[Bug 744573] New: v4l2allocator: v4l2mem_share() is broken

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=744573

            Bug ID: 744573
           Summary: v4l2allocator: v4l2mem_share() is broken
    Classification: Platform
           Product: GStreamer
           Version: 1.4.5
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: nicolas.dufresne at collabora.co.uk
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Currently it seems that free will unmap the memory even if that memory is a
shared. This lead to crash when buffer is copied and this shared memory
mechanism is triggered. This seems to happen sometimes in master using:

gst-launch-1.0 v4l2src ! image/jpeg ! decodebin ! fakesink

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