Bug 373875

Summary: Plasma crash when i close group of the windows or exact window by right-click on taskbar
Product: [Plasma] plasmashell Reporter: Sergey Mikhailov <mikhailov.s>
Component: generalAssignee: David Edmundson <kde>
Status: RESOLVED DUPLICATE    
Severity: crash CC: bhush94, plasma-bugs, tkedwards
Priority: NOR Keywords: drkonqi
Version: 5.8.4   
Target Milestone: 1.0   
Platform: Fedora RPMs   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description Sergey Mikhailov 2016-12-19 03:02:05 UTC 
Application: plasmashell (5.8.4)

Qt Version: 5.6.2
Frameworks Version: 5.27.0
Operating System: Linux 4.8.13-200.fc24.x86_64 x86_64
Distribution: "Fedora release 24 (Twenty Four)"

-- Information about the crash:
I have some windows opened, they are grouped into one button on the taskbar. usually it is (Dolphin or Ark)
Every time when i try to close this windows by right-clicking a taskbar button and choose "Close" plasma will almost always crash and re-start  taskbar and widget panel 
plasma also sometimes crash in the same manner when taskbar button is not a group, but exact single window/application. But this a rare case

The crash can be reproduced sometimes.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fcf46d87940 (LWP 1471))]

Thread 15 (Thread 0x7f8e573ed700 (LWP 30729)):
#0  0x00007fcf557c4f62 in __libc_enable_asynccancel () from /lib64/libc.so.6
#1  0x00007fcf557a71c2 in read () from /lib64/libc.so.6
#2  0x00007fcf487b9b31 in pa_read () from /usr/lib64/pulseaudio/libpulsecommon-8.0.so
#3  0x00007fcf49050d7e in pa_mainloop_prepare () from /lib64/libpulse.so.0
#4  0x00007fcf490517f0 in pa_mainloop_iterate () from /lib64/libpulse.so.0
#5  0x00007fcf490518b0 in pa_mainloop_run () from /lib64/libpulse.so.0
#6  0x00007fcf4905f8c9 in thread () from /lib64/libpulse.so.0
#7  0x00007fcf487e718b in internal_thread_func () from /usr/lib64/pulseaudio/libpulsecommon-8.0.so
#8  0x00007fcf54b075ca in start_thread () from /lib64/libpthread.so.0
#9  0x00007fcf557b70ed in clone () from /lib64/libc.so.6

Thread 14 (Thread 0x7fce77fff700 (LWP 18534)):
#0  0x00007fcf4905115a in pa_mainloop_poll () from /lib64/libpulse.so.0
#1  0x00007fcf490517fe in pa_mainloop_iterate () from /lib64/libpulse.so.0
#2  0x00007fcf490518b0 in pa_mainloop_run () from /lib64/libpulse.so.0
#3  0x00007fcf4905f8c9 in thread () from /lib64/libpulse.so.0
#4  0x00007fcf487e718b in internal_thread_func () from /usr/lib64/pulseaudio/libpulsecommon-8.0.so
#5  0x00007fcf54b075ca in start_thread () from /lib64/libpthread.so.0
#6  0x00007fcf557b70ed in clone () from /lib64/libc.so.6

Thread 13 (Thread 0x7fce6df37700 (LWP 2992)):
#0  0x00007fcf54b0cbd0 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fcf563c403a in QWaitCondition::wait(QMutex*, unsigned long) () from /lib64/libQt5Core.so.5
#2  0x00007fce965638c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () from /lib64/libKF5ThreadWeaver.so.5
#3  0x00007fce96567a78 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#4  0x00007fce96562a3d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#5  0x00007fce96567ad2 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#6  0x00007fce96562a3d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#7  0x00007fce96565909 in ThreadWeaver::Thread::run() () from /lib64/libKF5ThreadWeaver.so.5
#8  0x00007fcf563c39ba in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#9  0x00007fcf54b075ca in start_thread () from /lib64/libpthread.so.0
#10 0x00007fcf557b70ed in clone () from /lib64/libc.so.6

