Plasmashell crashes 5-10 times in hour and automatically restarts. It is totally random, when i open an application, or minimize it, or just surfing the web or opening a file from dolphin in libre. Cannot find any pattern.

This started to happen after installation of kde 5.5.3 from ppa:kubuntu-ppa/backports-landing.
I am running Kubuntu 15.10.

It doesn't crash when computer is not used!!!

When i tried to report it automatically from crash report, drkonqi also crashed :(
I have managed to copy/paste crash report backtrace.


Reproducible: Sometimes




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 0x7ff8f8fb1800 (LWP 8681))]
 
Thread 8 (Thread 0x7ff8e43d3700 (LWP 8684)):
#0  0x00007ff8f36b38dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007ff8f7781bd2 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007ff8f778374f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007ff8e651c7e9 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007ff8f3da9a6e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ff8f2e956aa in start_thread (arg=0x7ff8e43d3700) at pthread_create.c:333
#6  0x00007ff8f36beeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
 
Thread 7 (Thread 0x7ff8e1bc4700 (LWP 8686)):
#0  0x00007ff8f8f7488c in update_get_addr (ti=0x7ff8f41d56f8) at dl-tls.c:804
#1  0x00007ff8f3da89b2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007ff8f3fe0a6a in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007ff8f044877d in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007ff8f044911b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007ff8f04492fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007ff8f3fe150b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007ff8f3f8850a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007ff8f3da4ac4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007ff8f6652c35 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00007ff8f3da9a6e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007ff8f2e956aa in start_thread (arg=0x7ff8e1bc4700) at pthread_create.c:333
#12 0x00007ff8f36beeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
 
Thread 6 (Thread 0x7ff8d2625700 (LWP 8687)):
#0  0x00007ff8f048d884 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007ff8f04481ee in g_main_context_acquire () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ff8f04490a5 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ff8f04492fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007ff8f3fe150b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ff8f3f8850a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007ff8f3da4ac4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007ff8f6652c35 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007ff8f3da9a6e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007ff8f2e956aa in start_thread (arg=0x7ff8d2625700) at pthread_create.c:333
#10 0x00007ff8f36beeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
 
Thread 5 (Thread 0x7ff8cbfff700 (LWP 8688)):
#0  0x00007ff8f36af49d in read () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007ff8f048c4e0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ff8f0448cd4 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ff8f0449190 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007ff8f04492fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007ff8f3fe150b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007ff8f3f8850a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007ff8f3da4ac4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007ff8f6652c35 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007ff8f3da9a6e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007ff8f2e956aa in start_thread (arg=0x7ff8cbfff700) at pthread_create.c:333
#11 0x00007ff8f36beeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
 
Thread 4 (Thread 0x7ff8cadf6700 (LWP 8689)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007ff8f89fb194 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007ff8f89fb1d9 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007ff8f2e956aa in start_thread (arg=0x7ff8cadf6700) at pthread_create.c:333
#4  0x00007ff8f36beeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
 
Thread 3 (Thread 0x7ff843929700 (LWP 8690)):
#0  0x00007ff8f3fe0ad0 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#1  0x00007ff8f044877d in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ff8f044911b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ff8f04492fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007ff8f3fe150b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ff8f3f8850a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007ff8f3da4ac4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007ff8f6fdb2a6 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007ff8f3da9a6e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007ff8f2e956aa in start_thread (arg=0x7ff843929700) at pthread_create.c:333
#10 0x00007ff8f36beeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
 
Thread 2 (Thread 0x7ff83159e700 (LWP 8695)):
#0  0x00007ff8f36b38dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007ff8f04491ec in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ff8f04492fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ff8f3fe150b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ff8f3f8850a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ff8f3da4ac4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007ff833835817 in KCupsConnection::run() () from /usr/lib/x86_64-linux-gnu/libkcupslib.so
#7  0x00007ff8f3da9a6e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007ff8f2e956aa in start_thread (arg=0x7ff83159e700) at pthread_create.c:333
#9  0x00007ff8f36beeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
 
Thread 1 (Thread 0x7ff8f8fb1800 (LWP 8681)):
[KCrash Handler]
#6  0x00007ff8f6420f18 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007ff8f66944aa in QQmlDelegateModel::_q_itemsChanged(int, int, QVector<int> const&) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007ff8f66bbb7c in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007ff8f66bc368 in QQmlDelegateModel::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00007ff8f3fb9aa0 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007ff8f4035dfc in QAbstractItemModel::dataChanged(QModelIndex const&, QModelIndex const&, QVector<int> const&) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007ff8414eea94 in TaskManager::TasksModelPrivate::itemChanged (this=0x48e8950, changes=...) at ../../libtaskmanager/tasksmodel.cpp:521
#13 0x00007ff8414efd37 in TaskManager::TasksModel::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=0x7ffce1ae6460) at ./moc_tasksmodel.cpp:214
#14 0x00007ff8f3fb98ea in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007ff8414f7d38 in TaskManager::AbstractGroupableItem::changed (this=<optimized out>, _t1=...) at moc_abstractgroupableitem.cpp:223
#16 0x00007ff8414e46b0 in TaskManager::TaskItemPrivate::filterChange (change=..., this=<optimized out>) at ../../libtaskmanager/taskitem.cpp:73
#17 TaskManager::TaskItem::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at ./moc_taskitem.cpp:147
#18 0x00007ff8f3fb98ea in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007ff8414f7f28 in TaskManager::Task::changed (this=this@entry=0x48b40b0, _t1=...) at moc_task.cpp:359
#20 0x00007ff8414d5f5b in TaskManager::Task::setActive (this=0x48b40b0, a=<optimized out>) at ../../libtaskmanager/task.cpp:178
#21 0x00007ff8414ea619 in TaskManager::TaskManager::activeWindowChanged (this=0x7ff841716fa0 <TaskManager::(anonymous namespace)::Q_QGS_privateTaskManagerSelf::innerFunction()::holder>, w=<optimized out>) at ../../libtaskmanager/taskmanager.cpp:412
#22 0x00007ff8f3fb9777 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#23 0x00007ff8f61676a2 in KWindowSystem::activeWindowChanged(unsigned long long) () from /usr/lib/x86_64-linux-gnu/libKF5WindowSystem.so.5
#24 0x00007ff8e1dd83ab in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/kf5/org.kde.kwindowsystem.platforms/KF5WindowSystemX11Plugin.so
#25 0x00007ff8f3f8769f in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007ff8e6520254 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#27 0x00007ff8e6521003 in QXcbConnection::processXcbEvents() () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#28 0x00007ff8f3fba7b1 in QObject::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#29 0x00007ff8f4a8f9dc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#30 0x00007ff8f4a94ea6 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#31 0x00007ff8f3f8ad7b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#32 0x00007ff8f3f8d176 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#33 0x00007ff8f3fe10e3 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#34 0x00007ff8f0448ff7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#35 0x00007ff8f0449250 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#36 0x00007ff8f04492fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#37 0x00007ff8f3fe14ef in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#38 0x00007ff8f3f8850a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#39 0x00007ff8f3f905ec in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#40 0x000000000043258a in main (argc=4, argv=<optimized out>) at ../../shell/main.cpp:179