Bug 399247

Application: systemsettings5 (5.12.6)

Qt Version: 5.9.6
Frameworks Version: 5.48.0
Operating System: Linux 4.18.9-100.fc27.x86_64 x86_64
Distribution: "Fedora release 27 (Twenty Seven)"

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

- open the system settings display
- open the advanced settings for an external monitor for a laptop
- change the refresh rate.
- hit apply.
(don't close window)
-change to a different type of external monitor.
- change the refresh rate.
-- notice tht the settings for the monitor haven't been updated to the new type of monitor
- settings crashed.

-- Backtrace:
Application: System Settings (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f2e49380500 (LWP 7906))]

Thread 6 (Thread 0x7f2e0ce48700 (LWP 7920)):
#0  0x00007f2e43037ddb in poll () from /lib64/libc.so.6
#1  0x00007f2e3b18aeb9 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#2  0x00007f2e3b18afcc in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007f2e43e8ed3b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007f2e43e3ca3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007f2e43c8da1a in QThread::exec() () from /lib64/libQt5Core.so.5
#6  0x00007f2e41a6e565 in QQmlThreadPrivate::run() () from /lib64/libQt5Qml.so.5
#7  0x00007f2e43c91f32 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#8  0x00007f2e3fcee50b in start_thread () from /lib64/libpthread.so.0
#9  0x00007f2e4304238f in clone () from /lib64/libc.so.6

Thread 5 (Thread 0x7f2e0f34f700 (LWP 7914)):
#0  0x00007f2e43e8d517 in QTimerInfoList::timerWait(timespec&) () from /lib64/libQt5Core.so.5
#1  0x00007f2e43e8ea1c in timerSourcePrepareHelper(GTimerSource*, int*) () from /lib64/libQt5Core.so.5
#2  0x00007f2e43e8eabe in timerSourcePrepare(_GSource*, int*) () from /lib64/libQt5Core.so.5
#3  0x00007f2e3b18a419 in g_main_context_prepare () from /lib64/libglib-2.0.so.0
#4  0x00007f2e3b18adeb in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#5  0x00007f2e3b18afcc in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#6  0x00007f2e43e8ed3b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#7  0x00007f2e43e3ca3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#8  0x00007f2e43c8da1a in QThread::exec() () from /lib64/libQt5Core.so.5
#9  0x00007f2e41a6e565 in QQmlThreadPrivate::run() () from /lib64/libQt5Qml.so.5
#10 0x00007f2e43c91f32 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#11 0x00007f2e3fcee50b in start_thread () from /lib64/libpthread.so.0
#12 0x00007f2e4304238f in clone () from /lib64/libc.so.6

