Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.4 (KDE 4.3.4)
Qt Version: 4.6.0
Operating System: Linux 2.6.32 i686
Distribution: Debian GNU/Linux testing (squeeze)

What I was doing when the application crashed:
I started many simultaneous file copies from Dolphin, each with its own notification. The panel disappeared, but the notifications continued for a bit, then eventually the crash assistant came up and the panel restarted.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0xb55c4700 (LWP 3032))]

Thread 2 (Thread 0xa8482b70 (LWP 3033)):
#0  0xb771c424 in __kernel_vsyscall ()
#1  0xb5e070a5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/i686/cmov/libpthread.so.0
#2  0xb5ef27dd in pthread_cond_wait () from /lib/i686/cmov/libc.so.6
#3  0xb74eb602 in QWaitConditionPrivate::wait (this=0x855cbb0, mutex=0x855cbac, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  QWaitCondition::wait (this=0x855cbb0, mutex=0x855cbac, time=4294967295) at thread/qwaitcondition_unix.cpp:159
#5  0xb5c3ba9a in QHostInfoAgent::run (this=0x855cba0) at kernel/qhostinfo.cpp:252
#6  0xb74ea70e in QThreadPrivate::start (arg=0x855cba0) at thread/qthread_unix.cpp:244
#7  0xb5e03585 in start_thread () from /lib/i686/cmov/libpthread.so.0
#8  0xb5ee526e in clone () from /lib/i686/cmov/libc.so.6

