Application: plasmashell (5.5.5)

Qt Version: 5.5.1
Operating System: Linux 4.4.0-22-generic x86_64
Distribution: Ubuntu 16.04 LTS

-- Information about the crash:
Nothing special to report. I had finished a Skype call and took no action for a few minutes. Then, Plasma crash report appeared. Apparently, I could continue working without any difference after the crash.

-- 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 0x7f9e4d4638c0 (LWP 1784))]

Thread 9 (Thread 0x7f9e38785700 (LWP 1788)):
#0  0x00007f9e47b79e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f9e4bc3ec62 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f9e4bc408d7 in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f9e3a8d3629 in QXcbEventReader::run (this=0x102d1c0) at qxcbconnection.cpp:1253
#4  0x00007f9e4826f84e in QThreadPrivate::start (arg=0x102d1c0) at thread/qthread_unix.cpp:331
#5  0x00007f9e4735c6fa in start_thread (arg=0x7f9e38785700) at pthread_create.c:333
#6  0x00007f9e47b85b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 8 (Thread 0x7f9e35f77700 (LWP 1808)):
#0  0x00007f9e48267dcf in QBasicAtomicOps<8>::testAndSetRelaxed<QMutexData*> (currentValue=<synthetic pointer>, newValue=0x0, expectedValue=0x1, _q_value=@0x10f5a48: 0x0) at ../../include/QtCore/../../src/corelib/arch/qatomic_x86.h:259
#1  QGenericAtomicOps<QBasicAtomicOps<8> >::testAndSetRelease<QMutexData*, QMutexData*> (currentValue=<synthetic pointer>, newValue=0x0, expectedValue=<optimized out>, _q_value=@0x10f5a48: 0x0) at ../../include/QtCore/../../src/corelib/thread/qgenericatomic.h:175
#2  QBasicAtomicPointer<QMutexData>::testAndSetRelease (currentValue=<synthetic pointer>, newValue=0x0, expectedValue=<optimized out>, this=this@entry=0x10f5a48) at ../../include/QtCore/../../src/corelib/thread/qbasicatomic.h:278
#3  QBasicMutex::fastTryUnlock (current=<synthetic pointer>, this=this@entry=0x10f5a48) at thread/qmutex.h:85
#4  QMutex::unlock (this=this@entry=0x10f5a48) at thread/qmutex.cpp:264
#5  0x00007f9e484a6031 in QMutexLocker::unlock (this=<synthetic pointer>) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:138
#6  QMutexLocker::~QMutexLocker (this=<synthetic pointer>, __in_chrg=<optimized out>) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:132
#7  QThreadData::canWaitLocked (this=0x10f5a20) at ../../include/QtCore/5.5.1/QtCore/private/../../../../../src/corelib/thread/qthread_p.h:240
#8  postEventSourcePrepare (s=0x7f9e280012d0, timeout=0x7f9e35f76b24) at kernel/qeventdispatcher_glib.cpp:254
#9  0x00007f9e4490e8ad in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007f9e4490f24b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007f9e4490f42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#12 0x00007f9e484a6a9b in QEventDispatcherGlib::processEvents (this=0x7f9e280008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#13 0x00007f9e4844ddea in QEventLoop::exec (this=this@entry=0x7f9e35f76ce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#14 0x00007f9e4826a8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#15 0x00007f9e4ab123c5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#16 0x00007f9e4826f84e in QThreadPrivate::start (arg=0x10fd840) at thread/qthread_unix.cpp:331
#17 0x00007f9e4735c6fa in start_thread (arg=0x7f9e35f77700) at pthread_create.c:333
#18 0x00007f9e47b85b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7f9e2deed700 (LWP 1816)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f9e2f482213 in ?? () from /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#2  0x00007f9e2f481937 in ?? () from /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#3  0x00007f9e4735c6fa in start_thread (arg=0x7f9e2deed700) at pthread_create.c:333
#4  0x00007f9e47b85b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7f9e22b87700 (LWP 1817)):
#0  0x00007fffbc5cd9a9 in ?? ()
#1  0x00007fffbc5cdcd5 in clock_gettime ()
