Version:           2.4.0 (using KDE 4.6.2) 
OS:                Linux

here is the trace of the crash:

Application: Plasma-Desktop-Umgebung (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f7a63caf7c0 (LWP 1790))]

Thread 4 (Thread 0x7f7a3effa700 (LWP 1794)):
#0  0x00007f7a635ca4e0 in pthread_mutex_unlock (mutex=0x29302e8) at forward.c:184
#1  0x00007f7a57f8f094 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7a57f8ff9d in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7a57f90639 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f7a607bc446 in QEventDispatcherGlib::processEvents (this=0x2944470, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#5  0x00007f7a60790882 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#6  0x00007f7a60790abc in QEventLoop::exec (this=0x7f7a3eff9cd0, flags=...) at kernel/qeventloop.cpp:201
#7  0x00007f7a606a7924 in QThread::exec (this=<value optimized out>) at thread/qthread.cpp:492
#8  0x00007f7a60772c2f in QInotifyFileSystemWatcherEngine::run (this=0x294bbf0) at io/qfilesystemwatcher_inotify.cpp:248
#9  0x00007f7a606aa175 in QThreadPrivate::start (arg=0x294bbf0) at thread/qthread_unix.cpp:320
#10 0x00007f7a56015853 in ?? () from /usr/lib/nvidia-current/libGL.so.1
#11 0x00007f7a58893d8c in start_thread (arg=0x7f7a3effa700) at pthread_create.c:304
#12 0x00007f7a635bb04d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#13 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f7a3cc0c700 (LWP 1796)):
#0  0x00007f7a635adf03 in __poll (fds=<value optimized out>, nfds=<value optimized out>, timeout=<value optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f7a57f90104 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7a57f909f2 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7a3df3ec44 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007f7a57fb73e4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f7a56015853 in ?? () from /usr/lib/nvidia-current/libGL.so.1
#6  0x00007f7a58893d8c in start_thread (arg=0x7f7a3cc0c700) at pthread_create.c:304
#7  0x00007f7a635bb04d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#8  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f7a37df6700 (LWP 1797)):
#0  0x00007f7a635adf03 in __poll (fds=<value optimized out>, nfds=<value optimized out>, timeout=<value optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f7a57f90104 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7a57f90639 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7a607bc446 in QEventDispatcherGlib::processEvents (this=0x29eac50, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007f7a60790882 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f7a60790abc in QEventLoop::exec (this=0x7f7a37df5cd0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007f7a606a7924 in QThread::exec (this=<value optimized out>) at thread/qthread.cpp:492
#7  0x00007f7a60772c2f in QInotifyFileSystemWatcherEngine::run (this=0x2ac6170) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f7a606aa175 in QThreadPrivate::start (arg=0x2ac6170) at thread/qthread_unix.cpp:320
#9  0x00007f7a56015853 in ?? () from /usr/lib/nvidia-current/libGL.so.1
#10 0x00007f7a58893d8c in start_thread (arg=0x7f7a37df6700) at pthread_create.c:304
#11 0x00007f7a635bb04d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f7a63caf7c0 (LWP 1790)):
[KCrash Handler]
#6  0x00007f7a613f05df in QString (this=0x3140075, group=0, state=0) at /usr/include/qt4/QtCore/qstring.h:728
#7  KIconEffect::fingerprint (this=0x3140075, group=0, state=0) at ../../kdeui/icons/kiconeffect.cpp:169
#8  0x00007f7a613f5feb in KIconLoaderPrivate::makeCacheKey (this=<value optimized out>, name=..., group=KIconLoader::Desktop, overlays=..., size=24, state=0) at ../../kdeui/icons/kiconloader.cpp:782