Thread 12 (Thread 0x7fce6e738700 (LWP 2991)):
#0  0x00007fcf54b0cbd0 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fcf563c403a in QWaitCondition::wait(QMutex*, unsigned long) () from /lib64/libQt5Core.so.5
#2  0x00007fce965638c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () from /lib64/libKF5ThreadWeaver.so.5
#3  0x00007fce96567a78 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#4  0x00007fce96562a3d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#5  0x00007fce96567ad2 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#6  0x00007fce96562a3d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#7  0x00007fce96567ad2 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#8  0x00007fce96562a3d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#9  0x00007fce96565909 in ThreadWeaver::Thread::run() () from /lib64/libKF5ThreadWeaver.so.5
#10 0x00007fcf563c39ba in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#11 0x00007fcf54b075ca in start_thread () from /lib64/libpthread.so.0
#12 0x00007fcf557b70ed in clone () from /lib64/libc.so.6

Thread 11 (Thread 0x7fce6ef39700 (LWP 2990)):
#0  0x00007fcf54b0cbd0 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fcf563c403a in QWaitCondition::wait(QMutex*, unsigned long) () from /lib64/libQt5Core.so.5
#2  0x00007fce965638c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () from /lib64/libKF5ThreadWeaver.so.5
#3  0x00007fce96567a78 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#4  0x00007fce96562a3d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#5  0x00007fce96567ad2 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#6  0x00007fce96562a3d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#7  0x00007fce96565909 in ThreadWeaver::Thread::run() () from /lib64/libKF5ThreadWeaver.so.5
#8  0x00007fcf563c39ba in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#9  0x00007fcf54b075ca in start_thread () from /lib64/libpthread.so.0
#10 0x00007fcf557b70ed in clone () from /lib64/libc.so.6

Thread 10 (Thread 0x7fce7df90700 (LWP 2989)):
#0  0x00007fcf54b0cbd0 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fcf563c403a in QWaitCondition::wait(QMutex*, unsigned long) () from /lib64/libQt5Core.so.5
#2  0x00007fce965638c0 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () from /lib64/libKF5ThreadWeaver.so.5
#3  0x00007fce96567a78 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#4  0x00007fce96562a3d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#5  0x00007fce96567ad2 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#6  0x00007fce96562a3d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#7  0x00007fce96565909 in ThreadWeaver::Thread::run() () from /lib64/libKF5ThreadWeaver.so.5
#8  0x00007fcf563c39ba in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#9  0x00007fcf54b075ca in start_thread () from /lib64/libpthread.so.0
#10 0x00007fcf557b70ed in clone () from /lib64/libc.so.6

Thread 9 (Thread 0x7fce8ba2e700 (LWP 1798)):
#0  0x00007fcf557ab56d in poll () from /lib64/libc.so.6
#1  0x00007fcf50eeba06 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#2  0x00007fcf50eebb1c in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007fcf565b175b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007fcf5656081a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007fcf563bf353 in QThread::exec() () from /lib64/libQt5Core.so.5
#6  0x00007fce8d1cd2e7 in KCupsConnection::run() () from /lib64/libkcupslib.so
#7  0x00007fcf563c39ba in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#8  0x00007fcf54b075ca in start_thread () from /lib64/libpthread.so.0
#9  0x00007fcf557b70ed in clone () from /lib64/libc.so.6

Thread 8 (Thread 0x7fce9d6a6700 (LWP 1679)):
#0  0x00007fcf50eeb919 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#1  0x00007fcf50eebb1c in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#2  0x00007fcf565b175b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#3  0x00007fcf5656081a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007fcf563bf353 in QThread::exec() () from /lib64/libQt5Core.so.5
#5  0x00007fcf5a020d56 in QQuickPixmapReader::run() () from /lib64/libQt5Quick.so.5
#6  0x00007fcf563c39ba in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#7  0x00007fcf54b075ca in start_thread () from /lib64/libpthread.so.0
#8  0x00007fcf557b70ed in clone () from /lib64/libc.so.6

