Bug 322290

Application: plasma-desktop (4.10.5)
KDE Platform Version: 4.10.5
Qt Version: 4.8.3
Operating System: Linux 3.5.0-36-generic x86_64
Distribution: Ubuntu 12.10

-- Information about the crash:
- What I was doing when the application crashed:

I had VLC open and was using the Window Menubar plasma widget.

- Unusual behavior I noticed:

The Menubar generally works, but sometimes was displaying a tiny dot instead of the drop-down menu in Firefox and Thunderbird. Additionally, the context menu (right click) would either not appear or would disappear immediately after disappearing even when using the context menu key on the keyboard. Dragging hyperlinks in Firefox would also not work when exhibiting this behavior. I only mention this because it may be related to the bug.

I have the Catalyst Control Center installed with the proprietary driver. I have OpenGl and Desktop Effects enabled. Plasma Desktop does not appear to crash more or less often with OpenGl enabled or using the proprietary driver.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f9b90f33780 (LWP 2268))]

Thread 9 (Thread 0x7f9b71f1c700 (LWP 2273)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f9b8a462987 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007f9b8a4629b9 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007f9b84b0ce9a in start_thread (arg=0x7f9b71f1c700) at pthread_create.c:308
#4  0x00007f9b9081fccd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 8 (Thread 0x7f9aebfff700 (LWP 2276)):
#0  0x00007f9b908128cd in read () at ../sysdeps/unix/syscall-template.S:82
#1  0x00007f9b8444a15f in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f9b8440d914 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f9b8440dd22 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f9b8440dea4 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f9b8d40bc46 in QEventDispatcherGlib::processEvents (this=0x7f9ae40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#6  0x00007f9b8d3dc2ef in QEventLoop::processEvents (this=this@entry=0x7f9aebffedd0, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007f9b8d3dc578 in QEventLoop::exec (this=0x7f9aebffedd0, flags=...) at kernel/qeventloop.cpp:204
#8  0x00007f9b8d2ddb40 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#9  0x00007f9b8d3bc9df in QInotifyFileSystemWatcherEngine::run (this=0x1c69780) at io/qfilesystemwatcher_inotify.cpp:248
#10 0x00007f9b8d2e0b1c in QThreadPrivate::start (arg=0x1c69780) at thread/qthread_unix.cpp:338
#11 0x00007f9b84b0ce9a in start_thread (arg=0x7f9aebfff700) at pthread_create.c:308
#12 0x00007f9b9081fccd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#13 0x0000000000000000 in ?? ()

Thread 7 (Thread 0x7f9aea5aa700 (LWP 2277)):
#0  0x00007f9b90814313 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f9b8440dd84 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f9b8440dea4 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f9b8d40bc46 in QEventDispatcherGlib::processEvents (this=0x7f9ad80008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#4  0x00007f9b8d3dc2ef in QEventLoop::processEvents (this=this@entry=0x7f9aea5a9dd0, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f9b8d3dc578 in QEventLoop::exec (this=0x7f9aea5a9dd0, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007f9b8d2ddb40 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#7  0x00007f9b8d3bc9df in QInotifyFileSystemWatcherEngine::run (this=0x1f89a80) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f9b8d2e0b1c in QThreadPrivate::start (arg=0x1f89a80) at thread/qthread_unix.cpp:338
#9  0x00007f9b84b0ce9a in start_thread (arg=0x7f9aea5aa700) at pthread_create.c:308
#10 0x00007f9b9081fccd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 6 (Thread 0x7f9ad6ea5700 (LWP 3921)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f9b8d2e107b in wait (time=18446744073709551615, this=0x1e10dc0) at thread/qwaitcondition_unix.cpp:86
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x1e0cc40, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
#3  0x00007f9b896e50e1 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x1ecdbd0, th=0x401e710) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007f9b896e792b in ThreadWeaver::WorkingHardState::applyForWork (this=0x1cac660, th=0x401e710) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007f9b896e679f in ThreadWeaver::ThreadRunHelper::run (this=this@entry=0x7f9ad6ea4e00, parent=0x1ecdbd0, th=th@entry=0x401e710) at ../../../threadweaver/Weaver/Thread.cpp:87
#6  0x00007f9b896e682b in ThreadWeaver::Thread::run (this=0x401e710) at ../../../threadweaver/Weaver/Thread.cpp:142
#7  0x00007f9b8d2e0b1c in QThreadPrivate::start (arg=0x401e710) at thread/qthread_unix.cpp:338
#8  0x00007f9b84b0ce9a in start_thread (arg=0x7f9ad6ea5700) at pthread_create.c:308
#9  0x00007f9b9081fccd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#10 0x0000000000000000 in ?? ()

