Application: systemsettings5 (5.9.2)

Qt Version: 5.8.0
Frameworks Version: 5.31.0
Operating System: Linux 4.9.9-1-ARCH x86_64
Distribution: "Arch Linux"

-- Information about the crash:
- What I was doing when the application crashed:  Clicking "Configure" for QtCurve in the Widget Style section of System Settings.  Seems to be every time.  I haven't done any other troubleshooting yet.

The crash can be reproduced every time.

-- Backtrace:
Application: System Settings (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f64ac4825c0 (LWP 27669))]

Thread 11 (Thread 0x7f6476797700 (LWP 27699)):
#0  0x00007f64a2318e64 in g_mutex_unlock () at /usr/lib/libglib-2.0.so.0
#1  0x00007f64a22d364d in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f64a22d38bc in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f64a8acb06b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f64a8a7489a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f64a8896a73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f64a6b9b025 in  () at /usr/lib/libQt5Qml.so.5
#7  0x00007f64a889b6d8 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f64a41f4454 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f64a81b07df in clone () at /usr/lib/libc.so.6

Thread 10 (Thread 0x7f647d67c700 (LWP 27695)):
#0  0x00007f64a81a34ed in read () at /usr/lib/libc.so.6
#1  0x00007f64a2317aa0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f64a22d326e in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#3  0x00007f64a22d3744 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007f64a22d3b32 in g_main_loop_run () at /usr/lib/libglib-2.0.so.0
#5  0x00007f647e5e1446 in  () at /usr/lib/libgio-2.0.so.0
#6  0x00007f64a22fb175 in  () at /usr/lib/libglib-2.0.so.0
#7  0x00007f64a41f4454 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f64a81b07df in clone () at /usr/lib/libc.so.6

Thread 9 (Thread 0x7f647de7d700 (LWP 27694)):
#0  0x00007f64a81a748d in poll () at /usr/lib/libc.so.6
#1  0x00007f64a22d37a6 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f64a22d38bc in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f64a22d3901 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007f64a22fb175 in  () at /usr/lib/libglib-2.0.so.0
#5  0x00007f64a41f4454 in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f64a81b07df in clone () at /usr/lib/libc.so.6

