/usr/lib/gdm/gdm-simple-slave --display-id /org/gnome/DisplayManager/Display1

Program received signal SIGABRT, Aborted.
0x00007fd569d70ba5 in raise () from /lib/libc.so.6
(gdb) bt full
#0  0x00007fd569d70ba5 in raise () from /lib/libc.so.6
No symbol table info available.
#1  0x00007fd569d746b0 in abort () from /lib/libc.so.6
No symbol table info available.
#2  0x00007fd56a474804 in g_assertion_message () from /lib/libglib-2.0.so.0
No symbol table info available.
#3  0x00007fd56a474da0 in g_assertion_message_expr () from /lib/libglib-2.0.so.0
No symbol table info available.
#4  0x00000000004119d4 in answer_pending_query (session=0x12748a0, text=0x128d3a0 "") at gdm-session-direct.c:939
        reply = <value optimized out>
        iter = {dummy1 = 0x124c620, dummy2 = 0x12748a0, dummy3 = 19343824, dummy4 = 0, dummy5 = 19345392, dummy6 = 0,
          dummy7 = 19452832, dummy8 = 0, dummy9 = 1880731664, dummy10 = 32767, dummy11 = 0, pad1 = 0, pad2 = 4258755,
          pad3 = 0x0}
#5  gdm_session_direct_answer_query (session=0x12748a0, text=0x128d3a0 "") at gdm-session-direct.c:2327
        __PRETTY_FUNCTION__ = "gdm_session_direct_answer_query"
#6  0x00007fd56ab0ba6e in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#7  0x00007fd56ab214d7 in ?? () from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#8  0x00007fd56ab22996 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#9  0x00007fd56ab22f53 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#10 0x0000000000408be7 in handle_answer_query (connection=0x12766a0, message=<value optimized out>,
    user_data=<value optimized out>) at gdm-greeter-server.c:429
        reply = <value optimized out>
        error = {name = 0x0, message = 0x0, dummy1 = 1, dummy2 = 0, dummy3 = 0, dummy4 = 0, dummy5 = 1,
          padding1 = 0x7fd56beff1bb}
        text = 0x128e1e4 ""
#11 greeter_handle_child_message (connection=0x12766a0, message=<value optimized out>, user_data=<value optimized out>)
    at gdm-greeter-server.c:664
        greeter_server = 0x12534f0
#12 greeter_server_message_handler (connection=0x12766a0, message=<value optimized out>, user_data=<value optimized out>)
    at gdm-greeter-server.c:846
        dbus_destination = <value optimized out>
        dbus_path = <value optimized out>
        dbus_interface = 0x128e548 "org.gnome.DisplayManager.GreeterServer"
        dbus_member = <value optimized out>
#13 0x00007fd56bef4e4e in ?? () from /lib/libdbus-1.so.3
No symbol table info available.
#14 0x00007fd56bee848c in dbus_connection_dispatch () from /lib/libdbus-1.so.3
No symbol table info available.
#15 0x00007fd56c123a45 in ?? () from /usr/lib/libdbus-glib-1.so.2
No symbol table info available.
#16 0x00007fd56a44e342 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
No symbol table info available.
#17 0x00007fd56a4522a8 in ?? () from /lib/libglib-2.0.so.0
No symbol table info available.
#18 0x00007fd56a4527b5 in g_main_loop_run () from /lib/libglib-2.0.so.0
No symbol table info available.
#19 0x0000000000407c35 in main (argc=1, argv=0x7fff7019b7a8) at simple-slave-main.c:264
        main_loop = 0x1251ce0
        context = <value optimized out>
        connection = <value optimized out>
        slave = <value optimized out>
        display_id = 0x1245b00 "/org/gnome/DisplayManager/Display1"
        username = 0x0
        signal_handler = 0x123c5e0
        entries = {{long_name = 0x421681 "display-id", short_name = 0 '\000', flags = 0, arg = G_OPTION_ARG_STRING,
            arg_data = 0x630c38, description = 0x42168c "Display ID", arg_description = 0x421694 "ID"}, {
            long_name = 0x421697 "username", short_name = 0 '\000', flags = 0, arg = G_OPTION_ARG_STRING,
            arg_data = 0x630c30, description = 0x4216a0 "Username", arg_description = 0x4228d2 "name"}, {long_name = 0x0,
            short_name = 0 '\000', flags = 0, arg = G_OPTION_ARG_NONE, arg_data = 0x0, description = 0x0,
            arg_description = 0x0}}

