Bug 353843

Application: systemsettings5 (5.4.1)

Qt Version: 5.5.0
Operating System: Linux 4.1.8-100.fc21.x86_64 x86_64
Distribution: "Fedora release 22 (Twenty Two)"

-- Information about the crash:
- What I was doing when the application crashed:
Windows starts to blink several times / seconds, some times uncompletely (flickering) when [ALT+TAB]

- Unusual behavior I noticed:
1. 
Update from F21 by fedup
Operation have stucked in some kind of mysterious black screen worm hole sucking down power and keeping the disk spinning > 5 hours ...
[CTRL+DEL] + [CTRL+DEL] 
soft reboot happen
Dracut menu show up but show F21 option and no more fedup
Choosed 1st option line :: boot in F21 normaly
system have Booted in F22 
Logged in F22 KDE normal accnt but graphic definitions and preferences are (almost all) lost.
Added PANEL default to TOP of the screen
Removed PANEL from bottom of the screen
Entered System Settings
Navigated to Windows MAnagement / Task Switcher 
Activated Cover Switch
Launched Firefox in order to have windows to switch
Then.... 
Windows start flickering...

2.
Clicked on Conver Swich  - System settings (the button on the right on the combo box in order to look up for options to fix the "strange behavior" and Windows have lost their focus.
When switching Windows [ALT+TAB] Windows does not switch until they are CLICKED.

3.
ALL MY DESKTOPS are GONE + more tons of other definitions
and WHERE is GONE the SEARCH and LAUNCH desktop ???
WHEN do Fedora TEAM undestand DELTA between RELEASE CANDIDATE and STABLE ?
I each season manage hundreds (really HUNDREDS) on Fedora installation and recommends to new users !
EACH TIME I have to face legit criticisms from users !!!
(I know that this last part is to repport to another right place (and I will do) but it came out from hearth right now AND for sure I am not the only one to be REFRAINED by that...).

-- Backtrace:
Application: System Settings (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f0d21bc6840 (LWP 4550))]

Thread 5 (Thread 0x7f0d05fec700 (LWP 4551)):
#0  0x00007f0d1bee42fd in poll () at /lib64/libc.so.6
#1  0x00007f0d18e37182 in _xcb_conn_wait () at /lib64/libxcb.so.1
#2  0x00007f0d18e38c77 in xcb_wait_for_event () at /lib64/libxcb.so.1
#3  0x00007f0d09019999 in QXcbEventReader::run() () at /lib64/libQt5XcbQpa.so.5
#4  0x00007f0d1caf054e in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#5  0x00007f0d185f4555 in start_thread () at /lib64/libpthread.so.0
#6  0x00007f0d1beefb9d in clone () at /lib64/libc.so.6

Thread 4 (Thread 0x7f0cf8a90700 (LWP 4553)):
#0  0x00007f0d185f9540 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f0cfba246da in radeon_drm_cs_emit_ioctl () at /usr/lib64/dri/r600_dri.so
#2  0x00007f0cfba23e37 in impl_thrd_routine () at /usr/lib64/dri/r600_dri.so
#3  0x00007f0d185f4555 in start_thread () at /lib64/libpthread.so.0
#4  0x00007f0d1beefb9d in clone () at /lib64/libc.so.6

