Bug 378707

Summary: [Wayland] Plasma crashes when browsing system settings
Product: [Plasma] plasmashell Reporter: Germano Massullo (Thetra) <germano.massullo>
Component: Task Manager and Icons-Only Task Manager widgetsAssignee: Eike Hein <hein>
Status: RESOLVED DUPLICATE    
Severity: crash CC: courthicks1, kde, plasma-bugs-null, simonandric5
Priority: NOR    
Version First Reported In: 5.9.4   
Target Milestone: 1.0   
Platform: Other   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Germano Massullo (Thetra) 2017-04-12 17:12:28 UTC 
Fedora 25 KDE with Wayland: Plasma crashes when browsing system settings


Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
84	T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
[Current thread is 1 (Thread 0x7efc270373c0 (LWP 22620))]

Thread 13 (Thread 0x7efb75424700 (LWP 22636)):
#0  0x00007efc3320d460 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007efc34ace04a in QWaitConditionPrivate::wait(unsigned long) (time=18446744073709551615, this=0x55dcac449c50) at thread/qwaitcondition_unix.cpp:143
#2  0x00007efc34ace04a in QWaitCondition::wait(QMutex*, unsigned long) (this=this@entry=0x55dcac449b18, mutex=mutex@entry=0x55dcac449b10, time=time@entry=18446744073709551615) at thread/qwaitcondition_unix.cpp:215
#3  0x00007efc387778c5 in QSGRenderThreadEventQueue::takeEvent(bool) (wait=true, this=0x55dcac449b08) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/quick/scenegraph/qsgthreadedrenderloop.cpp:242
#4  0x00007efc387778c5 in QSGRenderThread::processEventsAndWaitForMore() (this=this@entry=0x55dcac449a90) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/quick/scenegraph/qsgthreadedrenderloop.cpp:690
#5  0x00007efc387781ba in QSGRenderThread::run() (this=0x55dcac449a90) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/quick/scenegraph/qsgthreadedrenderloop.cpp:719
#6  0x00007efc34acd9ca in QThreadPrivate::start(void*) (arg=0x55dcac449a90) at thread/qthread_unix.cpp:368
#7  0x00007efc332076ca in start_thread (arg=0x7efb75424700) at pthread_create.c:333
#8  0x00007efc33ec0f7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 12 (Thread 0x7efb762e0700 (LWP 22631)):
#0  0x00007efc2ca3d544 in g_main_context_prepare (context=context@entry=0x7efb70000990, priority=priority@entry=0x7efb762dfad0) at gmain.c:3429
#1  0x00007efc2ca3e08b in g_main_context_iterate (context=context@entry=0x7efb70000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3909
#2  0x00007efc2ca3e27c in g_main_context_iteration (context=0x7efb70000990, may_block=may_block@entry=1) at gmain.c:3990
#3  0x00007efc34cbb6eb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7efb700008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007efc34c6c68a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7efb762dfc10, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#5  0x00007efc34ac95e3 in QThread::exec() (this=this@entry=0x55dcac431b40) at thread/qthread.cpp:507
#6  0x00007efc387088b6 in QQuickPixmapReader::run() (this=0x55dcac431b40) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/quick/util/qquickpixmapcache.cpp:822
#7  0x00007efc34acd9ca in QThreadPrivate::start(void*) (arg=0x55dcac431b40) at thread/qthread_unix.cpp:368
#8  0x00007efc332076ca in start_thread (arg=0x7efb762e0700) at pthread_create.c:333
#9  0x00007efc33ec0f7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 11 (Thread 0x7efb7d95b700 (LWP 22630)):
#0  0x00007efc3320d460 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007efb83541c5b in cnd_wait (mtx=0x55dcabfbb268, cond=0x55dcabfbb290) at ../../../include/c11/threads_posix.h:159
#2  0x00007efb83541c5b in util_queue_thread_func (input=input@entry=0x55dcac070680) at util/u_queue.c:76
#3  0x00007efb83541ab7 in impl_thrd_routine (p=<optimized out>) at ../../../include/c11/threads_posix.h:87
#4  0x00007efc332076ca in start_thread (arg=0x7efb7d95b700) at pthread_create.c:333
#5  0x00007efc33ec0f7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 10 (Thread 0x7efb7e15c700 (LWP 22629)):
