Application: plasmashell (5.10.1)
 (Compiled from sources)
Qt Version: 5.9.0
Frameworks Version: 5.35.0
Operating System: Linux 4.11.3-1-ARCH x86_64
Distribution (Platform): Archlinux Packages

-- Information about the crash:
I closed a few IntelliJ IDEA windows and then Plasma crashed.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f85bb1cad80 (LWP 843))]

Thread 9 (Thread 0x7f84e838f700 (LWP 13633)):
#0  0x00007f85af418a29 in g_mutex_lock () at /usr/lib/libglib-2.0.so.0
#1  0x00007f85af3d2a80 in g_main_context_acquire () at /usr/lib/libglib-2.0.so.0
#2  0x00007f85af3d3ab5 in  () at /usr/lib/libglib-2.0.so.0
#3  0x00007f85af3d3d0c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#4  0x00007f85b5140e9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f85b50e721a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f85b4f0940a in QThread::exec() () at /usr/lib/libQt5Core.so.5
#7  0x00007f85b8078645 in  () at /usr/lib/libQt5Qml.so.5
#8  0x00007f85b4f0dcbd in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f85b40d6297 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f85b482225f in clone () at /usr/lib/libc.so.6

Thread 8 (Thread 0x7f84fa6a6700 (LWP 1029)):
#0  0x00007f85af3d3361 in g_main_context_query () at /usr/lib/libglib-2.0.so.0
#1  0x00007f85af3d3b77 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f85af3d3d0c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f85b5140e9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f85b50e721a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f85b4f0940a in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f84fd04a0a7 in KCupsConnection::run() () at /usr/lib/libkcupslib.so
#7  0x00007f85b4f0dcbd in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f85b40d6297 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f85b482225f in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7f85055d2700 (LWP 987)):
#0  0x00007f85b513ede7 in QTimerInfoList::repairTimersIfNeeded() () at /usr/lib/libQt5Core.so.5
#1  0x00007f85b513ee63 in QTimerInfoList::timerWait(timespec&) () at /usr/lib/libQt5Core.so.5
#2  0x00007f85b514047e in  () at /usr/lib/libQt5Core.so.5
#3  0x00007f85af3d3138 in g_main_context_prepare () at /usr/lib/libglib-2.0.so.0
#4  0x00007f85af3d3b2b in  () at /usr/lib/libglib-2.0.so.0
#5  0x00007f85af3d3d0c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#6  0x00007f85b5140e9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007f85b50e721a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#8  0x00007f85b4f0940a in QThread::exec() () at /usr/lib/libQt5Core.so.5
#9  0x00007f85b8c30836 in  () at /usr/lib/libQt5Quick.so.5
#10 0x00007f85b4f0dcbd in  () at /usr/lib/libQt5Core.so.5
#11 0x00007f85b40d6297 in start_thread () at /usr/lib/libpthread.so.0
#12 0x00007f85b482225f in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7f8594b78700 (LWP 951)):
#0  0x00007f85b40dc39d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f85ba94bac4 in  () at /usr/lib/libQt5Script.so.5
#2  0x00007f85ba94bb09 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007f85b40d6297 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f85b482225f in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f8596f72700 (LWP 929)):
#0  0x00007f85b48182bd in poll () at /usr/lib/libc.so.6
#1  0x00007f85af3d3bf9 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f85af3d3d0c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f85b5140e9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f85b50e721a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f85b4f0940a in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f85b8078645 in  () at /usr/lib/libQt5Qml.so.5
#7  0x00007f85b4f0dcbd in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f85b40d6297 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f85b482225f in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f859d54e700 (LWP 895)):
#0  0x00007f85b48182bd in poll () at /usr/lib/libc.so.6
#1  0x00007f85af3d3bf9 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f85af3d3d0c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f85b5140e9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f85b50e721a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f85b4f0940a in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f85b8078645 in  () at /usr/lib/libQt5Qml.so.5
#7  0x00007f85b4f0dcbd in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f85b40d6297 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f85b482225f in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f859ef98700 (LWP 862)):
#0  0x00007f85b48182bd in poll () at /usr/lib/libc.so.6
#1  0x00007f85af3d3bf9 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f85af3d3d0c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f85b5140e9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f85b50e721a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f85b4f0940a in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f85b5cd4d45 in  () at /usr/lib/libQt5DBus.so.5
#7  0x00007f85b4f0dcbd in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f85b40d6297 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f85b482225f in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f85a5154700 (LWP 853)):