#9  0x00007f7a613fcd03 in KIconLoader::loadIcon (this=0x2c44400, _name=<value optimized out>, group=KIconLoader::Desktop, size=24, state=0, overlays=..., path_store=0x0, canReturnNull=false) at ../../kdeui/icons/kiconloader.cpp:1226
#10 0x00007f7a613f4c99 in KIconEngine::pixmap (this=<value optimized out>, size=..., mode=<value optimized out>, state=<value optimized out>) at ../../kdeui/icons/kiconengine.cpp:93
#11 0x00007f7a5fbfbdd5 in QIcon::pixmap (this=<value optimized out>, size=<value optimized out>, mode=<value optimized out>, state=<value optimized out>) at image/qicon.cpp:676
#12 0x00007f7a6319d099 in Plasma::IconWidgetPrivate::decoration (this=0x315ae30, option=<value optimized out>, useHoverEffect=false, usePressedEffect=false) at ../../plasma/widgets/iconwidget.cpp:812
#13 0x00007f7a631a2e51 in Plasma::IconWidget::paint (this=0x3154650, painter=0x7fff128e0420, option=0x2196f78, widget=<value optimized out>) at ../../plasma/widgets/iconwidget.cpp:1128
#14 0x00007f7a482823e9 in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#15 0x00007f7a6014219d in _q_paintItem (item=<value optimized out>, painter=0x7fff128e0420, option=0x2196f78, widget=0x0, useWindowOpacity=<value optimized out>, painterStateProtection=true) at graphicsview/qgraphicsscene.cpp:4314
#16 0x00007f7a601424b0 in _q_paintIntoCache (pix=0x7fff128e0950, item=0x3154660, pixmapExposed=..., itemToPixmap=..., renderHints=..., option=0x2196f78, painterStateProtection=true) at graphicsview/qgraphicsscene.cpp:4352
#17 0x00007f7a60155ce8 in QGraphicsScenePrivate::drawItemHelper (this=0x2196d50, item=0x3154660, painter=0x7fff128e2960, option=0x2196f78, widget=<value optimized out>, painterStateProtection=true) at graphicsview/qgraphicsscene.cpp:4690
#18 0x00007f7a601568ba in QGraphicsScenePrivate::draw (this=0x2196d50, item=0x3154660, painter=0x7fff128e2960, viewTransform=0x7fff128e26f0, transformPtr=0x7fff128e1010, exposedRegion=0x2f16740, widget=0x2aac0b0, opacity=1, effectTransform=0x0, wasDirtyParentSceneTransform=false, drawItem=true) at graphicsview/qgraphicsscene.cpp:4962
#19 0x00007f7a60157565 in QGraphicsScenePrivate::drawSubtreeRecursive (this=0x2196d50, item=0x3154660, painter=0x7fff128e2960, viewTransform=0x7fff128e26f0, exposedRegion=0x2f16740, widget=0x2aac0b0, parentOpacity=<value optimized out>, effectTransform=0x0) at graphicsview/qgraphicsscene.cpp:4853
#20 0x00007f7a60156730 in QGraphicsScenePrivate::draw (this=0x2196d50, item=0x2543fe0, painter=0x7fff128e2960, viewTransform=0x7fff128e26f0, transformPtr=0x7fff128e1610, exposedRegion=0x2f16740, widget=0x2aac0b0, opacity=1, effectTransform=0x0, wasDirtyParentSceneTransform=false, drawItem=true) at graphicsview/qgraphicsscene.cpp:4979
#21 0x00007f7a60157565 in QGraphicsScenePrivate::drawSubtreeRecursive (this=0x2196d50, item=0x2543fe0, painter=0x7fff128e2960, viewTransform=0x7fff128e26f0, exposedRegion=0x2f16740, widget=0x2aac0b0, parentOpacity=<value optimized out>, effectTransform=0x0) at graphicsview/qgraphicsscene.cpp:4853
#22 0x00007f7a60156730 in QGraphicsScenePrivate::draw (this=0x2196d50, item=0x25215f0, painter=0x7fff128e2960, viewTransform=0x7fff128e26f0, transformPtr=0x7fff128e1c10, exposedRegion=0x2f16740, widget=0x2aac0b0, opacity=1, effectTransform=0x0, wasDirtyParentSceneTransform=false, drawItem=true) at graphicsview/qgraphicsscene.cpp:4979
#23 0x00007f7a60157565 in QGraphicsScenePrivate::drawSubtreeRecursive (this=0x2196d50, item=0x25215f0, painter=0x7fff128e2960, viewTransform=0x7fff128e26f0, exposedRegion=0x2f16740, widget=0x2aac0b0, parentOpacity=<value optimized out>, effectTransform=0x0) at graphicsview/qgraphicsscene.cpp:4853