Thread 5 (Thread 0x7f9acf463700 (LWP 3922)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f9b8d2e107b in wait (time=18446744073709551615, this=0x1e10dc0) at thread/qwaitcondition_unix.cpp:86
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x1e0cc40, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
#3  0x00007f9b896e50e1 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x1ecdbd0, th=0x3efa270) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007f9b896e792b in ThreadWeaver::WorkingHardState::applyForWork (this=0x1cac660, th=0x3efa270) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007f9b896e679f in ThreadWeaver::ThreadRunHelper::run (this=this@entry=0x7f9acf462e00, parent=0x1ecdbd0, th=th@entry=0x3efa270) at ../../../threadweaver/Weaver/Thread.cpp:87
#6  0x00007f9b896e682b in ThreadWeaver::Thread::run (this=0x3efa270) at ../../../threadweaver/Weaver/Thread.cpp:142
#7  0x00007f9b8d2e0b1c in QThreadPrivate::start (arg=0x3efa270) at thread/qthread_unix.cpp:338
#8  0x00007f9b84b0ce9a in start_thread (arg=0x7f9acf463700) at pthread_create.c:308
#9  0x00007f9b9081fccd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#10 0x0000000000000000 in ?? ()

Thread 4 (Thread 0x7f9ace460700 (LWP 3923)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f9b8d2e107b in wait (time=18446744073709551615, this=0x1e10dc0) at thread/qwaitcondition_unix.cpp:86
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x1e0cc40, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
#3  0x00007f9b896e50e1 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x1ecdbd0, th=0x41370c0) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007f9b896e792b in ThreadWeaver::WorkingHardState::applyForWork (this=0x1cac660, th=0x41370c0) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007f9b896e679f in ThreadWeaver::ThreadRunHelper::run (this=this@entry=0x7f9ace45fe00, parent=0x1ecdbd0, th=th@entry=0x41370c0) at ../../../threadweaver/Weaver/Thread.cpp:87
#6  0x00007f9b896e682b in ThreadWeaver::Thread::run (this=0x41370c0) at ../../../threadweaver/Weaver/Thread.cpp:142
#7  0x00007f9b8d2e0b1c in QThreadPrivate::start (arg=0x41370c0) at thread/qthread_unix.cpp:338
#8  0x00007f9b84b0ce9a in start_thread (arg=0x7f9ace460700) at pthread_create.c:308
#9  0x00007f9b9081fccd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#10 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f9ad4cec700 (LWP 3924)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f9b8d2e107b in wait (time=18446744073709551615, this=0x1e10dc0) at thread/qwaitcondition_unix.cpp:86
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x1e0cc40, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
#3  0x00007f9b896e50e1 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x1ecdbd0, th=0x4322680) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007f9b896e792b in ThreadWeaver::WorkingHardState::applyForWork (this=0x1cac660, th=0x4322680) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007f9b896e679f in ThreadWeaver::ThreadRunHelper::run (this=this@entry=0x7f9ad4cebe00, parent=0x1ecdbd0, th=th@entry=0x4322680) at ../../../threadweaver/Weaver/Thread.cpp:87
#6  0x00007f9b896e682b in ThreadWeaver::Thread::run (this=0x4322680) at ../../../threadweaver/Weaver/Thread.cpp:142
#7  0x00007f9b8d2e0b1c in QThreadPrivate::start (arg=0x4322680) at thread/qthread_unix.cpp:338
#8  0x00007f9b84b0ce9a in start_thread (arg=0x7f9ad4cec700) at pthread_create.c:308
#9  0x00007f9b9081fccd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#10 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f9ac2dc9700 (LWP 3925)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f9b8d2e107b in wait (time=18446744073709551615, this=0x1e10dc0) at thread/qwaitcondition_unix.cpp:86
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x1e0cc40, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
#3  0x00007f9b896e50e1 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x1ecdbd0, th=0x3cfd640) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007f9b896e792b in ThreadWeaver::WorkingHardState::applyForWork (this=0x1cac660, th=0x3cfd640) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007f9b896e679f in ThreadWeaver::ThreadRunHelper::run (this=this@entry=0x7f9ac2dc8e00, parent=0x1ecdbd0, th=th@entry=0x3cfd640) at ../../../threadweaver/Weaver/Thread.cpp:87