#0  0x00007efc3320d460 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007efb83541c5b in cnd_wait (mtx=0x55dcabfbb268, cond=0x55dcabfbb290) at ../../../include/c11/threads_posix.h:159
#2  0x00007efb83541c5b in util_queue_thread_func (input=input@entry=0x55dcac06fee0) at util/u_queue.c:76
#3  0x00007efb83541ab7 in impl_thrd_routine (p=<optimized out>) at ../../../include/c11/threads_posix.h:87
#4  0x00007efc332076ca in start_thread (arg=0x7efb7e15c700) at pthread_create.c:333
#5  0x00007efc33ec0f7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 9 (Thread 0x7efb7e95d700 (LWP 22628)):
#0  0x00007efc3320d460 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007efb83541c5b in cnd_wait (mtx=0x55dcabfbb268, cond=0x55dcabfbb290) at ../../../include/c11/threads_posix.h:159
#2  0x00007efb83541c5b in util_queue_thread_func (input=input@entry=0x55dcac06ffa0) at util/u_queue.c:76
#3  0x00007efb83541ab7 in impl_thrd_routine (p=<optimized out>) at ../../../include/c11/threads_posix.h:87
#4  0x00007efc332076ca in start_thread (arg=0x7efb7e95d700) at pthread_create.c:333
#5  0x00007efc33ec0f7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 8 (Thread 0x7efb7f15e700 (LWP 22627)):
#0  0x00007efc3320d460 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007efb83541c5b in cnd_wait (mtx=0x55dcabfbb268, cond=0x55dcabfbb290) at ../../../include/c11/threads_posix.h:159
#2  0x00007efb83541c5b in util_queue_thread_func (input=input@entry=0x55dcac066780) at util/u_queue.c:76
#3  0x00007efb83541ab7 in impl_thrd_routine (p=<optimized out>) at ../../../include/c11/threads_posix.h:87
#4  0x00007efc332076ca in start_thread (arg=0x7efb7f15e700) at pthread_create.c:333
#5  0x00007efc33ec0f7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 7 (Thread 0x7efb7fb64700 (LWP 22626)):
#0  0x00007efc3320d460 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007efb83541c5b in cnd_wait (mtx=0x55dcabea57b8, cond=0x55dcabea57e0) at ../../../include/c11/threads_posix.h:159
#2  0x00007efb83541c5b in util_queue_thread_func (input=input@entry=0x55dcac06ca60) at util/u_queue.c:76
#3  0x00007efb83541ab7 in impl_thrd_routine (p=<optimized out>) at ../../../include/c11/threads_posix.h:87
#4  0x00007efc332076ca in start_thread (arg=0x7efb7fb64700) at pthread_create.c:333
#5  0x00007efc33ec0f7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 6 (Thread 0x7efc0edb0700 (LWP 22625)):
#0  0x00007efc3320d460 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007efc3a7c92f4 in QTWTF::TCMalloc_PageHeap::scavengerThread() (this=0x7efc3a8b5380 <QTWTF::pageheap_memory>) at /usr/src/debug/qtscript-opensource-src-5.7.1/src/3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#2  0x00007efc3a7c9339 in QTWTF::TCMalloc_PageHeap::runScavengerThread(void*) (context=<optimized out>) at /usr/src/debug/qtscript-opensource-src-5.7.1/src/3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#3  0x00007efc332076ca in start_thread (arg=0x7efc0edb0700) at pthread_create.c:333
#4  0x00007efc33ec0f7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 5 (Thread 0x7efc0fbec700 (LWP 22624)):
#0  0x00007efc33eb501d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007efc2ca3e166 in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7efc04003070, timeout=<optimized out>, context=0x7efc04000990) at gmain.c:4228
#2  0x00007efc2ca3e166 in g_main_context_iterate (context=context@entry=0x7efc04000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3924
#3  0x00007efc2ca3e27c in g_main_context_iteration (context=0x7efc04000990, may_block=may_block@entry=1) at gmain.c:3990
#4  0x00007efc34cbb6eb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7efc040008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#5  0x00007efc34c6c68a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7efc0fbebc80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#6  0x00007efc34ac95e3 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:507
