[Bug 758584] New: gstbin: deadlock on state change?

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=758584

            Bug ID: 758584
           Summary: gstbin: deadlock on state change?
    Classification: Platform
           Product: GStreamer
           Version: 1.6.0
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: mariusz.buras at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 316152
  --> https://bugzilla.gnome.org/attachment.cgi?id=316152&action=edit
gdb session demonstrating the problem

In my dynamically constructed pipeline I'm seeing a deadlock as seen in the
attachment. I've started seeing this problem after simplifying my pipeline
slightly but otherwise it has the same logical structure apart from one bin I
have removed (now uridecodebin and decodebin are wrapped in a single bin while
previously these lived in separate bins). This suggests to me there's a race
somewhere resulting in a deadlock.

I'd appreciate if someone could have a look at the gdb dump attached. I wonder
if this is a user error, new/wrong use case or a genuine problem with GstBin.

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