(gdb) bt
#0  0x00007ffff5534ea6 in QVariant::QVariant(QVariant const&) () from /usr/lib/libQtCore.so.4
#1  0x00007ffff6f88698 in QDBusPendingReplyData::argumentAt(int) const () from /usr/lib/libQtDBus.so.4
#2  0x00000000008bf31d in ?? ()
#3  0x00000000008bf12a in ?? ()
#4  0x00000000008be980 in ?? ()
#5  0x00000000008f789d in ?? ()
#6  0x00007ffff5525f11 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#7  0x00007ffff6f871bf in QDBusPendingCallWatcher::finished(QDBusPendingCallWatcher*) () from /usr/lib/libQtDBus.so.4
#8  0x00007ffff552b0d6 in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#9  0x00007ffff5d778c4 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#10 0x00007ffff5d7c743 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#11 0x00000000006a595e in ?? ()
#12 0x00007ffff551206c in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#13 0x00007ffff551590a in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQtCore.so.4
#14 0x00007ffff5540c93 in ?? () from /usr/lib/libQtCore.so.4
#15 0x00007ffff39dc8bd in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#16 0x00007ffff39dd0b8 in ?? () from /usr/lib/libglib-2.0.so.0
#17 0x00007ffff39dd289 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#18 0x00007ffff55410bf in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#19 0x00007ffff5e1af1e in ?? () from /usr/lib/libQtGui.so.4
#20 0x00007ffff5510e52 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#21 0x00007ffff55110a7 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#22 0x00007ffff5515c05 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#23 0x00000000008c9850 in ?? ()
#24 0x00007ffff44d038d in __libc_start_main () from /lib/libc.so.6
#25 0x0000000000468409 in ?? ()
#26 0x00007fffffffe128 in ?? ()
#27 0x00000000ffffffff in ?? ()
#28 0x0000000000000001 in ?? ()
#29 0x00007fffffffe4a1 in ?? ()
#30 0x0000000000000000 in ?? ()
(gdb) q
A debugging session is active.

        Inferior 1 [process 19222] will be killed.