[Bug 647759] New: [bin] Element could be removed from the bin but still claim that the bin is the parent

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=647759
  GStreamer | gstreamer (core) | git

           Summary: [bin] Element could be removed from the bin but still
                    claim that the bin is the parent
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: critical
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: slomo at circular-chaos.org
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


There's a race in gst_bin_remove_func(), first the element is removed from the
bin with the bin/element object locks, both are released. Then the element is
unparented. During this short period of time the element still claims that the
bin is the parent.

To prevent race conditions in code that checks if the child is really a child
of the bin it is necessary to take both locks and additionally check the
UNPARENT flag of the child. This should be documented.

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