Bug 328223

Summary: Plamsa crashes when hovering over window entries after applying activation of "Highlight windows" in Task Manager Settings
Product: [Unmaintained] plasma4 Reporter: Elias Vanderstuyft <Elias.vds>
Component: generalAssignee: Plasma Bugs List <plasma-bugs-null>
Status: RESOLVED DUPLICATE    
Severity: crash Keywords: drkonqi
Priority: NOR    
Version First Reported In: 4.11.3   
Target Milestone: ---   
Platform: Fedora RPMs   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Elias Vanderstuyft 2013-11-29 17:56:02 UTC 
Application: plasma-desktop (4.11.3)
KDE Platform Version: 4.11.3
Qt Version: 4.8.5
Operating System: Linux 3.11.7-200.fc19.x86_64 x86_64
Distribution (Platform): Fedora RPMs

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

(Firefox was running)

1. Right-click on the Task Manager and open "Task Manager Settings".
2. Enable "Highlight windows".
3. Click "Apply".
4. Hover over all task entries (2 in my case: Firefox and Task Manager Settings)

I was also able to reproduce this by doing the same (not always), except this time I disabled the "Highlight windows" option.

The crash does not seem to be reproducible.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
81	T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
[Current thread is 1 (Thread 0x7f84038d78c0 (LWP 1795))]

Thread 9 (Thread 0x7f83f6996700 (LWP 1798)):
#0  0x0000003121486f6a in g_mutex_get_impl (mutex=0x1613ee0) at gthread-posix.c:121
#1  0x0000003121487219 in g_mutex_lock (mutex=mutex@entry=0x1613ee0) at gthread-posix.c:210
#2  0x00000031214480ca in g_main_context_poll (priority=2147483647, n_fds=3, fds=0x7f83f00010c0, timeout=-1, context=0x1613ee0) at gmain.c:3990
#3  g_main_context_iterate (context=0x1613ee0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3696
#4  0x000000312144854a in g_main_loop_run (loop=0x1613e70) at gmain.c:3895
#5  0x00000031224c6db6 in gdbus_shared_thread_func (user_data=0x1613eb0) at gdbusprivate.c:278
#6  0x000000312146c165 in g_thread_proxy (data=0x160ea80) at gthread.c:798
#7  0x0000003fb4207c53 in start_thread (arg=0x7f83f6996700) at pthread_create.c:308
#8  0x0000003fb3af5dbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 8 (Thread 0x7f83e54a5700 (LWP 1799)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x000000312b5860bb in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x312b883f00 <QTWTF::pageheap_memory>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#2  0x000000312b5860f9 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=<optimized out>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#3  0x0000003fb4207c53 in start_thread (arg=0x7f83e54a5700) at pthread_create.c:308
#4  0x0000003fb3af5dbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 7 (Thread 0x7f8362e1f700 (LWP 1800)):
#0  0x0000003121486f6a in g_mutex_get_impl (mutex=0x7f835c0009a0) at gthread-posix.c:121
#1  0x0000003121487219 in g_mutex_lock (mutex=mutex@entry=0x7f835c0009a0) at gthread-posix.c:210
#2  0x0000003121447657 in g_main_context_prepare (context=context@entry=0x7f835c0009a0, priority=priority@entry=0x7f8362e1eba8) at gmain.c:3268
