.
Thread 3 (Thread 0x7f717ccd4700 (LWP 24504)):
#0  0x00007f7183e60b03 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  0x00007f71846d00e6 in g_main_context_poll (n_fds=5, fds=0x7f7170006ba0, timeout=-1, context=0x7f717800d7c0, priority=<optimized out>) at /build/buildd/glib2.0-2.31.22/./glib/gmain.c:3417
        poll_func = 0x7f71846dd060 <g_poll>
#2  g_main_context_iterate (dispatch=1, block=<optimized out>, context=0x7f717800d7c0, self=<optimized out>) at /build/buildd/glib2.0-2.31.22/./glib/gmain.c:3118
        timeout = -1
        some_ready = <optimized out>
        fds = 0x7f7170006ba0
        max_priority = 2147483647
        nfds = 5
        allocated_nfds = <optimized out>
#3  g_main_context_iterate (context=0x7f717800d7c0, block=<optimized out>, dispatch=1, self=<optimized out>) at /build/buildd/glib2.0-2.31.22/./glib/gmain.c:3060
        some_ready = 1879075744
#4  0x00007f71846d054a in g_main_loop_run (loop=0x7f717800d770) at /build/buildd/glib2.0-2.31.22/./glib/gmain.c:3317
        __PRETTY_FUNCTION__ = "g_main_loop_run"
#5  0x00007f7184ca1656 in gdbus_shared_thread_func (user_data=<optimized out>) at /build/buildd/glib2.0-2.31.22/./gio/gdbusprivate.c:277
        data = 0x7f717800d790
#6  0x00007f71846f1cd5 in g_thread_proxy (data=0x7f717800ac00) at /build/buildd/glib2.0-2.31.22/./glib/gthread.c:801
        thread = 0x7f717800ac00
#7  0x00007f718413ee9a in start_thread (arg=0x7f717ccd4700) at pthread_create.c:308
        __res = <optimized out>
        pd = 0x7f717ccd4700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, -2984856487647906192, 140125410249008, 140125401860544, 0, 3, 2914199823921575536, 2914005916275308144}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#8  0x00007f7183e6c4bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
No locals.
#9  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 2 (Thread 0x7f717d4d5700 (LWP 24503)):
#0  0x00007f7183e60b03 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  0x00007f71846d00e6 in g_main_context_poll (n_fds=1, fds=0x7f71780010e0, timeout=-1, context=0x7f71873969c0, priority=<optimized out>) at /build/buildd/glib2.0-2.31.22/./glib/gmain.c:3417
        poll_func = 0x7f71846dd060 <g_poll>
#2  g_main_context_iterate (dispatch=1, block=<optimized out>, context=0x7f71873969c0, self=<optimized out>) at /build/buildd/glib2.0-2.31.22/./glib/gmain.c:3118
        timeout = -1
        some_ready = <optimized out>
        fds = 0x7f71780010e0
        max_priority = 2147483647
        nfds = 1
        allocated_nfds = <optimized out>
#3  g_main_context_iterate (context=0x7f71873969c0, block=<optimized out>, dispatch=1, self=<optimized out>) at /build/buildd/glib2.0-2.31.22/./glib/gmain.c:3060
        some_ready = 2013270240
#4  0x00007f71846d054a in g_main_loop_run (loop=0x7f71780010c0) at /build/buildd/glib2.0-2.31.22/./glib/gmain.c:3317
        __PRETTY_FUNCTION__ = "g_main_loop_run"
#5  0x00007f717e67398b in dconf_context_thread (data=<optimized out>) at dconfcontext.c:11
        context = 0x7f71873969c0
        loop = <optimized out>
        __PRETTY_FUNCTION__ = "dconf_context_thread"
#6  0x00007f71846f1cd5 in g_thread_proxy (data=0x7f7187380f20) at /build/buildd/glib2.0-2.31.22/./glib/gthread.c:801
        thread = 0x7f7187380f20
#7  0x00007f718413ee9a in start_thread (arg=0x7f717d4d5700) at pthread_create.c:308
        __res = <optimized out>
        pd = 0x7f717d4d5700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, -2984856487647906192, 140734398483056, 140125410253248, 0, 3, 2914200921822590576, 2914005916275308144}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#8  0x00007f7183e6c4bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
No locals.
#9  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 1 (Thread 0x7f71867c3940 (LWP 24502)):
#0  gcm_prefs_add_device (prefs=0x7f7187453750, device=0x7f7187e2d9f0) at cc-color-panel.c:1915
        ret = <optimized out>
        error = 0x0
        kind = <optimized out>
        icon_name = 0x7fff47d442e0 "\340\301\252\207q\177"
        id = <optimized out>
        sort = 0x0
        title = 0x0
        parent = {stamp = -2018852384, user_data = 0x7f7187e2d9f0, user_data2 = 0x1, user_data3 = 0x7f71849a7472}
        priv = 0xaaaaaaaaaaaaaaaa
#1  0x00007f715cf379fc in gcm_prefs_device_added_cb (client=<optimized out>, device=<optimized out>, prefs=0x7f7187453750) at cc-color-panel.c:2044
No locals.
