Volumes/Data/slave/sierra-debug-tests-wk1/build/layout-test-results/compositing/geometry/limit-layer-bounds-opacity-transition-expected.txt
+++ /Volumes/Data/slave/sierra-debug-tests-wk1/build/layout-test-results/compositing/geometry/limit-layer-bounds-opacity-transition-actual.txt
@@ -7,7 +7,7 @@
     (GraphicsLayer
       (bounds 800.00 600.00)
       (contentsOpaque 1)
-      (children 2
+      (children 3
         (GraphicsLayer
           (position 8.00 8.00)
           (anchor 1.00 1.00)
@@ -18,6 +18,12 @@
           (bounds 108.00 99.00)
           (drawsContent 1)
         )
+        (GraphicsLayer
+          (position 8.00 109.00)
+          (bounds 784.00 18.00)
+          (opacity 0.00)
+          (drawsContent 1)
+        )
       )
     )
   )

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