User-Agent:       Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101
Firefox/60.0
Build Identifier: 

if you open Systemsettings5 and choose "Desktop behavior" -> "Desktop effects" 
it ends with crash 

Backtrase:  

Application: Systeeminstellingen (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fa1f5bd4480 (LWP 7710))]

Thread 4 (Thread 0x7fa1c8d07700 (LWP 7715)):
#0  0x00007fa1ea95835f in g_main_context_iteration () from
/usr/lib64/libglib-2.0.so.0
#1  0x00007fa1f1cfa96b in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
from /usr/lib64/libQt5Core.so.5
#2  0x00007fa1f1c9f90a in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from
/usr/lib64/libQt5Core.so.5
#3  0x00007fa1f1abddaa in QThread::exec() () from /usr/lib64/libQt5Core.so.5
#4  0x00007fa1ef9449f5 in ?? () from /usr/lib64/libQt5Qml.so.5
#5  0x00007fa1f1ac2ced in ?? () from /usr/lib64/libQt5Core.so.5
#6  0x00007fa1ecd6e559 in start_thread () from /lib64/libpthread.so.0
#7  0x00007fa1f13bf9af in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x7fa1d9142700 (LWP 7713)):
#0  0x00007fa1ea99e019 in g_mutex_lock () from /usr/lib64/libglib-2.0.so.0
#1  0x00007fa1ea957c74 in g_main_context_check () from
/usr/lib64/libglib-2.0.so.0
#2  0x00007fa1ea9581f0 in ?? () from /usr/lib64/libglib-2.0.so.0
#3  0x00007fa1ea95835c in g_main_context_iteration () from
/usr/lib64/libglib-2.0.so.0
#4  0x00007fa1f1cfa96b in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
from /usr/lib64/libQt5Core.so.5
#5  0x00007fa1f1c9f90a in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from
/usr/lib64/libQt5Core.so.5
#6  0x00007fa1f1abddaa in QThread::exec() () from /usr/lib64/libQt5Core.so.5
#7  0x00007fa1f217a9e5 in ?? () from /usr/lib64/libQt5DBus.so.5
#8  0x00007fa1f1ac2ced in ?? () from /usr/lib64/libQt5Core.so.5
#9  0x00007fa1ecd6e559 in start_thread () from /lib64/libpthread.so.0
#10 0x00007fa1f13bf9af in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7fa1e212f700 (LWP 7712)):
#0  0x00007fa1f13b515b in poll () from /lib64/libc.so.6
#1  0x00007fa1ec934307 in ?? () from /usr/lib64/libxcb.so.1
#2  0x00007fa1ec935f3a in xcb_wait_for_event () from /usr/lib64/libxcb.so.1
#3  0x00007fa1e48ba759 in ?? () from /usr/lib64/libQt5XcbQpa.so.5
#4  0x00007fa1f1ac2ced in ?? () from /usr/lib64/libQt5Core.so.5
#5  0x00007fa1ecd6e559 in start_thread () from /lib64/libpthread.so.0
#6  0x00007fa1f13bf9af in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7fa1f5bd4480 (LWP 7710)):
[KCrash Handler]
#6  0x00007fa1f1cd833a in QObject::setProperty(char const*, QVariant const&) ()
from /usr/lib64/libQt5Core.so.5
#7  0x00007fa1ca852581 in ?? () from /usr/lib64/qt5/plugins/kwincompositing.so
#8  0x00007fa1ca8527d7 in ?? () from /usr/lib64/qt5/plugins/kwincompositing.so
#9  0x00007fa1ca857bb1 in ?? () from /usr/lib64/qt5/plugins/kwincompositing.so
#10 0x00007fa1ca858c3d in ?? () from /usr/lib64/qt5/plugins/kwincompositing.so
#11 0x00007fa1f38a6e99 in KPluginFactory::create(char const*, QWidget*,
QObject*, QList<QVariant> const&, QString const&) () from
/usr/lib64/libKF5CoreAddons.so.5
#12 0x00007fa1f55ba17c in KCModuleLoader::loadModule(KCModuleInfo const&,
KCModuleLoader::ErrorReporting, QWidget*, QStringList const&) () from
/usr/lib64/libKF5KCMUtils.so.5
#13 0x00007fa1f55c1a0f in ?? () from /usr/lib64/libKF5KCMUtils.so.5
#14 0x00007fa1f55c2548 in KCModuleProxy::realModule() const () from
/usr/lib64/libKF5KCMUtils.so.5
#15 0x00007fa1f55c2a73 in KCModuleProxy::showEvent(QShowEvent*) () from
/usr/lib64/libKF5KCMUtils.so.5
#16 0x00007fa1f2d14be8 in QWidget::event(QEvent*) () from
/usr/lib64/libQt5Widgets.so.5
#17 0x00007fa1f2cd63dc in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() from /usr/lib64/libQt5Widgets.so.5
#18 0x00007fa1f2cddca4 in QApplication::notify(QObject*, QEvent*) () from
/usr/lib64/libQt5Widgets.so.5
#19 0x00007fa1f1ca18d8 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
() from /usr/lib64/libQt5Core.so.5
#20 0x00007fa1f2d11ab8 in QWidgetPrivate::show_helper() () from
/usr/lib64/libQt5Widgets.so.5
#21 0x00007fa1f2d1198e in QWidgetPrivate::showChildren(bool) () from
/usr/lib64/libQt5Widgets.so.5
#22 0x00007fa1f2d11a8f in QWidgetPrivate::show_helper() () from
