.
Thread 3 (Thread 0x7fb7739c8700 (LWP 6513)):
#0  __lll_unlock_wake () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:373
No locals.
#1  0x00007fb798f52284 in _L_unlock_664 () from /tmp/tmpfe46Kf/lib/x86_64-linux-gnu/libpthread.so.0
No symbol table info available.
#2  0x00007fb798f521e3 in __pthread_mutex_unlock_usercnt (mutex=<optimized out>, decr=<optimized out>) at pthread_mutex_unlock.c:52
        type = 1
#3  __pthread_mutex_unlock (mutex=0x7fb79c541290) at pthread_mutex_unlock.c:290
No locals.
#4  0x00007fb79996686e in on_worker_message_received (worker=<optimized out>, message=0x7fb79c5a4190, user_data=<optimized out>) at /build/buildd/glib2.0-2.29.92/./gio/gdbusconnection.c:2147
        message_type = <optimized out>
        connection = 0x7fb79c3f4cb0
        filters = 0x0
        num_filters = <optimized out>
        n = <optimized out>
        alive = <optimized out>
#5  0x00007fb79997ae85 in _g_dbus_worker_emit_message_received (message=0x7fb79c5a4190, worker=0x7fb79c536000) at /build/buildd/glib2.0-2.29.92/./gio/gdbusprivate.c:485
No locals.
#6  _g_dbus_worker_emit_message_received (message=0x7fb79c5a4190, worker=0x7fb79c536000) at /build/buildd/glib2.0-2.29.92/./gio/gdbusprivate.c:2073
No locals.
#7  _g_dbus_worker_queue_or_deliver_received_message (message=0x7fb79c5a4190, worker=0x7fb79c536000) at /build/buildd/glib2.0-2.29.92/./gio/gdbusprivate.c:513
No locals.
#8  _g_dbus_worker_do_read_cb (input_stream=<optimized out>, res=<optimized out>, user_data=0x7fb79c536000) at /build/buildd/glib2.0-2.29.92/./gio/gdbusprivate.c:764
        message = 0x7fb79c5a4190
        worker = 0x7fb79c536000
        error = 0x0
        bytes_read = 179
#9  0x00007fb79991cee1 in g_simple_async_result_complete (simple=0x7fb79c59eb00) at /build/buildd/glib2.0-2.29.92/./gio/gsimpleasyncresult.c:749
        current_source = <optimized out>
        current_context = <optimized out>
        __PRETTY_FUNCTION__ = "g_simple_async_result_complete"
#10 0x00007fb79991d01c in complete_in_idle_cb (data=0x7fb79c59eb00) at /build/buildd/glib2.0-2.29.92/./gio/gsimpleasyncresult.c:761
        simple = <optimized out>
#11 0x00007fb7991a8b4d in g_main_dispatch (context=0x7fb79c0f1f00) at /build/buildd/glib2.0-2.29.92/./glib/gmain.c:2441
        dispatch = 0x7fb7991a4880 <g_idle_dispatch>
        was_in_call = 0
        user_data = 0x7fb79c59eb00
        callback = 0x7fb79991d000 <complete_in_idle_cb>
        cb_funcs = 0x7fb799458670
        cb_data = 0x7fb76c0095d0
        current_source_link = {data = 0x7fb76c00a850, next = 0x0}
        need_destroy = <optimized out>
        source = 0x7fb76c00a850
        current = 0x7fb79c16e2c0
        i = <optimized out>
#12 g_main_context_dispatch (context=0x7fb79c0f1f00) at /build/buildd/glib2.0-2.29.92/./glib/gmain.c:3011
No locals.
#13 0x00007fb7991a9348 in g_main_context_iterate (context=0x7fb79c0f1f00, block=<optimized out>, dispatch=1, self=<optimized out>) at /build/buildd/glib2.0-2.29.92/./glib/gmain.c:3089
        max_priority = 0
        timeout = 0
        some_ready = 1
        nfds = 3
        allocated_nfds = <optimized out>
        fds = <optimized out>
#14 0x00007fb7991a9882 in g_main_loop_run (loop=0x7fb79c0f1e20) at /build/buildd/glib2.0-2.29.92/./glib/gmain.c:3297
        __PRETTY_FUNCTION__ = "g_main_loop_run"
#15 0x00007fb7999789a6 in gdbus_shared_thread_func (user_data=0x7fb79c0f1ed0) at /build/buildd/glib2.0-2.29.92/./gio/gdbusprivate.c:276
        data = 0x7fb79c0f1ed0
#16 0x00007fb7991ce616 in g_thread_create_proxy (data=0x7fb79c0f1ff0) at /build/buildd/glib2.0-2.29.92/./glib/gthread.c:1962
        thread = 0x7fb79c0f1ff0
        __PRETTY_FUNCTION__ = "g_thread_create_proxy"
#17 0x00007fb798f4eedc in start_thread (arg=0x7fb7739c8700) at pthread_create.c:304
        __res = <optimized out>
        pd = 0x7fb7739c8700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, -5990373448170315105, 140733831261040, 140425895381440, 0, 3, 6031177720581350047, 6031123642046505631}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
        robust = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#18 0x00007fb798c8989d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
No locals.