Thread 3 (Thread 0x7f0cf4ca6700 (LWP 4723)):
#0  0x00007f0d1bee42fd in poll () at /lib64/libc.so.6
#1  0x00007f0d1783ddbc in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#2  0x00007f0d1783e142 in g_main_loop_run () at /lib64/libglib-2.0.so.0
#3  0x00007f0cf4d86696 in gdbus_shared_thread_func () at /lib64/libgio-2.0.so.0
#4  0x00007f0d178650a5 in g_thread_proxy () at /lib64/libglib-2.0.so.0
#5  0x00007f0d185f4555 in start_thread () at /lib64/libpthread.so.0
#6  0x00007f0d1beefb9d in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7f0ce515f700 (LWP 6177)):
#0  0x00007f0d1befd6a7 in __libc_disable_asynccancel () at /lib64/libc.so.6
#1  0x00007f0d1bedffb9 in read () at /lib64/libc.so.6
#2  0x00007f0d17881b00 in g_wakeup_acknowledge () at /lib64/libglib-2.0.so.0
#3  0x00007f0d1783d8b4 in g_main_context_check () at /lib64/libglib-2.0.so.0
#4  0x00007f0d1783dd60 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#5  0x00007f0d1783decc in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#6  0x00007f0d1cd27dab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#7  0x00007f0d1cccedaa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#8  0x00007f0d1caeb5a4 in QThread::exec() () at /lib64/libQt5Core.so.5
#9  0x00007f0d1b2c1245 in QQmlThreadPrivate::run() () at /lib64/libQt5Qml.so.5
#10 0x00007f0d1caf054e in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#11 0x00007f0d185f4555 in start_thread () at /lib64/libpthread.so.0
#12 0x00007f0d1beefb9d in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7f0d21bc6840 (LWP 4550)):
[KCrash Handler]
#5  0x00007f0d1b1d38f5 in QV4::Heap::StringObject::StringObject(QV4::ExecutionEngine*, QV4::Value const&) () at /lib64/libQt5Qml.so.5
#6  0x00007f0d1b17ab43 in QV4::ExecutionEngine::newStringObject(QV4::Value const&) () at /lib64/libQt5Qml.so.5
#7  0x00007f0d1b213a72 in QV4::Runtime::getProperty(QV4::ExecutionEngine*, QV4::Value const&, int) () at /lib64/libQt5Qml.so.5
#8  0x00007f0ce426424d in  ()
#9  0x00007ffdffdc9cd0 in  ()
#10 0x00007f0ce01a086c in  ()
#11 0x000000000268db20 in  ()
#12 0x0000000002506dd0 in  ()
#13 0x0000000000000003 in  ()
#14 0x00007f0d1b225b51 in QQmlVMEMetaObject::metaCall(QMetaObject::Call, int, void**) () at /lib64/libQt5Qml.so.5
#15 0x00007f0cdea13010 in  ()
#16 0x00000000031262f0 in  ()
#17 0x00007f0cdea13018 in  ()
#18 0x00007f0cdea13058 in  ()
#19 0x00007f0d1b2a672f in QQmlJavaScriptExpression::evaluate(QQmlContextData*, QV4::Value const&, QV4::CallData*, bool*) () at /lib64/libQt5Qml.so.5
#20 0x00007f0d1b2a6c5d in QQmlJavaScriptExpression::evaluate(QQmlContextData*, QV4::Value const&, bool*) () at /lib64/libQt5Qml.so.5
#21 0x00007f0d1b2ad79c in QQmlBinding::update(QFlags<QQmlPropertyPrivate::WriteFlag>) () at /lib64/libQt5Qml.so.5
#22 0x00007f0d1b2adc5e in QQmlBinding::expressionChanged(QQmlJavaScriptExpression*) () at /lib64/libQt5Qml.so.5
#23 0x00007f0d1b289c57 in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) () at /lib64/libQt5Qml.so.5
#24 0x00007f0d1b289c1e in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) () at /lib64/libQt5Qml.so.5
#25 0x00007f0d1b289c1e in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) () at /lib64/libQt5Qml.so.5
#26 0x00007f0d1b289c1e in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) () at /lib64/libQt5Qml.so.5
#27 0x00007f0d1b289c1e in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) () at /lib64/libQt5Qml.so.5
#28 0x00007f0d1b22ca0c in QQmlData::signalEmitted(QAbstractDeclarativeData*, QObject*, int, void**) () at /lib64/libQt5Qml.so.5
#29 0x00007f0d1ccffa60 in QMetaObject::activate(QObject*, int, int, void**) () at /lib64/libQt5Core.so.5
#30 0x00007f0d1b2260de in QQmlVMEMetaObject::metaCall(QMetaObject::Call, int, void**) () at /lib64/libQt5Qml.so.5
#31 0x00007f0d1b2256a7 in QQmlVMEMetaObject::metaCall(QMetaObject::Call, int, void**) () at /lib64/libQt5Qml.so.5
#32 0x00007f0d1b23d780 in QQmlPropertyPrivate::write(QObject*, QQmlPropertyData const&, QVariant const&, QQmlContextData*, QFlags<QQmlPropertyPrivate::WriteFlag>) () at /lib64/libQt5Qml.so.5
