[Webkit-unassigned] [Bug 215450] New: [ macOS ] imported/w3c/web-platform-tests/media-source/mediasource-changetype-play-negative.html is a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=215450

            Bug ID: 215450
           Summary: [ macOS ]
                    imported/w3c/web-platform-tests/media-source/mediasour
                    ce-changetype-play-negative.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: hector_i_lopez at apple.com

imported/w3c/web-platform-tests/media-source/mediasource-changetype-play-negative.html

Test is a flaky failure according to history on macOS. The first occurrence of failure was at r264379. That occurrence happens on the same day as resync https://trac.webkit.org/changeset/264345/webkit

History:
https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fmedia-source%2Fmediasource-changetype-play-negative.html&limit=50000&platform=mac

Diff:
--- /Volumes/Data/slave/catalina-debug-tests-wk1/build/layout-test-results/imported/w3c/web-platform-tests/media-source/mediasource-changetype-play-negative-expected.txt
+++ /Volumes/Data/slave/catalina-debug-tests-wk1/build/layout-test-results/imported/w3c/web-platform-tests/media-source/mediasource-changetype-play-negative-actual.txt
@@ -1,3 +1,5 @@
+
+Harness Error (TIMEOUT), message = null

 PASS Check if browser supports enough test media types across audio and video for changeType negative tests 
 PASS Negative test audio<->video changeType for audio/mp4; codecs="mp4a.40.2" <-> video/mp4; codecs="avc1.4D4001" 
@@ -8,7 +10,7 @@
 PASS Negative test video<->audio changeType for video/mp4; codecs="avc1.4D4001" <-> audio/mp4; codecs="mp4a.40.2" (using types without codecs parameters) 
 PASS Negative test audio<->video implicit changeType for audio/mp4; codecs="mp4a.40.2" <-> video/mp4; codecs="avc1.4D4001" (without codecs parameters for addSourceBuffer) 
 PASS Negative test video<->audio implicit changeType for video/mp4; codecs="avc1.4D4001" <-> audio/mp4; codecs="mp4a.40.2" (without codecs parameters for addSourceBuffer) 
-FAIL Negative test audio<->video changeType for audio/mpeg <-> video/mp4; codecs="avc1.4D4001" assert_unreached: Received 'ended' while negative testing. Reached unreachable code
+TIMEOUT Negative test audio<->video changeType for audio/mpeg <-> video/mp4; codecs="avc1.4D4001" Test timed out
 FAIL Negative test video<->audio changeType for video/mp4; codecs="avc1.4D4001" <-> audio/mpeg assert_unreached: Received 'ended' while negative testing. Reached unreachable code
 FAIL Negative test audio<->video changeType for audio/mpeg <-> video/mp4; codecs="avc1.4D4001" (using types without codecs parameters) assert_unreached: Received 'ended' while negative testing. Reached unreachable code
 FAIL Negative test video<->audio changeType for video/mp4; codecs="avc1.4D4001" <-> audio/mpeg (using types without codecs parameters) assert_unreached: Received 'ended' while negative testing. Reached unreachable code

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