Confirmed on kde4.2.2 on debian sid Qt4.5.1, intel 965 with 2.7.0 xorg drivers and Linux 2.6.29.2

I can't reproduce it easilty, but I was doing alt-tab just after having change tab in konqueror.

Regards,

*** Bug 195797 has been marked as a duplicate of this bug. ***

I am experiencing the same problem on KDE 4.2.4 (Kubuntu). Before the crash happened I started copying some files using Dolphin and then hit Alt+Tab.

Application: KWin (kwin), signal SIGSEGV
0x00007fdecca47cf0 in __nanosleep_nocancel () from /lib/libc.so.6
Current language:  auto; currently c

Thread 1 (Thread 0x7fded1de6790 (LWP 18560)):
[KCrash Handler]
#5  0x00007fdec4780fd4 in KWin::FlipSwitchEffect::paintScreen (this=0xda52a0, mask=<value optimized out>, region=
        {d = 0x7fffd9f2c9a0, static shared_empty = {ref = {_q_value = 302}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, data=<value optimized out>)
    at /build/buildd/kdebase-workspace-4.2.4/kwin/effects/flipswitch.cpp:199
#6  0x00007fded1ae5d27 in KWin::EffectsHandlerImpl::paintScreen (this=0x9d6880, mask=32, region=
        {d = 0x7fffd9f2cb90, static shared_empty = {ref = {_q_value = 302}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, data=@0x7fffd9f2d580)
    at /build/buildd/kdebase-workspace-4.2.4/kwin/effects.cpp:122
#7  0x00007fdec476460e in KWin::SlideEffect::paintScreen (this=0x919270, mask=32, region=
        {d = 0x7fffd9f2cc10, static shared_empty = {ref = {_q_value = 302}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, data=@0x7fffd9f2d580)
    at /build/buildd/kdebase-workspace-4.2.4/kwin/effects/slide.cpp:86
#8  0x00007fded1ae5d27 in KWin::EffectsHandlerImpl::paintScreen (this=0x9d6880, mask=32, region=
        {d = 0x7fffd9f2ce80, static shared_empty = {ref = {_q_value = 302}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, data=@0x7fffd9f2d580)
    at /build/buildd/kdebase-workspace-4.2.4/kwin/effects.cpp:122
#9  0x00007fdec4778127 in KWin::CubeEffect::paintScreen (this=0x919df0, mask=32, region=
        {d = 0x7fffd9f2cfc0, static shared_empty = {ref = {_q_value = 302}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, data=@0x7fffd9f2d580)
    at /build/buildd/kdebase-workspace-4.2.4/kwin/effects/cube.cpp:407
#10 0x00007fded1ae5d27 in KWin::EffectsHandlerImpl::paintScreen (this=0x9d6880, mask=32, region=
        {d = 0x7fffd9f2d010, static shared_empty = {ref = {_q_value = 302}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, data=@0x7fffd9f2d580)
    at /build/buildd/kdebase-workspace-4.2.4/kwin/effects.cpp:122
#11 0x00007fded161a7e0 in KWin::Effect::paintScreen (this=<value optimized out>, mask=32, region=<value optimized out>, data=@0x7fffd9f2d580)
    at /build/buildd/kdebase-workspace-4.2.4/kwin/lib/kwineffects.cpp:199
#12 0x00007fded1ae5d27 in KWin::EffectsHandlerImpl::paintScreen (this=0x9d6880, mask=32, region=
        {d = 0x7fffd9f2d0c0, static shared_empty = {ref = {_q_value = 302}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, data=@0x7fffd9f2d580)
    at /build/buildd/kdebase-workspace-4.2.4/kwin/effects.cpp:122
#13 0x00007fded161a7e0 in KWin::Effect::paintScreen (this=<value optimized out>, mask=32, region=<value optimized out>, data=@0x7fffd9f2d580)
    at /build/buildd/kdebase-workspace-4.2.4/kwin/lib/kwineffects.cpp:199
#14 0x00007fded1ae5d27 in KWin::EffectsHandlerImpl::paintScreen (this=0x9d6880, mask=32, region=
        {d = 0x7fffd9f2d170, static shared_empty = {ref = {_q_value = 302}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, data=@0x7fffd9f2d580)
    at /build/buildd/kdebase-workspace-4.2.4/kwin/effects.cpp:122
#15 0x00007fded161a7e0 in KWin::Effect::paintScreen (this=<value optimized out>, mask=32, region=<value optimized out>, data=@0x7fffd9f2d580)
    at /build/buildd/kdebase-workspace-4.2.4/kwin/lib/kwineffects.cpp:199
#16 0x00007fded1ae5d27 in KWin::EffectsHandlerImpl::paintScreen (this=0x9d6880, mask=32, region=
        {d = 0x7fffd9f2d220, static shared_empty = {ref = {_q_value = 302}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, data=@0x7fffd9f2d580)
    at /build/buildd/kdebase-workspace-4.2.4/kwin/effects.cpp:122
#17 0x00007fded161a7e0 in KWin::Effect::paintScreen (this=<value optimized out>, mask=32, region=<value optimized out>, data=@0x7fffd9f2d580)
    at /build/buildd/kdebase-workspace-4.2.4/kwin/lib/kwineffects.cpp:199
#18 0x00007fded1ae5d27 in KWin::EffectsHandlerImpl::paintScreen (this=0x9d6880, mask=32, region=