#7  0x00007efc34acd9ca in QThreadPrivate::start(void*) (arg=0x55dcabcfc770) at thread/qthread_unix.cpp:368
#8  0x00007efc332076ca in start_thread (arg=0x7efc0fbec700) at pthread_create.c:333
#9  0x00007efc33ec0f7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 4 (Thread 0x7efc1618f700 (LWP 22623)):
#0  0x00007efc34acc99b in QThreadData::current(bool) (createIfNecessary=createIfNecessary@entry=true) at thread/qthread_unix.cpp:263
#1  0x00007efc34cbb58a in postEventSourcePrepare(GSource*, gint*) (s=0x7efc080012d0, timeout=timeout@entry=0x7efc1618ea94) at kernel/qeventdispatcher_glib.cpp:252
#2  0x00007efc2ca3d69d in g_main_context_prepare (context=context@entry=0x7efc08000990, priority=priority@entry=0x7efc1618eb20) at gmain.c:3501
#3  0x00007efc2ca3e08b in g_main_context_iterate (context=context@entry=0x7efc08000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3909
#4  0x00007efc2ca3e27c in g_main_context_iteration (context=0x7efc08000990, may_block=may_block@entry=1) at gmain.c:3990
#5  0x00007efc34cbb6eb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7efc080008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#6  0x00007efc34c6c68a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7efc1618ec60, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#7  0x00007efc34ac95e3 in QThread::exec() (this=this@entry=0x55dcabc1ed50) at thread/qthread.cpp:507
#8  0x00007efc37d7d4e5 in QQmlThreadPrivate::run() (this=0x55dcabc1ed50) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/qml/ftw/qqmlthread.cpp:147
#9  0x00007efc34acd9ca in QThreadPrivate::start(void*) (arg=0x55dcabc1ed50) at thread/qthread_unix.cpp:368
#10 0x00007efc332076ca in start_thread (arg=0x7efc1618f700) at pthread_create.c:333
#11 0x00007efc33ec0f7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 3 (Thread 0x7efc177da700 (LWP 22622)):
#0  0x00007efc2ca83894 in g_mutex_unlock (mutex=0x7efc10000990) at gthread-posix.c:1348
#1  0x00007efc2ca3dbc1 in g_main_context_check (context=context@entry=0x7efc10000990, max_priority=2147483647, fds=fds@entry=0x7efc10003070, n_fds=n_fds@entry=1) at gmain.c:3760
#2  0x00007efc2ca3e104 in g_main_context_iterate (context=context@entry=0x7efc10000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3926
#3  0x00007efc2ca3e27c in g_main_context_iteration (context=0x7efc10000990, may_block=may_block@entry=1) at gmain.c:3990
#4  0x00007efc34cbb6eb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7efc100008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#5  0x00007efc34c6c68a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7efc177d9c60, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#6  0x00007efc34ac95e3 in QThread::exec() (this=this@entry=0x55dcabbaf120) at thread/qthread.cpp:507
#7  0x00007efc37d7d4e5 in QQmlThreadPrivate::run() (this=0x55dcabbaf120) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/qml/ftw/qqmlthread.cpp:147
#8  0x00007efc34acd9ca in QThreadPrivate::start(void*) (arg=0x55dcabbaf120) at thread/qthread_unix.cpp:368
#9  0x00007efc332076ca in start_thread (arg=0x7efc177da700) at pthread_create.c:333
#10 0x00007efc33ec0f7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 2 (Thread 0x7efc1d35d700 (LWP 22621)):
#0  0x00007efc2ca83879 in g_mutex_lock (mutex=mutex@entry=0x7efc18000990) at gthread-posix.c:1336
#1  0x00007efc2ca3dbd6 in g_main_context_check (context=context@entry=0x7efc18000990, max_priority=2147483647, fds=fds@entry=0x7efc18003220, n_fds=n_fds@entry=1) at gmain.c:3766
#2  0x00007efc2ca3e104 in g_main_context_iterate (context=context@entry=0x7efc18000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3926
#3  0x00007efc2ca3e27c in g_main_context_iteration (context=0x7efc18000990, may_block=may_block@entry=1) at gmain.c:3990
#4  0x00007efc34cbb6eb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7efc180008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#5  0x00007efc34c6c68a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7efc1d35cc40, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#6  0x00007efc34ac95e3 in QThread::exec() (this=this@entry=0x7efc353df060 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread.cpp:507
