[Webkit-unassigned] [Bug 173439] New: Layout Test media/modern-media-controls/buttons-container/buttons-container-constructor.html is a flaky failure.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=173439

            Bug ID: 173439
           Summary: Layout Test
                    media/modern-media-controls/buttons-container/buttons-
                    container-constructor.html is a flaky 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: jlewis3 at apple.com

media/modern-media-controls/buttons-container/buttons-container-constructor.html is a flaky failure on Sierra WK2 Debug, El Capitan WK1 Debug, and iOS Simulator Release WK1 according to the Flakiness Dashboard.

the test was re-baselined and re-enabled with:
https://trac.webkit.org/changeset/217891/webkit

The test seems to have been flaky after additional test were re-enabled and re-baselined:
https://trac.webkit.org/changeset/217941/webkit
https://trac.webkit.org/changeset/217940/webkit
https://trac.webkit.org/changeset/217939/webkit

https://build.webkit.org/results/Apple%20Sierra%20Debug%20WK2%20(Tests)/r218344%20(1568)/results.html
https://build.webkit.org/builders/Apple%20Sierra%20Debug%20WK2%20(Tests)/builds/1568

Diff:
--- /Volumes/Data/slave/sierra-debug-tests-wk2/build/layout-test-results/media/modern-media-controls/buttons-container/buttons-container-constructor-expected.txt
+++ /Volumes/Data/slave/sierra-debug-tests-wk2/build/layout-test-results/media/modern-media-controls/buttons-container/buttons-container-constructor-actual.txt
@@ -1,3 +1,4 @@
+CONSOLE MESSAGE: line 155: TypeError: null is not an object (evaluating 'this._imageSource.src')
 Testing the ButtonsContainer constructor.

 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".

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