#3  0x0000003121448003 in g_main_context_iterate (context=context@entry=0x7f835c0009a0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3681
#4  0x00000031214481ec in g_main_context_iteration (context=0x7f835c0009a0, may_block=1) at gmain.c:3762
#5  0x00000031229a7166 in QEventDispatcherGlib::processEvents (this=0x7f835c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:427
#6  0x0000003122978ecf in QEventLoop::processEvents (this=this@entry=0x7f8362e1ece0, flags=...) at kernel/qeventloop.cpp:149
#7  0x00000031229791c5 in QEventLoop::exec (this=this@entry=0x7f8362e1ece0, flags=...) at kernel/qeventloop.cpp:204
#8  0x000000312287866f in QThread::exec (this=this@entry=0x2227b10) at thread/qthread.cpp:536
#9  0x000000312295a733 in QInotifyFileSystemWatcherEngine::run (this=0x2227b10) at io/qfilesystemwatcher_inotify.cpp:256
#10 0x000000312287ad0f in QThreadPrivate::start (arg=0x2227b10) at thread/qthread_unix.cpp:338
#11 0x0000003fb4207c53 in start_thread (arg=0x7f8362e1f700) at pthread_create.c:308
#12 0x0000003fb3af5dbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 6 (Thread 0x7f83ea86c700 (LWP 2663)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x000000312287b1e6 in wait (time=18446744073709551615, this=0x22eca10) at thread/qwaitcondition_unix.cpp:86
#2  QWaitCondition::wait (this=this@entry=0x2387578, mutex=0x22b8cb0, time=time@entry=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
#3  0x000000312e20a85c in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x2387550, th=0x3c2b3c0) at /usr/src/debug/kdelibs-4.11.3/threadweaver/Weaver/WeaverImpl.cpp:370
#4  0x000000312e20d2f3 in ThreadWeaver::WorkingHardState::applyForWork (this=0x22add10, th=0x3c2b3c0, previous=0x3c282f0) at /usr/src/debug/kdelibs-4.11.3/threadweaver/Weaver/WorkingHardState.cpp:68
#5  0x000000312e20c00f in ThreadWeaver::Thread::run (this=0x3c2b3c0) at /usr/src/debug/kdelibs-4.11.3/threadweaver/Weaver/Thread.cpp:98
#6  0x000000312287ad0f in QThreadPrivate::start (arg=0x3c2b3c0) at thread/qthread_unix.cpp:338
#7  0x0000003fb4207c53 in start_thread (arg=0x7f83ea86c700) at pthread_create.c:308
#8  0x0000003fb3af5dbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 5 (Thread 0x7f83e81dc700 (LWP 2664)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x000000312287b1e6 in wait (time=18446744073709551615, this=0x22eca10) at thread/qwaitcondition_unix.cpp:86
#2  QWaitCondition::wait (this=this@entry=0x2387578, mutex=0x22b8cb0, time=time@entry=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
#3  0x000000312e20a85c in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x2387550, th=0x3233910) at /usr/src/debug/kdelibs-4.11.3/threadweaver/Weaver/WeaverImpl.cpp:370
#4  0x000000312e20d2f3 in ThreadWeaver::WorkingHardState::applyForWork (this=0x22add10, th=0x3233910, previous=0x3e43cc0) at /usr/src/debug/kdelibs-4.11.3/threadweaver/Weaver/WorkingHardState.cpp:68
#5  0x000000312e20c00f in ThreadWeaver::Thread::run (this=0x3233910) at /usr/src/debug/kdelibs-4.11.3/threadweaver/Weaver/Thread.cpp:98
#6  0x000000312287ad0f in QThreadPrivate::start (arg=0x3233910) at thread/qthread_unix.cpp:338
#7  0x0000003fb4207c53 in start_thread (arg=0x7f83e81dc700) at pthread_create.c:308
