Application: plasmashell (5.8.5)

Qt Version: 5.7.1
Frameworks Version: 5.30.0
Operating System: Linux 4.8.13-1-ARCH x86_64
Distribution: "Arch Linux"

-- Information about the crash:
- What I was doing when the application crashed: 
I was running okular, firefox, chrome, dolphin, qtox, ktorrent, kdeconnect, kopete, amarok and others over 30 windows in 10 desktops. I press Ctrl+F10 to present windows then type to search for a particular window everything works fine. After selecting the window to view plasma crashes. 

Plasma also crashes if I switch desktops by clicking to select the desktop at the pager widget.

The crash can be reproduced sometimes.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f641c6c3800 (LWP 834))]

Thread 8 (Thread 0x7f63538b6700 (LWP 1297)):
#0  0x00007f6415dfb48d in poll () at /usr/lib/libc.so.6
#1  0x00007f6411092786 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f641109289c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f641671e48b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f64166c7e9a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f64164ea053 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f641a3f24b6 in  () at /usr/lib/libQt5Quick.so.5
#7  0x00007f64164eece8 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f64155fe454 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f6415e047df in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7f6367915700 (LWP 1201)):
#0  0x00007f64110d7dd4 in g_mutex_unlock () at /usr/lib/libglib-2.0.so.0
#1  0x00007f64110916de in g_main_context_acquire () at /usr/lib/libglib-2.0.so.0
#2  0x00007f6411092635 in  () at /usr/lib/libglib-2.0.so.0
#3  0x00007f641109289c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#4  0x00007f641671e48b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f64166c7e9a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f64164ea053 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#7  0x00007f63561880a7 in KCupsConnection::run() () at /usr/lib/libkcupslib.so
#8  0x00007f64164eece8 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f64155fe454 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f6415e047df in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7f63eebd8700 (LWP 977)):
#0  0x00007f641560410f in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f641be9e1f4 in  () at /usr/lib/libQt5Script.so.5
#2  0x00007f641be9e239 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007f64155fe454 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f6415e047df in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f63fcacf700 (LWP 969)):
#0  0x00007f6415e1102f in __libc_enable_asynccancel () at /usr/lib/libc.so.6
#1  0x00007f6415dfb482 in poll () at /usr/lib/libc.so.6
#2  0x00007f6411092786 in  () at /usr/lib/libglib-2.0.so.0
#3  0x00007f641109289c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#4  0x00007f641671e48b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f64166c7e9a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f64164ea053 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#7  0x00007f6419851e75 in  () at /usr/lib/libQt5Qml.so.5
#8  0x00007f64164eece8 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f64155fe454 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f6415e047df in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f63fe7c0700 (LWP 867)):
#0  0x00007f6415df74ed in read () at /usr/lib/libc.so.6
#1  0x00007f64110d6a10 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f6411092235 in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#3  0x00007f6411092724 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007f641109289c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5  0x00007f641671e48b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f64166c7e9a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007f64164ea053 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007f6419851e75 in  () at /usr/lib/libQt5Qml.so.5
#9  0x00007f64164eece8 in  () at /usr/lib/libQt5Core.so.5
#10 0x00007f64155fe454 in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007f6415e047df in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f63fffff700 (LWP 862)):
#0  0x00007f6415dfb48d in poll () at /usr/lib/libc.so.6
#1  0x00007f6411092786 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f641109289c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f641671e48b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f64166c7e9a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f64164ea053 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f6417265de5 in  () at /usr/lib/libQt5DBus.so.5
