[Webkit-unassigned] [Bug 196400] New: [ Mac WK2 ] Layout Test fast/mediastream/MediaStreamTrack-getSettings.html is a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=196400

            Bug ID: 196400
           Summary: [ Mac WK2 ] Layout Test
                    fast/mediastream/MediaStreamTrack-getSettings.html is
                    a flaky failure
           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: sroberts at apple.com
                CC: lforschler at apple.com

The following layout test is flaky on Mac WK2 Release and Debug

fast/mediastream/MediaStreamTrack-getSettings.html

Probable cause:

Test has been flaky on the dashboard for the entire available history. 

After changes in https://trac.webkit.org/changeset/243094/webkit I was able to reproduce locally.

Testing locally I got it to fail consistently up until r243094. Prior to 243092 it passes locally, but obviously it fails on the bots prior to the change. I don't know if the timing changes in 243094 have allowed the test to fail locally.

Reproduced with:

run-webkit-tests fast/mediastream/MediaStreamTrack-getSettings.html --iterations 3000 -fg

Using -fg it has about a 15% failure rate locally. If I do it with just 1 child process and -g it fails about 2 in 3000 iterations. 

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=fast%2Fmediastream%2FMediaStreamTrack-getSettings.html

Diff:

--- /Volumes/Data/slave/mojave-release-tests-wk2/build/layout-test-results/fast/mediastream/MediaStreamTrack-getSettings-expected.txt
+++ /Volumes/Data/slave/mojave-release-tests-wk2/build/layout-test-results/fast/mediastream/MediaStreamTrack-getSettings-actual.txt
@@ -13,7 +13,7 @@
 audio track settings:
   settings.deviceId = <UUID>
   settings.echoCancellation = false
-  settings.sampleRate = 44100
+  settings.sampleRate = 0
   settings.volume = 1

 According to the spec: "[every setting] MUST be a member of the set defined for that property by getCapabilities()"

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