#8  0x0000003fb3af5dbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 4 (Thread 0x7f83e79db700 (LWP 2665)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x000000312287b1e6 in wait (time=18446744073709551615, this=0x22eca10) at thread/qwaitcondition_unix.cpp:86
#2  QWaitCondition::wait (this=this@entry=0x2387578, mutex=0x22b8cb0, time=time@entry=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
#3  0x000000312e20a85c in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x2387550, th=0x3c2b3e0) at /usr/src/debug/kdelibs-4.11.3/threadweaver/Weaver/WeaverImpl.cpp:370
#4  0x000000312e20d2f3 in ThreadWeaver::WorkingHardState::applyForWork (this=0x22add10, th=0x3c2b3e0, previous=0x3cafab0) at /usr/src/debug/kdelibs-4.11.3/threadweaver/Weaver/WorkingHardState.cpp:68
#5  0x000000312e20c00f in ThreadWeaver::Thread::run (this=0x3c2b3e0) at /usr/src/debug/kdelibs-4.11.3/threadweaver/Weaver/Thread.cpp:98
#6  0x000000312287ad0f in QThreadPrivate::start (arg=0x3c2b3e0) at thread/qthread_unix.cpp:338
#7  0x0000003fb4207c53 in start_thread (arg=0x7f83e79db700) at pthread_create.c:308
#8  0x0000003fb3af5dbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 3 (Thread 0x7f83e71da700 (LWP 2666)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x000000312287b1e6 in wait (time=18446744073709551615, this=0x22eca10) at thread/qwaitcondition_unix.cpp:86
#2  QWaitCondition::wait (this=this@entry=0x2387578, mutex=0x22b8cb0, time=time@entry=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
#3  0x000000312e20a85c in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x2387550, th=0x3c2b420) at /usr/src/debug/kdelibs-4.11.3/threadweaver/Weaver/WeaverImpl.cpp:370
#4  0x000000312e20d2f3 in ThreadWeaver::WorkingHardState::applyForWork (this=0x22add10, th=0x3c2b420, previous=0x0) at /usr/src/debug/kdelibs-4.11.3/threadweaver/Weaver/WorkingHardState.cpp:68
#5  0x000000312e20c00f in ThreadWeaver::Thread::run (this=0x3c2b420) at /usr/src/debug/kdelibs-4.11.3/threadweaver/Weaver/Thread.cpp:98
#6  0x000000312287ad0f in QThreadPrivate::start (arg=0x3c2b420) at thread/qthread_unix.cpp:338
#7  0x0000003fb4207c53 in start_thread (arg=0x7f83e71da700) at pthread_create.c:308
#8  0x0000003fb3af5dbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 2 (Thread 0x7f83e69d9700 (LWP 2667)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x000000312287b1e6 in wait (time=18446744073709551615, this=0x22eca10) at thread/qwaitcondition_unix.cpp:86
#2  QWaitCondition::wait (this=this@entry=0x2387578, mutex=0x22b8cb0, time=time@entry=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
#3  0x000000312e20a85c in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x2387550, th=0x3c5d240) at /usr/src/debug/kdelibs-4.11.3/threadweaver/Weaver/WeaverImpl.cpp:370
#4  0x000000312e20d2f3 in ThreadWeaver::WorkingHardState::applyForWork (this=0x22add10, th=0x3c5d240, previous=0x3cac2f0) at /usr/src/debug/kdelibs-4.11.3/threadweaver/Weaver/WorkingHardState.cpp:68
#5  0x000000312e20c00f in ThreadWeaver::Thread::run (this=0x3c5d240) at /usr/src/debug/kdelibs-4.11.3/threadweaver/Weaver/Thread.cpp:98
#6  0x000000312287ad0f in QThreadPrivate::start (arg=0x3c5d240) at thread/qthread_unix.cpp:338