#7  0x00007efc35369739 in QDBusConnectionManager::run() (this=0x7efc353df060 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:178
#8  0x00007efc34acd9ca in QThreadPrivate::start(void*) (arg=0x7efc353df060 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread_unix.cpp:368
#9  0x00007efc332076ca in start_thread (arg=0x7efc1d35d700) at pthread_create.c:333
#10 0x00007efc33ec0f7f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 1 (Thread 0x7efc270373c0 (LWP 22620)):
[KCrash Handler]
#6  0x00007efc37d01ef4 in QScopedPointer<QObjectData, QScopedPointerDeleter<QObjectData> >::data() const (this=<error reading variable: Cannot access memory at address 0x30>) at /usr/include/qt5/QtCore/qscopedpointer.h:141
#7  0x00007efc37d01ef4 in qGetPtrHelper<QScopedPointer<QObjectData> > (p=<error reading variable: Cannot access memory at address 0x30>) at /usr/include/qt5/QtCore/qglobal.h:980
#8  0x00007efc37d01ef4 in QQmlEngine::d_func() (this=#9  0x00007efc37d01ef4 in QQmlEnginePrivate::get(QQmlEngine*) (e=#10 0x00007efc37d01ef4 in QQmlIncubator::clear() (this=this@entry=0x55dcabe84e80) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/qml/qqmlincubator.cpp:569
#11 0x00007efc37d9fe68 in QQmlDelegateModelPrivate::releaseIncubator(QQDMIncubationTask*) (this=this@entry=0x55dcaca8e960, incubationTask=0x55dcabe84e80) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/types/qqmldelegatemodel.cpp:846
#12 0x00007efc37da25ab in QQmlDelegateModelPrivate::itemsRemoved(QVector<QQmlListCompositor::Remove> const&, QVarLengthArray<QVector<QQmlChangeSet::Change>, 11>*, QHash<int, QList<QQmlDelegateModelItem*> >*) (this=this@entry=0x55dcaca8e960, removes=..., translatedRemoves=translatedRemoves@entry=0x7fffe6c6f940, movedItems=movedItems@entry=0x0) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/types/qqmldelegatemodel.cpp:1320
#13 0x00007efc37da2a62 in QQmlDelegateModelPrivate::itemsRemoved(QVector<QQmlListCompositor::Remove> const&) (this=this@entry=0x55dcaca8e960, removes=...) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/types/qqmldelegatemodel.cpp:1357
#14 0x00007efc37da4178 in QQmlDelegateModel::_q_itemsRemoved(int, int) (this=<optimized out>, index=0, count=2) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/types/qqmldelegatemodel.cpp:1389
#15 0x00007efc37da4818 in QQmlDelegateModel::_q_rowsRemoved(QModelIndex const&, int, int) (this=<optimized out>, parent=..., begin=<optimized out>, end=<optimized out>) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/types/qqmldelegatemodel.cpp:1539
#16 0x00007efc37dc8425 in QQmlDelegateModel::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) (_o=_o@entry=0x55dcaca8d6d0, _c=_c@entry=QMetaObject::InvokeMetaMethod, _id=_id@entry=10, _a=_a@entry=0x7fffe6c6fc40) at .moc/moc_qqmldelegatemodel_p.cpp:196
#17 0x00007efc37dc8ba8 in QQmlDelegateModel::qt_metacall(QMetaObject::Call, int, void**) (this=0x55dcaca8d6d0, _c=QMetaObject::InvokeMetaMethod, _id=10, _a=0x7fffe6c6fc40) at .moc/moc_qqmldelegatemodel_p.cpp:334
#18 0x00007efc34c9489b in QMetaObject::activate(QObject*, int, int, void**) (sender=sender@entry=0x55dcaca8ef20, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=12, argv=argv@entry=0x7fffe6c6fc40) at kernel/qobject.cpp:3755
#19 0x00007efc34c94fc7 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) (sender=sender@entry=0x55dcaca8ef20, m=m@entry=0x7efc34ea9420 <QAbstractItemModel::staticMetaObject>, local_signal_index=local_signal_index@entry=12, argv=argv@entry=0x7fffe6c6fc40) at kernel/qobject.cpp:3602
#20 0x00007efc34d01f14 in QAbstractItemModel::rowsRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) (this=this@entry=0x55dcaca8ef20, _t1=..., _t2=<optimized out>, _t3=<optimized out>) at .moc/moc_qabstractitemmodel.cpp:615