Thread 1 (Thread 0xb55c4700 (LWP 3032)):
[KCrash Handler]
#6  QGraphicsSceneIndexPrivate::recursive_items_helper (this=0x831fc60, item=0x89cd5d8, exposeRect=..., intersector=0x82eb5d8, items=0xbf97afdc, viewTransform=..., mode=Qt::IntersectsItemShape, 
    parentOpacity=1) at graphicsview/qgraphicssceneindex.cpp:278
#7  0xb6851256 in QGraphicsSceneIndexPrivate::items_helper (this=0x8314ed8, rect=..., mode=Qt::IntersectsItemShape, order=Qt::DescendingOrder, deviceTransform=...)
    at graphicsview/qgraphicssceneindex_p.h:159
#8  QGraphicsSceneIndex::items (this=0x8314ed8, rect=..., mode=Qt::IntersectsItemShape, order=Qt::DescendingOrder, deviceTransform=...) at graphicsview/qgraphicssceneindex.cpp:457
#9  0xb6827d1b in QGraphicsScene::items (this=0x82868c0, rect=..., mode=Qt::IntersectsItemShape, order=Qt::DescendingOrder, deviceTransform=...) at graphicsview/qgraphicsscene.cpp:2024
#10 0xb682ed5e in QGraphicsScenePrivate::itemsAtPosition (this=0x831fa60, screenPos=..., scenePos=..., widget=0x85c9c88) at graphicsview/qgraphicsscene.cpp:1023
#11 0xb682f2b7 in QGraphicsScenePrivate::dispatchHoverEvent (this=0x831fa60, hoverEvent=0xbf97b028) at graphicsview/qgraphicsscene.cpp:3768
#12 0xb682f538 in QGraphicsScene::mouseMoveEvent (this=0x82868c0, mouseEvent=0xbf97b5a4) at graphicsview/qgraphicsscene.cpp:3976
#13 0xb683fbcf in QGraphicsScene::event (this=0x82868c0, event=0xbf97b5a4) at graphicsview/qgraphicsscene.cpp:3341
#14 0xb61a7b5c in QApplicationPrivate::notify_helper (this=0x8287318, receiver=0x82868c0, e=0xbf97b5a4) at kernel/qapplication.cpp:4242
#15 0xb61af33d in QApplication::notify (this=0x82810c0, receiver=0x82868c0, e=0xbf97b5a4) at kernel/qapplication.cpp:3661
#16 0xb6cab62d in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#17 0xb75ed3eb in QCoreApplication::notifyInternal (this=0x82810c0, receiver=0x82810c0, event=0xbf97b5a4) at kernel/qcoreapplication.cpp:704
#18 0xb61a892e in QCoreApplication::sendSpontaneousEvent (receiver=0x82868c0, event=0x831fc60) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#19 qt_sendSpontaneousEvent (receiver=0x82868c0, event=0x831fc60) at kernel/qapplication.cpp:5219
#20 0xb685d160 in QGraphicsViewPrivate::mouseMoveEventHandler (this=0x85c6e18, event=0xbf97be7c) at graphicsview/qgraphicsview.cpp:617
#21 0xb685d296 in QGraphicsView::mouseMoveEvent (this=0x85c8088, event=0xbf97be7c) at graphicsview/qgraphicsview.cpp:3157
#22 0xb62057eb in QWidget::event (this=0x85c8088, event=0xbf97be7c) at kernel/qwidget.cpp:7959
#23 0xb65f2523 in QFrame::event (this=0x85c8088, e=0xbf97be7c) at widgets/qframe.cpp:557
#24 0xb668b5d2 in QAbstractScrollArea::viewportEvent (this=0x85c8088, e=0x831fc60) at widgets/qabstractscrollarea.cpp:1032
#25 0xb6858f5a in QGraphicsView::viewportEvent (this=0x85c8088, event=0xbf97be7c) at graphicsview/qgraphicsview.cpp:2747
#26 0xb668dfb5 in QAbstractScrollAreaPrivate::viewportEvent (this=0x85c7ca8, o=0x85c9c88, e=0xbf97be7c) at widgets/qabstractscrollarea_p.h:100
#27 QAbstractScrollAreaFilter::eventFilter (this=0x85c7ca8, o=0x85c9c88, e=0xbf97be7c) at widgets/qabstractscrollarea_p.h:116
#28 0xb75ec70a in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0x8287318, receiver=0x85c9c88, event=0xbf97be7c) at kernel/qcoreapplication.cpp:819
#29 0xb61a7b39 in QApplicationPrivate::notify_helper (this=0x8287318, receiver=0x85c9c88, e=0xbf97be7c) at kernel/qapplication.cpp:4238
#30 0xb61affa2 in QApplication::notify (this=0x82810c0, receiver=0x85c9c88, e=0xbf97be7c) at kernel/qapplication.cpp:3822
#31 0xb6cab62d in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#32 0xb75ed3eb in QCoreApplication::notifyInternal (this=0x82810c0, receiver=0x82810c0, event=0xbf97be7c) at kernel/qcoreapplication.cpp:704
#33 0xb61aec61 in QCoreApplication::sendEvent (receiver=0x85c9c88, event=0xbf97be7c, alienWidget=0x85c9c88, nativeWidget=0x8596498, buttonDown=0xb6ad8920, lastMouseReceiver=..., spontaneous=true)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#34 QApplicationPrivate::sendMouseEvent (receiver=0x85c9c88, event=0xbf97be7c, alienWidget=0x85c9c88, nativeWidget=0x8596498, buttonDown=0xb6ad8920, lastMouseReceiver=..., spontaneous=true)
    at kernel/qapplication.cpp:2956
#35 0xb6238115 in QETWidget::translateMouseEvent (this=0x8596498, event=0xbf97c2fc) at kernel/qapplication_x11.cpp:4368
#36 0xb6236e6b in QApplication::x11ProcessEvent (this=0x82810c0, event=0xbf97c2fc) at kernel/qapplication_x11.cpp:3501
#37 0xb6263e52 in x11EventSourceDispatch (s=0x8289e00, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#38 0xb5d59b38 in g_main_dispatch (context=0x8289240) at /build/buildd-glib2.0_2.22.4-1-i386-jRfNZE/glib2.0-2.22.4/glib/gmain.c:1960
#39 IA__g_main_context_dispatch (context=0x8289240) at /build/buildd-glib2.0_2.22.4-1-i386-jRfNZE/glib2.0-2.22.4/glib/gmain.c:2513
#40 0xb5d5d3d0 in g_main_context_iterate (context=0x8289240, block=<value optimized out>, dispatch=1, self=0x8286dc0) at /build/buildd-glib2.0_2.22.4-1-i386-jRfNZE/glib2.0-2.22.4/glib/gmain.c:2591
#41 0xb5d5d503 in IA__g_main_context_iteration (context=0x8289240, may_block=1) at /build/buildd-glib2.0_2.22.4-1-i386-jRfNZE/glib2.0-2.22.4/glib/gmain.c:2654
#42 0xb76194e1 in QEventDispatcherGlib::processEvents (this=0x8287108, flags=...) at kernel/qeventdispatcher_glib.cpp:407
#43 0xb62639a5 in QGuiEventDispatcherGlib::processEvents (this=0x8287108, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#44 0xb75eba3a in QEventLoop::processEvents (this=0xbf97c5b0, flags=...) at kernel/qeventloop.cpp:149
#45 0xb75ebe82 in QEventLoop::exec (this=0xbf97c5b0, flags=...) at kernel/qeventloop.cpp:201
#46 0xb75ee599 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:981
#47 0xb61a7bf7 in QApplication::exec () at kernel/qapplication.cpp:3570
#48 0xb3bb05cd in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#49 0x0804e291 in _start ()

Reported using DrKonqi