Application: plasmashell (5.4.2)

Qt Version: 5.4.2
Operating System: Linux 4.2.0-34-generic x86_64
Distribution: Ubuntu 15.10

-- Information about the crash:
KDE has three defualt task managers for Plasma taskbar. When I try to choose a different task manager layout from "Alternatives..." menu, the taskbar crashes and then restarts, and the crash reporting prompt appears.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fd6fbfd7800 (LWP 1231))]

Thread 18 (Thread 0x7fd6e5b54700 (LWP 1233)):
#0  0x00007fd6f678288d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fd6fa7c9bd2 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fd6fa7cb74f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fd6e86e9a39 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so
#4  0x00007fd6f6e752be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fd6f5f646aa in start_thread (arg=0x7fd6e5b54700) at pthread_create.c:333
#6  0x00007fd6f678de9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 17 (Thread 0x7fd6defca700 (LWP 1287)):
#0  0x00007fd6f677e43d in read () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fd6ef580f75 in ?? () from /usr/lib/nvidia-352/tls/libnvidia-tls.so.352.63
#2  0x00007fd6f35724e0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd6f352ecd4 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fd6f352f190 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fd6f352f2fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007fd6f70ac29b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fd6f705275a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fd6f6e703d4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fd6f9698f85 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00007fd6f6e752be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007fd6f5f646aa in start_thread (arg=0x7fd6defca700) at pthread_create.c:333
#12 0x00007fd6f678de9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 16 (Thread 0x7fd6d4617700 (LWP 1290)):
#0  0x00007fd6f678288d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fd6f352f1ec in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd6f352f2fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd6f70ac29b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fd6f705275a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fd6f6e703d4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fd6f9698f85 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007fd6f6e752be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fd6f5f646aa in start_thread (arg=0x7fd6d4617700) at pthread_create.c:333
#9  0x00007fd6f678de9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 15 (Thread 0x7fd6d1d2e700 (LWP 1297)):
#0  0x00007fd6f352c2f0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fd6f352eba2 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd6f352f190 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd6f352f2fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fd6f70ac29b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fd6f705275a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fd6f6e703d4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fd6f9698f85 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007fd6f6e752be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fd6f5f646aa in start_thread (arg=0x7fd6d1d2e700) at pthread_create.c:333
#10 0x00007fd6f678de9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 14 (Thread 0x7fd6c3fff700 (LWP 1298)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fd6fba24114 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007fd6fba24159 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007fd6f5f646aa in start_thread (arg=0x7fd6c3fff700) at pthread_create.c:333
#4  0x00007fd6f678de9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 13 (Thread 0x7fd640f69700 (LWP 1322)):
#0  0x00007fd6f35032f4 in g_ptr_array_set_size () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fd6f352e6d1 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd6f352f11b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd6f352f2fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fd6f70ac29b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fd6f705275a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fd6f6e703d4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fd6fa014ef6 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007fd6f6e752be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fd6f5f646aa in start_thread (arg=0x7fd640f69700) at pthread_create.c:333
#10 0x00007fd6f678de9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 12 (Thread 0x7fd639f29700 (LWP 1349)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fd6f6e7655b in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fd6fa087b3e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#3  0x00007fd6fa0883c3 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fd6f6e752be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fd6f5f646aa in start_thread (arg=0x7fd639f29700) at pthread_create.c:333
#6  0x00007fd6f678de9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 11 (Thread 0x7fd633fff700 (LWP 1351)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fd6f6e7655b in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fd6fa087b3e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#3  0x00007fd6fa0883c3 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fd6f6e752be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fd6f5f646aa in start_thread (arg=0x7fd633fff700) at pthread_create.c:333
#6  0x00007fd6f678de9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 10 (Thread 0x7fd62a56d700 (LWP 1402)):
#0  0x00007fd6f3573884 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fd6f352f306 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd6f70ac29b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007fd6f705275a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fd6f6e703d4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fd6309628f7 in KCupsConnection::run() () from /usr/lib/x86_64-linux-gnu/libkcupslib.so
#6  0x00007fd6f6e752be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fd6f5f646aa in start_thread (arg=0x7fd62a56d700) at pthread_create.c:333
#8  0x00007fd6f678de9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 9 (Thread 0x7fd61ee32700 (LWP 1585)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fd6f6e7655b in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fd6fa087b3e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#3  0x00007fd6fa0883c3 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fd6f6e752be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fd6f5f646aa in start_thread (arg=0x7fd61ee32700) at pthread_create.c:333
#6  0x00007fd6f678de9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 8 (Thread 0x7fd617fff700 (LWP 1605)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fd6f6e7655b in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fd6fa087b3e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#3  0x00007fd6fa0883c3 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fd6f6e752be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fd6f5f646aa in start_thread (arg=0x7fd617fff700) at pthread_create.c:333
