Application: plasma-desktop (4.11.18)
KDE Platform Version: 4.14.7
Qt Version: 4.8.6
Operating System: Linux 3.19.5-200.fc21.x86_64 x86_64
Distribution: "Fedora release 21 (Twenty One)"

-- Information about the crash:
- What I was doing when the application crashed:
Added new widget by double clicking on launcher widget within widget adding thingy.
Nothing happened, so I tried dragging the new widget onto the panel.
Splat.

-- 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 0x7fe508241880 (LWP 1905))]

Thread 3 (Thread 0x7fe4d1748700 (LWP 1907)):
#0  0x00007fe506815590 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007fe4f006949a in QTWTF::TCMalloc_PageHeap::scavengerThread() () at /lib64/libQtScript.so.4
#2  0x00007fe4f00694c9 in  () at /lib64/libQtScript.so.4
#3  0x00007fe4ebb03754 in  () at /usr/lib64/nvidia-304xx/libGL.so.1
#4  0x00007fe50681052a in start_thread () at /lib64/libpthread.so.0
#5  0x00007fe504dd822d in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7fe44ff0b700 (LWP 1908)):
#0  0x00007fe504dccc8d in poll () at /lib64/libc.so.6
#1  0x00007fe5014b5b34 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#2  0x00007fe5014b5c4c in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#3  0x00007fe506bda4be in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#4  0x00007fe506ba9cc1 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#5  0x00007fe506baa025 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#6  0x00007fe506a9eb49 in QThread::exec() () at /lib64/libQtCore.so.4
#7  0x00007fe506b8a623 in QInotifyFileSystemWatcherEngine::run() () at /lib64/libQtCore.so.4
#8  0x00007fe506aa13af in QThreadPrivate::start(void*) () at /lib64/libQtCore.so.4
#9  0x00007fe4ebb03754 in  () at /usr/lib64/nvidia-304xx/libGL.so.1
#10 0x00007fe50681052a in start_thread () at /lib64/libpthread.so.0
#11 0x00007fe504dd822d in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7fe508241880 (LWP 1905)):
[KCrash Handler]
#6  0x0000000000000000 in  ()
#7  0x00007fe45034b870 in DeclarativeMimeData::DeclarativeMimeData(QMimeData const*) () at /usr/lib64/kde4/imports/org/kde/draganddrop/libdraganddropplugin.so
#8  0x00007fe45034b111 in DeclarativeDragDropEvent::DeclarativeDragDropEvent(QGraphicsSceneDragDropEvent*, DeclarativeDropArea*) () at /usr/lib64/kde4/imports/org/kde/draganddrop/libdraganddropplugin.so
#9  0x00007fe45034b284 in DeclarativeDropArea::dragLeaveEvent(QGraphicsSceneDragDropEvent*) () at /usr/lib64/kde4/imports/org/kde/draganddrop/libdraganddropplugin.so
#10 0x00007fe5062c5b79 in QGraphicsItem::sceneEvent(QEvent*) () at /lib64/libQtGui.so.4
#11 0x00007fe4ef829234 in QDeclarativeItem::sceneEvent(QEvent*) () at /lib64/libQtDeclarative.so.4
#12 0x00007fe5062ee797 in QGraphicsScenePrivate::sendDragDropEvent(QGraphicsItem*, QGraphicsSceneDragDropEvent*) () at /lib64/libQtGui.so.4
#13 0x00007fe5062ee7dc in QGraphicsScene::dragLeaveEvent(QGraphicsSceneDragDropEvent*) () at /lib64/libQtGui.so.4
#14 0x00007fe50630504f in QGraphicsScene::event(QEvent*) () at /lib64/libQtGui.so.4
#15 0x00007fe505ce2efc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQtGui.so.4
#16 0x00007fe505ce9958 in QApplication::notify(QObject*, QEvent*) () at /lib64/libQtGui.so.4
#17 0x00007fe507c11d3a in KApplication::notify(QObject*, QEvent*) () at /lib64/libkdeui.so.5
#18 0x00007fe506bab16d in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /lib64/libQtCore.so.4
#19 0x00007fe50631e308 in QGraphicsView::dragLeaveEvent(QDragLeaveEvent*) () at /lib64/libQtGui.so.4
