Application that crashed: umbrello
Version of the application: 2.3.2
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-17-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
I just created 1 class, deleted it, then crash on undo operation.
I tried to reproduce the problem with use case diagram, the problem is the same with any objects deleted then a undo.

 -- Backtrace:
Application: Umbrello UML Modeller (umbrello), signal: Segmentation fault
[KCrash Handler]
#6  0x00000000 in ?? ()
#7  0x0176f097 in QUndoStack::undo (this=0x9527588) at util/qundostack.cpp:661
#8  0x01782003 in QUndoStack::qt_metacall (this=0x9527588, _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0xbfcf06c8) at .moc/release-shared/moc_qundostack.cpp:99
#9  0x00a9dd82 in KUndoStack::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkdeui.so.5
#10 0x08de0263 in QMetaObject::activate (sender=0x952fdf0, from_signal_index=5, to_signal_index=6, argv=0xbfcf06c8) at kernel/qobject.cpp:3113
#11 0x08de06d8 in QMetaObject::activate (sender=0x952fdf0, m=0x194ce48, from_local_signal_index=1, to_local_signal_index=2, argv=0xbfcf06c8) at kernel/qobject.cpp:3207
#12 0x010e49b1 in QAction::triggered (this=0x952fdf0, _t1=false) at .moc/release-shared/moc_qaction.cpp:236
#13 0x010e5f32 in QAction::activate (this=0x952fdf0, event=QAction::Trigger) at kernel/qaction.cpp:1160
#14 0x01587f02 in QAction::trigger (this=0x9794a58) at ../../include/QtGui/../../src/gui/kernel/qaction.h:203
#15 QToolButton::nextCheckState (this=0x9794a58) at widgets/qtoolbutton.cpp:1135
#16 0x014a2163 in QAbstractButtonPrivate::click (this=0x9677bf8) at widgets/qabstractbutton.cpp:525
#17 0x014a2431 in QAbstractButton::mouseReleaseEvent (this=0x9677b08, e=0xbfcf0cf0) at widgets/qabstractbutton.cpp:1115
#18 0x015883fc in QToolButton::mouseReleaseEvent (this=0x9677b08, e=0xbfcf0cf0) at widgets/qtoolbutton.cpp:709
#19 0x01140012 in QWidget::event (this=0x9677b08, event=0xbfcf0cf0) at kernel/qwidget.cpp:7549
#20 0x014a03ee in QAbstractButton::event (this=0x9677b08, e=0x9794a58) at widgets/qabstractbutton.cpp:1077
#21 0x0158ad9a in QToolButton::event (this=0x9677b08, event=0xbfcf0cf0) at widgets/qtoolbutton.cpp:1151
#22 0x010eaf54 in QApplicationPrivate::notify_helper (this=0x93d2368, receiver=0x9677b08, e=0xbfcf0cf0) at kernel/qapplication.cpp:4056
#23 0x010f3033 in QApplication::notify (this=0xbfcf26d0, receiver=0x9677b08, e=0xbfcf0cf0) at kernel/qapplication.cpp:3758
#24 0x009fdbfa in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#25 0x08dca6cb in QCoreApplication::notifyInternal (this=0xbfcf26d0, receiver=0x9677b08, event=0xbfcf0cf0) at kernel/qcoreapplication.cpp:610
#26 0x010f1f6e in QCoreApplication::sendSpontaneousEvent (receiver=0x9677b08, event=0xbfcf0cf0, alienWidget=0x9677b08, nativeWidget=0x94f5438, buttonDown=0x1965aa0, lastMouseReceiver=...)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#27 QApplicationPrivate::sendMouseEvent (receiver=0x9677b08, event=0xbfcf0cf0, alienWidget=0x9677b08, nativeWidget=0x94f5438, buttonDown=0x1965aa0, lastMouseReceiver=...)
    at kernel/qapplication.cpp:2924
#28 0x011607c0 in QETWidget::translateMouseEvent (this=0x94f5438, event=0xbfcf233c) at kernel/qapplication_x11.cpp:4409
#29 0x0115fc4b in QApplication::x11ProcessEvent (this=0xbfcf26d0, event=0xbfcf233c) at kernel/qapplication_x11.cpp:3428
#30 0x0118c502 in x11EventSourceDispatch (s=0x93d5568, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#31 0x019dee88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#32 0x019e2730 in ?? () from /lib/libglib-2.0.so.0
#33 0x019e2863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#34 0x08df502c in QEventDispatcherGlib::processEvents (this=0x93b54e0, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#35 0x0118bbe5 in QGuiEventDispatcherGlib::processEvents (this=0x93b54e0, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#36 0x08dc8c79 in QEventLoop::processEvents (this=0xbfcf2634, flags=) at kernel/qeventloop.cpp:149
#37 0x08dc90ca in QEventLoop::exec (this=0xbfcf2634, flags=...) at kernel/qeventloop.cpp:201
#38 0x08dcb53f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#39 0x010eadd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#40 0x086ec2b5 in ?? ()
#41 0x00e62b56 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#42 0x08073461 in _start ()

This bug may be a duplicate of or related to bug 202436

Reported using DrKonqi