#19 0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 2 (Thread 0x7fb772c99700 (LWP 6515)):
#0  0x00007fb798c7d773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
        resultvar = <optimized out>
        oldtype = 0
        result = <optimized out>
#1  0x00007fb7991a9058 in g_main_context_poll (n_fds=1, fds=0x7fb79c4c6360, timeout=-1, context=0x7fb79c4dc900, priority=<optimized out>) at /build/buildd/glib2.0-2.29.92/./glib/gmain.c:3402
        poll_func = 0x7fb7991b7610 <g_poll>
#2  g_main_context_iterate (context=0x7fb79c4dc900, block=<optimized out>, dispatch=1, self=<optimized out>) at /build/buildd/glib2.0-2.29.92/./glib/gmain.c:3084
        max_priority = 2147483647
        timeout = -1
        some_ready = <optimized out>
        nfds = 1
        allocated_nfds = <optimized out>
        fds = 0x7fb79c4c6360
#3  0x00007fb7991a9882 in g_main_loop_run (loop=0x7fb79c4dc840) at /build/buildd/glib2.0-2.29.92/./glib/gmain.c:3297
        __PRETTY_FUNCTION__ = "g_main_loop_run"
#4  0x00007fb772c9e9cb in dconf_context_thread (data=<optimized out>) at dconfcontext.c:11
        context = 0x7fb79c4dc900
        loop = <optimized out>
        __PRETTY_FUNCTION__ = "dconf_context_thread"
#5  0x00007fb7991ce616 in g_thread_create_proxy (data=0x7fb79c4dc9f0) at /build/buildd/glib2.0-2.29.92/./glib/gthread.c:1962
        thread = 0x7fb79c4dc9f0
        __PRETTY_FUNCTION__ = "g_thread_create_proxy"
#6  0x00007fb798f4eedc in start_thread (arg=0x7fb772c99700) at pthread_create.c:304
        __res = <optimized out>
        pd = 0x7fb772c99700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, -5990373448170315105, 140733831260176, 140425881557440, 0, 3, 6031180291656147615, 6031123642046505631}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
        robust = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#7  0x00007fb798c8989d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
No locals.
#8  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 1 (Thread 0x7fb79b453940 (LWP 6511)):
#0  gcm_prefs_add_device (prefs=0x7fb79c540020, device=0x7fb79c5dbce0) at cc-color-panel.c:1689
        ret = <optimized out>
        error = 0x0
        kind = <optimized out>
        icon_name = 0x7fb799670360 "H\211\\$\330H\211l$\340H\211\373L\211l$\360L\211d$\350I\211\315L\211t$\370H\203\354(\203\372\002L\211\315t=H\215\025\364\302\002"
        id = <optimized out>
        sort = 0x0
        title = 0x0
        parent = {stamp = -1672393728, user_data = 0x7fb799694325, user_data2 = 0x7fb79c5addf0, user_data3 = 0x7fb798f521b0}
        priv = 0xaaaaaaaaaaaaaaaa
#1  0x00007fb7775e033c in gcm_prefs_device_added_cb (client=<optimized out>, device=<optimized out>, prefs=0x7fb79c540020) at cc-color-panel.c:1810
No locals.