#7  0x0000003fb4207c53 in start_thread (arg=0x7f83e69d9700) at pthread_create.c:308
#8  0x0000003fb3af5dbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 1 (Thread 0x7f84038d78c0 (LWP 1795)):
[KCrash Handler]
#6  0x0000003125c555f0 in vtable for KPushButton () from /lib64/libkdeui.so.5
#7  0x000000312298f094 in QObject::connect (sender=sender@entry=0x41aa6c0, signal=signal@entry=0x3132094aac "2destroyed(QObject*)", receiver=receiver@entry=0x1852120, method=method@entry=0x31320a6b47 "1onWidgetDestroyed(QObject*)", type=type@entry=Qt::AutoConnection) at kernel/qobject.cpp:2554
#8  0x0000003131fd5dcb in Plasma::ToolTipManager::registerWidget (this=this@entry=0x1852120, widget=widget@entry=0x41aa6c0) at /usr/src/debug/kdelibs-4.11.3/plasma/tooltipmanager.cpp:209
#9  0x0000003131fd5f2b in Plasma::ToolTipManager::setContent (this=0x1852120, widget=widget@entry=0x41aa6c0, data=...) at /usr/src/debug/kdelibs-4.11.3/plasma/tooltipmanager.cpp:235
#10 0x00007f83edf5637a in ToolTipProxy::updateToolTip (this=<optimized out>) at /usr/src/debug/kde-workspace-4.11.3/plasma/desktop/applets/tasks/support/tooltip.cpp:252
#11 0x000000312298df78 in QMetaObject::activate (sender=sender@entry=0x1f99f60, m=m@entry=0x7f83ee15bca0 <ToolTipProxy::staticMetaObject>, local_signal_index=local_signal_index@entry=5, argv=argv@entry=0x0) at kernel/qobject.cpp:3547
#12 0x00007f83edf568d7 in highlightWindowsChanged (this=0x1f99f60) at /usr/src/debug/kde-workspace-4.11.3/x86_64-redhat-linux-gnu/plasma/desktop/applets/tasks/tooltip.moc:209
#13 setHighlightWindows (highlight=<optimized out>, this=0x1f99f60) at /usr/src/debug/kde-workspace-4.11.3/plasma/desktop/applets/tasks/support/tooltip.cpp:193
#14 ToolTipProxy::qt_metacall (this=0x1f99f60, _c=QMetaObject::WriteProperty, _id=5, _a=0x7fff9fc8df90) at /usr/src/debug/kde-workspace-4.11.3/x86_64-redhat-linux-gnu/plasma/desktop/applets/tasks/tooltip.moc:156
#15 0x000000312d9a4769 in QDeclarativeVMEMetaObject::metaCall (this=0x1fa8240, c=QMetaObject::WriteProperty, _id=6, a=0x7fff9fc8df90) at qml/qdeclarativevmemetaobject.cpp:673
#16 0x000000312da18fce in QDeclarativeCompiledBindingsPrivate::run (this=this@entry=0x1fb2890, instrIndex=<optimized out>, context=0x1f9f460, error=error@entry=0x1fb1d60, scope=0x1f99f60, output=0x1f99f60, storeFlags=...) at qml/qdeclarativecompiledbindings.cpp:1540
#17 0x000000312da19cd7 in QDeclarativeCompiledBindingsPrivate::run (this=this@entry=0x1fb2890, binding=0x1fb1d20, flags=...) at qml/qdeclarativecompiledbindings.cpp:428
#18 0x000000312da19f30 in QDeclarativeCompiledBindings::qt_metacall (this=<optimized out>, c=<optimized out>, id=<optimized out>) at qml/qdeclarativecompiledbindings.cpp:380
#19 0x000000312298e172 in QMetaObject::activate (sender=0x1faa9e0, m=<optimized out>, local_signal_index=<optimized out>, argv=argv@entry=0x0) at kernel/qobject.cpp:3577
#20 0x000000312298e923 in QMetaObject::activate (sender=<optimized out>, signal_index=<optimized out>, argv=argv@entry=0x0) at kernel/qobject.cpp:3634
#21 0x000000312d9a4b0e in QDeclarativeVMEMetaObject::metaCall (this=0x1ea7a70, c=QMetaObject::WriteProperty, _id=<optimized out>, a=0x7fff9fc8e670) at qml/qdeclarativevmemetaobject.cpp:564
