looks like a duplicate of our alt+tab crashes when a window is closed, although this is a different backtrace.

Indeed it looks related to bug 203286 or bug 187761.
Regards

That might sound strange: please retest with 4.4 as flipswitch has been reimplemented.

I will test KDE 4.4 but it will take me some days because I need to compile it and I'm quite busy this week. I will comment the results here as soon as possible.


Thanks

I've been doing some tests with KDE 4.3.66 and the problem seems to be solved.

I saw that you changed the behavior of the effect. Now when the new window appear while using Alt-Tab the previous window hides. I mean only the new window is shown. If this is the correct behavior I will do some more tests and if in a couple of days I get no crash, I will close the bug.

Thanks

After doing some more tests I've not been able to reproduce this crash anymore with the flipswitch effect but with the Cover flow effect.

To reproduce it with the cover flow effect I do the following:

1- Open Ksnake
2- Drive the snake to the wall so the Records window appear.
3- Press Alt+tab before snake crashes to the wall, and hold it till KWin crashes.

I've only made it crash if I hold Alt+tab with the Ksnake window in the main position. I will attach a picture now to explain it better.

I will attach a new backtrace as soon as posible.

Thanks

Created attachment 36867 [details]
Coverflow position to make kwin crash

And here is a new backtrace:

Application: KWin (kwin), signal: Segmentation fault
[KCrash Handler]
#6  WindowPaintData (this=0xbfecb5c0, w=0x1) at /usr/src/debug/kdebase-workspace-4.3.66svn1016707/kwin/lib/kwineffects.cpp:76
#7  0xb31808d7 in KWin::CoverSwitchEffect::paintFrontWindow (this=0x81cd720, frontWindow=0x1, width=1280, leftWindows=0, rightWindows=0, reflectedWindow=true)
    at /usr/src/debug/kdebase-workspace-4.3.66svn1016707/kwin/effects/coverswitch/coverswitch.cpp:792
#8  0xb31818e7 in KWin::CoverSwitchEffect::paintScene (this=0x81cd720, frontWindow=0x1, leftWindows=0x81cd780, rightWindows=0x81cd784, reflectedWindows=true)
    at /usr/src/debug/kdebase-workspace-4.3.66svn1016707/kwin/effects/coverswitch/coverswitch.cpp:429
#9  0xb3188a85 in KWin::CoverSwitchEffect::paintScreen (this=0x81cd720, mask=32, region={d = 0xbfecb888, static shared_empty = {ref = {_q_value = 300}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, 
    data=@0xbfecb9e8) at /usr/src/debug/kdebase-workspace-4.3.66svn1016707/kwin/effects/coverswitch/coverswitch.cpp:248
#10 0xb7fdffcf in KWin::EffectsHandlerImpl::paintScreen (this=0x81458f8, mask=32, region={d = 0xbfecb8c8, static shared_empty = {ref = {_q_value = 300}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, 
    data=@0xbfecb9e8) at /usr/src/debug/kdebase-workspace-4.3.66svn1016707/kwin/effects.cpp:122
#11 0xb7f00b66 in KWin::Effect::paintScreen (this=0x81ccbc8, mask=32, region={d = 0xbfecb908, static shared_empty = {ref = {_q_value = 300}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, 
    data=@0xbfecb9e8) at /usr/src/debug/kdebase-workspace-4.3.66svn1016707/kwin/lib/kwineffects.cpp:206
#12 0xb7fdffcf in KWin::EffectsHandlerImpl::paintScreen (this=0x81458f8, mask=32, region={d = 0xbfecb95c, static shared_empty = {ref = {_q_value = 300}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, 
    data=@0xbfecb9e8) at /usr/src/debug/kdebase-workspace-4.3.66svn1016707/kwin/effects.cpp:122
#13 0xb317edad in KWin::ZoomEffect::paintScreen (this=0x8193898, mask=32, region={d = 0xbfecb9a8, static shared_empty = {ref = {_q_value = 300}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, 
    data=@0xbfecb9e8) at /usr/src/debug/kdebase-workspace-4.3.66svn1016707/kwin/effects/zoom/zoom.cpp:73
