[Bug 796737] New: ASYNC_DONE message is dropped leading to hanging application

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796737

            Bug ID: 796737
           Summary: ASYNC_DONE message is dropped leading to hanging
                    application
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: Joakim.Johansson at axis.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 372914
  --> https://bugzilla.gnome.org/attachment.cgi?id=372914&action=edit
Problem with ASYNC_DONE

The ASYNC_DONE message is dropped in gstbin in this scenario. (for more
detailed information, see attached sequence)

If change_state is executing at the same time as ASYNC_START is received then
is the "polling" flag indicating that gstbin is busy with a state change and
the PENDING state is not set but the ASYNC_START message is posted.

But when the ASYNC_DONE is handled, then is pending == VOID_PENDING (initial
value received when creating the pipeline) and the ASYNC_DONE is dropped
leaving the application hanging.

This might be the same problem as reported in #740121 and I don't have a
solution for the problem that is working.

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