Application: kwin (4.3.95 (KDE 4.3.95 (KDE 4.4 RC2)))
KDE Platform Version: 4.3.95 (KDE 4.3.95 (KDE 4.4 RC2))
Qt Version: 4.6.0
Operating System: Linux 2.6.32-11-generic i686
Distribution: Ubuntu lucid (development branch)

-- Information about the crash:
I upgraded to the latest kde rc and my window decoration was gone when I tryed to change thet with ALT+F3 and the Option to undo that. kwan crashed and dad at again is I tryed it an other time.

The crash can be reproduced every time.

 -- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
[KCrash Handler]
#6  0x005ec76b in KDecoration::widget (this=0x9a4d9c0, check_workspace_pos=true, force=false) at ../../kwin/lib/kdecoration.h:1026
#7  KWin::Client::updateDecoration (this=0x9a4d9c0, check_workspace_pos=true, force=false) at ../../kwin/client.cpp:370
#8  0x005ecb0c in KWin::Client::setNoBorder (this=0x9a4d9c0, set=false) at ../../kwin/client.cpp:709
#9  0x0064509a in KWin::Workspace::performWindowOperation (this=0x9461628, c=0x9a4d9c0, op=KDecorationDefines::NoBorderOp) at ../../kwin/useractions.cpp:716
#10 0x006455bd in KWin::Workspace::clientPopupActivated (this=0x9461628, action=0x99915a8) at ../../kwin/useractions.cpp:660
#11 0x005df447 in KWin::Workspace::qt_metacall (this=0x9461628, _c=QMetaObject::InvokeMetaMethod, _id=158, _a=0xbfe8d9a8) at ./workspace.moc:520
#12 0x031f995a in QMetaObject::metacall (object=0x9461628, cl=3219707184, idx=158, argv=0xbfe8d9a8) at kernel/qmetaobject.cpp:237
#13 0x032080db in QMetaObject::activate (sender=0x995a788, m=0x4aca788, local_signal_index=2, argv=0xbfe8d9a8) at kernel/qobject.cpp:3294
#14 0x0463ba13 in QMenu::triggered (this=0x995a788, _t1=0x99915a8) at .moc/release-shared/moc_qmenu.cpp:164
#15 0x0463ce9f in QMenuPrivate::activateCausedStack (this=0x98823c8, causedStack=..., action=0x99915a8, action_e=QAction::Trigger, self=true) at widgets/qmenu.cpp:1004
#16 0x0464323b in QMenuPrivate::activateAction (this=0x98823c8, action=0x99915a8, action_e=QAction::Trigger, self=<value optimized out>) at widgets/qmenu.cpp:1086
#17 0x04644277 in QMenu::mouseReleaseEvent (this=0x9afa050, e=0xbfe8e0f0) at widgets/qmenu.cpp:2307
#18 0x041fff6e in QWidget::event (this=0x9afa050, event=0xbfe8e0f0) at kernel/qwidget.cpp:7974
#19 0x04645904 in QMenu::event (this=0x9afa050, e=0xbfe8e0f0) at widgets/qmenu.cpp:2406
#20 0x041a31dc in QApplicationPrivate::notify_helper (this=0x93cd9a8, receiver=0x9afa050, e=0xbfe8e0f0) at kernel/qapplication.cpp:4242
#21 0x041aa7ab in QApplication::notify (this=0xbfe8f8f8, receiver=0x9afa050, e=0xbfe8e0f0) at kernel/qapplication.cpp:3822
#22 0x00cf96fa in KApplication::notify (this=0xbfe8f8f8, receiver=0x9afa050, event=0xbfe8e0f0) at ../../kdeui/kernel/kapplication.cpp:302
#23 0x005f8c9f in KWin::Application::notify (this=0xbfe8f8f8, o=0x9afa050, e=0xbfe8e0f0) at ../../kwin/main.cpp:370
#24 0x031f46fb in QCoreApplication::notifyInternal (this=0xbfe8f8f8, receiver=0x9afa050, event=0xbfe8e0f0) at kernel/qcoreapplication.cpp:704