#24 0x00007f7a60156730 in QGraphicsScenePrivate::draw (this=0x2196d50, item=0x233e5e0, painter=0x7fff128e2960, viewTransform=0x7fff128e26f0, transformPtr=0x7fff128e2210, exposedRegion=0x2f16740, widget=0x2aac0b0, opacity=1, effectTransform=0x0, wasDirtyParentSceneTransform=false, drawItem=true) at graphicsview/qgraphicsscene.cpp:4979
#25 0x00007f7a60157565 in QGraphicsScenePrivate::drawSubtreeRecursive (this=0x2196d50, item=0x233e5e0, painter=0x7fff128e2960, viewTransform=0x7fff128e26f0, exposedRegion=0x2f16740, widget=0x2aac0b0, parentOpacity=<value optimized out>, effectTransform=0x0) at graphicsview/qgraphicsscene.cpp:4853
#26 0x00007f7a60157d94 in QGraphicsScenePrivate::drawItems (this=0x2196d50, painter=0x7fff128e2960, viewTransform=0x7fff128e26f0, exposedRegion=0x2f16740, widget=0x2aac0b0) at graphicsview/qgraphicsscene.cpp:4735
#27 0x00007f7a60174bd2 in QGraphicsView::paintEvent (this=<value optimized out>, event=<value optimized out>) at graphicsview/qgraphicsview.cpp:3469
#28 0x00007f7a5fba3c6a in QWidget::event (this=0x2f13c50, event=0x7fff128e3280) at kernel/qwidget.cpp:8405
#29 0x00007f7a5ff53a66 in QFrame::event (this=0x2f13c50, e=0x7fff128e3280) at widgets/qframe.cpp:557
#30 0x00007f7a60175e8b in QGraphicsView::viewportEvent (this=0x2f13c50, event=0x7fff128e3280) at graphicsview/qgraphicsview.cpp:2864
#31 0x00007f7a60791627 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=<value optimized out>, receiver=0x2aac0b0, event=0x7fff128e3280) at kernel/qcoreapplication.cpp:846
#32 0x00007f7a5fb529b1 in QApplicationPrivate::notify_helper (this=0x218a1d0, receiver=0x2aac0b0, e=0x7fff128e3280) at kernel/qapplication.cpp:4458
#33 0x00007f7a5fb573aa in QApplication::notify (this=<value optimized out>, receiver=0x2aac0b0, e=0x7fff128e3280) at kernel/qapplication.cpp:4341
#34 0x00007f7a61449866 in KApplication::notify (this=0x2178980, receiver=0x2aac0b0, event=0x7fff128e3280) at ../../kdeui/kernel/kapplication.cpp:311
#35 0x00007f7a6079149c in QCoreApplication::notifyInternal (this=0x2178980, receiver=0x2aac0b0, event=0x7fff128e3280) at kernel/qcoreapplication.cpp:731
#36 0x00007f7a5fba0abd in sendSpontaneousEvent (this=0x2f31d60, pdev=0x2cd7ba8, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x2c19230) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#37 QWidgetPrivate::drawWidget (this=0x2f31d60, pdev=0x2cd7ba8, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x2c19230) at kernel/qwidget.cpp:5492
#38 0x00007f7a5fba16d2 in QWidgetPrivate::paintSiblingsRecursive (this=0x2f162b0, pdev=0x2cd7ba8, siblings=..., index=<value optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x2c19230) at kernel/qwidget.cpp:5699
#39 0x00007f7a5fba07fc in QWidgetPrivate::drawWidget (this=0x2f162b0, pdev=0x2cd7ba8, rgn=..., offset=..., flags=<value optimized out>, sharedPainter=0x0, backingStore=0x2c19230) at kernel/qwidget.cpp:5545
#40 0x00007f7a5fd652fb in QWidgetBackingStore::sync (this=0x2c19230) at painting/qbackingstore.cpp:1333
#41 0x00007f7a5fb96f50 in QWidgetPrivate::syncBackingStore (this=0x2f162b0) at kernel/qwidget.cpp:1842
#42 0x00007f7a5fba4184 in QWidget::event (this=0x2f13c50, event=0x2c44400) at kernel/qwidget.cpp:8552
#43 0x00007f7a5ff53a66 in QFrame::event (this=0x2f13c50, e=0x2c44400) at widgets/qframe.cpp:557
#44 0x00007f7a5ffd51fb in QAbstractScrollArea::event (this=0x2f13c50, e=0x2c44400) at widgets/qabstractscrollarea.cpp:996
#45 0x00007f7a638acfe6 in ?? () from /usr/lib/kde4/libkdeinit/libkdeinit4_plasma-desktop.so
#46 0x00007f7a5fb529e4 in QApplicationPrivate::notify_helper (this=0x218a1d0, receiver=0x2f13c50, e=0x2c44400) at kernel/qapplication.cpp:4462
#47 0x00007f7a5fb573aa in QApplication::notify (this=<value optimized out>, receiver=0x2f13c50, e=0x2c44400) at kernel/qapplication.cpp:4341