        {d = 0x7fffd9f2d2d0, static shared_empty = {ref = {_q_value = 302}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, data=@0x7fffd9f2d580)
    at /build/buildd/kdebase-workspace-4.2.4/kwin/effects.cpp:122
#19 0x00007fded161a7e0 in KWin::Effect::paintScreen (this=<value optimized out>, mask=32, region=<value optimized out>, data=@0x7fffd9f2d580)
    at /build/buildd/kdebase-workspace-4.2.4/kwin/lib/kwineffects.cpp:199
#20 0x00007fded1ae5d27 in KWin::EffectsHandlerImpl::paintScreen (this=0x9d6880, mask=32, region=
        {d = 0x7fffd9f2d4a0, static shared_empty = {ref = {_q_value = 302}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, data=@0x7fffd9f2d580)
    at /build/buildd/kdebase-workspace-4.2.4/kwin/effects.cpp:122
#21 0x00007fdec473b501 in KWin::DimScreenEffect::paintScreen (this=0xd91820, mask=32, region=<value optimized out>, data=@0x7fffd9f2d580)
    at /build/buildd/kdebase-workspace-4.2.4/kwin/effects/dimscreen.cpp:60
#22 0x00007fded1ae5d27 in KWin::EffectsHandlerImpl::paintScreen (this=0x9d6880, mask=32, region=
        {d = 0x7fffd9f2d600, static shared_empty = {ref = {_q_value = 302}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, data=@0x7fffd9f2d580)
    at /build/buildd/kdebase-workspace-4.2.4/kwin/effects.cpp:122
#23 0x00007fded1ad3c2c in KWin::Scene::paintScreen (this=0x9db570, mask=0x7fffd9f2d6fc, region=0x7fffd9f2d800) at /build/buildd/kdebase-workspace-4.2.4/kwin/scene.cpp:133
#24 0x00007fded1adf0af in KWin::SceneOpenGL::paint (this=0x9db570, damage={d = 0x7fffd9f2d800, static shared_empty = {ref = {_q_value = 302}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, 
    toplevels=<value optimized out>) at /build/buildd/kdebase-workspace-4.2.4/kwin/scene_opengl.cpp:724
#25 0x00007fded1acf334 in KWin::Workspace::performCompositing (this=0x9aa140) at /build/buildd/kdebase-workspace-4.2.4/kwin/composite.cpp:384
#26 0x00007fded1a742fa in KWin::Workspace::qt_metacall (this=0x9aa140, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fffd9f2d990)
    at /build/buildd/kdebase-workspace-4.2.4/obj-x86_64-linux-gnu/kwin/workspace.moc:446
#27 0x00007fdecf5961f2 in QMetaObject::activate (sender=0x9aa548, from_signal_index=<value optimized out>, to_signal_index=4, argv=0x3) at kernel/qobject.cpp:3069
#28 0x00007fdecf5904d3 in QObject::event (this=0x9aa548, e=0xd4fb40) at kernel/qobject.cpp:1082
#29 0x00007fdecfcc578d in QApplicationPrivate::notify_helper (this=0x74bd90, receiver=0x9aa548, e=0x7fffd9f2e040) at kernel/qapplication.cpp:4084
#30 0x00007fdecfccd97a in QApplication::notify (this=0x7fffd9f2e3b0, receiver=0x9aa548, e=0x7fffd9f2e040) at kernel/qapplication.cpp:4049
#31 0x00007fded121b84b in KApplication::notify (this=0x7fffd9f2e3b0, receiver=0x9aa548, event=0x7fffd9f2e040) at /build/buildd/kde4libs-4.2.4/kdeui/kernel/kapplication.cpp:307
#32 0x00007fdecf58075c in QCoreApplication::notifyInternal (this=0x7fffd9f2e3b0, receiver=0x9aa548, event=0x7fffd9f2e040) at kernel/qcoreapplication.cpp:602
#33 0x00007fdecf5ad7f6 in QTimerInfoList::activateTimers (this=0x74f940) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#34 0x00007fdecf5a9f0d in timerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:164
#35 0x00007fdecae4b20a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#36 0x00007fdecae4e8e0 in ?? () from /usr/lib/libglib-2.0.so.0
#37 0x00007fdecae4ea7c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#38 0x00007fdecf5a9e6f in QEventDispatcherGlib::processEvents (this=0x738140, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:323
#39 0x00007fdecfd5dbef in QGuiEventDispatcherGlib::processEvents (this=0x91f4c0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#40 0x00007fdecf57f002 in QEventLoop::processEvents (this=<value optimized out>, flags={i = -638393680}) at kernel/qeventloop.cpp:149
#41 0x00007fdecf57f3cd in QEventLoop::exec (this=0x7fffd9f2e2f0, flags={i = -638393600}) at kernel/qeventloop.cpp:200
#42 0x00007fdecf581694 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880
#43 0x00007fded1a8b9ef in kdemain (argc=3, argv=0x7fffd9f2e888) at /build/buildd/kdebase-workspace-4.2.4/kwin/main.cpp:519
#44 0x00007fdecc9be5a6 in __libc_start_main (main=0x4008b0 <main>, argc=3, ubp_av=0x7fffd9f2e888, init=0x4008e0 <__libc_csu_init>, fini=<value optimized out>, rtld_fini=<value optimized out>, 
    stack_end=0x7fffd9f2e878) at libc-start.c:220
#45 0x00000000004007e9 in _start () at ../sysdeps/x86_64/elf/start.S:113

