Here is the notify-osd trace:

--- stack trace ---
#0  0x0000000000411ae6 in bubble_get_id ()
No symbol table info available.
#1  0x000000000041d77c in stack_notify_handler ()
No symbol table info available.
#2  0x000000000041c005 in dbus_glib_marshal_stack_VOID__STRING_UINT_STRING_STRING_STRING_BOXED_BOXED_INT_POINTER ()
No symbol table info available.
#3  0x00007f1e15e797dd in invoke_object_method (message=0xa1b260, connection=0x8a07b0, method=0x4299c0, object_info=0x429720 <dbus_glib_stack_object_info>, object=0x890800) at dbus-gobject.c:1899
        had_error = <optimized out>
        value_array = 0x8b0140
        gerror = 0x0
        closure = {ref_count = 0, meta_marshal_nouse = 0, n_guards = 0, n_fnotifiers = 0, n_inotifiers = 0, in_inotify = 0, floating = 0, derivative_flag = 0, in_marshal = 0, is_invalid = 0, marshal = 0x0, data = 0x0, notifiers = 0x0}
        out_param_pos = <optimized out>
        have_retval = 0
        send_reply = 1
        in_signature = 0x7d1ed0 "susssasa{sv}i"
        out_param_count = <optimized out>
        out_param_gvalue_pos = <optimized out>
        retval_signals_error = 0
        arg_metadata = <optimized out>
        is_async = <optimized out>
        out_param_values = 0x0
        return_value = {g_type = 0, data = {{v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
        out_param_gvalues = 0x0
        reply = 0x0
        retval_is_synthetic = 0
        retval_is_constant = 0
#4  object_registration_message (connection=0x8a07b0, message=0xa1b260, user_data=<optimized out>) at dbus-gobject.c:2161
        pspec = <optimized out>
        object = 0x890800
        setter = <optimized out>
        getter = <optimized out>
        getall = <optimized out>
        s = <optimized out>
        requested_propname = <optimized out>
        wincaps_propiface = <optimized out>
        iter = {dummy1 = 0x0, dummy2 = 0x0, dummy3 = 0, dummy4 = 0, dummy5 = 1, dummy6 = 0, dummy7 = 9047840, dummy8 = 0, dummy9 = 9065808, dummy10 = 0, dummy11 = 9065888, pad1 = 0, pad2 = 0, pad3 = 0x0}
        method = 0x4299c0
        object_info = 0x429720 <dbus_glib_stack_object_info>
        ret = <optimized out>
        o = <optimized out>
#5  0x00007f1e15c43126 in ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
No symbol table info available.
#6  0x00007f1e15c35cd1 in dbus_connection_dispatch () from /lib/x86_64-linux-gnu/libdbus-1.so.3
No symbol table info available.
#7  0x00007f1e15e76c95 in message_queue_dispatch (source=source@entry=0x8a34b0, callback=<optimized out>, user_data=<optimized out>) at dbus-gmain.c:90
        connection = 0x8a07b0
#8  0x00007f1e13c8d226 in g_main_dispatch (context=0x7be1e0) at /build/buildd/glib2.0-2.37.0/./glib/gmain.c:3058
        dispatch = 0x7f1e15e76c80 <message_queue_dispatch>
        was_in_call = 0
        user_data = 0x0
        callback = 0x0
        cb_funcs = 0x0
        cb_data = 0x0
        need_destroy = <optimized out>
        current_source_link = {data = 0x8a34b0, next = 0x0}
        source = 0x8a34b0
        current = 0x7f75a0
        i = 0
#9  g_main_context_dispatch (context=context@entry=0x7be1e0) at /build/buildd/glib2.0-2.37.0/./glib/gmain.c:3634
No locals.
#10 0x00007f1e13c8d578 in g_main_context_iterate (context=0x7be1e0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.37.0/./glib/gmain.c:3705
        max_priority = 0
        timeout = 0
        some_ready = 1
        nfds = <optimized out>
        allocated_nfds = 4
        fds = 0x8a5350
#11 0x00007f1e13c8d97a in g_main_loop_run (loop=0x89fdd0) at /build/buildd/glib2.0-2.37.0/./glib/gmain.c:3899
        __PRETTY_FUNCTION__ = "g_main_loop_run"
#12 0x00007f1e154bb4a5 in gtk_main () at /build/buildd/gtk+3.0-3.6.4/./gtk/gtkmain.c:1160
        loop = 0x89fdd0
#13 0x000000000040e21d in main ()
No symbol table info available.
--- source code stack trace ---
#0  0x0000000000411ae6 in bubble_get_id ()
#1  0x000000000041d77c in stack_notify_handler ()
#2  0x000000000041c005 in dbus_glib_marshal_stack_VOID__STRING_UINT_STRING_STRING_STRING_BOXED_BOXED_INT_POINTER ()
#3  0x00007f1e15e797dd in invoke_object_method (message=0xa1b260, connection=0x8a07b0, method=0x4299c0, object_info=0x429720 <dbus_glib_stack_object_info>, object=0x890800) at dbus-gobject.c:1899
  [Error: dbus-gobject.c was not found in source tree]
#4  object_registration_message (connection=0x8a07b0, message=0xa1b260, user_data=<optimized out>) at dbus-gobject.c:2161
  [Error: dbus-gobject.c was not found in source tree]
#5  0x00007f1e15c43126 in ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
#6  0x00007f1e15c35cd1 in dbus_connection_dispatch () from /lib/x86_64-linux-gnu/libdbus-1.so.3
#7  0x00007f1e15e76c95 in message_queue_dispatch (source=source@entry=0x8a34b0, callback=<optimized out>, user_data=<optimized out>) at dbus-gmain.c:90
  [Error: dbus-gmain.c was not found in source tree]
#8  0x00007f1e13c8d226 in g_main_dispatch (context=0x7be1e0) at /build/buildd/glib2.0-2.37.0/./glib/gmain.c:3058
  [Error: /build/buildd/glib2.0-2.37.0/./glib/gmain.c was not found in source tree]
#9  g_main_context_dispatch (context=context@entry=0x7be1e0) at /build/buildd/glib2.0-2.37.0/./glib/gmain.c:3634
  [Error: /build/buildd/glib2.0-2.37.0/./glib/gmain.c was not found in source tree]
#10 0x00007f1e13c8d578 in g_main_context_iterate (context=0x7be1e0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.37.0/./glib/gmain.c:3705
  [Error: /build/buildd/glib2.0-2.37.0/./glib/gmain.c was not found in source tree]
#11 0x00007f1e13c8d97a in g_main_loop_run (loop=0x89fdd0) at /build/buildd/glib2.0-2.37.0/./glib/gmain.c:3899
  [Error: /build/buildd/glib2.0-2.37.0/./glib/gmain.c was not found in source tree]
#12 0x00007f1e154bb4a5 in gtk_main () at /build/buildd/gtk+3.0-3.6.4/./gtk/gtkmain.c:1160
  [Error: /build/buildd/gtk+3.0-3.6.4/./gtk/gtkmain.c was not found in source tree]
#13 0x000000000040e21d in main ()