#0  0x00007f85b48182bd in poll () at /usr/lib/libc.so.6
#1  0x00007f85b98598e0 in  () at /usr/lib/libxcb.so.1
#2  0x00007f85b985b679 in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007f85a76c5d49 in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f85b4f0dcbd in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f85b40d6297 in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f85b482225f in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f85bb1cad80 (LWP 843)):
[KCrash Handler]
#5  0x00007f85b50ac129 in  () at /usr/lib/libQt5Core.so.5
#6  0x00007f85b50ac48c in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f85b50b2e09 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f85b5117465 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#9  0x00007f85b5190fce in QAbstractItemModel::rowsRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib/libQt5Core.so.5
#10 0x00007f85b508b52b in QAbstractItemModel::endRemoveRows() () at /usr/lib/libQt5Core.so.5
#11 0x00007f84e9c1ccaf in TaskManager::TaskGroupingProxyModel::Private::sourceRowsAboutToBeRemoved(QModelIndex const&, int, int) () at /usr/lib/libtaskmanager.so.6
#12 0x00007f84e9c1f019 in  () at /usr/lib/libtaskmanager.so.6
#13 0x00007f85b5117465 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#14 0x00007f85b5190f4e in QAbstractItemModel::rowsAboutToBeRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib/libQt5Core.so.5
#15 0x00007f85b508ae0b in QAbstractItemModel::beginRemoveRows(QModelIndex const&, int, int) () at /usr/lib/libQt5Core.so.5
#16 0x00007f85b50b0635 in  () at /usr/lib/libQt5Core.so.5
#17 0x00007f85b50b07d3 in  () at /usr/lib/libQt5Core.so.5
#18 0x00007f85b50b2de8 in  () at /usr/lib/libQt5Core.so.5
#19 0x00007f85b5117465 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#20 0x00007f85b5190f4e in QAbstractItemModel::rowsAboutToBeRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib/libQt5Core.so.5
#21 0x00007f85b508ae0b in QAbstractItemModel::beginRemoveRows(QModelIndex const&, int, int) () at /usr/lib/libQt5Core.so.5
#22 0x00007f84eb3a157b in  () at /usr/lib/libKF5ItemModels.so.5
#23 0x00007f85b5117465 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#24 0x00007f85b5190f4e in QAbstractItemModel::rowsAboutToBeRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib/libQt5Core.so.5
#25 0x00007f85b508ae0b in QAbstractItemModel::beginRemoveRows(QModelIndex const&, int, int) () at /usr/lib/libQt5Core.so.5
#26 0x00007f85b50a7811 in  () at /usr/lib/libQt5Core.so.5
#27 0x00007f85b5117465 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#28 0x00007f85b5190f4e in QAbstractItemModel::rowsAboutToBeRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib/libQt5Core.so.5
#29 0x00007f85b508ae0b in QAbstractItemModel::beginRemoveRows(QModelIndex const&, int, int) () at /usr/lib/libQt5Core.so.5
#30 0x00007f84e9c3827a in TaskManager::XWindowTasksModel::Private::removeWindow(unsigned long long) () at /usr/lib/libtaskmanager.so.6
#31 0x00007f85b511757f in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#32 0x00007f85b7b90a92 in KWindowSystem::windowRemoved(unsigned long long) () at /usr/lib/libKF5WindowSystem.so.5
#33 0x00007f859d970429 in  () at /usr/lib/qt/plugins/kf5/org.kde.kwindowsystem.platforms/KF5WindowSystemX11Plugin.so
#34 0x00007f85b7b89498 in NETRootInfo::update(QFlags<NET::Property>, QFlags<NET::Property2>) () at /usr/lib/libKF5WindowSystem.so.5
#35 0x00007f85b7b8a802 in NETRootInfo::event(xcb_generic_event_t*, QFlags<NET::Property>*, QFlags<NET::Property2>*) () at /usr/lib/libKF5WindowSystem.so.5
#36 0x00007f85b7b8ab65 in NETRootInfo::event(xcb_generic_event_t*, unsigned long*, int) () at /usr/lib/libKF5WindowSystem.so.5
#37 0x00007f859d96f95d in  () at /usr/lib/qt/plugins/kf5/org.kde.kwindowsystem.platforms/KF5WindowSystemX11Plugin.so
#38 0x00007f85b50e5d7f in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () at /usr/lib/libQt5Core.so.5
#39 0x00007f85a76c72c0 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () at /usr/lib/libQt5XcbQpa.so.5
#40 0x00007f85a76c7f4c in QXcbConnection::processXcbEvents() () at /usr/lib/libQt5XcbQpa.so.5
#41 0x00007f85b5117e72 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#42 0x00007f85b609e46c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#43 0x00007f85b60a5cf4 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#44 0x00007f85b50e8b98 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#45 0x00007f85b50eb02d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#46 0x00007f85b5140a63 in  () at /usr/lib/libQt5Core.so.5
#47 0x00007f85af3d3a47 in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#48 0x00007f85af3d3c78 in  () at /usr/lib/libglib-2.0.so.0
#49 0x00007f85af3d3d0c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#50 0x00007f85b5140e7f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#51 0x00007f85b50e721a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#52 0x00007f85b50efa74 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#53 0x000000000041cce2 in  ()
#54 0x00007f85b475543a in __libc_start_main () at /usr/lib/libc.so.6
#55 0x000000000041d05a in _start ()

Reported using DrKonqi