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 2.6.31-15-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
when I was trying to redo an operation in umbrello, it crashed ;)
I was doing some moving of classes and connecting classes with arrows before, then wanted to undo a connection which didn't work, so I redid it and it crashed

 -- Backtrace:
Application: Umbrello UML Modeller (umbrello), signal: Segmentation fault
[KCrash Handler]
#6  QBasicAtomicInt::ref (this=0x9c1a690) at ../../include/QtCore/../../src/corelib/arch/qatomic_i386.h:120
#7  QString (this=0x9c1a690) at ../../include/QtCore/../../src/corelib/tools/qstring.h:712
#8  QUndoCommand::text (this=0x9c1a690) at util/qundostack.cpp:242
#9  0x016feb98 in QUndoStack::undoText (this=0x97c6e68) at util/qundostack.cpp:797
#10 0x016ffd32 in QUndoStackPrivate::setIndex (this=0x97c6e78, idx=<value optimized out>, clean=false) at util/qundostack.cpp:403
#11 0x0170002d in QUndoStack::redo (this=0x97c6e68) at util/qundostack.cpp:687
#12 0x01712f83 in QUndoStack::qt_metacall (this=0x97c6e68, _c=QMetaObject::InvokeMetaMethod, _id=9, _a=0xbfe48b18) at .moc/release-shared/moc_qundostack.cpp:100
#13 0x00a98d82 in KUndoStack::qt_metacall (this=0x97c6e68, _c=QMetaObject::InvokeMetaMethod, _id=13, _a=0xbfe48b18) at ./kundostack.moc:58
#14 0x00d8c263 in QMetaObject::activate (sender=0x97e0ab8, from_signal_index=5, to_signal_index=6, argv=0xbfe48b18) at kernel/qobject.cpp:3113
#15 0x00d8c6d8 in QMetaObject::activate (sender=0x97e0ab8, m=0x18dde48, from_local_signal_index=1, to_local_signal_index=2, argv=0xbfe48b18) at kernel/qobject.cpp:3207
#16 0x010759b1 in QAction::triggered (this=0x97e0ab8, _t1=false) at .moc/release-shared/moc_qaction.cpp:236
#17 0x01076f32 in QAction::activate (this=0x97e0ab8, event=QAction::Trigger) at kernel/qaction.cpp:1160
#18 0x01518f02 in QAction::trigger (this=0x65696c43) at ../../include/QtGui/../../src/gui/kernel/qaction.h:203
#19 QToolButton::nextCheckState (this=0x65696c43) at widgets/qtoolbutton.cpp:1135
#20 0x01433163 in QAbstractButtonPrivate::click (this=0x9926b58) at widgets/qabstractbutton.cpp:525
#21 0x01433431 in QAbstractButton::mouseReleaseEvent (this=0x9926a98, e=0xbfe49140) at widgets/qabstractbutton.cpp:1115
#22 0x015193fc in QToolButton::mouseReleaseEvent (this=0x9926a98, e=0xbfe49140) at widgets/qtoolbutton.cpp:709
#23 0x010d1012 in QWidget::event (this=0x9926a98, event=0xbfe49140) at kernel/qwidget.cpp:7549
#24 0x014313ee in QAbstractButton::event (this=0x9926a98, e=0x65696c43) at widgets/qabstractbutton.cpp:1077
#25 0x0151bd9a in QToolButton::event (this=0x9926a98, event=0xbfe49140) at widgets/qtoolbutton.cpp:1151
#26 0x0107bf54 in QApplicationPrivate::notify_helper (this=0x96d73a8, receiver=0x9926a98, e=0xbfe49140) at kernel/qapplication.cpp:4056
#27 0x01084033 in QApplication::notify (this=0xbfe4ab20, receiver=0x9926a98, e=0xbfe49140) at kernel/qapplication.cpp:3758
#28 0x009f8bfa in KApplication::notify (this=0xbfe4ab20, receiver=0x9926a98, event=0xbfe49140) at ../../kdeui/kernel/kapplication.cpp:302
#29 0x00d766cb in QCoreApplication::notifyInternal (this=0xbfe4ab20, receiver=0x9926a98, event=0xbfe49140) at kernel/qcoreapplication.cpp:610
#30 0x01082f6e in QCoreApplication::sendSpontaneousEvent (receiver=0x9926a98, event=0xbfe49140, alienWidget=0x9926a98, nativeWidget=0x97e37a0, buttonDown=0x18f6aa0, lastMouseReceiver=...)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:216
#31 QApplicationPrivate::sendMouseEvent (receiver=0x9926a98, event=0xbfe49140, alienWidget=0x9926a98, nativeWidget=0x97e37a0, buttonDown=0x18f6aa0, lastMouseReceiver=...)
    at kernel/qapplication.cpp:2924
#32 0x010f17c0 in QETWidget::translateMouseEvent (this=0x97e37a0, event=0xbfe4a78c) at kernel/qapplication_x11.cpp:4409
#33 0x010f0c4b in QApplication::x11ProcessEvent (this=0xbfe4ab20, event=0xbfe4a78c) at kernel/qapplication_x11.cpp:3428
#34 0x0111d502 in x11EventSourceDispatch (s=0x96da568, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#35 0x0916ae78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#36 0x0916e720 in ?? () from /lib/libglib-2.0.so.0
#37 0x0916e853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#38 0x00da102c in QEventDispatcherGlib::processEvents (this=0x96ba4e0, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#39 0x0111cbe5 in QGuiEventDispatcherGlib::processEvents (this=0x96ba4e0, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#40 0x00d74c79 in QEventLoop::processEvents (this=0xbfe4aa84, flags=) at kernel/qeventloop.cpp:149
#41 0x00d750ca in QEventLoop::exec (this=0xbfe4aa84, flags=...) at kernel/qeventloop.cpp:201
#42 0x00d7753f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#43 0x0107bdd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#44 0x086ec2b5 in ?? ()
#45 0x01b57b56 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#46 0x08073461 in _start ()

This bug may be a duplicate of or related to bug 212071

Reported using DrKonqi