Application: plasmashell (5.4.3)

Qt Version: 5.5.1
Operating System: Linux 4.4.0-1-amd64 x86_64
Distribution: Debian GNU/Linux testing-updates (sid)

-- Information about the crash:
- What I was doing when the application crashed:
1- I started my computer, and a message about a missing file in an okular instance was shown.  (In the previous session I read this file, minimized okular and later decided to move the file to another folder, while still opened in okular. Later I turned the computer off.)
2 - I closed this particular okular window - it was minimized, I restored it and then closed. At the same time I had other okular sessions, with valid (existing) files shown
3 - Then I moved to another virtual desktop, via the mousewheel. Plasma crashed, but, before I clicked "restart" in the 'bug window' (where I an now, but my system is in Portuguese...) the plasma restarted automatically.
4 - THIS ERROR IS REPRODUCTIBLE: I went to other virtual desktops, via mousewheel, to check for some info about the english interface, and the fail occurred 2 or 3 times again - fortunately my bug description is still here! I changed to other desktops later, and the behaviour seens OK now.


- Unusual behavior I noticed:
Plasmashell crashed: the desktop paper disappeared and left a black backgrond; the panel (task bar) disappeared also (thus leaving more space at the bottom of screen, some windows took this extra space)

-- 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 0x7f411b0b6940 (LWP 2465))]