#22 0x0000003122983c96 in QMetaProperty::write (this=this@entry=0x7fff9fc8e6f0, object=object@entry=0x1faa9e0, value=...) at kernel/qmetaobject.cpp:2364
#23 0x0000003122993acf in QObject::setProperty (this=0x1faa9e0, name=name@entry=0x7f83edf56d73 "highlightWindows", value=...) at kernel/qobject.cpp:3736
#24 0x00007f83edf50375 in Tasks::configChanged (this=0x1aaaf10) at /usr/src/debug/kde-workspace-4.11.3/plasma/desktop/applets/tasks/tasks.cpp:454
#25 0x0000003131f15288 in Plasma::AppletPrivate::configDialogFinished (this=0x1aab7a0) at /usr/src/debug/kdelibs-4.11.3/plasma/applet.cpp:2152
#26 0x0000003131f156c9 in Plasma::Applet::qt_static_metacall (_o=0x41aa6c0, _id=839469740, _a=0x3122a56c26, _c=<optimized out>) at /usr/src/debug/kdelibs-4.11.3/x86_64-redhat-linux-gnu/plasma/applet.moc:198
#27 0x000000312298df78 in QMetaObject::activate (sender=sender@entry=0x3c28390, m=m@entry=0x3125c3f380 <KDialog::staticMetaObject>, local_signal_index=local_signal_index@entry=7, argv=argv@entry=0x0) at kernel/qobject.cpp:3547
#28 0x00000031257a21d3 in KDialog::applyClicked (this=this@entry=0x3c28390) at /usr/src/debug/kdelibs-4.11.3/x86_64-redhat-linux-gnu/kdeui/kdialog.moc:259
#29 0x00000031257a2826 in KDialog::slotButtonClicked (this=0x3c28390, button=8) at /usr/src/debug/kdelibs-4.11.3/kdeui/dialogs/kdialog.cpp:888
#30 0x00000031257a419f in KDialog::qt_static_metacall (_o=<optimized out>, _id=<optimized out>, _a=<optimized out>, _c=<optimized out>) at /usr/src/debug/kdelibs-4.11.3/x86_64-redhat-linux-gnu/kdeui/kdialog.moc:166
#31 0x000000312298df78 in QMetaObject::activate (sender=sender@entry=0x3ac4f90, m=m@entry=0x3122cdad40 <QSignalMapper::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fff9fc8eb50) at kernel/qobject.cpp:3547
#32 0x000000312299564e in QSignalMapper::mapped (this=this@entry=0x3ac4f90, _t1=8) at .moc/release-shared/moc_qsignalmapper.cpp:114
#33 0x0000003122995756 in QSignalMapper::map (this=0x3ac4f90, sender=0x416a270) at kernel/qsignalmapper.cpp:266
#34 0x000000312298df78 in QMetaObject::activate (sender=sender@entry=0x416a270, m=m@entry=0x3123a91400 <QAbstractButton::staticMetaObject>, local_signal_index=local_signal_index@entry=2, argv=argv@entry=0x7fff9fc8ecc0) at kernel/qobject.cpp:3547
#35 0x000000312360eb22 in QAbstractButton::clicked (this=this@entry=0x416a270, _t1=false) at .moc/release-shared/moc_qabstractbutton.cpp:219
#36 0x0000003123374703 in QAbstractButtonPrivate::emitClicked (this=this@entry=0x42205a0) at widgets/qabstractbutton.cpp:548
#37 0x0000003123375903 in QAbstractButtonPrivate::click (this=this@entry=0x42205a0) at widgets/qabstractbutton.cpp:541
#38 0x00000031233759ec in QAbstractButton::mouseReleaseEvent (this=0x416a270, e=0x7fff9fc8f1b0) at widgets/qabstractbutton.cpp:1123
#39 0x0000003123017b1e in QWidget::event (this=0x416a270, event=0x7fff9fc8f1b0) at kernel/qwidget.cpp:8376
#40 0x0000003122fc84dc in QApplicationPrivate::notify_helper (this=0x14fbe50, receiver=0x416a270, e=0x7fff9fc8f1b0) at kernel/qapplication.cpp:4562
#41 0x0000003122fcebdd in QApplication::notify (this=this@entry=0x14dae30, receiver=receiver@entry=0x416a270, e=e@entry=0x7fff9fc8f1b0) at kernel/qapplication.cpp:4105