#6  0x00007f9b896e682b in ThreadWeaver::Thread::run (this=0x3cfd640) at ../../../threadweaver/Weaver/Thread.cpp:142
#7  0x00007f9b8d2e0b1c in QThreadPrivate::start (arg=0x3cfd640) at thread/qthread_unix.cpp:338
#8  0x00007f9b84b0ce9a in start_thread (arg=0x7f9ac2dc9700) at pthread_create.c:308
#9  0x00007f9b9081fccd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#10 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f9b90f33780 (LWP 2268)):
[KCrash Handler]
#6  ref (this=0x0) at ../../include/QtCore/../../src/corelib/arch/qatomic_x86_64.h:121
#7  QList (l=..., this=0x7fffc2968d10) at ../../include/QtCore/../../src/corelib/tools/qlist.h:122
#8  QWidget::actions (this=0x4b7c6f0) at kernel/qwidget.cpp:3342
#9  0x00007f9b7328f0fa in ?? () from /usr/lib/kde4/plasma_applet_menubar.so
#10 0x00007f9b7328ec14 in ?? () from /usr/lib/kde4/plasma_applet_menubar.so
#11 0x00007f9b8d3f2f8f in QMetaObject::activate (sender=0x50b8dd0, m=<optimized out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3547
#12 0x00007f9b8cbc08d0 in QMenu::popup (this=0x50b8dd0, p=..., atAction=0x0) at widgets/qmenu.cpp:1832
#13 0x00007f9b732915ae in ?? () from /usr/lib/kde4/plasma_applet_menubar.so
#14 0x00007f9b73291223 in ?? () from /usr/lib/kde4/plasma_applet_menubar.so
#15 0x00007f9b7329069f in ?? () from /usr/lib/kde4/plasma_applet_menubar.so
#16 0x00007f9b8d3f2f8f in QMetaObject::activate (sender=0x4887050, m=<optimized out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3547
#17 0x00007f9b904126e5 in qt_static_metacall (_a=<optimized out>, _id=<optimized out>, _o=<optimized out>, _c=<optimized out>) at ./toolbutton.moc:80
#18 Plasma::ToolButton::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at ./toolbutton.moc:74
#19 0x00007f9b8d3f2f8f in QMetaObject::activate (sender=0x5679ff0, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7fffc29693d0) at kernel/qobject.cpp:3547
#20 0x00007f9b8cdef422 in QAbstractButton::clicked (this=<optimized out>, _t1=false) at .moc/release-shared/moc_qabstractbutton.cpp:220
#21 0x00007f9b8cb42d2e in QAbstractButtonPrivate::emitClicked (this=this@entry=0x567b170) at widgets/qabstractbutton.cpp:548
#22 0x00007f9b8cb43560 in QAbstractButtonPrivate::click (this=this@entry=0x567b170) at widgets/qabstractbutton.cpp:541
#23 0x00007f9b8cb437cc in QAbstractButton::mouseReleaseEvent (this=0x5679ff0, e=0x47421a0) at widgets/qabstractbutton.cpp:1123
#24 0x00007f9b8cbfd99a in QToolButton::mouseReleaseEvent (this=<optimized out>, e=<optimized out>) at widgets/qtoolbutton.cpp:718
#25 0x00007f9b8c7d4850 in QWidget::event (this=0x5679ff0, event=0x47421a0) at kernel/qwidget.cpp:8371
#26 0x00007f9b8c784e9c in QApplicationPrivate::notify_helper (this=this@entry=0x148d6d0, receiver=receiver@entry=0x5679ff0, e=e@entry=0x47421a0) at kernel/qapplication.cpp:4562
#27 0x00007f9b8c789b6b in QApplication::notify (this=<optimized out>, receiver=0x5679ff0, e=0x47421a0) at kernel/qapplication.cpp:4105
#28 0x00007f9b8e097186 in KApplication::notify (this=0x14726d0, receiver=0x5679ff0, event=0x47421a0) at ../../kdeui/kernel/kapplication.cpp:311
#29 0x00007f9b8d3dd59e in QCoreApplication::notifyInternal (this=0x14726d0, receiver=0x5679ff0, event=0x47421a0) at kernel/qcoreapplication.cpp:915
#30 0x00007f9b8c785cd3 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#31 QApplicationPrivate::sendMouseEvent (receiver=0x5679ff0, event=0x47421a0, alienWidget=0x0, nativeWidget=0x5679ff0, buttonDown=0x7fffc2969c48, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:3173
#32 0x00007f9b8cd65e24 in QGraphicsProxyWidgetPrivate::sendWidgetMouseEvent (this=0x4648940, event=0x7fffc296a3d0) at graphicsview/qgraphicsproxywidget.cpp:283
#33 0x00007f9b8cd45589 in QGraphicsItem::sceneEvent (this=0x4887060, event=0x7fffc296a3d0) at graphicsview/qgraphicsitem.cpp:6741
#34 0x00007f9b8cd6e950 in sendMouseEvent (mouseEvent=0x7fffc296a3d0, this=0x1497b80) at graphicsview/qgraphicsscene.cpp:1295