#21 0x00007efc34c2383e in QAbstractItemModel::endRemoveRows() (this=0x55dcaca8ef20) at itemmodels/qabstractitemmodel.cpp:2715
#22 0x00007efc34c3d91b in QSortFilterProxyModelPrivate::remove_proxy_interval(QVector<int>&, QVector<int>&, int, int, QModelIndex const&, Qt::Orientation, bool) (this=this@entry=0x55dcaca8ed80, source_to_proxy=..., proxy_to_source=..., proxy_start=<optimized out>, proxy_end=<optimized out>, proxy_parent=..., orient=Qt::Vertical, emit_signal=true) at itemmodels/qsortfilterproxymodel.cpp:595
#23 0x00007efc34c42237 in QSortFilterProxyModelPrivate::remove_source_items(QVector<int>&, QVector<int>&, QVector<int> const&, QModelIndex const&, Qt::Orientation, bool) (this=this@entry=0x55dcaca8ed80, source_to_proxy=..., proxy_to_source=..., source_items=..., source_parent=..., orient=orient@entry=Qt::Vertical, emit_signal=true) at itemmodels/qsortfilterproxymodel.cpp:565
#24 0x00007efc34c42444 in QSortFilterProxyModelPrivate::source_items_about_to_be_removed(QModelIndex const&, int, int, Qt::Orientation) (this=0x55dcaca8ed80, source_parent=..., start=0, end=1, orient=orient@entry=Qt::Vertical) at itemmodels/qsortfilterproxymodel.cpp:866
#25 0x00007efc34c44868 in QSortFilterProxyModelPrivate::_q_sourceRowsAboutToBeRemoved(QModelIndex const&, int, int) (end=<optimized out>, start=<optimized out>, source_parent=..., this=<optimized out>) at itemmodels/qsortfilterproxymodel.cpp:1417
#26 0x00007efc34c44868 in QSortFilterProxyModel::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at .moc/moc_qsortfilterproxymodel.cpp:210
#27 0x00007efc34c94721 in QMetaObject::activate(QObject*, int, int, void**) (sender=sender@entry=0x55dcabe753f0, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=11, argv=argv@entry=0x7fffe6c6ff70) at kernel/qobject.cpp:3740
#28 0x00007efc34c94fc7 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) (sender=sender@entry=0x55dcabe753f0, m=m@entry=0x7efc34ea9420 <QAbstractItemModel::staticMetaObject>, local_signal_index=local_signal_index@entry=11, argv=argv@entry=0x7fffe6c6ff70) at kernel/qobject.cpp:3602
#29 0x00007efc34d01ea4 in QAbstractItemModel::rowsAboutToBeRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) (this=this@entry=0x55dcabe753f0, _t1=..., _t2=<optimized out>, _t2@entry=0, _t3=<optimized out>, _t3@entry=1) at .moc/moc_qabstractitemmodel.cpp:608
#30 0x00007efc34c22fb3 in QAbstractItemModel::beginRemoveRows(QModelIndex const&, int, int) (this=0x55dcabe753f0, parent=..., first=0, last=1) at itemmodels/qabstractitemmodel.cpp:2698
#31 0x00007efc37dac797 in QQmlListModel::emitItemsAboutToBeRemoved(int, int) (this=<optimized out>, index=<optimized out>, count=<optimized out>) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/types/qqmllistmodel.cpp:1788
#32 0x00007efc37daf6cf in QQmlListModel::clear() (this=0x55dcabe753f0) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/types/qqmllistmodel.cpp:2006
#33 0x00007efc37dc9ddd in QQmlListModel::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) (_o=_o@entry=0x55dcabe753f0, _c=_c@entry=QMetaObject::InvokeMetaMethod, _id=_id@entry=1, _a=_a@entry=0x7fffe6c70230) at .moc/moc_qqmllistmodel_p.cpp:123
#34 0x00007efc37dca048 in QQmlListModel::qt_metacall(QMetaObject::Call, int, void**) (this=0x55dcabe753f0, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0x7fffe6c70230) at .moc/moc_qqmllistmodel_p.cpp:206
#35 0x00007efc37d362a9 in QQmlObjectOrGadget::metacall(QMetaObject::Call, int, void**) const (this=this@entry=0x7fffe6c70580, type=type@entry=QMetaObject::InvokeMetaMethod, index=<optimized out>, index@entry=56, argv=argv@entry=0x7fffe6c70230) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/qml/qqmlpropertycache.cpp:1547
#36 0x00007efc37cc59cf in CallMethod(QQmlObjectOrGadget const&, int, int, int, int*, QV4::ExecutionEngine*, QV4::CallData*) (object=..., index=56, returnType=returnType@entry=43, argCount=argCount@entry=0, argTypes=argTypes@entry=0x0, engine=engine@entry=0x55dcabc1e6a0, callArgs=0x7efc15190428) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/jsruntime/qv4qobjectwrapper.cpp:1155
