[Bug 740121] New: Race condition leads to missing ASYNC_DONE bus messages when seeking

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=740121
  GStreamer | gstreamer (core) | 1.4.4

           Summary: Race condition leads to missing ASYNC_DONE bus
                    messages when seeking
    Classification: Platform
           Product: GStreamer
           Version: 1.4.4
        OS/Version: Windows
            Status: UNCONFIRMED
          Severity: blocker
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: alexotheraddress at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


After calling gst_element_send_event to do a flushing seek,
GST_MESSAGE_ASYNC_DONE should be received on the bus.  Usually, this happens,
however sometimes the message is never received.  Enabling a lot of logging
makes this occur much more frequently.  This is a blocker because if an
application does a lot of seeking (such as scrubbing with a slider), and waits
for the ASYNC_DONE message before proceeding, it will eventually deadlock. 
This makes seeking unusable.

I don't think this bug existed with 0.10.

The following bug might have the same underlying cause:
https://bugzilla.gnome.org/show_bug.cgi?id=734060

To reproduce, run the code attached (change line 165 to point to an existing
video of your choice that supports seeking).  It will most likely run to the
end and then crash (proper cleanup code and most error checking has been
removed to prune down the example).  Then run it again with
GST_DEBUG=3,GST_STATES:4,myplugin:9  - this time it will probably deadlock
after 1 seek.

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