#25 0x041a9762 in QCoreApplication::sendEvent (receiver=0x9afa050, event=0xbfe8e0f0, alienWidget=0x0, nativeWidget=0x9afa050, buttonDown=0x4adf060, lastMouseReceiver=..., spontaneous=true)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#26 QApplicationPrivate::sendMouseEvent (receiver=0x9afa050, event=0xbfe8e0f0, alienWidget=0x0, nativeWidget=0x9afa050, buttonDown=0x4adf060, lastMouseReceiver=..., spontaneous=true)
    at kernel/qapplication.cpp:2956
#27 0x042331a7 in QETWidget::translateMouseEvent (this=0x9afa050, event=0xbfe8e60c) at kernel/qapplication_x11.cpp:4302
#28 0x042321b1 in QApplication::x11ProcessEvent (this=0xbfe8f8f8, event=0xbfe8e60c) at kernel/qapplication_x11.cpp:3379
#29 0x0426107a in x11EventSourceDispatch (s=0x93d0c40, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#30 0x03743955 in g_main_dispatch (context=0x93cfc98) at /build/buildd/glib2.0-2.23.2/glib/gmain.c:1960
#31 IA__g_main_context_dispatch (context=0x93cfc98) at /build/buildd/glib2.0-2.23.2/glib/gmain.c:2513
#32 0x03747658 in g_main_context_iterate (context=0x93cfc98, block=<value optimized out>, dispatch=1, self=0x93cd780) at /build/buildd/glib2.0-2.23.2/glib/gmain.c:2591
#33 0x03747818 in IA__g_main_context_iteration (context=0x93cfc98, may_block=1) at /build/buildd/glib2.0-2.23.2/glib/gmain.c:2654
#34 0x032203f5 in QEventDispatcherGlib::processEvents (this=0x93b7fe8, flags=...) at kernel/qeventdispatcher_glib.cpp:407
#35 0x04260ba5 in QGuiEventDispatcherGlib::processEvents (this=0x93b7fe8, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#36 0x031f2d19 in QEventLoop::processEvents (this=0xbfe8e900, flags=) at kernel/qeventloop.cpp:149
#37 0x031f316a in QEventLoop::exec (this=0xbfe8e900, flags=...) at kernel/qeventloop.cpp:201
#38 0x0464062e in QMenu::exec (this=0x995a788, p=..., action=0x0) at widgets/qmenu.cpp:2045
#39 0x0064435a in KWin::Workspace::showWindowMenu (this=0x9461628, pos=..., cl=0x9a4d9c0) at ../../kwin/useractions.cpp:1586
#40 0x006443b1 in KWin::Workspace::showWindowMenu (this=0x9461628) at ../../kwin/workspace.h:1112
#41 KWin::Workspace::slotWindowOperations (this=0x9461628) at ../../kwin/useractions.cpp:1564
#42 0x005df0e6 in KWin::Workspace::qt_metacall (this=0x9461628, _c=QMetaObject::InvokeMetaMethod, _id=117, _a=0xbfe8eb38) at ./workspace.moc:479
#43 0x031f995a in QMetaObject::metacall (object=0x9461628, cl=3219707184, idx=117, argv=0xbfe8eb38) at kernel/qmetaobject.cpp:237
#44 0x032080db in QMetaObject::activate (sender=0x94e8c40, m=0x4ac3d98, local_signal_index=1, argv=0xbfe8eb38) at kernel/qobject.cpp:3294
#45 0x0419cab9 in QAction::triggered (this=0x94e8c40, _t1=false) at .moc/release-shared/moc_qaction.cpp:263
#46 0x0419ec0c in QAction::activate (this=0x94e8c40, event=QAction::Trigger) at kernel/qaction.cpp:1245
#47 0x00d565b1 in QAction::trigger (this=0x956a660, actionId=..., timestamp=<value optimized out>) at /usr/include/qt4/QtGui/qaction.h:218
#48 KGlobalAccelPrivate::_k_invokeAction (this=0x956a660, actionId=..., timestamp=<value optimized out>) at ../../kdeui/shortcuts/kglobalaccel.cpp:412
#49 0x00d5bf3a in KGlobalAccel::qt_metacall (this=0x9439be0, _c=QMetaObject::InvokeMetaMethod, _id=4, _a=0xbfe8ed44) at ./kglobalaccel.moc:76
#50 0x031f995a in QMetaObject::metacall (object=0x9439be0, cl=3219707184, idx=4, argv=0xbfe8ed44) at kernel/qmetaobject.cpp:237
