.
Thread 3 (Thread 1937):
#0  0x00007f65568070c3 in __poll (fds=<value optimized out>, nfds=<value optimized out>, timeout=<value optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
        resultvar = 18446744073709551100
        oldtype = 0
        result = <value optimized out>
#1  0x00007f6556b17d68 in g_main_dispatch (context=0xffffffff) at /build/buildd/glib2.0-2.29.10/./glib/gmain.c:2424
        _g_boolean_var_ = 1
        source = <error reading variable source (Cannot access memory at address 0xfffffffffffffdfc)>
        current = 0x7f6556dc0f40
        i = 26589616
#2  g_main_context_dispatch (context=0xffffffff) at /build/buildd/glib2.0-2.29.10/./glib/gmain.c:3046
No locals.
#3  0x00007f6556823690 in ?? () at forward.c:184 from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#4  0x00007f6556dc0820 in ?? ()
No symbol table info available.
#5  0x00007f6556dc0808 in ?? ()
No symbol table info available.
#6  0x00007f6556823660 in ?? () at forward.c:182 from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#7  0x00007f654af84a0b in dconf_context_thread (data=<value optimized out>) at dconfcontext.c:11
        context = 0x7f6556dc0f40
        loop = <value optimized out>
        __PRETTY_FUNCTION__ = "dconf_context_thread"
#8  0x00007f6556b3d256 in g_once_init_enter_impl (value_location=0x0) at /build/buildd/glib2.0-2.29.10/./glib/gthread.c:1116
        need_init = 0
#9  0x00007f654af7f9c0 in ?? ()
No symbol table info available.
#10 0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 2 (Thread 1930):
#0  0x00007f65568070c3 in __poll (fds=<value optimized out>, nfds=<value optimized out>, timeout=<value optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
        resultvar = 18446744073709551100
        oldtype = 0
        result = <value optimized out>
#1  0x00007f6556b17d68 in g_main_dispatch (context=0xffffffff) at /build/buildd/glib2.0-2.29.10/./glib/gmain.c:2424
        _g_boolean_var_ = 1
        source = <error reading variable source (Cannot access memory at address 0xfffffffffffffdfc)>
        current = 0x7f6556dc0f40
        i = 26146800
#2  g_main_context_dispatch (context=0xffffffff) at /build/buildd/glib2.0-2.29.10/./glib/gmain.c:3046
No locals.
#3  0x00007f6556823690 in ?? () at forward.c:184 from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#4  0x00007f6556dc0820 in ?? ()
No symbol table info available.
#5  0x00007f6556dc0808 in ?? ()
No symbol table info available.
#6  0x00007f6556823660 in ?? () at forward.c:182 from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#7  0x00007f6557a6c6f6 in g_dbus_proxy_call_finish (proxy=0x3, res=0x1, error=<value optimized out>) at /build/buildd/glib2.0-2.29.10/./gio/gdbusproxy.c:2568
        simple = <value optimized out>
        __PRETTY_FUNCTION__ = "g_dbus_proxy_call_finish"
#8  0x00007f654cb8c9c0 in ?? ()
No symbol table info available.
#9  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 1 (Thread 1928):
#0  0x00007f655754b2ef in g_cclosure_marshal_VOID__BOOLEAN (closure=0x1a949c0, return_value=<value optimized out>, n_param_values=<value optimized out>, param_values=0x0, invocation_hint=<value optimized out>, marshal_data=0x1a949c0) at /build/buildd/glib2.0-2.29.10/./gobject/gmarshal.c:114
        callback = <value optimized out>
        cc = 0x1a949c0
        data1 = <value optimized out>
        data2 = <value optimized out>
        __PRETTY_FUNCTION__ = "g_cclosure_marshal_VOID__BOOLEAN"
#1  0x00007f65582fc220 in check_setugid () at /build/buildd/gtk+3.0-3.1.8/./gtk/gtkmain.c:431
        ruid = 27272592
        euid = <value optimized out>
        suid = 0
        rgid = <value optimized out>
        egid = <value optimized out>
        sgid = <value optimized out>
#2  0x00007f6558315efd in gtk_menu_shell_real_insert (menu_shell=0x1a949c0, child=0x50, position=27775024) at /build/buildd/gtk+3.0-3.1.8/./gtk/gtkmenushell.c:634
        priv = <value optimized out>
#3  0x00007ffff93d4120 in ?? ()
No symbol table info available.
#4  0x00000000019fa170 in ?? ()
No symbol table info available.
#5  0x0000000000000001 in ?? ()
No symbol table info available.
#6  0x00007f65582fc42d in synth_crossing_for_grab_notify (from=0x0, to=0x1891050, devices=0x0, mode=GDK_CROSSING_NORMAL, info=<value optimized out>) at /build/buildd/gtk+3.0-3.1.8/./gtk/gtkmain.c:2042
        device = <error reading variable device (Cannot access memory at address 0x0)>
        from_window = <value optimized out>
        to_window = <value optimized out>
#7  0x0000000001906610 in ?? ()
No symbol table info available.
#8  0x0000000001a7d030 in ?? ()
No symbol table info available.
#9  0x0000000001edcf40 in ?? ()
No symbol table info available.
#10 0x000000000193f090 in ?? ()
No symbol table info available.
#11 0x0000000001edc660 in ?? ()
No symbol table info available.
#12 0x00007f65575485f0 in value_to_ffi_type (gvalue=0x0, value=0x1891050) at /build/buildd/glib2.0-2.29.10/./gobject/gclosure.c:1008
        rettype = 0x1a02590
        type = <value optimized out>
        __PRETTY_FUNCTION__ = "value_to_ffi_type"
#13 0x0000000000000000 in ?? ()
No symbol table info available.