Index: gst1.0-fsl-plugins-4.0.3/plugins/overlay_sink/compositor.c
===================================================================
--- gst1.0-fsl-plugins-4.0.3.orig/plugins/overlay_sink/compositor.c
+++ gst1.0-fsl-plugins-4.0.3/plugins/overlay_sink/compositor.c
@@ -278,6 +278,7 @@ static gpointer compositor_compositing_t
 {
   CompositorHandle *hcompositor = (CompositorHandle*) compositor;

+  g_mutex_lock(&hcompositor->lock);
   while (hcompositor->running) {
     COMPOSITOR_WAIT_SURFACE (hcompositor);
     compositor_do_compositing_surface_list (hcompositor);