#33 0x00007f0d1b23f29b in QQmlPropertyPrivate::writeValueProperty(QObject*, QQmlPropertyData const&, QVariant const&, QQmlContextData*, QFlags<QQmlPropertyPrivate::WriteFlag>) () at /lib64/libQt5Qml.so.5
#34 0x00007f0d1b23fcec in QQmlPropertyPrivate::writeBinding(QObject*, QQmlPropertyData const&, QQmlContextData*, QQmlJavaScriptExpression*, QV4::Value const&, bool, QFlags<QQmlPropertyPrivate::WriteFlag>) () at /lib64/libQt5Qml.so.5
#35 0x00007f0d1b2ad82f in QQmlBinding::update(QFlags<QQmlPropertyPrivate::WriteFlag>) () at /lib64/libQt5Qml.so.5
#36 0x00007f0d1b2adc5e in QQmlBinding::expressionChanged(QQmlJavaScriptExpression*) () at /lib64/libQt5Qml.so.5
#37 0x00007f0d1b289c57 in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) () at /lib64/libQt5Qml.so.5
#38 0x00007f0d1b22ca0c in QQmlData::signalEmitted(QAbstractDeclarativeData*, QObject*, int, void**) () at /lib64/libQt5Qml.so.5
#39 0x00007f0d1ccffa60 in QMetaObject::activate(QObject*, int, int, void**) () at /lib64/libQt5Core.so.5
#40 0x00007f0d1b84c795 in QQuickLoaderPrivate::incubatorStateChanged(QQmlIncubator::Status) () at /lib64/libQt5Quick.so.5
#41 0x00007f0d1b24653e in QQmlIncubatorPrivate::incubate(QQmlInstantiationInterrupt&) () at /lib64/libQt5Qml.so.5
#42 0x00007f0d1b24680f in QQmlEnginePrivate::incubate(QQmlIncubator&, QQmlContextData*) () at /lib64/libQt5Qml.so.5
#43 0x00007f0d1b24208c in QQmlComponent::create(QQmlIncubator&, QQmlContext*, QQmlContext*) () at /lib64/libQt5Qml.so.5
#44 0x00007f0d1b84b57a in QQuickLoaderPrivate::_q_sourceLoaded() () at /lib64/libQt5Quick.so.5
#45 0x00007f0d1b84b718 in QQuickLoaderPrivate::load() () at /lib64/libQt5Quick.so.5
#46 0x00007f0d1b2b6e12 in QQmlObjectCreator::finalize(QQmlInstantiationInterrupt&) () at /lib64/libQt5Qml.so.5
#47 0x00007f0d1b241a4e in QQmlComponentPrivate::complete(QQmlEnginePrivate*, QQmlComponentPrivate::ConstructionState*) () at /lib64/libQt5Qml.so.5
#48 0x00007f0d1b241b17 in QQmlComponentPrivate::completeCreate() () at /lib64/libQt5Qml.so.5
#49 0x00007f0d1b241980 in QQmlComponent::create(QQmlContext*) () at /lib64/libQt5Qml.so.5
#50 0x00007f0d1b85295d in QQuickView::continueExecute() () at /lib64/libQt5Quick.so.5
#51 0x00007f0d1b85309d in QQuickViewPrivate::execute() () at /lib64/libQt5Quick.so.5
#52 0x00007f0ce517402e in KWin::Compositing::EffectView::init(KWin::Compositing::EffectView::ViewType) () at /usr/lib64/qt5/plugins/kwincompositing.so
#53 0x00007f0ce517472d in KWin::Compositing::EffectView::EffectView(KWin::Compositing::EffectView::ViewType, QWindow*) () at /usr/lib64/qt5/plugins/kwincompositing.so
#54 0x00007f0ce517f21d in KWinCompositingKCM::KWinCompositingKCM(QWidget*, QList<QVariant> const&, KWin::Compositing::EffectView::ViewType) () at /usr/lib64/qt5/plugins/kwincompositing.so
#55 0x00007f0ce518094d in QObject* KPluginFactory::createInstance<KWinDesktopEffects, QWidget>(QWidget*, QObject*, QList<QVariant> const&) () at /usr/lib64/qt5/plugins/kwincompositing.so
#56 0x00007f0d1d163030 in KPluginFactory::create(char const*, QWidget*, QObject*, QList<QVariant> const&, QString const&) () at /lib64/libKF5CoreAddons.so.5
#57 0x00007f0d215e0195 in KCModuleLoader::loadModule(KCModuleInfo const&, KCModuleLoader::ErrorReporting, QWidget*, QStringList const&) () at /lib64/libKF5KCMUtils.so.5
#58 0x00007f0d215e8a6f in KCModuleProxyPrivate::loadModule() () at /lib64/libKF5KCMUtils.so.5
#59 0x00007f0d215e9675 in KCModuleProxy::realModule() const () at /lib64/libKF5KCMUtils.so.5
#60 0x00007f0d215e9c73 in KCModuleProxy::showEvent(QShowEvent*) () at /lib64/libKF5KCMUtils.so.5
#61 0x00007f0d1e82e5d8 in QWidget::event(QEvent*) () at /lib64/libQt5Widgets.so.5
#62 0x00007f0d1e7eb4ac in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#63 0x00007f0d1e7f0976 in QApplication::notify(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#64 0x00007f0d1ccd161b in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /lib64/libQt5Core.so.5
#65 0x00007f0d1e82b226 in QWidgetPrivate::show_helper() () at /lib64/libQt5Widgets.so.5
#66 0x00007f0d1e82af16 in QWidgetPrivate::showChildren(bool) () at /lib64/libQt5Widgets.so.5