#42 0x000000312583fe9a in KApplication::notify (this=0x14dae30, receiver=0x416a270, event=0x7fff9fc8f1b0) at /usr/src/debug/kdelibs-4.11.3/kdeui/kernel/kapplication.cpp:311
#43 0x000000312297a26d in QCoreApplication::notifyInternal (this=0x14dae30, receiver=0x416a270, event=0x7fff9fc8f1b0) at kernel/qcoreapplication.cpp:949
#44 0x0000003122fce393 in QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0x416a270, event=event@entry=0x7fff9fc8f1b0, alienWidget=alienWidget@entry=0x416a270, nativeWidget=nativeWidget@entry=0x3c28390, buttonDown=buttonDown@entry=0x3123aa3258 <qt_button_down>, lastMouseReceiver=..., spontaneous=spontaneous@entry=true) at ../../src/corelib/kernel/qcoreapplication.h:231
#45 0x000000312303f92b in QETWidget::translateMouseEvent (this=this@entry=0x3c28390, event=event@entry=0x7fff9fc8f520) at kernel/qapplication_x11.cpp:4538
#46 0x000000312303e39c in QApplication::x11ProcessEvent (this=0x14dae30, event=event@entry=0x7fff9fc8f520) at kernel/qapplication_x11.cpp:3661
#47 0x0000003123064e54 in x11EventSourceDispatch (s=s@entry=0x14fd810, callback=0x0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:148
#48 0x0000003121447df6 in g_main_dispatch (context=0x14fc1e0) at gmain.c:3054
#49 g_main_context_dispatch (context=context@entry=0x14fc1e0) at gmain.c:3630
#50 0x0000003121448148 in g_main_context_iterate (context=context@entry=0x14fc1e0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3701
#51 0x00000031214481ec in g_main_context_iteration (context=0x14fc1e0, may_block=1) at gmain.c:3762
#52 0x00000031229a7145 in QEventDispatcherGlib::processEvents (this=0x1479240, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#53 0x0000003123064fc6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:207
#54 0x0000003122978ecf in QEventLoop::processEvents (this=this@entry=0x7fff9fc8f900, flags=...) at kernel/qeventloop.cpp:149
#55 0x00000031229791c5 in QEventLoop::exec (this=this@entry=0x7fff9fc8f900, flags=...) at kernel/qeventloop.cpp:204
#56 0x000000312297e45b in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1221
#57 0x0000003122fc6c9c in QApplication::exec () at kernel/qapplication.cpp:3823
#58 0x000000312a43c40c in kdemain (argc=1, argv=0x7fff9fc8fb58) at /usr/src/debug/kde-workspace-4.11.3/plasma/desktop/shell/main.cpp:126
#59 0x0000003fb3a21b45 in __libc_start_main (main=0x400940 <main(int, char**)>, argc=1, ubp_av=0x7fff9fc8fb58, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff9fc8fb48) at libc-start.c:274
#60 0x0000000000400971 in _start ()

Reported using DrKonqi
Comment 1 Elias Vanderstuyft 2013-11-29 18:08:43 UTC 
I found a way to always reproduce the bug:

1. Right-click on the Task Manager and open "Task Manager Settings".
2. Under "Sorting:", select "Alphabetically" and make sure to have "Highlight windows" disabled.
3. Click "OK".
4. Right-click on the Task Manager and open "Task Manager Settings".
5. Under "Sorting:", select "Manually".
6. Click "Apply".
7. Enable "Highlight windows".
8. Click "Apply".
9. Hover over all task entries (2 in my case: Firefox and Task Manager Settings)
=> crash
Comment 2 Christoph Feck 2013-11-29 20:33:56 UTC 

*** This bug has been marked as a duplicate of bug 325944 ***