Application: kwin (4.4.4 (KDE 4.4.4))
KDE Platform Version: 4.4.4 (KDE 4.4.4)
Qt Version: 4.6.3
Operating System: Linux 2.6.34.1 x86_64
Distribution: Debian GNU/Linux unstable (sid)

-- Information about the crash:
I pressed alt+tab then kwin suddenly crashed. This never happend before. Desktop effect is "show windows"

 -- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
[KCrash Handler]
#5  0x00007ffd5a00c36a in KWin::TabBox::ClientModel::data (this=<value optimized out>, index=<value optimized out>, role=<value optimized out>) at ../../kwin/tabbox/clientmodel.cpp:67
#6  0x00007ffd5a00aec0 in KWin::TabBox::ClientItemDelegate::rowSize (this=<value optimized out>, index=..., row=<value optimized out>) at ../../kwin/tabbox/clientitemdelegate.cpp:235
#7  0x00007ffd5a00b01e in KWin::TabBox::ClientItemDelegate::sizeHint (this=0x16e18a0, option=<value optimized out>, index=...) at ../../kwin/tabbox/clientitemdelegate.cpp:82
#8  0x00007ffd56adfd01 in QTableView::sizeHintForColumn (this=<value optimized out>, column=<value optimized out>) at itemviews/qtableview.cpp:2217
#9  0x00007ffd5a016356 in KWin::TabBox::TabBoxAdditionalView::sizeHint (this=0x7fff2209e4e0) at ../../kwin/tabbox/tabboxview.cpp:438
#10 0x00007ffd565d3102 in QWidgetPrivate::adjustedSize (this=0x1b0ed10) at kernel/qwidget.cpp:7798
#11 0x00007ffd565d9642 in QWidget::adjustSize (this=0x199b680) at kernel/qwidget.cpp:7862
#12 0x00007ffd565e1b5d in QWidget::setVisible (this=0x199b680, visible=<value optimized out>) at kernel/qwidget.cpp:7433
#13 0x00007ffd5a016b7e in QWidget::show (this=0x16be550) at /usr/include/qt4/QtGui/qwidget.h:485
#14 KWin::TabBox::TabBoxView::configChanged (this=0x16be550) at ../../kwin/tabbox/tabboxview.cpp:288
#15 0x00007ffd5a017081 in KWin::TabBox::TabBoxView::qt_metacall (this=0x16be550, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff2209ed10) at ./tabboxview.moc:79
#16 0x00007ffd55e0c346 in QMetaObject::activate (sender=0x16bb5c0, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0xfffffffffff8313c) at kernel/qobject.cpp:3295
#17 0x00007ffd5a015cb1 in KWin::TabBox::TabBoxHandler::setConfig (this=0x16bb5c0, config=...) at ../../kwin/tabbox/tabboxhandler.cpp:445
#18 0x00007ffd5a006eef in KWin::Workspace::startKDEWalkThroughWindows (this=0x15549d0, mode=KWin::TabBoxWindowsMode) at ../../kwin/tabbox.cpp:898
#19 0x00007ffd5a009dfe in KWin::Workspace::navigatingThroughWindows (this=0x15549d0, forward=true, shortcut=<value optimized out>, mode=4294455612) at ../../kwin/tabbox.cpp:742
#20 0x00007ffd59fe91cf in KWin::Workspace::qt_metacall (this=0x15549d0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff2209ef70) at ./workspace.moc:461
#21 0x00007ffd55e0c346 in QMetaObject::activate (sender=0x1652ab0, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0xfffffffffff8313c) at kernel/qobject.cpp:3295
#22 0x00007ffd5657e132 in QAction::triggered (this=0x7fff2209e4e0, _t1=false) at .moc/release-shared/moc_qaction.cpp:263
#23 0x00007ffd565801ab in QAction::activate (this=0x1652ab0, event=<value optimized out>) at kernel/qaction.cpp:1255
#24 0x00007ffd59892934 in QAction::trigger (this=<value optimized out>, actionId=<value optimized out>, timestamp=51341763) at /usr/include/qt4/QtGui/qaction.h:218
#25 KGlobalAccelPrivate::_k_invokeAction (this=<value optimized out>, actionId=<value optimized out>, timestamp=51341763) at ../../kdeui/shortcuts/kglobalaccel.cpp:412
#26 0x00007ffd59897b94 in KGlobalAccel::qt_metacall (this=0x168b4e0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff2209f190) at ./kglobalaccel.moc:76