#2  0x00007f7184990624 in g_cclosure_marshal_VOID__OBJECTv (closure=0x7f7187a5f7c0, return_value=<optimized out>, instance=0x7f7187cfe240, args=<optimized out>, marshal_data=<optimized out>, n_params=<optimized out>, param_types=0x7f71877aa420) at /build/buildd/glib2.0-2.31.22/./gobject/gmarshal.c:1312
        cc = 0x7f7187a5f7c0
        data1 = <optimized out>
        data2 = <optimized out>
        callback = 0x7f715cf379f0 <gcm_prefs_device_added_cb>
        arg0 = 0x7f7187e2d9f0
        args_copy = {{gp_offset = 32, fp_offset = 48, overflow_arg_area = 0x7fff47d44610, reg_save_area = 0x7fff47d44550}}
#3  0x00007f718498d09a in _g_closure_invoke_va (closure=0x7f7187a5f7c0, return_value=0x0, instance=0x7f7187cfe240, args=0x7fff47d44538, n_params=1, param_types=<optimized out>) at /build/buildd/glib2.0-2.31.22/./gobject/gclosure.c:840
        marshal = 0x7f71849905a0 <g_cclosure_marshal_VOID__OBJECTv>
        marshal_data = <optimized out>
        in_marshal = 0
        real_closure = 0x7f7187a5f7a0
        __PRETTY_FUNCTION__ = "_g_closure_invoke_va"
#4  0x00007f71849a6d17 in g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=0, var_args=<optimized out>) at /build/buildd/glib2.0-2.31.22/./gobject/gsignal.c:3207
        return_accu = <optimized out>
        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}}}
        accumulator = 0x0
        emission = {next = 0x7fff47d449d0, instance = 0x7f7187cfe240, ihint = {signal_id = 344, detail = 0, run_type = G_SIGNAL_RUN_FIRST}, state = EMISSION_RUN, chain_type = 140125581441888}
        signal_id = <optimized out>
        instance_type = <optimized out>
        emission_return = {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}}}
        rtype = 4
        static_scope = 0
        closure = 0x7f7187a5f7c0
        run_type = <optimized out>
        hlist = 0x50
        l = <optimized out>
        fastpath = 1
        instance_and_params = <optimized out>
        signal_return_type = <optimized out>
        param_values = <optimized out>
        node = 0x7f71877aa440
        i = <optimized out>
        n_params = <optimized out>
        __PRETTY_FUNCTION__ = "g_signal_emit_valist"
#5  0x00007f71849a7472 in g_signal_emit (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>) at /build/buildd/glib2.0-2.31.22/./gobject/gsignal.c:3352
        var_args = {{gp_offset = 24, fp_offset = 48, overflow_arg_area = 0x7fff47d44610, reg_save_area = 0x7fff47d44550}}
#6  0x00007f715cd16359 in ?? () from /tmp/tmpxmPdEf/usr/lib/x86_64-linux-gnu/libcolord.so.1
No symbol table info available.
#7  0x00007f71805cda14 in ffi_call_unix64 () at ../src/x86/unix64.S:75
No locals.
#8  0x00007f71805cd435 in ffi_call (cif=0x7fff47d44830, fn=0x7f715cd16280, rvalue=<optimized out>, avalue=<optimized out>) at ../src/x86/ffi64.c:486
        classes = {X86_64_INTEGER_CLASS, X86_64_NO_CLASS, 24, X86_64_NO_CLASS}
        stack = 0x7fff47d44590 ""
        argp = 0x7fff47d44640 ""
        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 = 0x7fff47d44590
#9  0x00007f718498d6db in g_cclosure_marshal_generic (closure=0x7f7187a750c0, return_gvalue=0x0, n_param_values=4, param_values=<optimized out>, invocation_hint=<optimized out>, marshal_data=0x7f715cd16280) at /build/buildd/glib2.0-2.31.22/./gobject/gclosure.c:1451
        rtype = 0x7f71805cde40
        rvalue = 0x7fff47d447b0
        n_args = 5
        atypes = 0x7fff47d44770
        args = 0x7fff47d44730
        i = <optimized out>
        cif = {abi = FFI_UNIX64, nargs = 5, arg_types = 0x7fff47d44770, rtype = 0x7f71805cde40, bytes = 0, flags = 0}
        cc = 0x7f7187a750c0
        enum_tmpval = 0x7fff47d447d0
        tmpval_used = 0
#10 0x00007f718498ce72 in g_closure_invoke (closure=0x7f7187a750c0, return_value=0x0, n_param_values=4, param_values=0x7fff47d44a90, invocation_hint=<optimized out>) at /build/buildd/glib2.0-2.31.22/./gobject/gclosure.c:777
        marshal = 0x7f718498d4e0 <g_cclosure_marshal_generic>
        marshal_data = <optimized out>
        in_marshal = <optimized out>