#6  0x00007fd6f678de9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7fd6177fe700 (LWP 1606)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fd6f6e7655b in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fd6fa087b3e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#3  0x00007fd6fa0883c3 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fd6f6e752be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fd6f5f646aa in start_thread (arg=0x7fd6177fe700) at pthread_create.c:333
#6  0x00007fd6f678de9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7fd61ccc4700 (LWP 1812)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fd6f6e7655b in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fd6fa087b3e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#3  0x00007fd6fa0883c3 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fd6f6e752be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fd6f5f646aa in start_thread (arg=0x7fd61ccc4700) at pthread_create.c:333
#6  0x00007fd6f678de9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7fd614cf5700 (LWP 2491)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fd6f6e7655b in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fd6fa087b3e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#3  0x00007fd6fa0883c3 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fd6f6e752be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fd6f5f646aa in start_thread (arg=0x7fd614cf5700) at pthread_create.c:333
#6  0x00007fd6f678de9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7fd601302700 (LWP 3465)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fd6f6e7655b in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fd6fa087b3e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#3  0x00007fd6fa0883c3 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fd6f6e752be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fd6f5f646aa in start_thread (arg=0x7fd601302700) at pthread_create.c:333
#6  0x00007fd6f678de9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7fd6037ff700 (LWP 3466)):
#0  0x00007fd6f677e44d in read () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fd6ef580f75 in ?? () from /usr/lib/nvidia-352/tls/libnvidia-tls.so.352.63
#2  0x00007fd6f35724e0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd6f352ecd4 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fd6f352f190 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fd6f352f2fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007fd6f70ac29b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fd6f705275a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fd6f6e703d4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fd6f9698f85 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00007fd6f6e752be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007fd6f5f646aa in start_thread (arg=0x7fd6037ff700) at pthread_create.c:333
#12 0x00007fd6f678de9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7fd5fbfff700 (LWP 3467)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fd6f6e7655b in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fd6fa087b3e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#3  0x00007fd6fa0883c3 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fd6f6e752be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fd6f5f646aa in start_thread (arg=0x7fd5fbfff700) at pthread_create.c:333
#6  0x00007fd6f678de9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7fd6fbfd7800 (LWP 1231)):
[KCrash Handler]
#6  0x00007fd6f705c760 in QMetaObject::methodOffset() const () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fd6f7085fbb in QMetaObject::activate(QObject*, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fd6f947ee72 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007fd6f96ddc2a in QQmlDelegateModel::_q_itemsChanged(int, int, QVector<int> const&) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00007fd6f970422c in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#11 0x00007fd6f9704605 in QQmlDelegateModel::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#12 0x00007fd6f7085940 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007fd6f70fc64c in QAbstractItemModel::dataChanged(QModelIndex const&, QModelIndex const&, QVector<int> const&) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007fd63b399fd4 in TaskManager::TasksModelPrivate::itemChanged (this=0x5c46e80, changes=...) at ../../libtaskmanager/tasksmodel.cpp:521
#15 0x00007fd63b39b247 in TaskManager::TasksModel::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=0x7fffa727c3f0) at ./moc_tasksmodel.cpp:213
#16 0x00007fd6f708578a in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00007fd63b3a31a8 in TaskManager::AbstractGroupableItem::changed (this=<optimized out>, _t1=...) at moc_abstractgroupableitem.cpp:222
#18 0x00007fd63b390620 in TaskManager::TaskItemPrivate::filterChange (change=..., this=<optimized out>) at ../../libtaskmanager/taskitem.cpp:73
#19 TaskManager::TaskItem::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at ./moc_taskitem.cpp:146
#20 0x00007fd6f708578a in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007fd63b3a3398 in TaskManager::Task::changed (this=this@entry=0x28d7950, _t1=...) at moc_task.cpp:354
#22 0x00007fd63b382a6b in TaskManager::Task::setActive (this=0x28d7950, a=<optimized out>) at ../../libtaskmanager/task.cpp:178
#23 0x00007fd63b39642c in TaskManager::TaskManager::activeWindowChanged (this=0x7fd63b5c0f80 <TaskManager::(anonymous namespace)::Q_QGS_privateTaskManagerSelf::innerFunction()::holder>, w=<optimized out>) at ../../libtaskmanager/taskmanager.cpp:412
#24 0x00007fd63b3986e7 in TaskManager::TaskManager::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at ./moc_taskmanager.cpp:175
#25 0x00007fd6f708578a in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007fd6f91c4ec2 in KWindowSystem::activeWindowChanged (this=this@entry=0x7fd6f93d3c00 <(anonymous namespace)::Q_QGS_g_kwmInstanceContainer::innerFunction()::holder>, _t1=100663509) at moc_kwindowsystem.cpp:302
#27 0x00007fd6df1de1e1 in NETEventFilter::nativeEventFilter (this=0x2cfdd90, ev=0x7fd6e0003b30) at ../../../../src/platforms/xcb/kwindowsystem.cpp:208
#28 0x00007fd6f70518ef in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#29 0x00007fd6e86eb35e in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so
#30 0x00007fd6e86ec3b3 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so
#31 0x00007fd6f7086651 in QObject::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#32 0x00007fd6f7b32b8c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#33 0x00007fd6f7b38230 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#34 0x00007fd6f7054f1b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#35 0x00007fd6f7057057 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#36 0x00007fd6f70abe73 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#37 0x00007fd6f352eff7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#38 0x00007fd6f352f250 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#39 0x00007fd6f352f2fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#40 0x00007fd6f70ac27f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#41 0x00007fd6f705275a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#42 0x00007fd6f705a2cc in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#43 0x00000000004322c3 in main (argc=2, argv=<optimized out>) at ../../shell/main.cpp:176

Possible duplicates by query: bug 360375, bug 360368, bug 360088, bug 359884, bug 359852.

Reported using DrKonqi