[Bug 673708] New: using playbin2 with "fd://" URIs randomly hangs or crashes

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=673708
  GStreamer | gst-plugins-base | 0.10.35

           Summary: using playbin2 with "fd://" URIs randomly hangs or
                    crashes
    Classification: Platform
           Product: GStreamer
           Version: 0.10.35
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: bas at westerbaan.name
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=211559)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=211559)
Example code and media file

The setup is simple:

1. create a playbin2.
2. open an audio file
3. set playbin2's URI to `fd://<fd of opened audio file>'
4. when the `about-to-finish' message is received; open another audio file and
set the URI to `fd://<fd of opened audio file>'
5. when the `playbin2-stream-changed' message is received; close the previous
filedescriptor

One would expect the audio file to be played over and over again without gap.

However, one of the following problems occur:

1. Very common: After a few playbacks (2 or 3 times are common, but 4 - 8 times
also occur), GStreamer hangs.  After the URI is changed the current audio file
is played successfully to the end, but the new audio file is not started.  (
calls to for instance get_property('uri') hang afterwards;  the process is
using ~5% CPU )
2. Occasionally (1/10): the process segfaults or exits without any specific
error message.

Attached is a .tar with an example Python script of the setup along with an
example OGG.

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