Thread 7 (Thread 0x7fcea23f8700 (LWP 1647)):
#0  0x00007fcf54b0cbd0 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fcea5c326b3 in radeon_drm_cs_emit_ioctl () from /usr/lib64/dri/r600_dri.so
#2  0x00007fcea5c31df7 in impl_thrd_routine () from /usr/lib64/dri/r600_dri.so
#3  0x00007fcf54b075ca in start_thread () from /lib64/libpthread.so.0
#4  0x00007fcf557b70ed in clone () from /lib64/libc.so.6

Thread 6 (Thread 0x7fcf26fbf700 (LWP 1646)):
#0  0x00007fcf54b0cbd0 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fcf5beb71a4 in QTWTF::TCMalloc_PageHeap::scavengerThread() () from /lib64/libQt5Script.so.5
#2  0x00007fcf5beb71e9 in QTWTF::TCMalloc_PageHeap::runScavengerThread(void*) () from /lib64/libQt5Script.so.5
#3  0x00007fcf54b075ca in start_thread () from /lib64/libpthread.so.0
#4  0x00007fcf557b70ed in clone () from /lib64/libc.so.6

Thread 5 (Thread 0x7fcf34c0d700 (LWP 1598)):
#0  0x00007fcf50eeb419 in g_main_context_check () from /lib64/libglib-2.0.so.0
#1  0x00007fcf50eeb9a4 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#2  0x00007fcf50eebb1c in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007fcf565b175b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007fcf5656081a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007fcf563bf353 in QThread::exec() () from /lib64/libQt5Core.so.5
#6  0x00007fcf59698525 in QQmlThreadPrivate::run() () from /lib64/libQt5Qml.so.5
#7  0x00007fcf563c39ba in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#8  0x00007fcf54b075ca in start_thread () from /lib64/libpthread.so.0
#9  0x00007fcf557b70ed in clone () from /lib64/libc.so.6

