Application that crashed: kwin
Version of the application: 4.3.3 (KDE 4.3.3)
KDE Version: 4.3.3 (KDE 4.3.3)
Qt Version: 4.5.3
Operating System: Linux 2.6.31-ARCH i686

What I was doing when the application crashed:
I opened a folder in a Konqueror tab and Kwin crashed (Konqueror also crashed, see here: https://bugs.kde.org/show_bug.cgi?id=216081). For some seconds (4
at least) the plasma panel dissapeared and after reappeared.

 -- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
[KCrash Handler]
#6  0xb6f8014a in KCommonDecoration::widget (this=0x90d0508) at /home/phil/kdemod/core/kdebase-workspace/src/kdebase-workspace-4.3.3/kwin/lib/kcommondecoration.cpp:1164
#7  0xb62908fc in QApplicationPrivate::notify_helper (this=0x90d0508, receiver=0x9332228, e=0x92907b8) at kernel/qapplication.cpp:4061
#8  0xb6297f5a in QApplication::notify (this=0xbfb14468, receiver=0x92018d8, e=0xbfb12814) at kernel/qapplication.cpp:4030
#9  0xb73b35ca in KApplication::notify (this=0xbfb14468, receiver=0x92018d8, event=0xbfb12814) at /home/phil/kdemod/core/kdelibs/src/kdelibs-4.3.3/kdeui/kernel/kapplication.cpp:302
#10 0xb773b3ff in KWin::Application::notify (this=0xbfb14468, o=0x92018d8, e=0xbfb12814) at /home/phil/kdemod/core/kdebase-workspace/src/kdebase-workspace-4.3.3/kwin/main.cpp:366
#11 0xb600d5bb in QCoreApplication::notifyInternal (this=0xbfb14468, receiver=0x92018d8, event=0xbfb12814) at kernel/qcoreapplication.cpp:610
#12 0xb62e3c0a in QCoreApplication::sendEvent (this=0x92907b8) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#13 QWidgetPrivate::hide_helper (this=0x92907b8) at kernel/qwidget.cpp:6847
#14 0xb62ec0d0 in QWidget::setVisible (this=0x92018d8, visible=false) at kernel/qwidget.cpp:7017
#15 0xb62e12d6 in QWidget::hide (this=0x92018d8, __in_chrg=<value optimized out>) at ../../include/QtGui/../../src/gui/kernel/qwidget.h:477
#16 ~QWidget (this=0x92018d8, __in_chrg=<value optimized out>) at kernel/qwidget.cpp:1348
#17 0xb6f7bc63 in ~KDecoration (this=0x9280a38, __in_chrg=<value optimized out>) at /home/phil/kdemod/core/kdebase-workspace/src/kdebase-workspace-4.3.3/kwin/lib/kdecoration.cpp:71
#18 0xb6f7bd18 in ~KDecorationUnstable (this=0x9280a38, __in_chrg=<value optimized out>) at /home/phil/kdemod/core/kdebase-workspace/src/kdebase-workspace-4.3.3/kwin/lib/kdecoration.cpp:394
#19 0xb6f850e9 in ~KCommonDecorationWrapper (this=0x9280a38, __in_chrg=<value optimized out>)
    at /home/phil/kdemod/core/kdebase-workspace/src/kdebase-workspace-4.3.3/kwin/lib/kcommondecoration_p.cpp:44
#20 0xb772fff5 in KWin::Client::destroyDecoration (this=0x94a1ab8) at /home/phil/kdemod/core/kdebase-workspace/src/kdebase-workspace-4.3.3/kwin/client.cpp:365
#21 0xb7730f6b in KWin::Client::releaseWindow (this=0x94a1ab8, on_shutdown=false) at /home/phil/kdemod/core/kdebase-workspace/src/kdebase-workspace-4.3.3/kwin/client.cpp:236
#22 0xb7752edd in KWin::Client::unmapNotifyEvent (this=0x94a1ab8, e=0xbfb140c0) at /home/phil/kdemod/core/kdebase-workspace/src/kdebase-workspace-4.3.3/kwin/events.cpp:796
#23 0xb7754634 in KWin::Client::windowEvent (this=0x94a1ab8, e=0xbfb140c0) at /home/phil/kdemod/core/kdebase-workspace/src/kdebase-workspace-4.3.3/kwin/events.cpp:642
#24 0xb7754df4 in KWin::Workspace::workspaceEvent (this=0x9202798, e=0xbfb140c0) at /home/phil/kdemod/core/kdebase-workspace/src/kdebase-workspace-4.3.3/kwin/events.cpp:305
#25 0xb773b442 in KWin::Application::x11EventFilter (this=0xbfb14468, e=0xbfb140c0) at /home/phil/kdemod/core/kdebase-workspace/src/kdebase-workspace-4.3.3/kwin/main.cpp:357
#26 0xb62f1eb0 in qt_x11EventFilter (ev=0xbfb140c0) at kernel/qapplication_x11.cpp:377
#27 0xb630309e in QApplication::x11ProcessEvent (this=0xbfb14468, event=0xbfb140c0) at kernel/qapplication_x11.cpp:3273
#28 0xb632efd2 in x11EventSourceDispatch (s=0x90d3770, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#29 0xb469d328 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#30 0xb46a0ba0 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#31 0xb46a0cd3 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#32 0xb6037d25 in QEventDispatcherGlib::processEvents (this=0x90d04e8, flags=...) at kernel/qeventdispatcher_glib.cpp:407
#33 0xb632e705 in QGuiEventDispatcherGlib::processEvents (this=0x90d04e8, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#34 0xb600bba9 in QEventLoop::processEvents (this=0xbfb143b4, flags=) at kernel/qeventloop.cpp:149
#35 0xb600bffa in QEventLoop::exec (this=0xbfb143b4, flags=...) at kernel/qeventloop.cpp:201
#36 0xb600e46f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#37 0xb62907a7 in QApplication::exec () at kernel/qapplication.cpp:3525
#38 0xb773dd64 in kdemain (argc=3, argv=0xbfb14664) at /home/phil/kdemod/core/kdebase-workspace/src/kdebase-workspace-4.3.3/kwin/main.cpp:522
#39 0x0804859b in main (argc=3, argv=0xbfb14664) at /home/phil/kdemod/core/kdebase-workspace/src/kdebase-workspace-4.3.3/kwin/kwin_dummy.cpp:3

Reported using DrKonqi