#67 0x00007f0d1e82afaf in QWidgetPrivate::show_helper() () at /lib64/libQt5Widgets.so.5
#68 0x00007f0d1e82dc65 in QWidget::setVisible(bool) () at /lib64/libQt5Widgets.so.5
#69 0x00007f0d1e82af28 in QWidgetPrivate::showChildren(bool) () at /lib64/libQt5Widgets.so.5
#70 0x00007f0d1e82afaf in QWidgetPrivate::show_helper() () at /lib64/libQt5Widgets.so.5
#71 0x00007f0d1e82dc65 in QWidget::setVisible(bool) () at /lib64/libQt5Widgets.so.5
#72 0x00007f0d1e8105a9 in QStackedLayout::setCurrentIndex(int) () at /lib64/libQt5Widgets.so.5
#73 0x00007f0d1e810794 in QStackedLayout::setCurrentWidget(QWidget*) () at /lib64/libQt5Widgets.so.5
#74 0x00007f0d1e98a541 in QStackedWidget::setCurrentWidget(QWidget*) () at /lib64/libQt5Widgets.so.5
#75 0x00007f0d1f011f29 in KPageViewPrivate::_k_pageSelected(QItemSelection const&, QItemSelection const&) () at /lib64/libKF5WidgetsAddons.so.5
#76 0x00007f0d1f012ca1 in KPageView::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) () at /lib64/libKF5WidgetsAddons.so.5
#77 0x00007f0d1cd0015a in QMetaObject::activate(QObject*, int, int, void**) () at /lib64/libQt5Core.so.5
#78 0x00007f0d1cc81fc7 in QItemSelectionModel::selectionChanged(QItemSelection const&, QItemSelection const&) () at /lib64/libQt5Core.so.5
#79 0x00007f0d1cc863cc in QItemSelectionModel::emitSelectionChanged(QItemSelection const&, QItemSelection const&) () at /lib64/libQt5Core.so.5
#80 0x00007f0d1cc888b4 in QItemSelectionModel::select(QItemSelection const&, QFlags<QItemSelectionModel::SelectionFlag>) () at /lib64/libQt5Core.so.5
#81 0x00007f0d1ea6a030 in QListView::setSelection(QRect const&, QFlags<QItemSelectionModel::SelectionFlag>) () at /lib64/libQt5Widgets.so.5
#82 0x00007f0d1ea4b59d in QAbstractItemView::mousePressEvent(QMouseEvent*) () at /lib64/libQt5Widgets.so.5
#83 0x00007f0d1e82ea1f in QWidget::event(QEvent*) () at /lib64/libQt5Widgets.so.5
#84 0x00007f0d1e92d5de in QFrame::event(QEvent*) () at /lib64/libQt5Widgets.so.5
#85 0x00007f0d1ea52b5b in QAbstractItemView::viewportEvent(QEvent*) () at /lib64/libQt5Widgets.so.5
#86 0x00007f0d1ccd140c in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () at /lib64/libQt5Core.so.5
#87 0x00007f0d1e7eb48c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#88 0x00007f0d1e7f1079 in QApplication::notify(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#89 0x00007f0d1ccd161b in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /lib64/libQt5Core.so.5
#90 0x00007f0d1e7eff82 in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () at /lib64/libQt5Widgets.so.5
#91 0x00007f0d1e848d8b in QWidgetWindow::handleMouseEvent(QMouseEvent*) () at /lib64/libQt5Widgets.so.5
#92 0x00007f0d1e84b33b in QWidgetWindow::event(QEvent*) () at /lib64/libQt5Widgets.so.5
#93 0x00007f0d1e7eb4ac in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#94 0x00007f0d1e7f0976 in QApplication::notify(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#95 0x00007f0d1ccd161b in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /lib64/libQt5Core.so.5
#96 0x00007f0d1e03eaf1 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () at /lib64/libQt5Gui.so.5
#97 0x00007f0d1e0407c5 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () at /lib64/libQt5Gui.so.5
#98 0x00007f0d1e0245d8 in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Gui.so.5
#99 0x00007f0d0904ab10 in userEventSourceDispatch(_GSource*, int (*)(void*), void*) () at /lib64/libQt5XcbQpa.so.5
#100 0x00007f0d1783da8a in g_main_context_dispatch () at /lib64/libglib-2.0.so.0
#101 0x00007f0d1783de20 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#102 0x00007f0d1783decc in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#103 0x00007f0d1cd27d8f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#104 0x00007f0d1cccedaa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#105 0x00007f0d1ccd6e6c in QCoreApplication::exec() () at /lib64/libQt5Core.so.5
#106 0x000000000040ea5b in main ()

Possible duplicates by query: bug 353795, bug 353225, bug 353221, bug 351767.

Reported using DrKonqi