#27 0x00007ffd55e0c346 in QMetaObject::activate (sender=0x16715e8, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0xfffffffffff8313c) at kernel/qobject.cpp:3295
#28 0x00007ffd599973a4 in OrgKdeKGlobalAccelInterface::invokeAction (this=0x7fff2209e4e0, _t1=<value optimized out>, _t2=51341763) at kglobalaccel_interface.moc:158
#29 0x00007ffd599976d3 in OrgKdeKGlobalAccelInterface::qt_metacall (this=0x16715e8, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff2209f6f0) at kglobalaccel_interface.moc:115
#30 0x00007ffd56137421 in QDBusConnectionPrivate::deliverCall (this=<value optimized out>, object=<value optimized out>, msg=<value optimized out>, metaTypes=..., slotIdx=<value optimized out>)
    at qdbusintegrator.cpp:904
#31 0x00007ffd56141dcf in QDBusCallDeliveryEvent::placeMetaCall (this=0x7ffd00000000, object=0x2879ee0) at qdbusintegrator_p.h:101
#32 0x00007ffd55e08e89 in QObject::event (this=0x16715e8, e=0x2b5dbf0) at kernel/qobject.cpp:1248
#33 0x00007ffd5658432c in QApplicationPrivate::notify_helper (this=0x13fbf30, receiver=0x16715e8, e=0x2b5dbf0) at kernel/qapplication.cpp:4302
#34 0x00007ffd5658a80b in QApplication::notify (this=0x7fff220a03a0, receiver=0x16715e8, e=0x2b5dbf0) at kernel/qapplication.cpp:4185
#35 0x00007ffd59840436 in KApplication::notify (this=0x7fff220a03a0, receiver=0x16715e8, event=0x2b5dbf0) at ../../kdeui/kernel/kapplication.cpp:302
#36 0x00007ffd55df915c in QCoreApplication::notifyInternal (this=0x7fff220a03a0, receiver=0x16715e8, event=0x2b5dbf0) at kernel/qcoreapplication.cpp:726
#37 0x00007ffd55dfc804 in QCoreApplication::sendEvent (receiver=0x0, event_type=<value optimized out>, data=0x13e2c70) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#38 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=<value optimized out>, data=0x13e2c70) at kernel/qcoreapplication.cpp:1367
#39 0x00007ffd55e22bd3 in QCoreApplication::sendPostedEvents (s=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:220
#40 postEventSourceDispatch (s=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:276
#41 0x00007ffd4f43e1f2 in g_main_dispatch (context=0x13fed20) at /glib2.0-2.25.11/glib/gmain.c:2119
#42 g_main_context_dispatch (context=0x13fed20) at /glib2.0-2.25.11/glib/gmain.c:2672
#43 0x00007ffd4f442148 in g_main_context_iterate (context=0x13fed20, block=<value optimized out>, dispatch=<value optimized out>, self=<value optimized out>) at /glib2.0-2.25.11/glib/gmain.c:2750
#44 0x00007ffd4f4422fc in g_main_context_iteration (context=0x13fed20, may_block=1) at /glib2.0-2.25.11/glib/gmain.c:2813
#45 0x00007ffd55e22713 in QEventDispatcherGlib::processEvents (this=0x13e2450, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:412
#46 0x00007ffd5663414e in QGuiEventDispatcherGlib::processEvents (this=0x7fff2209e4e0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#47 0x00007ffd55df7a82 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#48 0x00007ffd55df7e5c in QEventLoop::exec (this=0x7fff220a02e0, flags=) at kernel/qeventloop.cpp:201
#49 0x00007ffd55dfcaeb in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1003
#50 0x00007ffd5a00450e in kdemain (argc=<value optimized out>, argv=<value optimized out>) at ../../kwin/main.cpp:526
#51 0x00007ffd59c72c4d in __libc_start_main (main=<value optimized out>, argc=<value optimized out>, ubp_av=<value optimized out>, init=<value optimized out>, fini=<value optimized out>, 
    rtld_fini=<value optimized out>, stack_end=0x7fff220a08a8) at libc-start.c:228
#52 0x00000000004006a9 in _start ()

Possible duplicates by query: bug 237345.

Reported using DrKonqi