#51 0x032080db in QMetaObject::activate (sender=0x956a674, m=0xec8624, local_signal_index=0, argv=0xbfe8ed44) at kernel/qobject.cpp:3294
#52 0x00e78ba5 in OrgKdeKGlobalAccelInterface::invokeAction (this=0x956a674, _t1=..., _t2=26096481) at kglobalaccel_interface.moc:158
#53 0x00e7904a in OrgKdeKGlobalAccelInterface::qt_metacall (this=0x956a674, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0xbfe8f06c) at kglobalaccel_interface.moc:115
#54 0x008e28a4 in QDBusConnectionPrivate::deliverCall (this=0x940c350, object=0x956a674, msg=..., metaTypes=..., slotIdx=5) at qdbusintegrator.cpp:904
#55 0x008eb187 in QDBusCallDeliveryEvent::placeMetaCall (this=0x99d09b8, object=0x956a674) at qdbusintegrator_p.h:101
#56 0x032050ee in QObject::event (this=0x956a674, e=0x99d09b8) at kernel/qobject.cpp:1260
#57 0x041a31dc in QApplicationPrivate::notify_helper (this=0x93cd9a8, receiver=0x956a674, e=0x99d09b8) at kernel/qapplication.cpp:4242
#58 0x041a9e37 in QApplication::notify (this=0xbfe8f8f8, receiver=0x956a674, e=0x99d09b8) at kernel/qapplication.cpp:3661
#59 0x00cf96fa in KApplication::notify (this=0xbfe8f8f8, receiver=0x956a674, event=0x99d09b8) at ../../kdeui/kernel/kapplication.cpp:302
#60 0x005f8c9f in KWin::Application::notify (this=0xbfe8f8f8, o=0x956a674, e=0x99d09b8) at ../../kwin/main.cpp:370
#61 0x031f46fb in QCoreApplication::notifyInternal (this=0xbfe8f8f8, receiver=0x956a674, event=0x99d09b8) at kernel/qcoreapplication.cpp:704
#62 0x031f7133 in QCoreApplication::sendEvent (receiver=0x0, event_type=0, data=0x93b83f0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#63 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x93b83f0) at kernel/qcoreapplication.cpp:1345
#64 0x031f729d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1238
#65 0x032208ff in QCoreApplication::sendPostedEvents (s=0x93cfd18) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:220
#66 postEventSourceDispatch (s=0x93cfd18) at kernel/qeventdispatcher_glib.cpp:276
#67 0x03743955 in g_main_dispatch (context=0x93cfc98) at /build/buildd/glib2.0-2.23.2/glib/gmain.c:1960
#68 IA__g_main_context_dispatch (context=0x93cfc98) at /build/buildd/glib2.0-2.23.2/glib/gmain.c:2513
#69 0x03747658 in g_main_context_iterate (context=0x93cfc98, block=<value optimized out>, dispatch=1, self=0x93cd780) at /build/buildd/glib2.0-2.23.2/glib/gmain.c:2591
#70 0x03747818 in IA__g_main_context_iteration (context=0x93cfc98, may_block=1) at /build/buildd/glib2.0-2.23.2/glib/gmain.c:2654
#71 0x032203f5 in QEventDispatcherGlib::processEvents (this=0x93b7fe8, flags=...) at kernel/qeventdispatcher_glib.cpp:407
#72 0x04260ba5 in QGuiEventDispatcherGlib::processEvents (this=0x93b7fe8, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#73 0x031f2d19 in QEventLoop::processEvents (this=0xbfe8f844, flags=) at kernel/qeventloop.cpp:149
#74 0x031f316a in QEventLoop::exec (this=0xbfe8f844, flags=...) at kernel/qeventloop.cpp:201
#75 0x031f735f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:981
#76 0x041a3277 in QApplication::exec () at kernel/qapplication.cpp:3570
#77 0x005fa8b0 in kdemain (argc=3, argv=0xbfe8fb04) at ../../kwin/main.cpp:526
#78 0x080485cb in main (argc=3, argv=0xbfe8fb04) at kwin_dummy.cpp:3

Reported using DrKonqi