#37 0x00007efc37cc5e89 in CallPrecise(QQmlObjectOrGadget const&, QQmlPropertyData const&, QV4::ExecutionEngine*, QV4::CallData*) (object=..., data=..., engine=engine@entry=0x55dcabc1e6a0, callArgs=callArgs@entry=0x7efc15190428) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/jsruntime/qv4qobjectwrapper.cpp:1392
#38 0x00007efc37cc67e5 in QV4::QObjectMethod::callInternal(QV4::CallData*) const (this=<optimized out>, callData=<optimized out>) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/jsruntime/qv4qobjectwrapper.cpp:1871
#39 0x00007efc37cdbf41 in QV4::Object::call(QV4::CallData*) const (d=0x7efc15190428, this=<optimized out>) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/jsruntime/qv4object_p.h:332
#40 0x00007efc37cdbf41 in QV4::Runtime::callProperty(QV4::ExecutionEngine*, int, QV4::CallData*) (engine=0x55dcabc1e6a0, nameIndex=<optimized out>, callData=0x7efc15190428) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/jsruntime/qv4runtime.cpp:1030
#41 0x00007efb54101167 in  ()
#42 0xffff54a354a354a3 in  ()
#43 0xffff54ae54ae54ae in  ()
#44 0x0003200000000001 in  ()
#45 0xffff54c454c454c4 in  ()
#46 0xffff54ce54ce54ce in  ()
#47 0xe689ee16e2f89b00 in  ()
#48 0xffff54e454e454e4 in  ()
#49 0x00007efc151903e8 in  ()
#50 0x00007efc151903e0 in  ()
#51 0x000055dcabc1e6a0 in  ()
#52 0x00007efc15190370 in  ()
#53 0x00007efc37c7457b in QV4::SimpleScriptFunction::call(QV4::Managed const*, QV4::CallData*) (that=<optimized out>, callData=<optimized out>) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/jsruntime/qv4functionobject.cpp:582
#54 0x00007efc37cdb993 in QV4::Object::call(QV4::CallData*) const (d=0x7efc15190388, this=0x7efc151903d8) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/jsruntime/qv4object_p.h:332
#55 0x00007efc37cdb993 in QV4::Runtime::callActivationProperty(QV4::ExecutionEngine*, int, QV4::CallData*) (engine=0x55dcabc1e6a0, nameIndex=<optimized out>, callData=0x7efc15190388) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/jsruntime/qv4runtime.cpp:980
#56 0x00007efb541046e3 in  ()
#57 0xffff571657165716 in  ()
#58 0xffff572057205720 in  ()
#59 0xffff572b572b572b in  ()
#60 0xffff573657365736 in  ()
#61 0xffff574157415741 in  ()
#62 0xffff574c574c574c in  ()
#63 0x00007efc15190370 in  ()
#64 0x00007efc15190368 in  ()
#65 0x00007efc15190010 in  ()
#66 0x00007efc37c7457b in QV4::SimpleScriptFunction::call(QV4::Managed const*, QV4::CallData*) (that=<optimized out>, callData=<optimized out>) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/jsruntime/qv4functionobject.cpp:582
#67 0x00007efc37d61d17 in QV4::Object::call(QV4::CallData*) const (d=0x7efc15190318, this=<optimized out>) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/jsruntime/qv4object_p.h:332
#68 0x00007efc37d61d17 in QQmlJavaScriptExpression::evaluate(QV4::CallData*, bool*) (this=this@entry=0x55dcabe74c50, callData=callData@entry=0x7efc15190318, isUndefined=isUndefined@entry=0x0) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/qml/qqmljavascriptexpression.cpp:196
#69 0x00007efc37d081e6 in QQmlBoundSignalExpression::evaluate(void**) (this=<optimized out>, a=<optimized out>) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/qml/qqmlboundsignal.cpp:247
#70 0x00007efc37d0937b in QQmlBoundSignal_callback(QQmlNotifierEndpoint*, void**) (e=0x55dcabe74a70, a=0x0) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/qml/qqmlboundsignal.cpp:379
#71 0x00007efc37d3f714 in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) (endpoint=<optimized out>, a=a@entry=0x0) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/qml/qqmlnotifier.cpp:100
#72 0x00007efc37cea3fc in QQmlData::signalEmitted(QAbstractDeclarativeData*, QObject*, int, void**) (object=0x55dcaca80440, index=3, a=0x0) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/qml/qqmlengine.cpp:779
#73 0x00007efc34c94ddb in QMetaObject::activate(QObject*, int, int, void**) (sender=sender@entry=0x55dcaca80440, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3618