#48 0x00007f7a61449866 in KApplication::notify (this=0x2178980, receiver=0x2f13c50, event=0x2c44400) at ../../kdeui/kernel/kapplication.cpp:311
#49 0x00007f7a6079149c in QCoreApplication::notifyInternal (this=0x2178980, receiver=0x2f13c50, event=0x2c44400) at kernel/qcoreapplication.cpp:731
#50 0x00007f7a60794c25 in sendEvent (receiver=0x2f13c50, event_type=77, data=0x20bdb60) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#51 QCoreApplicationPrivate::sendPostedEvents (receiver=0x2f13c50, event_type=77, data=0x20bdb60) at kernel/qcoreapplication.cpp:1372
#52 0x00007f7a6014e88a in dispatchPendingUpdateRequests (this=0x2196d50) at ../../include/QtGui/private/../../../src/gui/graphicsview/qgraphicsview_p.h:189
#53 QGraphicsScenePrivate::_q_processDirtyItems (this=0x2196d50) at graphicsview/qgraphicsscene.cpp:510
#54 0x00007f7a6014ecaa in QGraphicsScene::qt_metacall (this=0x229f420, _c=QMetaObject::InvokeMetaMethod, _id=14, _a=0x2c37530) at .moc/release-shared/moc_qgraphicsscene.cpp:130
#55 0x00007f7a630f0b65 in Plasma::Corona::qt_metacall (this=0x229f420, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x2c37530) at ./corona.moc:109
#56 0x00007f7a638a1065 in ?? () from /usr/lib/kde4/libkdeinit/libkdeinit4_plasma-desktop.so
#57 0x00007f7a607a549a in QObject::event (this=0x229f420, e=<value optimized out>) at kernel/qobject.cpp:1226
#58 0x00007f7a6015b58b in QGraphicsScene::event (this=0x229f420, event=0x31562e0) at graphicsview/qgraphicsscene.cpp:3544
#59 0x00007f7a5fb529e4 in QApplicationPrivate::notify_helper (this=0x218a1d0, receiver=0x229f420, e=0x31562e0) at kernel/qapplication.cpp:4462
#60 0x00007f7a5fb573aa in QApplication::notify (this=<value optimized out>, receiver=0x229f420, e=0x31562e0) at kernel/qapplication.cpp:4341
#61 0x00007f7a61449866 in KApplication::notify (this=0x2178980, receiver=0x229f420, event=0x31562e0) at ../../kdeui/kernel/kapplication.cpp:311
#62 0x00007f7a6079149c in QCoreApplication::notifyInternal (this=0x2178980, receiver=0x229f420, event=0x31562e0) at kernel/qcoreapplication.cpp:731
#63 0x00007f7a60794c25 in sendEvent (receiver=0x0, event_type=0, data=0x20bdb60) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#64 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x20bdb60) at kernel/qcoreapplication.cpp:1372
#65 0x00007f7a607bc253 in sendPostedEvents (s=0x21901c0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:220
#66 postEventSourceDispatch (s=0x21901c0) at kernel/qeventdispatcher_glib.cpp:277
#67 0x00007f7a57f8fbcd in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#68 0x00007f7a57f903a8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#69 0x00007f7a57f90639 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#70 0x00007f7a607bc3ef in QEventDispatcherGlib::processEvents (this=0x20bd340, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#71 0x00007f7a5fbf9dfe in QGuiEventDispatcherGlib::processEvents (this=<value optimized out>, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#72 0x00007f7a60790882 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#73 0x00007f7a60790abc in QEventLoop::exec (this=0x7fff128e5220, flags=...) at kernel/qeventloop.cpp:201
#74 0x00007f7a60794ecb in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1008
#75 0x00007f7a638a7897 in kdemain () from /usr/lib/kde4/libkdeinit/libkdeinit4_plasma-desktop.so
#76 0x00007f7a634f3eff in __libc_start_main (main=0x400740 <_start+256>, argc=1, ubp_av=0x7fff128e55e8, init=<value optimized out>, fini=<value optimized out>, rtld_fini=<value optimized out>, stack_end=0x7fff128e55d8) at libc-start.c:226
#77 0x0000000000400669 in _start ()


Reproducible: Didn't try