Application that crashed: kwin
Version of the application: 4.3.1 (KDE 4.3.1)
KDE Version: 4.3.1 (KDE 4.3.1)
Qt Version: 4.5.2
Operating System: Linux 2.6.28-15-generic x86_64
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
KWin suddenly crashed with desktop effects on.

Driver - fgrlx 9.9


 -- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
[KCrash Handler]
#5  WindowPaintData (this=0x7fffd09d28d0, w=0x180000401800002) at /build/buildd/kdebase-workspace-4.3.1/kwin/lib/kwineffects.cpp:76
#6  0x00007f3bba629ea9 in KWin::CoverSwitchEffect::paintWindows (this=0xc4aef0, windows=0xc4af78, left=false, reflectedWindows=<value optimized out>, additionalWindow=<value optimized out>)
    at /build/buildd/kdebase-workspace-4.3.1/kwin/effects/coverswitch/coverswitch.cpp:886
#7  0x00007f3bba62a7ae in KWin::CoverSwitchEffect::paintScene (this=0xc4aef0, frontWindow=0xd475e0, leftWindows=0xc4af70, rightWindows=0xc4af78, reflectedWindows=<value optimized out>)
    at /build/buildd/kdebase-workspace-4.3.1/kwin/effects/coverswitch/coverswitch.cpp:454
#8  0x00007f3bba6309bb in KWin::CoverSwitchEffect::paintScreen (this=0xc4aef0, mask=0, region=
        {d = 0x7fffd09d2d10, static shared_empty = {ref = {_q_value = 371}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, data=<value optimized out>)
    at /build/buildd/kdebase-workspace-4.3.1/kwin/effects/coverswitch/coverswitch.cpp:308
#9  0x00007f3bc858a137 in KWin::EffectsHandlerImpl::paintScreen (this=0xb6e510, mask=32, region=
        {d = 0x7fffd09d2d60, static shared_empty = {ref = {_q_value = 371}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, data=@0x7fffd09d2fb0)
    at /build/buildd/kdebase-workspace-4.3.1/kwin/effects.cpp:122
#10 0x00007f3bc80ab660 in KWin::Effect::paintScreen (this=<value optimized out>, mask=32, region=<value optimized out>, data=@0x7fffd09d2fb0)
    at /build/buildd/kdebase-workspace-4.3.1/kwin/lib/kwineffects.cpp:206
#11 0x00007f3bc858a137 in KWin::EffectsHandlerImpl::paintScreen (this=0xb6e510, mask=32, region=
        {d = 0x7fffd09d2e10, static shared_empty = {ref = {_q_value = 371}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, data=@0x7fffd09d2fb0)
    at /build/buildd/kdebase-workspace-4.3.1/kwin/effects.cpp:122
#12 0x00007f3bc80ab660 in KWin::Effect::paintScreen (this=<value optimized out>, mask=32, region=<value optimized out>, data=@0x7fffd09d2fb0)
    at /build/buildd/kdebase-workspace-4.3.1/kwin/lib/kwineffects.cpp:206
#13 0x00007f3bc858a137 in KWin::EffectsHandlerImpl::paintScreen (this=0xb6e510, mask=32, region=
        {d = 0x7fffd09d2ed0, static shared_empty = {ref = {_q_value = 371}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, data=@0x7fffd09d2fb0)
    at /build/buildd/kdebase-workspace-4.3.1/kwin/effects.cpp:122
#14 0x00007f3bba627c65 in KWin::ZoomEffect::paintScreen (this=<value optimized out>, mask=32, region=
        {d = 0x7fffd09d2f40, static shared_empty = {ref = {_q_value = 371}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, data=@0x7fffd09d2fb0)
    at /build/buildd/kdebase-workspace-4.3.1/kwin/effects/zoom/zoom.cpp:73
#15 0x00007f3bc858a137 in KWin::EffectsHandlerImpl::paintScreen (this=0xb6e510, mask=32, region=
        {d = 0x7fffd09d3030, static shared_empty = {ref = {_q_value = 371}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, data=@0x7fffd09d2fb0)
    at /build/buildd/kdebase-workspace-4.3.1/kwin/effects.cpp:122
