[Webkit-unassigned] [Bug 187557] New: [ MacOS WK1 ] Layout Tests in media/media-fragments/ are flaky

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=187557

            Bug ID: 187557
           Summary: [ MacOS WK1 ] Layout Tests in media/media-fragments/
                    are 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 tests are flaky on MacOS WK1 in:

media/media-fragments/

Probable cause:

All the tests have been flaky for quite some time. They are highly intermittent and all fail in very similar ways. 

Example of failure output:
--- /Volumes/Data/slave/highsierra-debug-tests-wk1/build/layout-test-results/media/media-fragments/TC0078-expected.txt
+++ /Volumes/Data/slave/highsierra-debug-tests-wk1/build/layout-test-results/media/media-fragments/TC0078-actual.txt
@@ -7,6 +7,6 @@
 EXPECTED (video.currentTime == '3') OK
 RUN(video.play())
 EVENT(pause)
-EXPECTED (video.currentTime - fragmentEndTime <= '0.5') OK
+EXPECTED (video.currentTime - fragmentEndTime <= '0.5'), OBSERVED '0.66' FAIL
 END OF TEST


Flakiness Dashboard:

http://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=media%2Fmedia-fragments%2F

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