#2  0x00007fb79966e254 in g_closure_invoke (closure=0x7fb79c599340, return_value=0x0, n_param_values=2, param_values=0x7fb79c4dda70, invocation_hint=<optimized out>) at /build/buildd/glib2.0-2.29.92/./gobject/gclosure.c:774
        marshal = 0x7fb799670360 <g_cclosure_marshal_VOID__OBJECT>
        marshal_data = <optimized out>
        in_marshal = <optimized out>
        __PRETTY_FUNCTION__ = "g_closure_invoke"
#3  0x00007fb7996814fb in signal_emit_unlocked_R (node=<optimized out>, detail=0, instance=0x7fb79c0bda10, emission_return=0x0, instance_and_params=0x7fb79c4dda70) at /build/buildd/glib2.0-2.29.92/./gobject/gsignal.c:3272
        tmp = <optimized out>
        handler = 0x7fb79c57f430
        accumulator = 0x0
        emission = {next = 0x7fff26052a10, instance = 0x7fb79c0bda10, ihint = {signal_id = 293, detail = 0, run_type = G_SIGNAL_RUN_FIRST}, state = EMISSION_RUN, chain_type = 4}
        class_closure = 0x7fb79c52f8b0
        hlist = 0x7fb798f521b0
        handler_list = 0x7fb79c57f430
        return_accu = 0x0
        accu = {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}}}
        signal_id = 293
        max_sequential_handler_number = 1705
        return_value_altered = 0
#4  0x00007fb79968ab17 in g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>, var_args=0x7fff26052598) at /build/buildd/glib2.0-2.29.92/./gobject/gsignal.c:3003
        instance_and_params = 0x7fb79c4dda70
        signal_return_type = 4
        param_values = 0x7fb79c4dda88
        node = 0x7fb79c52f960
        i = <optimized out>
        n_params = 1
        __PRETTY_FUNCTION__ = "g_signal_emit_valist"
#5  0x00007fb79968ace2 in g_signal_emit (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>) at /build/buildd/glib2.0-2.29.92/./gobject/gsignal.c:3060
        var_args = {{gp_offset = 32, fp_offset = 48, overflow_arg_area = 0x7fff26052670, reg_save_area = 0x7fff260525b0}}
#6  0x00007fb7773c26e9 in cd_client_dbus_signal_cb (proxy=<optimized out>, sender_name=<optimized out>, signal_name=<optimized out>, parameters=0x7fb79c53d6a0, client=0x7fb79c0bda10) at cd-client.c:209
        device = 0x7fb79c5dbce0
        profile = 0x0
        sensor = 0x0
        object_path_tmp = 0x7fb79c599240 "/org/freedesktop/ColorManager/devices/cups_PDF"
#7  0x00007fb795150a14 in ffi_call_unix64 () at ../src/x86/unix64.S:75
No locals.
#8  0x00007fb795150435 in ffi_call (cif=0x7fff26052870, fn=0x7fb7773c2610 <cd_client_dbus_signal_cb>, rvalue=<optimized out>, avalue=<optimized out>) at ../src/x86/ffi64.c:486
        classes = {X86_64_INTEGER_CLASS, X86_64_NO_CLASS, X86_64_NO_CLASS, X86_64_NO_CLASS}
        stack = 0x7fff260525f0 "\220C?\234\267\177"
        argp = 0x7fff260526a0 ""
        arg_types = <optimized out>
        gprcount = 5
        ssecount = <optimized out>
        ngpr = 1
        nsse = 0
        i = <optimized out>
        avn = <optimized out>
        ret_in_memory = <optimized out>
        reg_args = 0x7fff260525f0
#9  0x00007fb79966e717 in g_cclosure_marshal_generic (closure=0x7fb79c490af0, return_gvalue=0x0, n_param_values=4, param_values=<optimized out>, invocation_hint=<optimized out>, marshal_data=0x7fb7773c2610) at /build/buildd/glib2.0-2.29.92/./gobject/gclosure.c:1147
        rtype = 0x7fb795150e40
        rvalue = 0x7fff26052810
        n_args = 5
        atypes = 0x7fff260527d0
        args = 0x7fff26052790
        i = <optimized out>
        cif = {abi = FFI_UNIX64, nargs = 5, arg_types = 0x7fff260527d0, rtype = 0x7fb795150e40, bytes = 0, flags = 0}
        cc = 0x7fb79c490af0
#10 0x00007fb79966e254 in g_closure_invoke (closure=0x7fb79c490af0, return_value=0x0, n_param_values=4, param_values=0x7fb79c402c00, invocation_hint=<optimized out>) at /build/buildd/glib2.0-2.29.92/./gobject/gclosure.c:774
        marshal = 0x7fb79966e580 <g_cclosure_marshal_generic>
        marshal_data = <optimized out>
        in_marshal = <optimized out>
        __PRETTY_FUNCTION__ = "g_closure_invoke"