#20 0x00007fe505d36118 in QWidget::event(QEvent*) () at /lib64/libQtGui.so.4
#21 0x00007fe5060f649e in QFrame::event(QEvent*) () at /lib64/libQtGui.so.4
#22 0x00007fe50631d9a1 in QGraphicsView::viewportEvent(QEvent*) () at /lib64/libQtGui.so.4
#23 0x00007fe506bab2d6 in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () at /lib64/libQtCore.so.4
#24 0x00007fe505ce2edc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQtGui.so.4
#25 0x00007fe505ceb4bf in QApplication::notify(QObject*, QEvent*) () at /lib64/libQtGui.so.4
#26 0x00007fe507c11d3a in KApplication::notify(QObject*, QEvent*) () at /lib64/libkdeui.so.5
#27 0x00007fe506bab16d in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /lib64/libQtCore.so.4
#28 0x00007fe505d6c59e in QX11Data::xdndHandleLeave(QWidget*, _XEvent const*, bool) () at /lib64/libQtGui.so.4
#29 0x00007fe505d6c6e0 in qt_xdnd_send_leave() [clone .part.64] () at /lib64/libQtGui.so.4
#30 0x00007fe505d6cada in QDragManager::cancel(bool) () at /lib64/libQtGui.so.4
#31 0x00007fe505cf47fa in QDrag::~QDrag() () at /lib64/libQtGui.so.4
#32 0x00007fe505cf4819 in QDrag::~QDrag() () at /lib64/libQtGui.so.4
#33 0x00007fe506bc2808 in QObjectPrivate::deleteChildren() () at /lib64/libQtCore.so.4
#34 0x00007fe505d35b43 in QWidget::~QWidget() () at /lib64/libQtGui.so.4
#35 0x00007fe505d35e59 in QWidget::~QWidget() () at /lib64/libQtGui.so.4
#36 0x00007fe506bc2808 in QObjectPrivate::deleteChildren() () at /lib64/libQtCore.so.4
#37 0x00007fe505d35b43 in QWidget::~QWidget() () at /lib64/libQtGui.so.4
#38 0x00007fe506313859 in QGraphicsView::~QGraphicsView() () at /lib64/libQtGui.so.4
#39 0x00007fe4e58d5908 in ControllerWindow::~ControllerWindow() () at /lib64/libkdeinit4_plasma-desktop.so
#40 0x00007fe4e58d5979 in ControllerWindow::~ControllerWindow() () at /lib64/libkdeinit4_plasma-desktop.so
#41 0x00007fe506bc43f8 in QObject::event(QEvent*) () at /lib64/libQtCore.so.4
#42 0x00007fe505d36633 in QWidget::event(QEvent*) () at /lib64/libQtGui.so.4
#43 0x00007fe505ce2efc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQtGui.so.4
#44 0x00007fe505ce9958 in QApplication::notify(QObject*, QEvent*) () at /lib64/libQtGui.so.4
#45 0x00007fe507c11d3a in KApplication::notify(QObject*, QEvent*) () at /lib64/libkdeui.so.5
#46 0x00007fe506bab16d in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /lib64/libQtCore.so.4
#47 0x00007fe506bae431 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /lib64/libQtCore.so.4
#48 0x00007fe506bda32e in postEventSourceDispatch(_GSource*, int (*)(void*), void*) () at /lib64/libQtCore.so.4
#49 0x00007fe5014b57fb in g_main_context_dispatch () at /lib64/libglib-2.0.so.0
#50 0x00007fe5014b5b98 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#51 0x00007fe5014b5c4c in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#52 0x00007fe506bda49e in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#53 0x00007fe505d86176 in QGuiEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtGui.so.4
#54 0x00007fe506ba9cc1 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#55 0x00007fe506baa025 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#56 0x00007fe505d6ef6d in QDragManager::drag(QDrag*) () at /lib64/libQtGui.so.4
#57 0x00007fe505cf494a in QDrag::exec(QFlags<Qt::DropAction>, Qt::DropAction) () at /lib64/libQtGui.so.4
#58 0x00007fe45034afc8 in DeclarativeDragArea::mouseMoveEvent(QGraphicsSceneMouseEvent*) () at /usr/lib64/kde4/imports/org/kde/draganddrop/libdraganddropplugin.so
