Application: systemsettings5 (5.9.5)

Qt Version: 5.7.1
Frameworks Version: 5.34.0
Operating System: Linux 4.11.6-201.fc25.x86_64 x86_64
Distribution: "Fedora release 25 (Twenty Five)"

-- Information about the crash:
- What I was doing when the application crashed:

Applied QtCurve style, pressed Configuration button. Crashed.

I think is a qtcurve (1.8.18) related issue...

The crash can be reproduced every time.

-- Backtrace:
Application: Impostazioni di sistema (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f48fb7ad8c0 (LWP 5516))]

Thread 3 (Thread 0x7f48ed51d700 (LWP 5518)):
#0  0x00007f4906bc8d74 in QMutex::unlock() () at /lib64/libQt5Core.so.5
#1  0x00007f4906dbe5c1 in postEventSourcePrepare(_GSource*, int*) () at /lib64/libQt5Core.so.5
#2  0x00007f48fee1f69d in g_main_context_prepare () at /lib64/libglib-2.0.so.0
#3  0x00007f48fee2008b in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#4  0x00007f48fee2027c in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#5  0x00007f4906dbe6eb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#6  0x00007f4906d6f68a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#7  0x00007f4906bcc5e3 in QThread::exec() () at /lib64/libQt5Core.so.5
#8  0x00007f49074bdfb9 in QDBusConnectionManager::run() () at /lib64/libQt5DBus.so.5
#9  0x00007f4906bd09ca in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#10 0x00007f490308673a in start_thread () at /lib64/libpthread.so.0
#11 0x00007f4905fc3e0f in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7f48f6e89700 (LWP 5517)):
#0  0x00007f4905fb7ecd in poll () at /lib64/libc.so.6
#1  0x00007f49036c7d10 in _xcb_conn_wait () at /lib64/libxcb.so.1
#2  0x00007f49036c9aa9 in xcb_wait_for_event () at /lib64/libxcb.so.1
#3  0x00007f48fb536d69 in QXcbEventReader::run() () at /lib64/libQt5XcbQpa.so.5
#4  0x00007f4906bd09ca in QThreadPrivate::start(void*) () at /lib64/libQt5Core.so.5
#5  0x00007f490308673a in start_thread () at /lib64/libpthread.so.0
#6  0x00007f4905fc3e0f in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7f48fb7ad8c0 (LWP 5516)):
[KCrash Handler]
#6  0x00007f4907d356f4 in QWindow::type() const () at /lib64/libQt5Gui.so.5
#7  0x00007f4907d3ab72 in QWindow::winId() const () at /lib64/libQt5Gui.so.5
#8  0x00007f48f6023c19 in QDBusMenuBar::unregisterMenuBar() () at /usr/lib64/qt5/plugins/platformthemes/KDEPlasmaPlatformTheme.so
#9  0x00007f48f60241fd in QDBusMenuBar::handleReparent(QWindow*) () at /usr/lib64/qt5/plugins/platformthemes/KDEPlasmaPlatformTheme.so
#10 0x00007f49083b7e4c in QMenuBarPrivate::handleReparent() () at /lib64/libQt5Widgets.so.5
#11 0x00007f49083b8b25 in QMenuBar::eventFilter(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#12 0x00007f4906d704e2 in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () at /lib64/libQt5Core.so.5
#13 0x00007f490823aea5 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#14 0x00007f4908242671 in QApplication::notify(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#15 0x00007f4906d706fa in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /lib64/libQt5Core.so.5
#16 0x00007f4908283936 in QWidget::setParent(QWidget*, QFlags<Qt::WindowType>) () at /lib64/libQt5Widgets.so.5
#17 0x00007f49082846fc in QWidget::setParent(QWidget*) () at /lib64/libQt5Widgets.so.5
#18 0x00007f490825dd96 in QLayout::addChildWidget(QWidget*) () at /lib64/libQt5Widgets.so.5
#19 0x00007f490825de0f in QLayout::addWidget(QWidget*) () at /lib64/libQt5Widgets.so.5
#20 0x00007f490839ecac in QMdiSubWindow::setWidget(QWidget*) () at /lib64/libQt5Widgets.so.5
#21 0x00007f4908392e03 in QMdiArea::addSubWindow(QWidget*, QFlags<Qt::WindowType>) () at /lib64/libQt5Widgets.so.5
#22 0x00007f48e287a2e5 in QtCurveConfig::previewControlPressed() () at /usr/lib64/qt5/plugins/kstyle_qtcurve5_config.so
#23 0x00007f48e287a419 in QtCurveConfig::setupPreview() () at /usr/lib64/qt5/plugins/kstyle_qtcurve5_config.so
#24 0x00007f48e2888079 in QtCurveConfig::QtCurveConfig(QWidget*) () at /usr/lib64/qt5/plugins/kstyle_qtcurve5_config.so
#25 0x00007f48e28881c1 in allocate_kstyle_config () at /usr/lib64/qt5/plugins/kstyle_qtcurve5_config.so
#26 0x00007f48e3c2b0e4 in KCMStyle::styleSpecificConfig() () at /usr/lib64/qt5/plugins/kcm_style.so
#27 0x00007f4906d97a56 in QMetaObject::activate(QObject*, int, int, void**) () at /lib64/libQt5Core.so.5
#28 0x00007f4908323a12 in QAbstractButton::clicked(bool) () at /lib64/libQt5Widgets.so.5
#29 0x00007f4908323c64 in QAbstractButtonPrivate::emitClicked() () at /lib64/libQt5Widgets.so.5
#30 0x00007f4908325077 in QAbstractButtonPrivate::click() () at /lib64/libQt5Widgets.so.5
#31 0x00007f4908325264 in QAbstractButton::mouseReleaseEvent(QMouseEvent*) () at /lib64/libQt5Widgets.so.5
#32 0x00007f49082827c0 in QWidget::event(QEvent*) () at /lib64/libQt5Widgets.so.5
#33 0x00007f490823aecc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#34 0x00007f490824352d in QApplication::notify(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#35 0x00007f4906d706fa in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /lib64/libQt5Core.so.5
#36 0x00007f4908241bbd in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () at /lib64/libQt5Widgets.so.5
#37 0x00007f490829cf46 in QWidgetWindow::handleMouseEvent(QMouseEvent*) () at /lib64/libQt5Widgets.so.5
#38 0x00007f490829f9a3 in QWidgetWindow::event(QEvent*) () at /lib64/libQt5Widgets.so.5
#39 0x00007f490823aecc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#40 0x00007f4908242671 in QApplication::notify(QObject*, QEvent*) () at /lib64/libQt5Widgets.so.5
#41 0x00007f4906d706fa in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /lib64/libQt5Core.so.5
#42 0x00007f4907d312b3 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () at /lib64/libQt5Gui.so.5
#43 0x00007f4907d32d85 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () at /lib64/libQt5Gui.so.5
#44 0x00007f4907d13c4b in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Gui.so.5
#45 0x00007f48fb56d6c0 in userEventSourceDispatch(_GSource*, int (*)(void*), void*) () at /lib64/libQt5XcbQpa.so.5
#46 0x00007f48fee1fe52 in g_main_context_dispatch () at /lib64/libglib-2.0.so.0
#47 0x00007f48fee201d0 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#48 0x00007f48fee2027c in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#49 0x00007f4906dbe6cf in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#50 0x00007f4906d6f68a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt5Core.so.5
#51 0x00007f4906d7718c in QCoreApplication::exec() () at /lib64/libQt5Core.so.5
#52 0x000055733fc88414 in main ()

Reported using DrKonqi