Thread 4 (Thread 0x7fcf365b9700 (LWP 1578)):
#0  0x00007fcf557ab56d in poll () from /lib64/libc.so.6
#1  0x00007fcf50eeba06 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#2  0x00007fcf50eebb1c in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007fcf565b175b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007fcf5656081a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007fcf563bf353 in QThread::exec() () from /lib64/libQt5Core.so.5
#6  0x00007fcf59698525 in QQmlThreadPrivate::run() () from /lib64/libQt5Qml.so.5
#7  0x00007fcf563c39ba in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#8  0x00007fcf54b075ca in start_thread () from /lib64/libpthread.so.0
#9  0x00007fcf557b70ed in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x7fcf37fff700 (LWP 1532)):
#0  0x00007fcf557ab56d in poll () from /lib64/libc.so.6
#1  0x00007fcf50eeba06 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#2  0x00007fcf50eebb1c in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007fcf565b175b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007fcf5656081a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007fcf563bf353 in QThread::exec() () from /lib64/libQt5Core.so.5
#6  0x00007fcf56ca8559 in QDBusConnectionManager::run() () from /lib64/libQt5DBus.so.5
#7  0x00007fcf563c39ba in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#8  0x00007fcf54b075ca in start_thread () from /lib64/libpthread.so.0
#9  0x00007fcf557b70ed in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7fcf3d7ea700 (LWP 1515)):
#0  0x00007fcf557ab56d in poll () from /lib64/libc.so.6
#1  0x00007fcf5a7ddf80 in _xcb_conn_wait () from /lib64/libxcb.so.1
#2  0x00007fcf5a7dfb79 in xcb_wait_for_event () from /lib64/libxcb.so.1
#3  0x00007fcf40327f99 in QXcbEventReader::run() () from /lib64/libQt5XcbQpa.so.5
#4  0x00007fcf563c39ba in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#5  0x00007fcf54b075ca in start_thread () from /lib64/libpthread.so.0
#6  0x00007fcf557b70ed in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7fcf46d87940 (LWP 1471)):
[KCrash Handler]
#6  0x00007fcf5653263c in QSortFilterProxyModelPrivate::updateChildrenMapping(QModelIndex const&, QSortFilterProxyModelPrivate::Mapping*, Qt::Orientation, int, int, int, bool) () from /lib64/libQt5Core.so.5
#7  0x00007fcf56532982 in QSortFilterProxyModelPrivate::source_items_removed(QModelIndex const&, int, int, Qt::Orientation) [clone .part.85] () from /lib64/libQt5Core.so.5
#8  0x00007fcf565384b9 in QSortFilterProxyModel::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) () from /lib64/libQt5Core.so.5
#9  0x00007fcf56589dd2 in QMetaObject::activate(QObject*, int, int, void**) () from /lib64/libQt5Core.so.5
#10 0x00007fcf565fa0b4 in QAbstractItemModel::rowsRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () from /lib64/libQt5Core.so.5
#11 0x00007fcf565173b5 in QAbstractItemModel::endRemoveRows() () from /lib64/libQt5Core.so.5
#12 0x00007fce95ed4dd8 in TaskManager::TaskGroupingProxyModel::Private::sourceRowsAboutToBeRemoved(QModelIndex const&, int, int) [clone .part.68] () from /lib64/libtaskmanager.so.6
#13 0x00007fce95ed7eb9 in TaskManager::TaskGroupingProxyModel::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) () from /lib64/libtaskmanager.so.6
#14 0x00007fcf56589dd2 in QMetaObject::activate(QObject*, int, int, void**) () from /lib64/libQt5Core.so.5
#15 0x00007fcf565fa044 in QAbstractItemModel::rowsAboutToBeRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () from /lib64/libQt5Core.so.5
#16 0x00007fcf565168c3 in QAbstractItemModel::beginRemoveRows(QModelIndex const&, int, int) () from /lib64/libQt5Core.so.5
#17 0x00007fcf565310b5 in QSortFilterProxyModelPrivate::remove_proxy_interval(QVector<int>&, QVector<int>&, int, int, QModelIndex const&, Qt::Orientation, bool) () from /lib64/libQt5Core.so.5
#18 0x00007fcf56535ea7 in QSortFilterProxyModelPrivate::remove_source_items(QVector<int>&, QVector<int>&, QVector<int> const&, QModelIndex const&, Qt::Orientation, bool) () from /lib64/libQt5Core.so.5
#19 0x00007fcf565360b4 in QSortFilterProxyModelPrivate::source_items_about_to_be_removed(QModelIndex const&, int, int, Qt::Orientation) () from /lib64/libQt5Core.so.5
#20 0x00007fcf56538498 in QSortFilterProxyModel::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) () from /lib64/libQt5Core.so.5
#21 0x00007fcf56589dd2 in QMetaObject::activate(QObject*, int, int, void**) () from /lib64/libQt5Core.so.5
#22 0x00007fcf565fa044 in QAbstractItemModel::rowsAboutToBeRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () from /lib64/libQt5Core.so.5
#23 0x00007fcf565168c3 in QAbstractItemModel::beginRemoveRows(QModelIndex const&, int, int) () from /lib64/libQt5Core.so.5