#16 0x00007f3bc857573c in KWin::Scene::paintScreen (this=0xb69140, mask=0x7fffd09d313c, region=0x7fffd09d3250) at /build/buildd/kdebase-workspace-4.3.1/kwin/scene.cpp:134
#17 0x00007f3bc85842ef in KWin::SceneOpenGL::paint (this=0xb69140, damage={d = 0x7fffd09d3250, static shared_empty = {ref = {_q_value = 371}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, 
    toplevels=<value optimized out>) at /build/buildd/kdebase-workspace-4.3.1/kwin/scene_opengl.cpp:746
#18 0x00007f3bc85708e2 in KWin::Workspace::performCompositing (this=0xb3b840) at /build/buildd/kdebase-workspace-4.3.1/kwin/composite.cpp:420
#19 0x00007f3bc850bf5a in KWin::Workspace::qt_metacall (this=0xb3b840, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffd09d33e0)
    at /build/buildd/kdebase-workspace-4.3.1/obj-x86_64-linux-gnu/kwin/workspace.moc:473
#20 0x00007f3bc5c47ea2 in QMetaObject::activate (sender=0xb3bc68, from_signal_index=<value optimized out>, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3113
#21 0x00007f3bc5c42263 in QObject::event (this=0xb3bc68, e=0x180000401800002) at kernel/qobject.cpp:1075
#22 0x00007f3bc633bf4d in QApplicationPrivate::notify_helper (this=0xa56900, receiver=0xb3bc68, e=0x7fffd09d3a90) at kernel/qapplication.cpp:4056
#23 0x00007f3bc634418a in QApplication::notify (this=0x7fffd09d3e00, receiver=0xb3bc68, e=0x7fffd09d3a90) at kernel/qapplication.cpp:4021
#24 0x00007f3bc787ddeb in KApplication::notify (this=0x7fffd09d3e00, receiver=0xb3bc68, event=0x7fffd09d3a90) at /build/buildd/kde4libs-4.3.1/kdeui/kernel/kapplication.cpp:302
#25 0x00007f3bc5c326ac in QCoreApplication::notifyInternal (this=0x7fffd09d3e00, receiver=0xb3bc68, event=0x7fffd09d3a90) at kernel/qcoreapplication.cpp:610
#26 0x00007f3bc5c5f516 in QTimerInfoList::activateTimers (this=0xa5a660) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#27 0x00007f3bc5c5bb2d in timerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:165
#28 0x00007f3bbf12720a in IA__g_main_context_dispatch (context=0xa59520) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:1814
#29 0x00007f3bbf12a8e0 in g_main_context_iterate (context=0xa59520, block=1, dispatch=1, self=<value optimized out>) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2448
#30 0x00007f3bbf12aa7c in IA__g_main_context_iteration (context=0xa59520, may_block=1) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2511
#31 0x00007f3bc5c5ba8f in QEventDispatcherGlib::processEvents (this=0xa3d950, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#32 0x00007f3bc63d4bdf in QGuiEventDispatcherGlib::processEvents (this=0x180000401800002, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#33 0x00007f3bc5c30f42 in QEventLoop::processEvents (this=<value optimized out>, flags={i = -795001600}) at kernel/qeventloop.cpp:149
#34 0x00007f3bc5c31314 in QEventLoop::exec (this=0x7fffd09d3d40, flags={i = -795001520}) at kernel/qeventloop.cpp:201
#35 0x00007f3bc5c335e4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#36 0x00007f3bc8524278 in kdemain (argc=3, argv=0x7fffd09d42e8) at /build/buildd/kdebase-workspace-4.3.1/kwin/main.cpp:522
#37 0x00007f3bc326f5a6 in __libc_start_main (main=0x4008c0 <main>, argc=3, ubp_av=0x7fffd09d42e8, init=0x4008f0 <__libc_csu_init>, fini=<value optimized out>, rtld_fini=<value optimized out>, 
    stack_end=0x7fffd09d42d8) at libc-start.c:220
#38 0x00000000004007f9 in _start () at ../sysdeps/x86_64/elf/start.S:113

Reported using DrKonqi