Steps to reproduce:
1. Write a sample application having two windows. Create the second window from first window. Destroy the second window.
2. Memory allocated to second window upon creation is not getting freed but accumulates when second window is destroyed. 
3. Platform - GTK+ 2.12.2 over DirectFB 1.1.1 over TI DaVinci on MontaVista Linux


Stack trace:


Other information:
This is observed only in DirectFB backend but not in X window backed. Memory accumulates and eventually program crashes.

sample program that shows memory leak:

#include <gtk/gtk.h>

GtkWidget*
create_window1 (GtkWidget *);

GtkWidget*
create_window2 (void);

void
on_open_clicked                        (GtkButton       *button,
                                        gpointer         user_data)
{
	/* open a pop-up window */
	GtkWidget *window2 = create_window2 ();
	gtk_widget_show(window2);

}


void
on_close_clicked                       (GtkButton       *button,
                                        gpointer         user_data)
{
	GtkWidget *window = GTK_WIDGET(user_data);
	gtk_widget_destroy(window);

}


GtkWidget*
create_window1 (GtkWidget *window2)
{
  GtkWidget *window1;
  GtkWidget *fixed1;
  GtkWidget *open;
  GtkWidget *close;

  window1 = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_widget_set_size_request (window1, 640, 480);
  gtk_window_set_title (GTK_WINDOW (window1), "window1");

  fixed1 = gtk_fixed_new ();
  gtk_widget_show (fixed1);
  gtk_container_add (GTK_CONTAINER (window1), fixed1);

  open = gtk_button_new_with_mnemonic ("open");
  gtk_widget_show (open);
  gtk_fixed_put (GTK_FIXED (fixed1), open, 208, 200);
  gtk_widget_set_size_request (open, 64, 40);

  close = gtk_button_new_with_mnemonic ("close");
  gtk_widget_show (close);
  gtk_fixed_put (GTK_FIXED (fixed1), close, 296, 200);
  gtk_widget_set_size_request (close, 72, 40);

  /* send pointer to window1 to callback function */

  g_signal_connect ((gpointer) open, "clicked",
                    G_CALLBACK (on_open_clicked),
                    window2);
  g_signal_connect ((gpointer) close, "clicked",
                    G_CALLBACK (on_close_clicked),
                    window1);

  return window1;
}

GtkWidget*
create_window2 (void)
{
  GtkWidget *window2;
  GtkWidget *fixed2;
  GtkWidget *close;

  window2 = gtk_window_new (GTK_WINDOW_POPUP);
  gtk_widget_set_size_request (window2, 320, 240);
  gtk_window_set_title (GTK_WINDOW (window2), "window2");

  fixed2 = gtk_fixed_new ();
  gtk_widget_show (fixed2);
  gtk_container_add (GTK_CONTAINER (window2), fixed2);

  close = gtk_button_new_with_mnemonic ("close");
  gtk_widget_show (close);
  gtk_fixed_put (GTK_FIXED (fixed2), close, 144, 112);
  gtk_widget_set_size_request (close, 80, 48);

  g_signal_connect ((gpointer) close, "clicked",
                    G_CALLBACK (on_close_clicked),
                    window2);

  return window2;
}


int
main (int argc, char *argv[])
{
  GtkWidget *window1;
  gtk_init (&argc, &argv);

  /* create top window*/
  window1 = create_window1 (window2);
  gtk_widget_show (window1);
  g_signal_connect ((gpointer) window1, "destroy", G_CALLBACK(gtk_main_quit),
                    NULL);

  gtk_main ();

  return 0;
}