Thread 8 (Thread 0x7f64838ce700 (LWP 27676)):
#0  0x00007f64a41fa10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f648dd02c5b in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f648dd02ab7 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f64a41f4454 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f64a81b07df in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7f64840cf700 (LWP 27675)):
#0  0x00007f64a41fa10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f648dd02c5b in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f648dd02ab7 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f64a41f4454 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f64a81b07df in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7f64848d0700 (LWP 27674)):
#0  0x00007f64a41fa10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f648dd02c5b in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f648dd02ab7 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f64a41f4454 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f64a81b07df in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f64850d1700 (LWP 27673)):
#0  0x00007f64a41fa10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f648dd02c5b in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f648dd02ab7 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f64a41f4454 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f64a81b07df in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f648cc43700 (LWP 27672)):
#0  0x00007f64a41fa10f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f648dd02c5b in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f648dd02ab7 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f64a41f4454 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f64a81b07df in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f648f98e700 (LWP 27671)):
#0  0x00007f64a8aca6b2 in  () at /usr/lib/libQt5Core.so.5
#1  0x00007f64a22d31a9 in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#2  0x00007f64a22d3744 in  () at /usr/lib/libglib-2.0.so.0
#3  0x00007f64a22d38bc in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#4  0x00007f64a8acb06b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f64a8a7489a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f64a8896a73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#7  0x00007f64a93e4125 in  () at /usr/lib/libQt5DBus.so.5
#8  0x00007f64a889b6d8 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f64a41f4454 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f64a81b07df in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f64988a4700 (LWP 27670)):
#0  0x00007f64a81a748d in poll () at /usr/lib/libc.so.6
#1  0x00007f64a4a778e0 in  () at /usr/lib/libxcb.so.1
#2  0x00007f64a4a79679 in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007f649ae08239 in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f64a889b6d8 in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f64a41f4454 in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f64a81b07df in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f64ac4825c0 (LWP 27669)):
[KCrash Handler]
#6  0x00007f64a9e78724 in QWindow::type() const () at /usr/lib/libQt5Gui.so.5
#7  0x00007f64a9e7dd92 in QWindow::winId() const () at /usr/lib/libQt5Gui.so.5
#8  0x00007f6493799262 in  () at /usr/lib/qt/plugins/platformthemes/KDEPlasmaPlatformTheme.so
#9  0x00007f649379993d in  () at /usr/lib/qt/plugins/platformthemes/KDEPlasmaPlatformTheme.so
#10 0x00007f64aa784d1c in  () at /usr/lib/libQt5Widgets.so.5
#11 0x00007f64aa7859f5 in QMenuBar::eventFilter(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#12 0x00007f64a8a761a1 in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#13 0x00007f64aa608325 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#14 0x00007f64aa60fb61 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#15 0x00007f64a8a76440 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#16 0x00007f64aa650e26 in QWidget::setParent(QWidget*, QFlags<Qt::WindowType>) () at /usr/lib/libQt5Widgets.so.5
#17 0x00007f64aa651bbc in QWidget::setParent(QWidget*) () at /usr/lib/libQt5Widgets.so.5
#18 0x00007f64aa62b926 in QLayout::addChildWidget(QWidget*) () at /usr/lib/libQt5Widgets.so.5
#19 0x00007f64aa62b99f in QLayout::addWidget(QWidget*) () at /usr/lib/libQt5Widgets.so.5
#20 0x00007f64aa76b71c in QMdiSubWindow::setWidget(QWidget*) () at /usr/lib/libQt5Widgets.so.5
#21 0x00007f64aa75f843 in QMdiArea::addSubWindow(QWidget*, QFlags<Qt::WindowType>) () at /usr/lib/libQt5Widgets.so.5
#22 0x00007f646995556d in  () at /usr/lib/qt/plugins/kstyle_qtcurve5_config.so
#23 0x00007f64699556a9 in  () at /usr/lib/qt/plugins/kstyle_qtcurve5_config.so
#24 0x00007f6469963d32 in  () at /usr/lib/qt/plugins/kstyle_qtcurve5_config.so
#25 0x00007f6469963e71 in allocate_kstyle_config () at /usr/lib/qt/plugins/kstyle_qtcurve5_config.so
#26 0x00007f6469bdfdaf in  () at /usr/lib/qt/plugins/kcm_style.so
#27 0x00007f64a8aa20be in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#28 0x00007f64aa6f0d02 in QAbstractButton::clicked(bool) () at /usr/lib/libQt5Widgets.so.5
#29 0x00007f64aa6f0f54 in  () at /usr/lib/libQt5Widgets.so.5
#30 0x00007f64aa6f2347 in  () at /usr/lib/libQt5Widgets.so.5
#31 0x00007f64aa6f2524 in QAbstractButton::mouseReleaseEvent(QMouseEvent*) () at /usr/lib/libQt5Widgets.so.5
#32 0x00007f64aa64fcd8 in QWidget::event(QEvent*) () at /usr/lib/libQt5Widgets.so.5
#33 0x00007f64aa60834c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#34 0x00007f64aa6108c5 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#35 0x00007f64a8a76440 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#36 0x00007f64aa60f0cd in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () at /usr/lib/libQt5Widgets.so.5
#37 0x00007f64aa66a3e6 in  () at /usr/lib/libQt5Widgets.so.5
#38 0x00007f64aa66ce03 in  () at /usr/lib/libQt5Widgets.so.5
#39 0x00007f64aa60834c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#40 0x00007f64aa60fb61 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#41 0x00007f64a8a76440 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#42 0x00007f64a9e73d53 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () at /usr/lib/libQt5Gui.so.5
#43 0x00007f64a9e758c5 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () at /usr/lib/libQt5Gui.so.5
#44 0x00007f64a9e5144b in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Gui.so.5
#45 0x00007f649ae689e0 in  () at /usr/lib/libQt5XcbQpa.so.5
#46 0x00007f64a22d35a7 in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#47 0x00007f64a22d3810 in  () at /usr/lib/libglib-2.0.so.0
#48 0x00007f64a22d38bc in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#49 0x00007f64a8acb04f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#50 0x00007f64a8a7489a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#51 0x00007f64a8a7cde4 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#52 0x000000000040c240 in  ()
#53 0x00007f64a80e8291 in __libc_start_main () at /usr/lib/libc.so.6
#54 0x000000000040c2ba in _start ()

Reported using DrKonqi