==1048== Invalid read of size 8
==1048==    at 0xAB430E8: gdk_event_apply_filters (gdkeventsource.c:82)
==1048==    by 0xAB433E5: gdk_event_source_translate_event (gdkeventsource.c:205)
==1048==    by 0xAB433E5: _gdk_x11_display_queue_events (gdkeventsource.c:341)
==1048==    by 0xAB0D30F: gdk_display_get_event (gdkdisplay.c:438)
==1048==    by 0xAB43171: gdk_event_source_dispatch (gdkeventsource.c:363)
==1048==    by 0x7490A56: g_main_context_dispatch (in /usr/lib/libglib-2.0.so.0.5200.3)
==1048==    by 0x7490C87: ??? (in /usr/lib/libglib-2.0.so.0.5200.3)
==1048==    by 0x7490FA1: g_main_loop_run (in /usr/lib/libglib-2.0.so.0.5200.3)
==1048==    by 0x5D267BB: meta_run (main.c:648)
==1048==    by 0x109F3B: main (in /usr/bin/gnome-shell)
==1048==  Address 0x48c4eb88 is 8 bytes inside a block of size 24 free'd
==1048==    at 0x4C2E14B: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==1048==    by 0xAB21B95: _gdk_event_filter_unref (gdkwindow.c:1934)
==1048==    by 0xAB2AF6A: window_remove_filters (gdkwindow.c:1942)
==1048==    by 0xAB2AF6A: _gdk_window_destroy_hierarchy (gdkwindow.c:2148)
==1048==    by 0xAB4FD29: gdk_x11_window_destroy_notify (gdkwindow-x11.c:1401)
==1048==    by 0x63A647C: gtk_socket_filter_func (gtksocket.c:1476)
==1048==    by 0xAB430DE: gdk_event_apply_filters (gdkeventsource.c:79)
==1048==    by 0xAB433E5: gdk_event_source_translate_event (gdkeventsource.c:205)
==1048==    by 0xAB433E5: _gdk_x11_display_queue_events (gdkeventsource.c:341)
==1048==    by 0xAB0D30F: gdk_display_get_event (gdkdisplay.c:438)
==1048==    by 0xAB43171: gdk_event_source_dispatch (gdkeventsource.c:363)
==1048==    by 0x7490A56: g_main_context_dispatch (in /usr/lib/libglib-2.0.so.0.5200.3)
==1048==    by 0x7490C87: ??? (in /usr/lib/libglib-2.0.so.0.5200.3)
==1048==    by 0x7490FA1: g_main_loop_run (in /usr/lib/libglib-2.0.so.0.5200.3)
==1048==    by 0x5D267BB: meta_run (main.c:648)
==1048==    by 0x109F3B: main (in /usr/bin/gnome-shell)
==1048==  Block was alloc'd at
==1048==    at 0x4C2CE5F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==1048==    by 0x7496028: g_malloc (in /usr/lib/libglib-2.0.so.0.5200.3)
==1048==    by 0x74ADB25: g_slice_alloc (in /usr/lib/libglib-2.0.so.0.5200.3)
==1048==    by 0x748CA33: g_list_append (in /usr/lib/libglib-2.0.so.0.5200.3)
==1048==    by 0xAB2BD57: gdk_window_add_filter (gdkwindow.c:2658)
==1048==    by 0x63A5A94: gtk_socket_add_window (gtksocket.c:1128)
==1048==    by 0x4EA23E8: ??? (in /usr/lib/gnome-shell/libgnome-shell.so)
==1048==    by 0xAB430DE: gdk_event_apply_filters (gdkeventsource.c:79)
==1048==    by 0xAB433E5: gdk_event_source_translate_event (gdkeventsource.c:205)
==1048==    by 0xAB433E5: _gdk_x11_display_queue_events (gdkeventsource.c:341)
==1048==    by 0xAB0D30F: gdk_display_get_event (gdkdisplay.c:438)
==1048==    by 0xAB43171: gdk_event_source_dispatch (gdkeventsource.c:363)
==1048==    by 0x7490A56: g_main_context_dispatch (in /usr/lib/libglib-2.0.so.0.5200.3)
==1048==    by 0x7490C87: ??? (in /usr/lib/libglib-2.0.so.0.5200.3)
==1048==    by 0x7490FA1: g_main_loop_run (in /usr/lib/libglib-2.0.so.0.5200.3)
==1048==    by 0x5D267BB: meta_run (main.c:648)
==1048==    by 0x109F3B: main (in /usr/bin/gnome-shell)
==1048== 
==1048== (action on error) vgdb me ... 
==1048== Continuing ...