#35 QGraphicsScenePrivate::sendMouseEvent (this=0x1497b80, mouseEvent=0x7fffc296a3d0) at graphicsview/qgraphicsscene.cpp:1274
#36 0x00007f9b8cd6f345 in QGraphicsScene::mouseReleaseEvent (this=<optimized out>, mouseEvent=0x7fffc296a3d0) at graphicsview/qgraphicsscene.cpp:4128
#37 0x00007f9b8cd8210c in QGraphicsScene::event (this=0x16d4a90, event=0x7fffc296a3d0) at graphicsview/qgraphicsscene.cpp:3458
#38 0x00007f9b8c784e9c in QApplicationPrivate::notify_helper (this=this@entry=0x148d6d0, receiver=receiver@entry=0x16d4a90, e=e@entry=0x7fffc296a3d0) at kernel/qapplication.cpp:4562
#39 0x00007f9b8c78930a in QApplication::notify (this=0x14726d0, receiver=0x16d4a90, e=0x7fffc296a3d0) at kernel/qapplication.cpp:4423
#40 0x00007f9b8e097186 in KApplication::notify (this=0x14726d0, receiver=0x16d4a90, event=0x7fffc296a3d0) at ../../kdeui/kernel/kapplication.cpp:311
#41 0x00007f9b8d3dd59e in QCoreApplication::notifyInternal (this=0x14726d0, receiver=0x16d4a90, event=0x7fffc296a3d0) at kernel/qcoreapplication.cpp:915
#42 0x00007f9b8cd984e1 in QGraphicsView::mouseReleaseEvent (this=0x19b0f30, event=0x7fffc296ad00) at graphicsview/qgraphicsview.cpp:3338
#43 0x00007f9b8c7d4850 in QWidget::event (this=0x19b0f30, event=0x7fffc296ad00) at kernel/qwidget.cpp:8371
#44 0x00007f9b8cb83b66 in QFrame::event (this=0x19b0f30, e=0x7fffc296ad00) at widgets/qframe.cpp:557
#45 0x00007f9b8cd9b95b in QGraphicsView::viewportEvent (this=0x19b0f30, event=0x7fffc296ad00) at graphicsview/qgraphicsview.cpp:2866
#46 0x00007f9b8d3dd706 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=<optimized out>, receiver=0x2c41130, event=0x7fffc296ad00) at kernel/qcoreapplication.cpp:1025
#47 0x00007f9b8c784e6c in QApplicationPrivate::notify_helper (this=this@entry=0x148d6d0, receiver=receiver@entry=0x2c41130, e=e@entry=0x7fffc296ad00) at kernel/qapplication.cpp:4558
#48 0x00007f9b8c789b6b in QApplication::notify (this=<optimized out>, receiver=0x2c41130, e=0x7fffc296ad00) at kernel/qapplication.cpp:4105
#49 0x00007f9b8e097186 in KApplication::notify (this=0x14726d0, receiver=0x2c41130, event=0x7fffc296ad00) at ../../kdeui/kernel/kapplication.cpp:311
#50 0x00007f9b8d3dd59e in QCoreApplication::notifyInternal (this=0x14726d0, receiver=0x2c41130, event=0x7fffc296ad00) at kernel/qcoreapplication.cpp:915
#51 0x00007f9b8c785cd3 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#52 QApplicationPrivate::sendMouseEvent (receiver=0x2c41130, event=0x7fffc296ad00, alienWidget=0x2c41130, nativeWidget=0x19b0f30, buttonDown=0x7f9b8d261308 <qt_button_down>, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:3173
#53 0x00007f9b8c803554 in QETWidget::translateMouseEvent (this=this@entry=0x19b0f30, event=event@entry=0x7fffc296b480) at kernel/qapplication_x11.cpp:4622
#54 0x00007f9b8c80244f in QApplication::x11ProcessEvent (this=0x14726d0, event=0x7fffc296b480) at kernel/qapplication_x11.cpp:3737
#55 0x00007f9b8c829fa2 in x11EventSourceDispatch (s=0x1490570, callback=0x0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#56 0x00007f9b8440dab5 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#57 0x00007f9b8440dde8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#58 0x00007f9b8440dea4 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#59 0x00007f9b8d40bc26 in QEventDispatcherGlib::processEvents (this=0x140fad0, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#60 0x00007f9b8c829c1e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#61 0x00007f9b8d3dc2ef in QEventLoop::processEvents (this=this@entry=0x7fffc296b850, flags=...) at kernel/qeventloop.cpp:149
#62 0x00007f9b8d3dc578 in QEventLoop::exec (this=0x7fffc296b850, flags=...) at kernel/qeventloop.cpp:204
#63 0x00007f9b8d3e1738 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1187
#64 0x00007f9b90b28461 in kdemain (argc=1, argv=0x7fffc296bb48) at ../../../../plasma/desktop/shell/main.cpp:126
#65 0x00007f9b9074d76d in __libc_start_main (main=0x4006a0 <main(int, char**)>, argc=1, ubp_av=0x7fffc296bb48, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffc296bb38) at libc-start.c:226
#66 0x00000000004006d1 in _start ()

Reported using DrKonqi