Application that crashed: umbrello
Version of the application: 2.2.86
KDE Version: 4.2.86 (KDE 4.2.86 (KDE 4.3 >= 20090514)) "release 125"
Qt Version: 4.5.1
Operating System: Linux 2.6.27.21-0.1-default x86_64
Distribution: "openSUSE 11.1 (x86_64)"

What I was doing when the application crashed:
I clicked very often on the undo button. And after perhaps 35 - 40 klicks umbrello crashed.

 -- Backtrace:
Application: Umbrello UML-Modeller (umbrello), signal: Segmentation fault
[KCrash Handler]
#4  0x0000000000b361ee in ?? ()
#5  0x00007ff422ad7711 in QUndoStack::undo (this=<value optimized out>) at util/qundostack.cpp:661
#6  0x00007ff422ae6388 in QUndoStack::qt_metacall (this=0x1051b20, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff2d5c2880) at .moc/release-shared/moc_qundostack.cpp:99
#7  0x00007ff422032c22 in QMetaObject::activate (sender=0x10afbe0, from_signal_index=<value optimized out>, to_signal_index=6, argv=0x13e7f40) at kernel/qobject.cpp:3120
#8  0x00007ff4224aa777 in QAction::triggered (this=0x14d2f00, _t1=false) at .moc/release-shared/moc_qaction.cpp:236
#9  0x00007ff4224abbf0 in QAction::activate (this=0x10afbe0, event=<value optimized out>) at kernel/qaction.cpp:1160
#10 0x00007ff42283bb3a in QAbstractButtonPrivate::click (this=0x11409d0) at widgets/qabstractbutton.cpp:525
#11 0x00007ff42283bdd5 in QAbstractButton::mouseReleaseEvent (this=0x11b7d70, e=0x7fff2d5c3060) at widgets/qabstractbutton.cpp:1115
#12 0x00007ff42290dbba in QToolButton::mouseReleaseEvent (this=0x14d2f00, e=0x0) at widgets/qtoolbutton.cpp:709
#13 0x00007ff4225017ed in QWidget::event (this=0x11b7d70, event=0x7fff2d5c3060) at kernel/qwidget.cpp:7521
#14 0x00007ff4224b078d in QApplicationPrivate::notify_helper (this=0xfcb070, receiver=0x11b7d70, e=0x7fff2d5c3060) at kernel/qapplication.cpp:4057
#15 0x00007ff4224b918a in QApplication::notify (this=<value optimized out>, receiver=0x11b7d70, e=0x7fff2d5c3060) at kernel/qapplication.cpp:3759
#16 0x00007ff423f9837b in KApplication::notify (this=0x7fff2d5c4fc0, receiver=0x11b7d70, event=0x7fff2d5c3060) at /usr/src/debug/kdelibs-4.2.85/kdeui/kernel/kapplication.cpp:307
#17 0x00007ff42201d15c in QCoreApplication::notifyInternal (this=0x7fff2d5c4fc0, receiver=0x11b7d70, event=0x7fff2d5c3060) at kernel/qcoreapplication.cpp:610
#18 0x00007ff4224b83d8 in QApplicationPrivate::sendMouseEvent (receiver=0x11b7d70, event=0x7fff2d5c3060, alienWidget=0x11b7d70, nativeWidget=0x1099370, buttonDown=<value optimized out>, 
    lastMouseReceiver=@0x7ff422eeef30) at ../../src/corelib/kernel/qcoreapplication.h:216
#19 0x00007ff422522149 in QETWidget::translateMouseEvent (this=0x1099370, event=<value optimized out>) at kernel/qapplication_x11.cpp:4446
#20 0x00007ff4225211b5 in QApplication::x11ProcessEvent (this=0x7fff2d5c4fc0, event=0x7fff2d5c4be0) at kernel/qapplication_x11.cpp:3564
#21 0x00007ff422548384 in x11EventSourceDispatch (s=0xfce970, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#22 0x00007ff41cbce0fb in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#23 0x00007ff41cbd18cd in ?? () from /usr/lib64/libglib-2.0.so.0
#24 0x00007ff41cbd1a8b in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#25 0x00007ff42204689f in QEventDispatcherGlib::processEvents (this=0xfa4fc0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:324
#26 0x00007ff422547b0f in QGuiEventDispatcherGlib::processEvents (this=0x14d2f00, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#27 0x00007ff42201b9f2 in QEventLoop::processEvents (this=<value optimized out>, flags={i = 761024208}) at kernel/qeventloop.cpp:149
#28 0x00007ff42201bdbd in QEventLoop::exec (this=0x7fff2d5c4f10, flags={i = 761024288}) at kernel/qeventloop.cpp:200
#29 0x00007ff42201e0a4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#30 0x0000000000bd42a5 in ?? ()
#31 0x00007ff420cf2586 in __libc_start_main () from /lib64/libc.so.6
#32 0x0000000000435989 in _start ()