        real_closure = 0x7f7187a750a0
        __PRETTY_FUNCTION__ = "g_closure_invoke"
#11 0x00007f718499e943 in signal_emit_unlocked_R (node=<optimized out>, detail=0, instance=<optimized out>, emission_return=0x0, instance_and_params=0x7fff47d44a90) at /build/buildd/glib2.0-2.31.22/./gobject/gsignal.c:3547
        tmp = <optimized out>
        handler = 0x7f7187c9b2f0
        accumulator = 0x0
        emission = {next = 0x0, instance = 0x7f7187c7f400, ihint = {signal_id = 258, detail = 0, run_type = G_SIGNAL_RUN_FIRST}, state = EMISSION_RUN, chain_type = 4}
        class_closure = 0x7f718764ad50
        hlist = 0x7f7187cdf788
        handler_list = 0x7f7187c9b2f0
        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 = 258
        max_sequential_handler_number = 10255
        return_value_altered = 0
#12 0x00007f71849a7230 in g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=0, var_args=<optimized out>) at /build/buildd/glib2.0-2.31.22/./gobject/gsignal.c:3296
        instance_and_params = 0x7fff47d44a90
        signal_return_type = 4
        param_values = 0x7fff47d44aa8
        node = 0x7f71875f0e60
        i = <optimized out>
        n_params = 3
        __PRETTY_FUNCTION__ = "g_signal_emit_valist"
#13 0x00007f71849a7472 in g_signal_emit (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>) at /build/buildd/glib2.0-2.31.22/./gobject/gsignal.c:3352
        var_args = {{gp_offset = 48, fp_offset = 48, overflow_arg_area = 0x7fff47d44de0, reg_save_area = 0x7fff47d44d20}}
#14 0x00007f7184c9d934 in on_signal_received (connection=<optimized out>, sender_name=0x7f7170008f30 ":1.31", object_path=<optimized out>, interface_name=<optimized out>, signal_name=0x7f7170005ac0 "DeviceAdded", parameters=0x7f7170012410, user_data=0x7f7187c92460) at /build/buildd/glib2.0-2.31.22/./gio/gdbusproxy.c:927
        data = 0x7f7187c92460
        proxy = 0x7f7187c7f400
#15 0x00007f7184c8d005 in emit_signal_instance_in_idle_cb (data=0x7f7170014970) at /build/buildd/glib2.0-2.31.22/./gio/gdbusconnection.c:3665
        signal_instance = 0x7f7170014970
        parameters = 0x7f7170012410
        has_subscription = 1
#16 0x00007f71846cfd8a in g_main_dispatch (context=0x7f7187384880) at /build/buildd/glib2.0-2.31.22/./glib/gmain.c:2515
        dispatch = 0x7f71846cd9e0 <g_idle_dispatch>
        was_in_call = 0
        user_data = 0x7f7170014970
        callback = 0x7f7184c8cf90 <emit_signal_instance_in_idle_cb>
        cb_funcs = 0x7f718497b9a0
        cb_data = 0x7f7170005b00
        current_source_link = {data = 0x7f7170009090, next = 0x0}
        need_destroy = <optimized out>
        source = 0x7f7170009090
        current = 0x7f71875f87a0
        i = <optimized out>
#17 g_main_context_dispatch (context=0x7f7187384880) at /build/buildd/glib2.0-2.31.22/./glib/gmain.c:3052
No locals.
#18 0x00007f71846d0150 in g_main_context_iterate (dispatch=1, block=<optimized out>, context=0x7f7187384880, self=<optimized out>) at /build/buildd/glib2.0-2.31.22/./glib/gmain.c:3123
        timeout = 3748
        some_ready = 1
        fds = <optimized out>
        max_priority = 2147483647
        nfds = 6
        allocated_nfds = <optimized out>
#19 g_main_context_iterate (context=0x7f7187384880, block=<optimized out>, dispatch=1, self=<optimized out>) at /build/buildd/glib2.0-2.31.22/./glib/gmain.c:3060
        some_ready = 1
#20 0x00007f71846d0214 in g_main_context_iteration (context=0x7f7187384880, may_block=1) at /build/buildd/glib2.0-2.31.22/./glib/gmain.c:3184
        retval = <optimized out>
#21 0x00007f7184c6da14 in g_application_run (application=0x7f71874f9210, argc=<optimized out>, argv=0x7fff47d450a8) at /build/buildd/glib2.0-2.31.22/./gio/gapplication.c:1496
        arguments = 0x7f71876d63d0
        status = 0
        i = <optimized out>
        __PRETTY_FUNCTION__ = "g_application_run"
#22 0x00007f71867fe75a in main (argc=1, argv=0x7fff47d450a8) at control-center.c:207
        shell = <optimized out>
        application = 0x7f71874f9210
        status = <optimized out>