#59 0x00007fe45034b079 in DeclarativeDragArea::sceneEventFilter(QGraphicsItem*, QEvent*) () at /usr/lib64/kde4/imports/org/kde/draganddrop/libdraganddropplugin.so
#60 0x00007fe5062e9d00 in QGraphicsScenePrivate::filterDescendantEvent(QGraphicsItem*, QEvent*) () at /lib64/libQtGui.so.4
#61 0x00007fe5062ee66e in QGraphicsScenePrivate::sendEvent(QGraphicsItem*, QEvent*) () at /lib64/libQtGui.so.4
#62 0x00007fe5062eeba7 in QGraphicsScenePrivate::sendMouseEvent(QGraphicsSceneMouseEvent*) () at /lib64/libQtGui.so.4
#63 0x00007fe5062f7e56 in QGraphicsScene::mouseMoveEvent(QGraphicsSceneMouseEvent*) () at /lib64/libQtGui.so.4
#64 0x00007fe506304e8f in QGraphicsScene::event(QEvent*) () at /lib64/libQtGui.so.4
#65 0x00007fe505ce2efc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQtGui.so.4
#66 0x00007fe505ce9958 in QApplication::notify(QObject*, QEvent*) () at /lib64/libQtGui.so.4
#67 0x00007fe507c11d3a in KApplication::notify(QObject*, QEvent*) () at /lib64/libkdeui.so.5
#68 0x00007fe506bab16d in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /lib64/libQtCore.so.4
#69 0x00007fe50631b158 in QGraphicsViewPrivate::mouseMoveEventHandler(QMouseEvent*) () at /lib64/libQtGui.so.4
#70 0x00007fe50631c1ea in QGraphicsView::mouseMoveEvent(QMouseEvent*) () at /lib64/libQtGui.so.4
#71 0x00007fe505d36118 in QWidget::event(QEvent*) () at /lib64/libQtGui.so.4
#72 0x00007fe5060f649e in QFrame::event(QEvent*) () at /lib64/libQtGui.so.4
#73 0x00007fe50631d9a1 in QGraphicsView::viewportEvent(QEvent*) () at /lib64/libQtGui.so.4
#74 0x00007fe506bab2d6 in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () at /lib64/libQtCore.so.4
#75 0x00007fe505ce2edc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQtGui.so.4
#76 0x00007fe505ce9abf in QApplication::notify(QObject*, QEvent*) () at /lib64/libQtGui.so.4
#77 0x00007fe507c11d3a in KApplication::notify(QObject*, QEvent*) () at /lib64/libkdeui.so.5
#78 0x00007fe506bab16d in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /lib64/libQtCore.so.4
#79 0x00007fe505ce911f in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () at /lib64/libQtGui.so.4
#80 0x00007fe505d5f562 in QETWidget::translateMouseEvent(_XEvent const*) () at /lib64/libQtGui.so.4
#81 0x00007fe505d5df5c in QApplication::x11ProcessEvent(_XEvent*) () at /lib64/libQtGui.so.4
#82 0x00007fe505d85ff4 in x11EventSourceDispatch(_GSource*, int (*)(void*), void*) () at /lib64/libQtGui.so.4
#83 0x00007fe5014b57fb in g_main_context_dispatch () at /lib64/libglib-2.0.so.0
#84 0x00007fe5014b5b98 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#85 0x00007fe5014b5c4c in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#86 0x00007fe506bda49e in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#87 0x00007fe505d86176 in QGuiEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtGui.so.4
#88 0x00007fe506ba9cc1 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#89 0x00007fe506baa025 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#90 0x00007fe506baf709 in QCoreApplication::exec() () at /lib64/libQtCore.so.4
#91 0x00007fe4e58e75dd in kdemain () at /lib64/libkdeinit4_plasma-desktop.so
#92 0x000000000040825d in launch(int, char const*, char const*, char const*, int, char const*, bool, char const*, bool, char const*) ()
#93 0x00000000004090a9 in handle_launcher_request(int, char const*) [clone .isra.15] ()
#94 0x0000000000409787 in handle_requests(int) ()
#95 0x000000000040537d in main ()

Reported using DrKonqi