SVN commit 1000437 by graesslin:

Complete rewrite of flip switch.
 * no more usage of OpenGL directly. Only highlevel API (except multiscreen :-()
 * better animations by adjusting the TimeLine's curve shape
 * new configuration options for window positions
 * Usage without tabbox (also supporting electric border)
 * Effect Frame showing the window title
 * many more things I have forgotten to mention
BUG: 187761

 M  +866 -452  effects/flipswitch/flipswitch.cpp  
 M  +74 -19    effects/flipswitch/flipswitch.h  
 M  +44 -19    effects/flipswitch/flipswitch_config.cpp  
 M  +4 -1      effects/flipswitch/flipswitch_config.h  
 M  +196 -32   effects/flipswitch/flipswitch_config.ui  
 M  +6 -5      kcmkwin/kwincompositing/main.cpp  
 M  +46 -0     kcmkwin/kwinscreenedges/main.cpp  
 M  +3 -1      kcmkwin/kwinscreenedges/main.h  


WebSVN link: http://websvn.kde.org/?view=rev&revision=1000437

*** Bug 208725 has been marked as a duplicate of this bug. ***

*** Bug 216545 has been marked as a duplicate of this bug. ***

*** Bug 216555 has been marked as a duplicate of this bug. ***

*** Bug 217504 has been marked as a duplicate of this bug. ***