Thread 4 (Thread 0x7f2e17043700 (LWP 7911)):
#0  0x00007f2e3b1d0499 in g_mutex_lock () from /lib64/libglib-2.0.so.0
#1  0x00007f2e3b18ae9f in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#2  0x00007f2e3b18afcc in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007f2e43e8ed3b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007f2e43e3ca3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007f2e43c8da1a in QThread::exec() () from /lib64/libQt5Core.so.5
#6  0x00007f2e41a6e565 in QQmlThreadPrivate::run() () from /lib64/libQt5Qml.so.5
#7  0x00007f2e43c91f32 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#8  0x00007f2e3fcee50b in start_thread () from /lib64/libpthread.so.0
#9  0x00007f2e4304238f in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x7f2e2567e700 (LWP 7909)):
#0  0x00007f2e430338b8 in read () from /lib64/libc.so.6
#1  0x00007f2e3b1cf160 in g_wakeup_acknowledge () from /lib64/libglib-2.0.so.0
#2  0x00007f2e3b18a9c8 in g_main_context_check () from /lib64/libglib-2.0.so.0
#3  0x00007f2e3b18ae60 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#4  0x00007f2e3b18afcc in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#5  0x00007f2e43e8ed3b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#6  0x00007f2e43e3ca3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#7  0x00007f2e43c8da1a in QThread::exec() () from /lib64/libQt5Core.so.5
#8  0x00007f2e45695449 in QDBusConnectionManager::run() () from /lib64/libQt5DBus.so.5
#9  0x00007f2e43c91f32 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#10 0x00007f2e3fcee50b in start_thread () from /lib64/libpthread.so.0
#11 0x00007f2e4304238f in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7f2e2ee41700 (LWP 7908)):
#0  0x00007f2e43037ddb in poll () from /lib64/libc.so.6
#1  0x00007f2e3eb5efe7 in _xcb_conn_wait () from /lib64/libxcb.so.1
#2  0x00007f2e3eb60dda in xcb_wait_for_event () from /lib64/libxcb.so.1
#3  0x00007f2e319dfcd9 in QXcbEventReader::run() () from /lib64/libQt5XcbQpa.so.5
#4  0x00007f2e43c91f32 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#5  0x00007f2e3fcee50b in start_thread () from /lib64/libpthread.so.0
#6  0x00007f2e4304238f in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7f2e49380500 (LWP 7906)):
[KCrash Handler]
#6  0x00007f2e0ce83b90 in KScreen::Mode::id() const () from /lib64/libKF5Screen.so.7
#7  0x00007f2e0d0b3bc8 in OutputConfig::slotResolutionChanged(QSize const&) [clone .part.24] () from /usr/lib64/qt5/plugins/kcm_kscreen.so
#8  0x00007f2e43e66727 in QMetaObject::activate(QObject*, int, int, void**) () from /lib64/libQt5Core.so.5
#9  0x00007f2e0d0ca492 in ResolutionSlider::resolutionChanged(QSize const&) () from /usr/lib64/qt5/plugins/kcm_kscreen.so
#10 0x00007f2e0d0bc2db in ResolutionSlider::slotValueChanged(int) () from /usr/lib64/qt5/plugins/kcm_kscreen.so
#11 0x00007f2e43e66727 in QMetaObject::activate(QObject*, int, int, void**) () from /lib64/libQt5Core.so.5
#12 0x00007f2e44e32f4e in QAbstractSlider::valueChanged(int) () from /lib64/libQt5Widgets.so.5
#13 0x00007f2e44e3360b in QAbstractSlider::setValue(int) () from /lib64/libQt5Widgets.so.5
#14 0x00007f2e44ed987b in QSlider::mouseMoveEvent(QMouseEvent*) () from /lib64/libQt5Widgets.so.5
#15 0x00007f2e44d7d298 in QWidget::event(QEvent*) () from /lib64/libQt5Widgets.so.5
#16 0x00007f2e44ed9eaa in QSlider::event(QEvent*) () from /lib64/libQt5Widgets.so.5
#17 0x00007f2e44d3e92c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#18 0x00007f2e44d466cf in QApplication::notify(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#19 0x00007f2e43e3dcd7 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /lib64/libQt5Core.so.5
#20 0x00007f2e44d456a2 in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () from /lib64/libQt5Widgets.so.5
#21 0x00007f2e44d9846b in QWidgetWindow::handleMouseEvent(QMouseEvent*) () from /lib64/libQt5Widgets.so.5
#22 0x00007f2e44d9ab0f in QWidgetWindow::event(QEvent*) () from /lib64/libQt5Widgets.so.5
#23 0x00007f2e44d3e92c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#24 0x00007f2e44d46174 in QApplication::notify(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#25 0x00007f2e43e3dcd7 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /lib64/libQt5Core.so.5
#26 0x00007f2e44624973 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () from /lib64/libQt5Gui.so.5
#27 0x00007f2e44626585 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /lib64/libQt5Gui.so.5
#28 0x00007f2e445ff7fb in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Gui.so.5
#29 0x00007f2e31a42c40 in userEventSourceDispatch(_GSource*, int (*)(void*), void*) () from /lib64/libQt5XcbQpa.so.5
#30 0x00007f2e3b18ab97 in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#31 0x00007f2e3b18af40 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#32 0x00007f2e3b18afcc in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#33 0x00007f2e43e8ed1f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#34 0x00007f2e43e3ca3a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#35 0x00007f2e43e45194 in QCoreApplication::exec() () from /lib64/libQt5Core.so.5
#36 0x0000559fc1d34f14 in main ()

Reported using DrKonqi