#0  g_type_check_instance_cast (type_instance=type_instance@entry=0x7f0238c31030, iface_type=139647518830528) at /build/buildd/glib2.0-2.37.3/./gobject/gtype.c:4008
        is_instantiatable = <optimized out>
        check = <optimized out>
#1  0x00007f01fe438923 in dir_enum_async_ready (source=0x7f0238928b80, res=0x7f0238be2c10, user_data=user_data@entry=0x7f0238c31030) at bg-pictures-source.c:456
        priv = <optimized out>
        enumerator = <optimized out>
        err = 0x7f02362793a6 <g_list_prepend+22>
#2  0x00007f0236804a75 in g_task_return_now (task=0x7f0238be2c10) at /build/buildd/glib2.0-2.37.3/./gio/gtask.c:1108
No locals.
#3  0x00007f0236804a99 in complete_in_idle_cb (task=0x7f0238be2c10) at /build/buildd/glib2.0-2.37.3/./gio/gtask.c:1117
No locals.
#4  0x00007f023627d0a6 in g_main_dispatch (context=0x7f023881d0d0) at /build/buildd/glib2.0-2.37.3/./glib/gmain.c:3058
        dispatch = 0x7f023627a0f0 <g_idle_dispatch>
        was_in_call = 0
        user_data = 0x7f0238be2c10
        callback = 0x7f0236804a90 <complete_in_idle_cb>
        cb_funcs = 0x7f0236533940 <g_source_callback_funcs>
        cb_data = 0x7f01f0009110
        need_destroy = <optimized out>
        current_source_link = {data = 0x7f01f0009ad0, next = 0x0}
        source = 0x7f01f0009ad0
        current = 0x7f0238867690
        i = 1
#5  g_main_context_dispatch (context=context@entry=0x7f023881d0d0) at /build/buildd/glib2.0-2.37.3/./glib/gmain.c:3634
No locals.
#6  0x00007f023627d3f8 in g_main_context_iterate (context=context@entry=0x7f023881d0d0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.37.3/./glib/gmain.c:3705
        max_priority = 300
        timeout = 0
        some_ready = 1
        nfds = <optimized out>
        allocated_nfds = 4
        fds = 0x7f02388df330
#7  0x00007f023627d49c in g_main_context_iteration (context=0x7f023881d0d0, context@entry=0x0, may_block=may_block@entry=1) at /build/buildd/glib2.0-2.37.3/./glib/gmain.c:3766
        retval = <optimized out>
#8  0x00007f0236825a1c in g_application_run (application=0x7f0238850e60, argc=argc@entry=2, argv=argv@entry=0x7fff284932c8) at /build/buildd/glib2.0-2.37.3/./gio/gapplication.c:1635
        arguments = 0x7f0238b96760
        status = 0
        i = <optimized out>
        __PRETTY_FUNCTION__ = "g_application_run"
#9  0x00007f023811b25a in main (argc=2, argv=0x7fff284932c8) at control-center.c:263
        shell = <optimized out>
        application = 0x7f0238850e60
        status = <optimized out>