#7  0x00007f64164eece8 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f64155fe454 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f6415e047df in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f6405e7e700 (LWP 846)):
#0  0x00007f6415dfb48d in poll () at /usr/lib/libc.so.6
#1  0x00007f641adc48e0 in  () at /usr/lib/libxcb.so.1
#2  0x00007f641adc6679 in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007f6407bbb789 in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f64164eece8 in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f64155fe454 in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f6415e047df in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f641c6c3800 (LWP 834)):
[KCrash Handler]
#6  0x00007f6416690230 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f6416690519 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f6416698509 in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f64166f5239 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#10 0x00007f641676ce24 in QAbstractItemModel::rowsRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib/libQt5Core.so.5
#11 0x00007f641667163b in QAbstractItemModel::endRemoveRows() () at /usr/lib/libQt5Core.so.5
#12 0x00007f635fdc5375 in  () at /usr/lib/libtaskmanager.so.6
#13 0x00007f635fdc8549 in  () at /usr/lib/libtaskmanager.so.6
#14 0x00007f64166f5239 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#15 0x00007f641676cdb4 in QAbstractItemModel::rowsAboutToBeRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib/libQt5Core.so.5
#16 0x00007f6416670ee3 in QAbstractItemModel::beginRemoveRows(QModelIndex const&, int, int) () at /usr/lib/libQt5Core.so.5
#17 0x00007f6416695c55 in  () at /usr/lib/libQt5Core.so.5
#18 0x00007f64166970f4 in  () at /usr/lib/libQt5Core.so.5
#19 0x00007f6416697a91 in QSortFilterProxyModel::invalidateFilter() () at /usr/lib/libQt5Core.so.5
#20 0x00007f635fdbf2b5 in TaskManager::TaskFilterProxyModel::setVirtualDesktop(unsigned int) () at /usr/lib/libtaskmanager.so.6
#21 0x00007f635fdeaf51 in  () at /usr/lib/libtaskmanager.so.6
#22 0x00007f635fdebdeb in TaskManager::TasksModel::qt_metacall(QMetaObject::Call, int, void**) () at /usr/lib/libtaskmanager.so.6
#23 0x00007f64197b9600 in QQmlVMEMetaObject::metaCall(QObject*, QMetaObject::Call, int, void**) () at /usr/lib/libQt5Qml.so.5
#24 0x00007f641983ce54 in QQmlBinding::write(QQmlPropertyData const&, QV4::Value const&, bool, QFlags<QQmlPropertyPrivate::WriteFlag>) () at /usr/lib/libQt5Qml.so.5
#25 0x00007f641983e4d7 in QQmlBinding::update(QFlags<QQmlPropertyPrivate::WriteFlag>) () at /usr/lib/libQt5Qml.so.5
#26 0x00007f641983ef3e in QQmlBinding::refresh() () at /usr/lib/libQt5Qml.so.5
#27 0x00007f6419813ea4 in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) () at /usr/lib/libQt5Qml.so.5
#28 0x00007f64197bdd5c in QQmlData::signalEmitted(QAbstractDeclarativeData*, QObject*, int, void**) () at /usr/lib/libQt5Qml.so.5
#29 0x00007f64166f5954 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#30 0x00007f64166f55ae in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#31 0x00007f641937464e in KWindowSystem::currentDesktopChanged(int) () at /usr/lib/libKF5WindowSystem.so.5
#32 0x00007f63febe0757 in  () at /usr/lib/qt/plugins/kf5/org.kde.kwindowsystem.platforms/KF5WindowSystemX11Plugin.so
#33 0x00007f64166c6fdf in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () at /usr/lib/libQt5Core.so.5
#34 0x00007f6407bbcf54 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () at /usr/lib/libQt5XcbQpa.so.5
#35 0x00007f6407bbdc35 in QXcbConnection::processXcbEvents() () at /usr/lib/libQt5XcbQpa.so.5
#36 0x00007f64166f6099 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#37 0x00007f641762e35c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#38 0x00007f6417635ad1 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#39 0x00007f64166c9a40 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#40 0x00007f64166cc1cd in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#41 0x00007f641671e063 in  () at /usr/lib/libQt5Core.so.5
#42 0x00007f6411092587 in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#43 0x00007f64110927f0 in  () at /usr/lib/libglib-2.0.so.0
#44 0x00007f641109289c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#45 0x00007f641671e46f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#46 0x00007f64166c7e9a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#47 0x00007f64166d039c in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#48 0x000000000041c9d2 in  ()
#49 0x00007f6415d3c291 in __libc_start_main () at /usr/lib/libc.so.6
#50 0x000000000041cd5a in _start ()

Reported using DrKonqi