Thread 7 (Thread 0x7f4106120700 (LWP 2466)):
#0  0x00007f41157f7e4d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f41198aa382 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f41198abff7 in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f4107417789 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f4115edc7fe in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f4115000454 in start_thread (arg=0x7f4106120700) at pthread_create.c:334
#6  0x00007f4115800ecd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7f40ff5ef700 (LWP 2489)):
#0  0x00007f41157f3e2d in read () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f41125e66f0 in g_wakeup_acknowledge (__nbytes=16, __buf=0x7f40ff5eea60, __fd=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/unistd.h:44
#2  0x00007f41125e66f0 in g_wakeup_acknowledge (wakeup=0x7f41000015b0) at /build/glib2.0-2CrUwg/glib2.0-2.48.0/./glib/gwakeup.c:210
#3  0x00007f41125a2e14 in g_main_context_check (context=context@entry=0x7f40f8000990, max_priority=2147483647, fds=fds@entry=0x7f40f8003070, n_fds=n_fds@entry=1) at /build/glib2.0-2CrUwg/glib2.0-2.48.0/./glib/gmain.c:3632
#4  0x00007f41125a32d0 in g_main_context_iterate (context=context@entry=0x7f40f8000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-2CrUwg/glib2.0-2.48.0/./glib/gmain.c:3837
#5  0x00007f41125a343c in g_main_context_iteration (context=0x7f40f8000990, may_block=1) at /build/glib2.0-2CrUwg/glib2.0-2.48.0/./glib/gmain.c:3901
#6  0x00007f4116113a5b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f41160bad6a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f4115ed7854 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f411876a105 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00007f4115edc7fe in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007f4115000454 in start_thread (arg=0x7f40ff5ef700) at pthread_create.c:334
#12 0x00007f4115800ecd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f40f4ded700 (LWP 2493)):
#0  0x00007f4115ed495a in QMutex::lock() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#1  0x00007f4116112fdf in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f41125a28bd in g_main_context_prepare (context=context@entry=0x7f40f0000990, priority=priority@entry=0x7f40f4decb30) at /build/glib2.0-2CrUwg/glib2.0-2.48.0/./glib/gmain.c:3442
#3  0x00007f41125a325b in g_main_context_iterate (context=context@entry=0x7f40f0000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-2CrUwg/glib2.0-2.48.0/./glib/gmain.c:3820
#4  0x00007f41125a343c in g_main_context_iteration (context=0x7f40f0000990, may_block=1) at /build/glib2.0-2CrUwg/glib2.0-2.48.0/./glib/gmain.c:3901
#5  0x00007f4116113a5b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f41160bad6a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f4115ed7854 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f411876a105 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f4115edc7fe in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f4115000454 in start_thread (arg=0x7f40f4ded700) at pthread_create.c:334
#11 0x00007f4115800ecd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f40eed9d700 (LWP 3103)):
#0  0x00007f41157f7e4d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f41125a332c in g_main_context_iterate (priority=2147483647, n_fds=1, fds=0x7f40e8003070, timeout=<optimized out>, context=0x7f40e8000990) at /build/glib2.0-2CrUwg/glib2.0-2.48.0/./glib/gmain.c:4135
#2  0x00007f41125a332c in g_main_context_iterate (context=context@entry=0x7f40e8000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-2CrUwg/glib2.0-2.48.0/./glib/gmain.c:3835
#3  0x00007f41125a343c in g_main_context_iteration (context=0x7f40e8000990, may_block=1) at /build/glib2.0-2CrUwg/glib2.0-2.48.0/./glib/gmain.c:3901
#4  0x00007f4116113a5b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f41160bad6a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f4115ed7854 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f411876a105 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f4115edc7fe in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f4115000454 in start_thread (arg=0x7f40eed9d700) at pthread_create.c:334
#10 0x00007f4115800ecd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f40e77bd700 (LWP 3205)):
#0  0x00007f411500604f in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f411ab171c4 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f411ab17209 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f4115000454 in start_thread (arg=0x7f40e77bd700) at pthread_create.c:334
#4  0x00007f4115800ecd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f405e43f700 (LWP 3221)):
#0  0x00007f41157f7e4d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f41125a332c in g_main_context_iterate (priority=2147483647, n_fds=1, fds=0x7f4050002f20, timeout=<optimized out>, context=0x7f4050000990) at /build/glib2.0-2CrUwg/glib2.0-2.48.0/./glib/gmain.c:4135
#2  0x00007f41125a332c in g_main_context_iterate (context=context@entry=0x7f4050000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-2CrUwg/glib2.0-2.48.0/./glib/gmain.c:3835
#3  0x00007f41125a343c in g_main_context_iteration (context=0x7f4050000990, may_block=1) at /build/glib2.0-2CrUwg/glib2.0-2.48.0/./glib/gmain.c:3901
#4  0x00007f4116113a5b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f41160bad6a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f4115ed7854 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f41190f2136 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007f4115edc7fe in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f4115000454 in start_thread (arg=0x7f405e43f700) at pthread_create.c:334
#10 0x00007f4115800ecd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f411b0b6940 (LWP 2465)):
[KCrash Handler]
#6  0x00007f411853c358 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f41187ab97a in QQmlDelegateModel::_q_itemsChanged(int, int, QVector<int> const&) () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f41187d304c in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f41187d3838 in QQmlDelegateModel::qt_metacall(QMetaObject::Call, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00007f41160ec140 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007f411616809c in QAbstractItemModel::dataChanged(QModelIndex const&, QModelIndex const&, QVector<int> const&) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007f405d605884 in  () at /usr/lib/x86_64-linux-gnu/libtaskmanager.so.5
#13 0x00007f405d606b07 in  () at /usr/lib/x86_64-linux-gnu/libtaskmanager.so.5
#14 0x00007f41160ebf8a in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007f405d60ea28 in TaskManager::AbstractGroupableItem::changed(QFlags<TaskManager::TaskChange>) () at /usr/lib/x86_64-linux-gnu/libtaskmanager.so.5
#16 0x00007f405d5fbf70 in  () at /usr/lib/x86_64-linux-gnu/libtaskmanager.so.5
#17 0x00007f41160ebf8a in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007f405d60ec18 in TaskManager::Task::changed(QFlags<TaskManager::TaskChange>) () at /usr/lib/x86_64-linux-gnu/libtaskmanager.so.5
#19 0x00007f405d5edfdb in TaskManager::Task::setActive(bool) () at /usr/lib/x86_64-linux-gnu/libtaskmanager.so.5
#20 0x00007f405d601d4c in TaskManager::TaskManager::activeWindowChanged(unsigned long long) () at /usr/lib/x86_64-linux-gnu/libtaskmanager.so.5
#21 0x00007f405d604037 in  () at /usr/lib/x86_64-linux-gnu/libtaskmanager.so.5
#22 0x00007f41160ebf8a in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#23 0x00007f4118284c62 in KWindowSystem::activeWindowChanged(unsigned long long) () at /usr/lib/x86_64-linux-gnu/libKF5WindowSystem.so.5
#24 0x00007f41044fc29b in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/kf5/org.kde.kwindowsystem.platforms/KF5WindowSystemX11Plugin.so
#25 0x00007f41160b9f1f in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007f410741b204 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#27 0x00007f410741bfb3 in QXcbConnection::processXcbEvents() () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#28 0x00007f41160ece61 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#29 0x00007f4116bbfffc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#30 0x00007f4116bc54b6 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#31 0x00007f41160bd5ab in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#32 0x00007f41160bf9a6 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#33 0x00007f4116113633 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#34 0x00007f41125a3137 in g_main_context_dispatch (context=0x7f41000016f0) at /build/glib2.0-2CrUwg/glib2.0-2.48.0/./glib/gmain.c:3154
#35 0x00007f41125a3137 in g_main_context_dispatch (context=context@entry=0x7f41000016f0) at /build/glib2.0-2CrUwg/glib2.0-2.48.0/./glib/gmain.c:3769
#36 0x00007f41125a3390 in g_main_context_iterate (context=context@entry=0x7f41000016f0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-2CrUwg/glib2.0-2.48.0/./glib/gmain.c:3840
#37 0x00007f41125a343c in g_main_context_iteration (context=0x7f41000016f0, may_block=1) at /build/glib2.0-2CrUwg/glib2.0-2.48.0/./glib/gmain.c:3901
#38 0x00007f4116113a3f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#39 0x00007f41160bad6a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#40 0x00007f41160c2e0c in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#41 0x0000000000431b03 in main ()

Reported using DrKonqi