#11 0x00007fb7996814fb in signal_emit_unlocked_R (node=<optimized out>, detail=0, instance=0x7fb79c3f4390, emission_return=0x0, instance_and_params=0x7fb79c402c00) at /build/buildd/glib2.0-2.29.92/./gobject/gsignal.c:3272
        tmp = <optimized out>
        handler = 0x7fb79c5d8af0
        accumulator = 0x0
        emission = {next = 0x0, instance = 0x7fb79c3f4390, ihint = {signal_id = 283, detail = 0, run_type = G_SIGNAL_RUN_FIRST}, state = EMISSION_RUN, chain_type = 4}
        class_closure = 0x7fb79c502790
        hlist = 0x7fb798f521b0
        handler_list = 0x7fb79c5d8af0
        return_accu = 0x0
        accu = {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}}}
        signal_id = 283
        max_sequential_handler_number = 1705
        return_value_altered = 0
#12 0x00007fb79968ab17 in g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>, var_args=0x7fff26052c08) at /build/buildd/glib2.0-2.29.92/./gobject/gsignal.c:3003
        instance_and_params = 0x7fb79c402c00
        signal_return_type = 4
        param_values = 0x7fb79c402c18
        node = 0x7fb79c511130
        i = <optimized out>
        n_params = 3
        __PRETTY_FUNCTION__ = "g_signal_emit_valist"
#13 0x00007fb79968ace2 in g_signal_emit (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>) at /build/buildd/glib2.0-2.29.92/./gobject/gsignal.c:3060
        var_args = {{gp_offset = 48, fp_offset = 48, overflow_arg_area = 0x7fff26052ce0, reg_save_area = 0x7fff26052c20}}
#14 0x00007fb79997426e in on_signal_received (connection=<optimized out>, sender_name=0x7fb76c0028e0 ":1.8", object_path=<optimized out>, interface_name=<optimized out>, signal_name=0x7fb76c002840 "DeviceAdded", parameters=0x7fb79c53d6a0, user_data=0x7fb79c523540) at /build/buildd/glib2.0-2.29.92/./gio/gdbusproxy.c:888
        data = 0x7fb79c523540
        proxy = 0x7fb79c3f4390
#15 0x00007fb79996330e in emit_signal_instance_in_idle_cb (data=0x7fb76c004800) at /build/buildd/glib2.0-2.29.92/./gio/gdbusconnection.c:3424
        signal_instance = 0x7fb76c004800
        parameters = 0x7fb79c53d6a0
        has_subscription = 1
#16 0x00007fb7991a8b4d in g_main_dispatch (context=0x7fb79be40550) at /build/buildd/glib2.0-2.29.92/./glib/gmain.c:2441
        dispatch = 0x7fb7991a4880 <g_idle_dispatch>
        was_in_call = 0
        user_data = 0x7fb76c004800
        callback = 0x7fb799963290 <emit_signal_instance_in_idle_cb>
        cb_funcs = 0x7fb799458670
        cb_data = 0x7fb76c0014a0
        current_source_link = {data = 0x7fb76c0013a0, next = 0x0}
        need_destroy = <optimized out>
        source = 0x7fb76c0013a0
        current = 0x7fb79c16ae20
        i = <optimized out>
#17 g_main_context_dispatch (context=0x7fb79be40550) at /build/buildd/glib2.0-2.29.92/./glib/gmain.c:3011
No locals.
#18 0x00007fb7991a9348 in g_main_context_iterate (context=0x7fb79be40550, block=<optimized out>, dispatch=1, self=<optimized out>) at /build/buildd/glib2.0-2.29.92/./glib/gmain.c:3089
        max_priority = 2147483647
        timeout = 2747
        some_ready = 1
        nfds = 4
        allocated_nfds = <optimized out>
        fds = <optimized out>
#19 0x00007fb7991a9882 in g_main_loop_run (loop=0x7fb79c216630) at /build/buildd/glib2.0-2.29.92/./glib/gmain.c:3297
        __PRETTY_FUNCTION__ = "g_main_loop_run"
#20 0x00007fb79ab3878d in gtk_main () at /build/buildd/gtk+3.0-3.1.92/./gtk/gtkmain.c:1367
        loop = 0x7fb79c216630
#21 0x00007fb79994e34e in g_application_run (application=0x7fb79bfc0620, argc=<optimized out>, argv=<optimized out>) at /build/buildd/glib2.0-2.29.92/./gio/gapplication.c:1323
        arguments = 0x7fb79c216630
        status = 0
        i = <optimized out>
        __PRETTY_FUNCTION__ = "g_application_run"
#22 0x00007fb79b4923bc in main (argc=1, argv=0x7fff26052ff8) at control-center.c:201
        shell = <optimized out>
        application = 0x7fb79bfc0620
        status = <optimized out>