Application: umbrello (2.5.1)
KDE Platform Version: 4.5.1 (KDE 4.5.1)
Qt Version: 4.7.0
Operating System: Linux 2.6.35-25-generic i686
Distribution: Ubuntu 10.10

-- Information about the crash:
Umbrello Crashed while i undo the operations like moving the usecases.

This is 2nd time i'm experiencing this crash.

The crash can be reproduced some of the time.

-- Backtrace:
Application: Umbrello UML Modeller (umbrello), signal: Segmentation fault
[Current thread is 1 (Thread 0xb7714930 (LWP 4361))]

Thread 2 (Thread 0xb74c0b70 (LWP 4362)):
#0  0x0061f416 in __kernel_vsyscall ()
#1  0x0050edf6 in __poll (fds=0x5a5ff4, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:87
#2  0x07374a1b in g_poll () from /lib/libglib-2.0.so.0
#3  0x0736743c in ?? () from /lib/libglib-2.0.so.0
#4  0x07367ba7 in g_main_loop_run () from /lib/libglib-2.0.so.0
#5  0x06bd86b4 in ?? () from /usr/lib/libgio-2.0.so.0
#6  0x0738e48f in ?? () from /lib/libglib-2.0.so.0
#7  0x00d94cc9 in start_thread (arg=0xb74c0b70) at pthread_create.c:304
#8  0x0051d69e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 1 (Thread 0xb7714930 (LWP 4361)):
[KCrash Handler]
#7  0x05be76ea in QUndoStack::push (this=0xa8e1e50, cmd=0xaa5ab78) at util/qundostack.cpp:562
#8  0x085ae28b in UMLApp::executeCommand (this=0xa86fcd8, cmd=0xaa5ab78) at ../../../umbrello/umbrello/uml.cpp:2794
#9  0x0808fac7 in UMLWidgetController::mouseReleaseEvent (this=0xaa0c6c8, me=0xab18430) at ../../../umbrello/umbrello/controller/umlwidgetcontroller.cpp:327
#10 0x085a77e4 in ToolBarStateArrow::mouseReleaseWidget (this=0xaa77f58) at ../../../umbrello/umbrello/toolbarstatearrow.cpp:118
#11 0x085a6fd6 in ToolBarState::mouseRelease (this=0xaa77f58, ome=0xbf802a30) at ../../../umbrello/umbrello/toolbarstate.cpp:123
#12 0x08d55258 in Q3ScrollView::viewportMouseReleaseEvent (this=0xaa0d338, e=0xbf802fc0) at widgets/q3scrollview.cpp:1763
#13 0x08d57048 in Q3ScrollView::eventFilter (this=0xaa0d338, obj=0xab38420, e=0xbf802fc0) at widgets/q3scrollview.cpp:1481
#14 0x0381e29a in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0xa738b98, receiver=0xab38420, event=0xbf802fc0) at kernel/qcoreapplication.cpp:847
#15 0x0549ffb9 in QApplicationPrivate::notify_helper (this=0xa738b98, receiver=0xab38420, e=0xbf802fc0) at kernel/qapplication.cpp:4392
#16 0x054a6c2e in QApplication::notify (this=0xbf803870, receiver=0xab38420, e=0xbf802fc0) at kernel/qapplication.cpp:3959
#17 0x0106968a in KApplication::notify (this=0xbf803870, receiver=0xab38420, event=0xbf802fc0) at ../../kdeui/kernel/kapplication.cpp:310
#18 0x0381eb3b in QCoreApplication::notifyInternal (this=0xbf803870, receiver=0xab38420, event=0xbf802fc0) at kernel/qcoreapplication.cpp:732
#19 0x054a5094 in sendEvent (receiver=0xab38420, event=0xbf802fc0, alienWidget=0xab38420, nativeWidget=0xa9a3b20, buttonDown=0x5e3a3c0, lastMouseReceiver=..., spontaneous=true) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#20 QApplicationPrivate::sendMouseEvent (receiver=0xab38420, event=0xbf802fc0, alienWidget=0xab38420, nativeWidget=0xa9a3b20, buttonDown=0x5e3a3c0, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:3058
#21 0x05533d10 in QETWidget::translateMouseEvent (this=0xa9a3b20, event=0xbf8034dc) at kernel/qapplication_x11.cpp:4403
#22 0x05533151 in QApplication::x11ProcessEvent (this=0xbf803870, event=0xbf8034dc) at kernel/qapplication_x11.cpp:3414
#23 0x0556236a in x11EventSourceDispatch (s=0xa73bda8, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#24 0x07363855 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#25 0x07367668 in ?? () from /lib/libglib-2.0.so.0
#26 0x07367848 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#27 0x0384d565 in QEventDispatcherGlib::processEvents (this=0xa71b3c8, flags=...) at kernel/qeventdispatcher_glib.cpp:415
#28 0x05561be5 in QGuiEventDispatcherGlib::processEvents (this=0xa71b3c8, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#29 0x0381d609 in QEventLoop::processEvents (this=0xbf8037d4, flags=) at kernel/qeventloop.cpp:149
#30 0x0381da8a in QEventLoop::exec (this=0xbf8037d4, flags=...) at kernel/qeventloop.cpp:201
#31 0x0382200f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1009
#32 0x0549ee07 in QApplication::exec () at kernel/qapplication.cpp:3672
#33 0x0858b785 in main (argc=3, argv=0xbf803a24) at ../../../umbrello/umbrello/main.cpp:111

Reported using DrKonqi