#2  0x00007f9e47b93fb6 in __GI___clock_gettime (clock_id=1, tp=tp@entry=0x7f9e22b86a50) at ../sysdeps/unix/clock_gettime.c:115
#3  0x00007f9e4831fc16 in qt_clock_gettime (ts=0x7f9e22b86a50, clock=<optimized out>) at tools/qelapsedtimer_unix.cpp:105
#4  do_gettime (frac=<synthetic pointer>, sec=<synthetic pointer>) at tools/qelapsedtimer_unix.cpp:156
#5  qt_gettime () at tools/qelapsedtimer_unix.cpp:165
#6  0x00007f9e484a4529 in QTimerInfoList::updateCurrentTime (this=this@entry=0x7f9e1c002cd0) at kernel/qtimerinfo_unix.cpp:84
#7  0x00007f9e484a4a95 in QTimerInfoList::timerWait (this=0x7f9e1c002cd0, tm=...) at kernel/qtimerinfo_unix.cpp:381
#8  0x00007f9e484a5e7e in timerSourcePrepareHelper (timeout=0x7f9e22b86b24, src=<optimized out>) at kernel/qeventdispatcher_glib.cpp:127
#9  timerSourcePrepare (source=<optimized out>, timeout=0x7f9e22b86b24) at kernel/qeventdispatcher_glib.cpp:160
#10 0x00007f9e4490e8ad in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007f9e4490f24b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#12 0x00007f9e4490f42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#13 0x00007f9e484a6a9b in QEventDispatcherGlib::processEvents (this=0x7f9e1c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#14 0x00007f9e4844ddea in QEventLoop::exec (this=this@entry=0x7f9e22b86ce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#15 0x00007f9e4826a8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#16 0x00007f9e4ab123c5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#17 0x00007f9e4826f84e in QThreadPrivate::start (arg=0x13ce080) at thread/qthread_unix.cpp:331
#18 0x00007f9e4735c6fa in start_thread (arg=0x7f9e22b87700) at pthread_create.c:333
#19 0x00007f9e47b85b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f9e20d67700 (LWP 1830)):
#0  0x00007f9e47b79e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f9e4490f31c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f9e4490f42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f9e484a6a9b in QEventDispatcherGlib::processEvents (this=0x7f9e140008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f9e4844ddea in QEventLoop::exec (this=this@entry=0x7f9e20d66ce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f9e4826a8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f9e4ab123c5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f9e4826f84e in QThreadPrivate::start (arg=0x1490d70) at thread/qthread_unix.cpp:331
#8  0x00007f9e4735c6fa in start_thread (arg=0x7f9e20d67700) at pthread_create.c:333
#9  0x00007f9e47b85b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f9e1b3d8700 (LWP 1832)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f9e4ceb7bd4 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f9e4ceb7c19 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f9e4735c6fa in start_thread (arg=0x7f9e1b3d8700) at pthread_create.c:333
#4  0x00007f9e47b85b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f9e18a0f700 (LWP 1840)):
#0  0x00007f9e44953a64 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f9e4490ed49 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f9e4490f2c0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f9e4490f42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f9e484a6a9b in QEventDispatcherGlib::processEvents (this=0x7f9d900008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f9e4844ddea in QEventLoop::exec (this=this@entry=0x7f9e18a0ec90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f9e4826a8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f9e4b498ed6 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007f9e4826f84e in QThreadPrivate::start (arg=0x1590970) at thread/qthread_unix.cpp:331
#9  0x00007f9e4735c6fa in start_thread (arg=0x7f9e18a0f700) at pthread_create.c:333
#10 0x00007f9e47b85b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f9d8422c700 (LWP 1850)):
