Application: systemsettings5 (5.3.0)

Qt Version: 5.4.1
Operating System: Linux 4.0.4-301.fc22.x86_64 x86_64
Distribution: "Fedora release 22 (Twenty Two)"

-- Information about the crash:
- What I was doing when the application crashed:
Just launched system settings in fedora22. Sometimes seen the  settings does not launch at all

-- Backtrace:
Application: System Settings (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7efc0082c840 (LWP 1494))]

Thread 3 (Thread 0x7efbe54cf700 (LWP 1495)):
#0  0x00007efbfab3a66d in poll () from /lib64/libc.so.6
#1  0x00007efbf7aab182 in _xcb_conn_wait () from /lib64/libxcb.so.1
#2  0x00007efbf7aaccff in xcb_wait_for_event () from /lib64/libxcb.so.1
#3  0x00007efbe7eb45e9 in QXcbEventReader::run() () from /usr/lib64/qt5/plugins/platforms/libqxcb.so
#4  0x00007efbfb744ede in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#5  0x00007efbf7268555 in start_thread () from /lib64/libpthread.so.0
#6  0x00007efbfab45f3d in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7efbd687a700 (LWP 1669)):
#0  0x00007efbf64f8ef0 in g_mutex_unlock () from /lib64/libglib-2.0.so.0
#1  0x00007efbf64b33e0 in g_main_context_prepare () from /lib64/libglib-2.0.so.0
#2  0x00007efbf64b3ceb in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#3  0x00007efbf64b4142 in g_main_loop_run () from /lib64/libglib-2.0.so.0
#4  0x00007efbd695a696 in gdbus_shared_thread_func () from /lib64/libgio-2.0.so.0
#5  0x00007efbf64db0a5 in g_thread_proxy () from /lib64/libglib-2.0.so.0
#6  0x00007efbf7268555 in start_thread () from /lib64/libpthread.so.0
#7  0x00007efbfab45f3d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7efc0082c840 (LWP 1494)):
[KCrash Handler]
#5  0x00007efbfd444576 in QWidget::windowHandle() const () from /lib64/libQt5Widgets.so.5
#6  0x00007efbfd44b441 in QWidget::activateWindow() () from /lib64/libQt5Widgets.so.5
#7  0x00007efbfb954ad7 in QMetaObject::activate(QObject*, int, int, void**) () from /lib64/libQt5Core.so.5
#8  0x00007efbfc4db0c7 in KDBusService::activateRequested(QStringList const&, QString const&) () from /lib64/libKF5DBusAddons.so.5
#9  0x00007efbfc4d7198 in KDBusService::Activate(QMap<QString, QVariant> const&) () from /lib64/libKF5DBusAddons.so.5
#10 0x00007efbfc4dae72 in KDBusServiceAdaptor::qt_metacall(QMetaObject::Call, int, void**) () from /lib64/libKF5DBusAddons.so.5
#11 0x00007efbfc27038e in QDBusConnectionPrivate::deliverCall(QObject*, int, QDBusMessage const&, QVector<int> const&, int) () from /lib64/libQt5DBus.so.5
#12 0x00007efbfc2744e0 in QDBusConnectionPrivate::activateCall(QObject*, int, QDBusMessage const&) () from /lib64/libQt5DBus.so.5
#13 0x00007efbfc274c23 in QDBusConnectionPrivate::activateObject(QDBusConnectionPrivate::ObjectTreeNode&, QDBusMessage const&, int) () from /lib64/libQt5DBus.so.5
#14 0x00007efbfc275eee in QDBusActivateObjectEvent::placeMetaCall(QObject*) () from /lib64/libQt5DBus.so.5
#15 0x00007efbfb955b11 in QObject::event(QEvent*) () from /lib64/libQt5Core.so.5
#16 0x00007efbfd4197cc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#17 0x00007efbfd41ee70 in QApplication::notify(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#18 0x00007efbfb92424b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /lib64/libQt5Core.so.5
#19 0x00007efbfb926387 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /lib64/libQt5Core.so.5
#20 0x00007efbfb97b333 in postEventSourceDispatch(_GSource*, int (*)(void*), void*) () from /lib64/libQt5Core.so.5
#21 0x00007efbf64b3a8a in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#22 0x00007efbf64b3e20 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#23 0x00007efbf64b3ecc in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#24 0x00007efbfb97b73f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#25 0x00007efbfb921a8a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#26 0x00007efbfb9295fc in QCoreApplication::exec() () from /lib64/libQt5Core.so.5
#27 0x000000000040eb2c in main ()

Reported using DrKonqi