#74 0x00007efc34c94fc7 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) (sender=sender@entry=0x55dcaca80440, m=m@entry=0x7efc37e9dee0 <QQmlComponentAttached::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3602
#75 0x00007efc37dc5b20 in QQmlComponentAttached::completed() (this=this@entry=0x55dcaca80440) at .moc/moc_qqmlcomponentattached_p.cpp:137
#76 0x00007efc37d73c38 in QQmlObjectCreator::finalize(QQmlInstantiationInterrupt&) (this=0x55dcaca86a60, interrupt=...) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/qml/qqmlobjectcreator.cpp:1269
#77 0x00007efc37d022f2 in QQmlIncubatorPrivate::incubate(QQmlInstantiationInterrupt&) (this=0x55dcabca6c50, i=...) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/qml/qqmlincubator.cpp:354
#78 0x00007efc37d02ef4 in QQmlIncubationController::incubateFor(int) (this=this@entry=0x55dcabc54c10, msecs=<optimized out>) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/qml/qqmlincubator.cpp:401
#79 0x00007efc389fc4cc in KDeclarative::QmlObjectIncubationController::incubate() (this=0x55dcabc54c00) at /usr/src/debug/kdeclarative-5.33.0/src/kdeclarative/private/qmlobject_p.h:63
#80 0x00007efc389fc4cc in KDeclarative::QmlObjectIncubationController::incubatingObjectCountChanged(int) (this=0x55dcabc54c00, count=1) at /usr/src/debug/kdeclarative-5.33.0/src/kdeclarative/private/qmlobject_p.h:79
#81 0x00007efc37d01cf6 in QQmlIncubatorPrivate::clear() (this=this@entry=0x55dcac07bf90) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/qml/qqmlincubator.cpp:155
#82 0x00007efc37d023e3 in QQmlIncubatorPrivate::incubate(QQmlInstantiationInterrupt&) (this=this@entry=0x55dcac07bf90, i=...) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/qml/qqmlincubator.cpp:366
#83 0x00007efc37d02db8 in QQmlIncubatorPrivate::forceCompletion(QQmlInstantiationInterrupt&) (this=0x55dcac07bf90, i=...) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/qml/qqmlincubator.cpp:275
#84 0x00007efc37d02d94 in QQmlIncubatorPrivate::forceCompletion(QQmlInstantiationInterrupt&) (this=0x55dcabca6c50, i=...) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/qml/qqmlincubator.cpp:273
#85 0x00007efc37d02e1c in QQmlIncubator::forceCompletion() (this=<optimized out>) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/qml/qml/qqmlincubator.cpp:606
#86 0x00007efc389f8ed8 in KDeclarative::QmlObject::completeInitialization(QHash<QString, QVariant> const&) (this=0x55dcabc97da0, initialProperties=...) at /usr/src/debug/kdeclarative-5.33.0/src/kdeclarative/qmlobject.cpp:328
#87 0x00007efc3a8f7d8e in PlasmaQuick::AppletQuickItem::init() (this=this@entry=0x55dcabc8cb40) at /usr/src/debug/plasma-framework-5.33.0/src/plasmaquick/appletquickitem.cpp:557
#88 0x00007efc161a4da4 in AppletInterface::init() (this=0x55dcabc8cb40) at /usr/src/debug/plasma-framework-5.33.0/src/scriptengines/qml/plasmoid/appletinterface.cpp:157
#89 0x00007efc3a8f8f08 in PlasmaQuick::AppletQuickItem::itemChange(QQuickItem::ItemChange, QQuickItem::ItemChangeData const&) (this=0x55dcabc8cb40, change=QQuickItem::ItemSceneChange, value=...) at /usr/src/debug/plasma-framework-5.33.0/src/plasmaquick/appletquickitem.cpp:804
#90 0x00007efc38790805 in QQuickItemPrivate::itemChange(QQuickItem::ItemChange, QQuickItem::ItemChangeData const&) (this=this@entry=0x55dcabc87c60, change=change@entry=QQuickItem::ItemSceneChange, data=...) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/quick/items/qquickitem.cpp:5990
#91 0x00007efc3879598e in QQuickItemPrivate::refWindow(QQuickWindow*) (this=0x55dcabc87c60, c=c@entry=0x55dcac4d3880) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/quick/items/qquickitem.cpp:2991
#92 0x00007efc38795934 in QQuickItemPrivate::refWindow(QQuickWindow*) (this=this@entry=0x55dcabc1f4e0, c=c@entry=0x55dcac4d3880) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/quick/items/qquickitem.cpp:2984
