Application: plasmashell (5.9.3)

Qt Version: 5.8.0
Frameworks Version: 5.31.0
Operating System: Linux 4.9.11-1-ARCH x86_64
Distribution: "Arch Linux"

-- Information about the crash:
- What I was doing when the application crashed:
Clicking the vertical Default button in top left hand corner causes Plasma to crash

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f2e61dad800 (LWP 6176))]

Thread 8 (Thread 0x7f2d97051700 (LWP 6188)):
#0  0x00007f2e5b46a4ed in read () at /usr/lib/libc.so.6
#1  0x00007f2e562d0aa0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f2e5628c26e in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#3  0x00007f2e5628c744 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007f2e5628c8bc in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5  0x00007f2e5bd9206b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f2e5bd3b89a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007f2e5bb5da73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007f2d999230a7 in KCupsConnection::run() () at /usr/lib/libkcupslib.so
#9  0x00007f2e5bb626d8 in  () at /usr/lib/libQt5Core.so.5
#10 0x00007f2e5aa2d454 in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007f2e5b4777df in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7f2daccf5700 (LWP 6182)):
#0  0x00007f2e5628bdbe in g_main_context_prepare () at /usr/lib/libglib-2.0.so.0
#1  0x00007f2e5628c6cb in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f2e5628c8bc in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f2e5bd9206b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f2e5bd3b89a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f2e5bb5da73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f2e5f84afd6 in  () at /usr/lib/libQt5Quick.so.5
#7  0x00007f2e5bb626d8 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f2e5aa2d454 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f2e5b4777df in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7f2e377ba700 (LWP 6181)):
#0  0x00007f2e5aa3310f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f2e6153f234 in  () at /usr/lib/libQt5Script.so.5
#2  0x00007f2e6153f279 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007f2e5aa2d454 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f2e5b4777df in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f2e41533700 (LWP 6180)):
#0  0x00007f2e5b46a4ed in read () at /usr/lib/libc.so.6
#1  0x00007f2e562d0aa0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f2e5628c26e in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#3  0x00007f2e5628c744 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007f2e5628c8bc in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5  0x00007f2e5bd9206b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f2e5bd3b89a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007f2e5bb5da73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007f2e5ec97025 in  () at /usr/lib/libQt5Qml.so.5
#9  0x00007f2e5bb626d8 in  () at /usr/lib/libQt5Core.so.5
#10 0x00007f2e5aa2d454 in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007f2e5b4777df in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f2e437c8700 (LWP 6179)):
#0  0x00007f2e5b46e48d in poll () at /usr/lib/libc.so.6
#1  0x00007f2e5628c7a6 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f2e5628c8bc in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f2e5bd9206b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f2e5bd3b89a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f2e5bb5da73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f2e5ec97025 in  () at /usr/lib/libQt5Qml.so.5
#7  0x00007f2e5bb626d8 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f2e5aa2d454 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f2e5b4777df in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f2e493ef700 (LWP 6178)):
#0  0x00007f2e5b46e48d in poll () at /usr/lib/libc.so.6
#1  0x00007f2e5628c7a6 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f2e5628c8bc in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f2e5bd9206b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f2e5bd3b89a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f2e5bb5da73 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f2e5c1a7125 in  () at /usr/lib/libQt5DBus.so.5
#7  0x00007f2e5bb626d8 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f2e5aa2d454 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f2e5b4777df in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f2e4b049700 (LWP 6177)):
#0  0x00007f2e5b46e48d in poll () at /usr/lib/libc.so.6
#1  0x00007f2e604658e0 in  () at /usr/lib/libxcb.so.1
#2  0x00007f2e60467679 in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007f2e4cf88239 in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f2e5bb626d8 in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f2e5aa2d454 in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f2e5b4777df in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f2e61dad800 (LWP 6176)):
[KCrash Handler]
#6  0x00007f2e5f8f5de1 in QQuickItemPrivate::setEffectiveVisibleRecur(bool) () at /usr/lib/libQt5Quick.so.5
#7  0x00007f2e5f8f5dea in QQuickItemPrivate::setEffectiveVisibleRecur(bool) () at /usr/lib/libQt5Quick.so.5
#8  0x00007f2e5f8f5f44 in QQuickItem::setVisible(bool) () at /usr/lib/libQt5Quick.so.5
#9  0x00007f2e6187308c in  () at /usr/lib/libKF5PlasmaQuick.so.5
#10 0x00007f2e618748c6 in PlasmaQuick::Dialog::event(QEvent*) () at /usr/lib/libKF5PlasmaQuick.so.5
#11 0x00007f2e5ccab34c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#12 0x00007f2e5ccb2b61 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#13 0x00007f2e5bd3d440 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#14 0x00007f2e5c52078e in QWindow::setVisible(bool) () at /usr/lib/libQt5Gui.so.5
#15 0x00007f2e6187097c in PlasmaQuick::Dialog::setVisible(bool) () at /usr/lib/libKF5PlasmaQuick.so.5
#16 0x00007f2e61873818 in  () at /usr/lib/libKF5PlasmaQuick.so.5
#17 0x00007f2e6187507b in PlasmaQuick::Dialog::qt_metacall(QMetaObject::Call, int, void**) () at /usr/lib/libKF5PlasmaQuick.so.5
#18 0x00007f2e5ec0aac9 in  () at /usr/lib/libQt5Qml.so.5
#19 0x00007f2e5ec09498 in QQmlPropertyPrivate::write(QObject*, QQmlPropertyData const&, QVariant const&, QQmlContextData*, QFlags<QQmlPropertyData::WriteFlag>) () at /usr/lib/libQt5Qml.so.5
#20 0x00007f2e5ebd3b7b in QV4::QObjectWrapper::setProperty(QV4::ExecutionEngine*, QObject*, QQmlPropertyData*, QV4::Value const&) () at /usr/lib/libQt5Qml.so.5
#21 0x00007f2e5ebd4390 in QV4::QObjectWrapper::setQmlProperty(QV4::ExecutionEngine*, QQmlContextData*, QObject*, QV4::String*, QV4::QObjectWrapper::RevisionMode, QV4::Value const&) () at /usr/lib/libQt5Qml.so.5
#22 0x00007f2e5ebd44a6 in QV4::QObjectWrapper::put(QV4::Managed*, QV4::String*, QV4::Value const&) () at /usr/lib/libQt5Qml.so.5
#23 0x00007f2e5ebe4f56 in QV4::Runtime::method_setProperty(QV4::ExecutionEngine*, QV4::Value const&, int, QV4::Value const&) () at /usr/lib/libQt5Qml.so.5
#24 0x00007f2e36c55f42 in  ()
#25 0x0000000000a3f310 in  ()
#26 0x00007f2e36c56504 in  ()
#27 0x0000000000000000 in  ()

Reported using DrKonqi