/usr/lib64/libQt5Widgets.so.5
#23 0x00007fa1f2d1478b in QWidget::setVisible(bool) () from
/usr/lib64/libQt5Widgets.so.5
#24 0x00007fa1f2d119e0 in QWidgetPrivate::showChildren(bool) () from
/usr/lib64/libQt5Widgets.so.5
#25 0x00007fa1f2d11a8f in QWidgetPrivate::show_helper() () from
/usr/lib64/libQt5Widgets.so.5
#26 0x00007fa1f2d1478b in QWidget::setVisible(bool) () from
/usr/lib64/libQt5Widgets.so.5
#27 0x00007fa1f2cf8af7 in QStackedLayout::setCurrentIndex(int) () from
/usr/lib64/libQt5Widgets.so.5
#28 0x00007fa1f2cf8e04 in QStackedLayout::setCurrentWidget(QWidget*) () from
/usr/lib64/libQt5Widgets.so.5
#29 0x00007fa1f2e80051 in QStackedWidget::setCurrentWidget(QWidget*) () from
/usr/lib64/libQt5Widgets.so.5
#30 0x00007fa1f4307d80 in ?? () from /usr/lib64/libKF5WidgetsAddons.so.5
#31 0x00007fa1f1cd0535 in QMetaObject::activate(QObject*, int, int, void**) ()
from /usr/lib64/libQt5Core.so.5
#32 0x00007fa1f1c4d1d7 in QItemSelectionModel::selectionChanged(QItemSelection
const&, QItemSelection const&) () from /usr/lib64/libQt5Core.so.5
#33 0x00007fa1f1c52085 in
QItemSelectionModel::emitSelectionChanged(QItemSelection const&, QItemSelection
const&) () from /usr/lib64/libQt5Core.so.5
#34 0x00007fa1f1c54c43 in QItemSelectionModel::select(QItemSelection const&,
QFlags<QItemSelectionModel::SelectionFlag>) () from /usr/lib64/libQt5Core.so.5
#35 0x00007fa1f2f5b662 in QListView::setSelection(QRect const&,
QFlags<QItemSelectionModel::SelectionFlag>) () from
/usr/lib64/libQt5Widgets.so.5
#36 0x00007fa1f2f24519 in QAbstractItemView::mousePressEvent(QMouseEvent*) ()
from /usr/lib64/libQt5Widgets.so.5
#37 0x00007fa1f2d1553f in QWidget::event(QEvent*) () from
/usr/lib64/libQt5Widgets.so.5
#38 0x00007fa1f2db5eee in QFrame::event(QEvent*) () from
/usr/lib64/libQt5Widgets.so.5
#39 0x00007fa1f2f2956b in QAbstractItemView::viewportEvent(QEvent*) () from
/usr/lib64/libQt5Widgets.so.5
#40 0x00007fa1f1ca15bc in
QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) ()
from /usr/lib64/libQt5Core.so.5
#41 0x00007fa1f2cd63b5 in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() from /usr/lib64/libQt5Widgets.so.5
#42 0x00007fa1f2cde1ff in QApplication::notify(QObject*, QEvent*) () from
/usr/lib64/libQt5Widgets.so.5
#43 0x00007fa1f1ca18d8 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
() from /usr/lib64/libQt5Core.so.5
#44 0x00007fa1f2cdd1d2 in QApplicationPrivate::sendMouseEvent(QWidget*,
QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () from
/usr/lib64/libQt5Widgets.so.5
#45 0x00007fa1f2d2fd0b in ?? () from /usr/lib64/libQt5Widgets.so.5
#46 0x00007fa1f2d3237a in ?? () from /usr/lib64/libQt5Widgets.so.5
#47 0x00007fa1f2cd63dc in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() from /usr/lib64/libQt5Widgets.so.5
#48 0x00007fa1f2cddca4 in QApplication::notify(QObject*, QEvent*) () from
/usr/lib64/libQt5Widgets.so.5
#49 0x00007fa1f1ca18d8 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
() from /usr/lib64/libQt5Core.so.5
#50 0x00007fa1f2502ea3 in
QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*)
() from /usr/lib64/libQt5Gui.so.5
#51 0x00007fa1f2504975 in
QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*)
() from /usr/lib64/libQt5Gui.so.5
#52 0x00007fa1f24dbc0b in
QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>)
() from /usr/lib64/libQt5Gui.so.5
#53 0x00007fa1e491d810 in ?? () from /usr/lib64/libQt5XcbQpa.so.5
#54 0x00007fa1ea958097 in g_main_context_dispatch () from
/usr/lib64/libglib-2.0.so.0
#55 0x00007fa1ea9582d0 in ?? () from /usr/lib64/libglib-2.0.so.0
#56 0x00007fa1ea95835c in g_main_context_iteration () from
/usr/lib64/libglib-2.0.so.0
#57 0x00007fa1f1cfa94f in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
from /usr/lib64/libQt5Core.so.5
#58 0x00007fa1f1c9f90a in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from
/usr/lib64/libQt5Core.so.5
#59 0x00007fa1f1ca89b4 in QCoreApplication::exec() () from
/usr/lib64/libQt5Core.so.5
#60 0x00005599537109c0 in main (argc=<optimized out>, argv=<optimized out>) at
/usr/src/debug/systemsettings5-5.12.7-lp151.1.4.x86_64/app/main.cpp:70
[Inferior 1 (process 7710) detached]


Reproducible: Always