Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.1 (KDE 4.3.1)
Qt Version: 4.5.2
Operating System: Linux 2.6.28-15-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
Plasma crashes when I hover the mouse cursor over the root folder to preview it (I'm logged in as non-root user). 
The First time it crashes, it restarts automatically, but when it crashes for the second time, I have to restart it manually (through Konsole).

 -- Backtrace:
Application: Plasma Workspace (plasma-desktop), signal: Segmentation fault
[Current thread is 0 (LWP 4128)]

Thread 2 (Thread 0xa953cb90 (LWP 4129)):
#0  0xb808e430 in __kernel_vsyscall ()
#1  0xb51dc0e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb63e12ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb65c6172 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#4  0xb7a05ac2 in ?? () from /usr/lib/libQtNetwork.so.4
#5  0xb65c5132 in ?? () from /usr/lib/libQtCore.so.4
#6  0xb51d84ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb63d249e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb4d0e710 (LWP 4128)):
[KCrash Handler]
#6  0xb6f77da8 in QGraphicsScene::drawItems () from /usr/lib/libQtGui.so.4
#7  0xb6f8d61c in QGraphicsView::drawItems () from /usr/lib/libQtGui.so.4
#8  0xb6f9a022 in QGraphicsView::paintEvent () from /usr/lib/libQtGui.so.4
#9  0xb699c74e in QWidget::event () from /usr/lib/libQtGui.so.4
#10 0xb6d4da53 in QFrame::event () from /usr/lib/libQtGui.so.4
#11 0xb6dedc2f in QAbstractScrollArea::viewportEvent () from /usr/lib/libQtGui.so.4
#12 0xb6f989b2 in QGraphicsView::viewportEvent () from /usr/lib/libQtGui.so.4
#13 0xb6df0235 in ?? () from /usr/lib/libQtGui.so.4
#14 0xb66b8dea in QCoreApplicationPrivate::sendThroughObjectEventFilters () from /usr/lib/libQtCore.so.4
#15 0xb6945d1a in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#16 0xb694e122 in QApplication::notify () from /usr/lib/libQtGui.so.4
#17 0xb778885d in KApplication::notify () from /usr/lib/libkdeui.so.5
#18 0xb66b9bcb in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#19 0xb6950e8e in QCoreApplication::sendSpontaneousEvent () from /usr/lib/libQtGui.so.4
#20 0xb69a44e9 in QWidgetPrivate::drawWidget () from /usr/lib/libQtGui.so.4
#21 0xb69a4c8e in QWidgetPrivate::paintSiblingsRecursive () from /usr/lib/libQtGui.so.4
#22 0xb69a40da in QWidgetPrivate::drawWidget () from /usr/lib/libQtGui.so.4
#23 0xb69a4c8e in QWidgetPrivate::paintSiblingsRecursive () from /usr/lib/libQtGui.so.4
#24 0xb69a40da in QWidgetPrivate::drawWidget () from /usr/lib/libQtGui.so.4
#25 0xb6b359ca in ?? () from /usr/lib/libQtGui.so.4
#26 0xb6994a06 in QWidgetPrivate::syncBackingStore () from /usr/lib/libQtGui.so.4
#27 0xb699cbb5 in QWidget::event () from /usr/lib/libQtGui.so.4
#28 0xb6945d3c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#29 0xb694e122 in QApplication::notify () from /usr/lib/libQtGui.so.4
#30 0xb778885d in KApplication::notify () from /usr/lib/libkdeui.so.5
#31 0xb66b9bcb in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#32 0xb66ba825 in QCoreApplicationPrivate::sendPostedEvents () from /usr/lib/libQtCore.so.4
#33 0xb66baa1d in QCoreApplication::sendPostedEvents () from /usr/lib/libQtCore.so.4
#34 0xb66e56af in ?? () from /usr/lib/libQtCore.so.4
#35 0xb4fd6b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#36 0xb4fda0eb in ?? () from /usr/lib/libglib-2.0.so.0
#37 0xb4fda268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#38 0xb66e52f8 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#39 0xb69e7a75 in ?? () from /usr/lib/libQtGui.so.4
#40 0xb66b81fa in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#41 0xb66b8642 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#42 0xb66baae9 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#43 0xb6945bb7 in QApplication::exec () from /usr/lib/libQtGui.so.4
#44 0xb8036310 in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#45 0x08048712 in _start ()

This bug may be a duplicate of or related to bug 205717

Reported using DrKonqi