#0  0x00007f9e44953a64 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f9e4490e930 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f9e4490f24b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f9e4490f42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f9e484a6a9b in QEventDispatcherGlib::processEvents (this=0x7f9d7c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f9e4844ddea in QEventLoop::exec (this=this@entry=0x7f9d8422bcc0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f9e4826a8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f9d8670c7d7 in KCupsConnection::run() () from /usr/lib/x86_64-linux-gnu/libkcupslib.so
#8  0x00007f9e4826f84e in QThreadPrivate::start (arg=0x241b110) at thread/qthread_unix.cpp:331
#9  0x00007f9e4735c6fa in start_thread (arg=0x7f9d8422c700) at pthread_create.c:333
#10 0x00007f9e47b85b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f9e4d4638c0 (LWP 1784)):
[KCrash Handler]
#6  QWidget::windowHandle (this=0x0) at kernel/qwidget.cpp:2584
#7  0x00007f9d8cc3ec91 in Backend::<lambda()>::operator() (__closure=0x7fffbc437810) at /build/plasma-desktop-Bvo2Ad/plasma-desktop-5.5.5/applets/taskmanager/plugin/backend.cpp:351
#8  QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, Backend::itemContextMenu(QQuickItem*, QObject*)::<lambda()> >::call (arg=<optimized out>, f=...) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qobjectdefs_impl.h:495
#9  QtPrivate::Functor<Backend::itemContextMenu(QQuickItem*, QObject*)::<lambda()>, 0>::call<QtPrivate::List<>, void> (arg=<optimized out>, f=...) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qobjectdefs_impl.h:552
#10 QtPrivate::QFunctorSlotObject<Backend::itemContextMenu(QQuickItem*, QObject*)::<lambda()>, 0, QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase *, QObject *, void **, bool *) (which=<optimized out>, this_=<optimized out>, r=<optimized out>, a=<optimized out>, ret=<optimized out>) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qobject_impl.h:192
#11 0x00007f9e4848b5b8 in QtPrivate::QSlotObjectBase::call (a=0x7fffbc4378a0, r=<optimized out>, this=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:124
#12 QSingleShotTimer::timerEvent (this=0x34ac5e0) at kernel/qtimer.cpp:315
#13 0x00007f9e4847fe53 in QObject::event (this=0x34ac5e0, e=<optimized out>) at kernel/qobject.cpp:1261
#14 0x00007f9e48f5305c in QApplicationPrivate::notify_helper (this=this@entry=0x100d6a0, receiver=receiver@entry=0x34ac5e0, e=e@entry=0x7fffbc437b80) at kernel/qapplication.cpp:3716
#15 0x00007f9e48f58516 in QApplication::notify (this=0x7fffbc437f20, receiver=0x34ac5e0, e=0x7fffbc437b80) at kernel/qapplication.cpp:3499
#16 0x00007f9e4845062b in QCoreApplication::notifyInternal (this=0x7fffbc437f20, receiver=0x34ac5e0, event=event@entry=0x7fffbc437b80) at kernel/qcoreapplication.cpp:965
#17 0x00007f9e484a589d in QCoreApplication::sendEvent (event=0x7fffbc437b80, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:224
#18 QTimerInfoList::activateTimers (this=0x1059170) at kernel/qtimerinfo_unix.cpp:637
#19 0x00007f9e484a5da1 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:177
#20 0x00007f9e4490f127 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#21 0x00007f9e4490f380 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#22 0x00007f9e4490f42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007f9e484a6a7f in QEventDispatcherGlib::processEvents (this=0x1056ee0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#24 0x00007f9e4844ddea in QEventLoop::exec (this=this@entry=0x7fffbc437dc0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#25 0x00007f9e48455e8c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1229
#26 0x00007f9e48789c3c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1542
#27 0x00007f9e48f4f495 in QApplication::exec () at kernel/qapplication.cpp:2976
#28 0x0000000000432d4a in main (argc=2, argv=<optimized out>) at /build/plasma-workspace-kxRFE_/plasma-workspace-5.5.5.2/shell/main.cpp:181

Reported using DrKonqi