Bug 201588

Summary: Flaky Test: imported/w3c/web-platform-tests/html/semantics/embedded-content/media-elements/ready-states/autoplay-with-slow-text-tracks.html
Product: WebKit Reporter: WebKit Commit Bot <commit-queue>
Component: Tools / TestsAssignee: WebKit Commit Bot <commit-queue>
Status: NEW ---    
Severity: Normal CC: eric.carlson, jer.noble, webkit-bot-watchers-bugzilla, youennf
Priority: P2    
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
See Also: https://bugs.webkit.org/show_bug.cgi?id=176929
Bug Depends on:    
Bug Blocks: 50856    
Attachments:
Description Flags
Archive of layout-test-results from webkit-cq-01 none

Description WebKit Commit Bot 2019-09-07 22:22:46 PDT
This is an automatically generated bug from the commit-queue.
imported/w3c/web-platform-tests/html/semantics/embedded-content/media-elements/ready-states/autoplay-with-slow-text-tracks.html has been flaky on the commit-queue.

imported/w3c/web-platform-tests/html/semantics/embedded-content/media-elements/ready-states/autoplay-with-slow-text-tracks.html was authored by youennf@gmail.com.
https://trac.webkit.org/browser/trunk/LayoutTests/imported/w3c/web-platform-tests/html/semantics/embedded-content/media-elements/ready-states/autoplay-with-slow-text-tracks.html

The commit-queue just saw imported/w3c/web-platform-tests/html/semantics/embedded-content/media-elements/ready-states/autoplay-with-slow-text-tracks.html flake (text diff) while processing attachment 378311 [details] on bug 201584.
Bot: webkit-cq-01  Port: <class 'webkitpy.common.config.ports.MacPort'>  Platform: Mac OS X 10.13.6

The bots will update this with information from each new failure.

If you believe this bug to be fixed or invalid, feel free to close.  The bots will re-open if the flake re-occurs.

If you would like to track this test fix with another bug, please close this bug as a duplicate.  The bots will follow the duplicate chain when making future comments.
Comment 1 WebKit Commit Bot 2019-09-07 22:22:48 PDT
Created attachment 378319 [details]
Archive of layout-test-results from webkit-cq-01
Comment 2 Alexey Proskuryakov 2019-09-10 08:58:36 PDT
This test has been very flaky on macOS Mojave for a long time, see bug 176929. Failures on High Sierra aren't new either, but post-commit bots only see them on WebKit1 or GuardMalloc bots, not on Release WebKit2 like here.

The diff appears to always be the same though.

@@ -1,4 +1,3 @@
-CONSOLE MESSAGE: line 31: TypeError: null is not an object (evaluating 'track.track.cues.length')
 CONSOLE MESSAGE: line 31: TypeError: null is not an object (evaluating 'track.track.cues.length')
 CONSOLE MESSAGE: line 31: TypeError: null is not an object (evaluating 'track.track.cues.length')
 CONSOLE MESSAGE: line 31: TypeError: null is not an object (evaluating 'track.track.cues.length')