#24 0x00007fce97252c75 in KConcatenateRowsProxyModelPrivate::slotRowsAboutToBeRemoved(QModelIndex const&, int, int) () from /lib64/libKF5ItemModels.so.5
#25 0x00007fce97254131 in KConcatenateRowsProxyModel::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) () from /lib64/libKF5ItemModels.so.5
#26 0x00007fcf56589dd2 in QMetaObject::activate(QObject*, int, int, void**) () from /lib64/libQt5Core.so.5
#27 0x00007fcf565fa044 in QAbstractItemModel::rowsAboutToBeRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () from /lib64/libQt5Core.so.5
#28 0x00007fcf565168c3 in QAbstractItemModel::beginRemoveRows(QModelIndex const&, int, int) () from /lib64/libQt5Core.so.5
#29 0x00007fcf5652cc37 in QIdentityProxyModelPrivate::_q_sourceRowsAboutToBeRemoved(QModelIndex const&, int, int) () from /lib64/libQt5Core.so.5
#30 0x00007fcf5652d839 in QIdentityProxyModel::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) () from /lib64/libQt5Core.so.5
#31 0x00007fcf56589dd2 in QMetaObject::activate(QObject*, int, int, void**) () from /lib64/libQt5Core.so.5
#32 0x00007fcf565fa044 in QAbstractItemModel::rowsAboutToBeRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () from /lib64/libQt5Core.so.5
#33 0x00007fcf565168c3 in QAbstractItemModel::beginRemoveRows(QModelIndex const&, int, int) () from /lib64/libQt5Core.so.5
#34 0x00007fce95eeec53 in TaskManager::XWindowTasksModel::Private::removeWindow(unsigned long long) () from /lib64/libtaskmanager.so.6
#35 0x00007fcf5658a0fc in QMetaObject::activate(QObject*, int, int, void**) () from /lib64/libQt5Core.so.5
#36 0x00007fcf58e3bf12 in KWindowSystem::windowRemoved(unsigned long long) () from /lib64/libKF5WindowSystem.so.5
#37 0x00007fcf369d9336 in NETEventFilter::removeClient(unsigned int) () from /usr/lib64/qt5/plugins/kf5/org.kde.kwindowsystem.platforms/KF5WindowSystemX11Plugin.so
#38 0x00007fcf58e343f2 in NETRootInfo::update(QFlags<NET::Property>, QFlags<NET::Property2>) () from /lib64/libKF5WindowSystem.so.5
#39 0x00007fcf58e3541c in NETRootInfo::event(xcb_generic_event_t*, QFlags<NET::Property>*, QFlags<NET::Property2>*) () from /lib64/libKF5WindowSystem.so.5
#40 0x00007fcf58e35742 in NETRootInfo::event(xcb_generic_event_t*, unsigned long*, int) () from /lib64/libKF5WindowSystem.so.5
#41 0x00007fcf369d8a66 in NETEventFilter::nativeEventFilter(xcb_generic_event_t*) () from /usr/lib64/qt5/plugins/kf5/org.kde.kwindowsystem.platforms/KF5WindowSystemX11Plugin.so
#42 0x00007fcf5655f8cc in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () from /lib64/libQt5Core.so.5
#43 0x00007fcf40329965 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () from /lib64/libQt5XcbQpa.so.5
#44 0x00007fcf4032a94b in QXcbConnection::processXcbEvents() () from /lib64/libQt5XcbQpa.so.5
#45 0x00007fcf5658ae19 in QObject::event(QEvent*) () from /lib64/libQt5Core.so.5
#46 0x00007fcf56e79e4c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#47 0x00007fcf56e7f32f in QApplication::notify(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#48 0x00007fcf565619da in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /lib64/libQt5Core.so.5
#49 0x00007fcf56563a8f in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /lib64/libQt5Core.so.5
#50 0x00007fcf565b16c3 in postEventSourceDispatch(_GSource*, int (*)(void*), void*) () from /lib64/libQt5Core.so.5
#51 0x00007fcf50eeb6ba in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#52 0x00007fcf50eeba70 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#53 0x00007fcf50eebb1c in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#54 0x00007fcf565b173f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#55 0x00007fcf5656081a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#56 0x00007fcf565683bc in QCoreApplication::exec() () from /lib64/libQt5Core.so.5
#57 0x000055e5c6094464 in main ()

Possible duplicates by query: bug 373600, bug 373265, bug 373214, bug 373045, bug 372827.

Reported using DrKonqi
Comment 1 Tim Edwards 2016-12-20 22:39:44 UTC 
I can reproduce this all the time - any time I have more than one application open if I right-click any application's icon in the taskbar plasmashell crashes. This only happened since the recent update to 5.8.4 (I'm using the Kubuntu backports PPA on Ubuntu 16.04).

$ kf5-config --version; plasmashell --version; konsole --version
Qt: 5.6.1
KDE Frameworks: 5.28.0
kf5-config: 1.0
plasmashell 5.8.4
Qt: 5.6.1
KDE Frameworks: 5.28.0
Konsole: 16.04.3

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.1 LTS
Release:        16.04
Codename:       xenial
Comment 2 Christoph Feck 2016-12-21 03:20:37 UTC 

*** This bug has been marked as a duplicate of bug 342763 ***