Application: plasma-desktop (4.11.15)
KDE Platform Version: 4.14.4
Qt Version: 4.8.6
Operating System: Linux 3.18.6-200.fc21.x86_64 x86_64
Distribution: "Fedora release 21 (Twenty One)"

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

There were two gsmartcontrol windows open but minimized.  I clicked on the taskbar to list both of them, and then attempt to select one.   However, I missed, and somehow ended up trying to drag the task onto the desktop.  At that point, the taskbar crashed.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fdb80f09900 (LWP 1769))]

Thread 3 (Thread 0x7fdb6f777700 (LWP 1771)):
#0  0x00000038e820c590 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x000000391c19745a in QTWTF::TCMalloc_PageHeap::scavengerThread() () at /lib64/libQtScript.so.4
#2  0x000000391c197489 in  () at /lib64/libQtScript.so.4
#3  0x00000038e820752a in start_thread () at /lib64/libpthread.so.0
#4  0x00000038e7b0079d in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7fdaed9d5700 (LWP 1772)):
#0  0x00007fff32f26b3b in clock_gettime ()
#1  0x00000038e7b0ea1d in clock_gettime () at /lib64/libc.so.6
#2  0x00000038f5cd34e5 in qt_gettime() () at /lib64/libQtCore.so.4
#3  0x00000038f5db5855 in QTimerInfoList::timerWait(timeval&) () at /lib64/libQtCore.so.4
#4  0x00000038f5db40fc in timerSourcePrepareHelper(GTimerSource*, int*) () at /lib64/libQtCore.so.4
#5  0x00000038f5db41c5 in timerSourcePrepare(_GSource*, int*) () at /lib64/libQtCore.so.4
#6  0x00000038e9a493ed in g_main_context_prepare () at /lib64/libglib-2.0.so.0
#7  0x00000038e9a49d4b in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#8  0x00000038e9a49f3c in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#9  0x00000038f5db4a3e in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#10 0x00000038f5d84261 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#11 0x00000038f5d845c5 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#12 0x00000038f5c79b59 in QThread::exec() () at /lib64/libQtCore.so.4
#13 0x00000038f5d64cc3 in QInotifyFileSystemWatcherEngine::run() () at /lib64/libQtCore.so.4
#14 0x00000038f5c7c3bf in QThreadPrivate::start(void*) () at /lib64/libQtCore.so.4
#15 0x00000038e820752a in start_thread () at /lib64/libpthread.so.0
#16 0x00000038e7b0079d in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7fdb80f09900 (LWP 1769)):
[KCrash Handler]
#5  0x00000038f5d3a308 in QUrl::operator=(QUrl const&) () at /lib64/libQtCore.so.4
#6  0x00000031862116b2 in QDeclarativeError::operator=(QDeclarativeError const&) () at /lib64/libQtDeclarative.so.4
#7  0x00000031861be734 in QDeclarativeExpression::error() const () at /lib64/libQtDeclarative.so.4
#8  0x00000031861f9f5b in QDeclarativeBoundSignal::qt_metacall(QMetaObject::Call, int, void**) () at /lib64/libQtDeclarative.so.4
#9  0x00000038f5d9a5fb in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () at /lib64/libQtCore.so.4
#10 0x0000003c0c60ecb1 in MouseEventListener::mouseMoveEvent(QGraphicsSceneMouseEvent*) () at /usr/lib64/kde4/imports/org/kde/qtextracomponents/libqtextracomponentsplugin.so
#11 0x0000003b6c9a8d13 in QGraphicsItem::sceneEvent(QEvent*) () at /lib64/libQtGui.so.4
#12 0x0000003186153014 in QDeclarativeItem::sceneEvent(QEvent*) () at /lib64/libQtDeclarative.so.4
#13 0x0000003b6c9d1e17 in QGraphicsScenePrivate::sendMouseEvent(QGraphicsSceneMouseEvent*) () at /lib64/libQtGui.so.4
#14 0x0000003b6c9dc216 in QGraphicsScene::mouseMoveEvent(QGraphicsSceneMouseEvent*) () at /lib64/libQtGui.so.4
#15 0x0000003b6c9e8e5f in QGraphicsScene::event(QEvent*) () at /lib64/libQtGui.so.4
#16 0x0000003b6c3c7efc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQtGui.so.4
#17 0x0000003b6c3ce958 in QApplication::notify(QObject*, QEvent*) () at /lib64/libQtGui.so.4
#18 0x000000317ea4e86a in KApplication::notify(QObject*, QEvent*) () at /lib64/libkdeui.so.5
#19 0x00000038f5d8570d in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /lib64/libQtCore.so.4
#20 0x0000003b6c9ff0f8 in QGraphicsViewPrivate::mouseMoveEventHandler(QMouseEvent*) () at /lib64/libQtGui.so.4
#21 0x0000003b6ca0018a in QGraphicsView::mouseMoveEvent(QMouseEvent*) () at /lib64/libQtGui.so.4
#22 0x0000003b6c41b118 in QWidget::event(QEvent*) () at /lib64/libQtGui.so.4
#23 0x0000003b6c7da31e in QFrame::event(QEvent*) () at /lib64/libQtGui.so.4
#24 0x0000003b6ca01941 in QGraphicsView::viewportEvent(QEvent*) () at /lib64/libQtGui.so.4
#25 0x00000038f5d85876 in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () at /lib64/libQtCore.so.4
#26 0x0000003b6c3c7edc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQtGui.so.4
#27 0x0000003b6c3ceabf in QApplication::notify(QObject*, QEvent*) () at /lib64/libQtGui.so.4
#28 0x000000317ea4e86a in KApplication::notify(QObject*, QEvent*) () at /lib64/libkdeui.so.5
#29 0x00000038f5d8570d in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /lib64/libQtCore.so.4
#30 0x0000003b6c3ce11f in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () at /lib64/libQtGui.so.4
#31 0x0000003b6c4448ca in QETWidget::translateMouseEvent(_XEvent const*) () at /lib64/libQtGui.so.4
#32 0x0000003b6c442f2c in QApplication::x11ProcessEvent(_XEvent*) () at /lib64/libQtGui.so.4
#33 0x0000003b6c46afb4 in x11EventSourceDispatch(_GSource*, int (*)(void*), void*) () at /lib64/libQtGui.so.4
#34 0x00000038e9a49aeb in g_main_context_dispatch () at /lib64/libglib-2.0.so.0
#35 0x00000038e9a49e88 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#36 0x00000038e9a49f3c in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#37 0x00000038f5db4a1e in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#38 0x0000003b6c46b136 in QGuiEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtGui.so.4
#39 0x00000038f5d84261 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#40 0x00000038f5d845c5 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#41 0x00000038f5d89ca9 in QCoreApplication::exec() () at /lib64/libQtCore.so.4
#42 0x00000031d88405cd in kdemain () at /lib64/libkdeinit4_plasma-desktop.so
#43 0x00000038e7a1ffe0 in __libc_start_main () at /lib64/libc.so.6
#44 0x000000000040093e in _start ()

Possible duplicates by query: bug 342700, bug 336064, bug 335632, bug 334971.

Reported using DrKonqi