#93 0x00007efc38796e6c in QQuickItem::setParentItem(QQuickItem*) (this=0x55dcabc1f3d0, parentItem=0x55dcac50a2f0) at /usr/src/debug/qtdeclarative-opensource-src-5.7.1/src/quick/items/qquickitem.cpp:2712
#94 0x00007efc3a905ed1 in PlasmaQuick::ContainmentViewPrivate::setContainment(Plasma::Containment*) (this=0x55dcac171a10, cont=<optimized out>) at /usr/src/debug/plasma-framework-5.33.0/src/plasmaquick/containmentview.cpp:141
#95 0x00007efc3a906589 in PlasmaQuick::ContainmentView::setContainment(Plasma::Containment*) (this=this@entry=0x55dcac4d3880, cont=<optimized out>) at /usr/src/debug/plasma-framework-5.33.0/src/plasmaquick/containmentview.cpp:258
#96 0x000055dcab80ab18 in ShellCorona::createWaitingPanels() (this=0x55dcabb91ea0) at /usr/src/debug/plasma-workspace-5.9.4/shell/shellcorona.cpp:1293
#97 0x00007efc34c94a56 in QtPrivate::QSlotObjectBase::call(QObject*, void**) (a=0x7fffe6c73280, r=0x55dcabb91ea0, this=<optimized out>) at ../../src/corelib/kernel/qobject_impl.h:101
#98 0x00007efc34c94a56 in QMetaObject::activate(QObject*, int, int, void**) (sender=sender@entry=0x55dcabb91f68, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3723
#99 0x00007efc34c94fc7 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) (sender=sender@entry=0x55dcabb91f68, m=m@entry=0x7efc34ea9da0 <QTimer::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3602
#100 0x00007efc34d04890 in QTimer::timeout(QTimer::QPrivateSignal) (this=this@entry=0x55dcabb91f68) at .moc/moc_qtimer.cpp:198
#101 0x00007efc34ca0c08 in QTimer::timerEvent(QTimerEvent*) (this=0x55dcabb91f68, e=<optimized out>) at kernel/qtimer.cpp:254
#102 0x00007efc34c9579b in QObject::event(QEvent*) (this=0x55dcabb91f68, e=<optimized out>) at kernel/qobject.cpp:1285
#103 0x00007efc35575ecc in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=<optimized out>, receiver=0x55dcabb91f68, e=0x7fffe6c735a0) at kernel/qapplication.cpp:3799
#104 0x00007efc3557d671 in QApplication::notify(QObject*, QEvent*) (this=0x7fffe6c73960, receiver=0x55dcabb91f68, e=0x7fffe6c735a0) at kernel/qapplication.cpp:3556
#105 0x00007efc34c6d6fa in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=0x55dcabb91f68, event=event@entry=0x7fffe6c735a0) at kernel/qcoreapplication.cpp:988
#106 0x00007efc34cbaceb in QCoreApplication::sendEvent(QObject*, QEvent*) (event=0x7fffe6c735a0, receiver=<optimized out>) at ../../src/corelib/kernel/qcoreapplication.h:231
#107 0x00007efc34cbaceb in QTimerInfoList::activateTimers() (this=0x55dcabb08e60) at kernel/qtimerinfo_unix.cpp:644
#108 0x00007efc34cbb241 in timerSourceDispatch(GSource*, GSourceFunc, gpointer) (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:182
#109 0x00007efc2ca3de52 in g_main_dispatch (context=0x55dcabb433f0) at gmain.c:3203
#110 0x00007efc2ca3de52 in g_main_context_dispatch (context=context@entry=0x55dcabb433f0) at gmain.c:3856
#111 0x00007efc2ca3e1d0 in g_main_context_iterate (context=context@entry=0x55dcabb433f0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3929
#112 0x00007efc2ca3e27c in g_main_context_iteration (context=0x55dcabb433f0, may_block=may_block@entry=1) at gmain.c:3990
#113 0x00007efc34cbb6cf in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x55dcabb3e5e0, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#114 0x00007efc34c6c68a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fffe6c737f0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#115 0x00007efc34c7418c in QCoreApplication::exec() () at kernel/qcoreapplication.cpp:1261
#116 0x000055dcab7ec192 in main(int, char**) (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/plasma-workspace-5.9.4/shell/main.cpp:166
Comment 1 David Edmundson 2017-04-13 22:28:58 UTC 
heh, despite the name - it's the standard task manager bug
Comment 2 court 2017-04-19 15:52:37 UTC 
I can confirm I am having this same issue with Fedora 25, Plasma 5.9.4 in Wayland. Particularly going Fonts -> Font Management
Comment 3 Christoph Feck 2017-04-26 23:34:47 UTC 

*** This bug has been marked as a duplicate of bug 378094 ***