#0  pgm_gl_image_dispose (object=0x5a0f6f0) at pgmglimage.c:751
	gldrawable = (PgmGlDrawable *) 0x5a0f6f0
	glviewport = (PgmGlViewport *) 0x0
	glimage = (PgmGlImage *) 0x5a0f6f0
	master = (PgmImage *) 0x0
	task = <value optimized out>
	slave = <value optimized out>
	walk = <value optimized out>
#1  0x00007f5f076436fa in g_object_unref (_object=<value optimized out>)
    at /build/buildd/glib2.0-2.25.11/gobject/gobject.c:2541
	object = (GObject *) 0x5a0f6f0
	old_ref = 1
	__PRETTY_FUNCTION__ = "g_object_unref"
#2  0x00007f5ef85de4f3 in render_layer (layer=0x7f5ee4180d40)
    at pgmcontext.c:967
	gldrawable = (PgmGlDrawable *) 0x5a0f6f0
	walk = (GList *) 0x3119080
#3  0x00007f5ef85de591 in render (context=<value optimized out>)
    at pgmcontext.c:989
	near_layer = (GList *) 0x0
	middle_layer = (GList *) 0x0
	far_layer = (GList *) 0x7f5ee4180d40
	glviewport = (PgmGlViewport *) 0x3477000
#4  0x00007f5ef85dea03 in update_cb (data=0x3478080) at pgmcontext.c:1153
No locals.
#5  0x00007f5f06f85cfb in g_timeout_dispatch (source=0x9157440, 
    callback=0x3147a00, user_data=0x0)
    at /build/buildd/glib2.0-2.25.11/glib/gmain.c:3555
No locals.
#6  0x00007f5f06f85522 in g_main_context_dispatch (context=0x3476bf0)
    at /build/buildd/glib2.0-2.25.11/glib/gmain.c:2119
No locals.
#7  0x00007f5f06f89488 in g_main_context_iterate (context=0x3476bf0, 
    block=<value optimized out>, dispatch=<value optimized out>, 
    self=<value optimized out>)
    at /build/buildd/glib2.0-2.25.11/glib/gmain.c:2750
	max_priority = 0
	timeout = 0
	some_ready = 1
	nfds = 3
	allocated_nfds = 117007280
	fds = <value optimized out>
	__PRETTY_FUNCTION__ = "g_main_context_iterate"
#8  0x00007f5f06f89995 in g_main_loop_run (loop=0x34809f0)
    at /build/buildd/glib2.0-2.25.11/glib/gmain.c:2958
	self = (GThread *) 0x3476f20
	__PRETTY_FUNCTION__ = "g_main_loop_run"
#9  0x00007f5ef85e04ec in render_loop (data=<value optimized out>)
    at pgmcontext.c:1460
	context = (PgmContext *) 0x3478080
	env_var = (const gchar *) 0x0
	source = <value optimized out>
	__FUNCTION__ = "render_loop"
#10 0x00007f5f06faec14 in g_thread_create_proxy (data=0x3476f20)
    at /build/buildd/glib2.0-2.25.11/glib/gthread.c:1897
	__PRETTY_FUNCTION__ = "g_thread_create_proxy"
#11 0x00007f5f0914f981 in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#12 0x00007f5f08023d6d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
No locals.
#13 0x0000000000000000 in ?? ()
No symbol table info available.