[gstreamer-bugs] [Bug 572577] New: [playbin2] deadlock on shutdown

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-plugins-base | Ver: git
           Summary: [playbin2] deadlock on shutdown
           Product: GStreamer
           Version: git
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: manauw at skynet.be
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: Unspecified
   GNOME milestone: Unspecified


Consider a playbin2 pipeline that is set to PAUSED, and (about) immediately
upon return from set_state set to READY, then a race occurs between the
(mainloop) thread trying to shutdown to READY, and streaming thread callbacks
building the bin and prerolling to PAUSED.

In particular, with an internal decodebin2 not yet linked to downstream
elements, mainloop may choose to move decodebin2 elements to READY first, and
then tries to acquire STREAM_LOCK as part of pad deactivation.
In the meantime, streaming thread may then link decodebin2 to downstream
elements, resume streaming and waiting prerolled for a state change.

A state change will not come as the mainloop is occupied trying to get the
STREAM_LOCK, which it will not get as streaming is stuck PAUSED.


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