Application that crashed: kwin
Version of the application: 4.3.2 (KDE 4.3.2)
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-14-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
I just closed some windows and it just happend
I'm using RTL (Hebrew) Desktop on Kubuntu 9.10

 -- Backtrace:
Application: מנהל החלונות (kwin), signal: Segmentation fault
[KCrash Handler]
#6  WindowPaintData (this=0xbfbe8cd0, w=0x1) at ../../../kwin/lib/kwineffects.cpp:76
#7  0x01556917 in KWin::CoverSwitchEffect::paintFrontWindow (this=0x8665038, frontWindow=0x1, width=1280, leftWindows=0, rightWindows=0, reflectedWindow=false)
    at ../../../kwin/effects/coverswitch/coverswitch.cpp:801
#8  0x01557c28 in KWin::CoverSwitchEffect::paintScene (this=0x8665038, frontWindow=0x1, leftWindows=..., rightWindows=..., reflectedWindows=false)
    at ../../../kwin/effects/coverswitch/coverswitch.cpp:436
#9  0x0155e1f3 in KWin::CoverSwitchEffect::paintScreen (this=0x8665038, mask=32, region=..., data=...) at ../../../kwin/effects/coverswitch/coverswitch.cpp:308
#10 0x00494a90 in KWin::EffectsHandlerImpl::paintScreen (this=0x8595238, mask=32, region=..., data=...) at ../../kwin/effects.cpp:122
#11 0x0033cc66 in KWin::Effect::paintScreen (this=0x86024e8, mask=32, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:206
#12 0x00494a90 in KWin::EffectsHandlerImpl::paintScreen (this=0x8595238, mask=32, region=..., data=...) at ../../kwin/effects.cpp:122
#13 0x01554dd3 in KWin::ZoomEffect::paintScreen (this=0x86641d8, mask=32, region=..., data=...) at ../../../kwin/effects/zoom/zoom.cpp:73
#14 0x00494a90 in KWin::EffectsHandlerImpl::paintScreen (this=0x8595238, mask=32, region=..., data=...) at ../../kwin/effects.cpp:122
#15 0x0047d604 in KWin::Scene::paintScreen (this=0x85954d8, mask=0xbfbe9218, region=0xbfbe92d8) at ../../kwin/scene.cpp:134
#16 0x0048d213 in KWin::SceneOpenGL::paint (this=0x85954d8, damage=..., toplevels=...) at ../../kwin/scene_opengl.cpp:746
#17 0x00478cd1 in KWin::Workspace::performCompositing (this=0x8587098) at ../../kwin/composite.cpp:420
#18 0x0040779a in KWin::Workspace::qt_metacall (this=0x8587098, _c=QMetaObject::InvokeMetaMethod, _id=153, _a=0xbfbe93cc) at ./workspace.moc:473
#19 0x011a0263 in QMetaObject::activate (sender=0x85872fc, from_signal_index=4, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3113
#20 0x011a0ec2 in QMetaObject::activate (sender=0x85872fc, m=0x127b904, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3187
#21 0x011da667 in QTimer::timeout (this=0x85872fc) at .moc/release-shared/moc_qtimer.cpp:128
#22 0x011a59ae in QTimer::timerEvent (this=0x85872fc, e=0xbfbe9880) at kernel/qtimer.cpp:261
#23 0x0119a3bf in QObject::event (this=0x85872fc, e=0xbfbe9880) at kernel/qobject.cpp:1075
#24 0x06e98f54 in QApplicationPrivate::notify_helper (this=0x849bb30, receiver=0x85872fc, e=0xbfbe9880) at kernel/qapplication.cpp:4056
#25 0x06ea067c in QApplication::notify (this=0xbfbe9bf8, receiver=0x85872fc, e=0xbfbe9880) at kernel/qapplication.cpp:3603
#26 0x00866bfa in KApplication::notify (this=0xbfbe9bf8, receiver=0x85872fc, event=0xbfbe9880) at ../../kdeui/kernel/kapplication.cpp:302
#27 0x0041d46f in KWin::Application::notify (this=0xbfbe9bf8, o=0x85872fc, e=0xbfbe9880) at ../../kwin/main.cpp:366
#28 0x0118a6cb in QCoreApplication::notifyInternal (this=0xbfbe9bf8, receiver=0x85872fc, event=0xbfbe9880) at kernel/qcoreapplication.cpp:610
#29 0x011b77ce in QCoreApplication::sendEvent (this=0x849ed34) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#30 QTimerInfoList::activateTimers (this=0x849ed34) at kernel/qeventdispatcher_unix.cpp:572
#31 0x011b50e0 in timerSourceDispatch (source=0x849ed00) at kernel/qeventdispatcher_glib.cpp:165
#32 0x03041e78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#33 0x03045720 in ?? () from /lib/libglib-2.0.so.0
#34 0x03045853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#35 0x011b502c in QEventDispatcherGlib::processEvents (this=0x8485b68, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#36 0x06f39be5 in QGuiEventDispatcherGlib::processEvents (this=0x8485b68, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#37 0x01188c79 in QEventLoop::processEvents (this=0xbfbe9b44, flags=) at kernel/qeventloop.cpp:149
#38 0x011890ca in QEventLoop::exec (this=0xbfbe9b44, flags=...) at kernel/qeventloop.cpp:201
#39 0x0118b53f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#40 0x06e98dd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#41 0x00420034 in kdemain (argc=3, argv=0xbfbe9df4) at ../../kwin/main.cpp:522
#42 0x080485cb in main (argc=3, argv=0xbfbe9df4) at kwin_dummy.cpp:3

Reported using DrKonqi