[Webkit-unassigned] [Bug 240661] New: [GStreamer] REGRESSION(r288092): Deadlock when the playback is stopping just right after startup

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=240661

            Bug ID: 240661
           Summary: [GStreamer] REGRESSION(r288092): Deadlock when the
                    playback is stopping just right after startup
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bandou.yacine at gmail.com

r288092 causes a deadlock with the "28. ChangeType.H264.VP9" test in "https://ytlr-cert.appspot.com/2020/main.html".

The background thread locks the GStPad and sends a notify::caps signal which is caught by
VideoTrackPrivateGStreamer that calls callOnMainThreadAndWait.

At the same time the main thread destroys MediaPlayerPrivateGStreamer and sets the pipeline to NULL
that calls "gst_pad_set_active" which wants to lock the GStPad.

See https://bugs.webkit.org/show_bug.cgi?id=234084

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