#14 0xb7fdffcf in KWin::EffectsHandlerImpl::paintScreen (this=0x81458f8, mask=32, region={d = 0xbfecba40, static shared_empty = {ref = {_q_value = 300}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, 
    data=@0xbfecb9e8) at /usr/src/debug/kdebase-workspace-4.3.66svn1016707/kwin/effects.cpp:122
#15 0xb7fc9e00 in KWin::Scene::paintScreen (this=0x812fd80, mask=0xbfecbac4, region=0xbfecbb84) at /usr/src/debug/kdebase-workspace-4.3.66svn1016707/kwin/scene.cpp:134
#16 0xb7fd9c3a in KWin::SceneOpenGL::paint (this=0x812fd80, damage={d = 0xbfecbb84, static shared_empty = {ref = {_q_value = 300}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, toplevels=
        {{p = {static shared_null = {ref = {_q_value = 14011}, alloc = 0, begin = 0, end = 0, sharable = 1, array = {0x0}}, d = 0xbfecbb80}, d = 0xbfecbb80}})
    at /usr/src/debug/kdebase-workspace-4.3.66svn1016707/kwin/scene_opengl.cpp:746
#17 0xb7fc4dbb in KWin::Workspace::performCompositing (this=0x812f7d8) at /usr/src/debug/kdebase-workspace-4.3.66svn1016707/kwin/composite.cpp:420
#18 0xb7f57b9d in KWin::Workspace::qt_metacall (this=0x812f7d8, _c=QMetaObject::InvokeMetaMethod, _id=149, _a=0xbfecbc58)
    at /usr/src/debug/kdebase-workspace-4.3.66svn1016707/build/kwin/workspace.moc:473
#19 0xb6b26788 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#20 0xb6b27412 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#21 0xb6b62fe7 in QTimer::timeout() () from /usr/lib/libQtCore.so.4
#22 0xb6b2cc0e in QTimer::timerEvent(QTimerEvent*) () from /usr/lib/libQtCore.so.4
#23 0xb6b2172f in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#24 0xb6d9c7bc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#25 0xb6da4aae in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#26 0xb7abcefd in KApplication::notify (this=0xbfecc41c, receiver=0x812fa3c, event=0xbfecc120) at /usr/src/debug/kdelibs-4.3.66svn1016707/kdeui/kernel/kapplication.cpp:302
#27 0xb7f6efbd in KWin::Application::notify (this=0xbfecc41c, o=0x812fa3c, e=0xbfecc120) at /usr/src/debug/kdebase-workspace-4.3.66svn1016707/kwin/main.cpp:366
#28 0xb6b1116b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#29 0xb6b405f6 in ?? () from /usr/lib/libQtCore.so.4
#30 0xb6b3c980 in ?? () from /usr/lib/libQtCore.so.4
#31 0xb4df19c8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#32 0xb4df5083 in ?? () from /usr/lib/libglib-2.0.so.0
#33 0xb4df5241 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#34 0xb6b3c8d8 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#35 0xb6e3cca5 in ?? () from /usr/lib/libQtGui.so.4
#36 0xb6b0f78a in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#37 0xb6b0fbd2 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#38 0xb6b12079 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#39 0xb6d9c637 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#40 0xb7f70ad3 in kdemain (argc=3, argv=0xbfecc604) at /usr/src/debug/kdebase-workspace-4.3.66svn1016707/kwin/main.cpp:522
#41 0x080487c2 in main (argc=9987080, argv=0xb7cc6ab0) at /usr/src/debug/kdebase-workspace-4.3.66svn1016707/build/kwin/kwin_dummy.cpp:3

this is apparently fixed with recent svn updates as well
just recompiled, tested around the version change, got a segfault before and only an "wrong" (the record isn't displayd) window list after - and i recall Martin lately pushed some coverswitch fix, likely r1016998

Then if you say this is fixed you can close this report.

Thank you very much

(In reply to comment #10)
> Then if you say this is fixed you can close this report.
> 
> Thank you very much
yes it is fixed. I just tested and even the display list is correct with latest svn ;-)