Application: umbrello (2.8.4)
KDE Platform Version: 4.8.4 (4.8.4)
Qt Version: 4.8.1
Operating System: Linux 3.2.0-30-generic x86_64
Distribution: Ubuntu 12.04.1 LTS

-- Information about the crash:
- What I was doing when the application crashed:

I was trying to undo a generalization association that I had just created between two classes. I created a few classes first and the tried to create some associations between them. Once one was made, I kept trying to undo and it crashed during the process. I used Ctrl+Z

-- Backtrace:
Application: Umbrello UML Modeller (umbrello), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f8994427780 (LWP 9503))]

Thread 2 (Thread 0x7f8980ea7700 (LWP 9504)):
#0  0x00007f899040fb03 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f898d310036 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f898d310164 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f89910a0426 in QEventDispatcherGlib::processEvents (this=0x7f897c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#4  0x00007f899106fc82 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f899106fed7 in QEventLoop::exec (this=0x7f8980ea6dd0, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007f8990f6efa7 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#7  0x00007f899104f9ff in QInotifyFileSystemWatcherEngine::run (this=0x2597bd0) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f8990f71fcb in QThreadPrivate::start (arg=0x2597bd0) at thread/qthread_unix.cpp:298
#9  0x00007f8990113e9a in start_thread (arg=0x7f8980ea7700) at pthread_create.c:308
#10 0x00007f899041b4bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f8994427780 (LWP 9503)):
[KCrash Handler]
#6  0x000000000044aaf9 in ?? ()
#7  0x00000000006610ea in ?? ()
#8  0x00007f8992338e6f in QUndoStack::setIndex (this=<optimized out>, idx=57) at util/qundostack.cpp:780
#9  0x00007f899233a9c1 in QUndoModel::setStackCurrentIndex (this=0x28af450, index=...) at util/qundoview.cpp:160
#10 0x00007f8991085281 in QMetaObject::activate (sender=0x28af950, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7fff0e7dff10) at kernel/qobject.cpp:3547
#11 0x00007f89922408ea in QItemSelectionModel::currentChanged (this=<optimized out>, _t1=..., _t2=...) at .moc/release-shared/moc_qitemselectionmodel.cpp:173
#12 0x00007f89922409e0 in QItemSelectionModel::setCurrentIndex (this=0x28af950, index=..., command=...) at itemviews/qitemselectionmodel.cpp:1175
#13 0x00007f89921ef084 in QAbstractItemView::mousePressEvent (this=0x28abf70, event=<optimized out>) at itemviews/qabstractitemview.cpp:1682
#14 0x00007f8991d14429 in QWidget::event (this=0x28abf70, event=0x7fff0e7e0db0) at kernel/qwidget.cpp:8358
#15 0x00007f89920d43b6 in QFrame::event (this=0x28abf70, e=0x7fff0e7e0db0) at widgets/qframe.cpp:557
#16 0x00007f89921e889b in QAbstractItemView::viewportEvent (this=0x28abf70, event=0x7fff0e7e0db0) at itemviews/qabstractitemview.cpp:1644
#17 0x00007f8991071028 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=<optimized out>, receiver=0x28ac030, event=0x7fff0e7e0db0) at kernel/qcoreapplication.cpp:986
#18 0x00007f8991cc385f in notify_helper (e=0x7fff0e7e0db0, receiver=0x28ac030, this=0x239c3c0) at kernel/qapplication.cpp:4555
#19 QApplicationPrivate::notify_helper (this=0x239c3c0, receiver=0x28ac030, e=0x7fff0e7e0db0) at kernel/qapplication.cpp:4531
#20 0x00007f8991cc90bf in QApplication::notify (this=<optimized out>, receiver=0x28ac030, e=0x7fff0e7e0db0) at kernel/qapplication.cpp:4102
#21 0x00007f89929fd9e6 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#22 0x00007f8991070e9c in QCoreApplication::notifyInternal (this=0x7fff0e7e1ab0, receiver=0x28ac030, event=0x7fff0e7e0db0) at kernel/qcoreapplication.cpp:876
#23 0x00007f8991cc4862 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#24 QApplicationPrivate::sendMouseEvent (receiver=0x28ac030, event=0x7fff0e7e0db0, alienWidget=0x28ac030, nativeWidget=0x288d7a0, buttonDown=0x28ac030, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:3170
#25 0x00007f8991d43bf5 in QETWidget::translateMouseEvent (this=0x288d7a0, event=<optimized out>) at kernel/qapplication_x11.cpp:4617
#26 0x00007f8991d42bae in QApplication::x11ProcessEvent (this=0x7fff0e7e1ab0, event=0x7fff0e7e1680) at kernel/qapplication_x11.cpp:3732
#27 0x00007f8991d6c0d2 in x11EventSourceDispatch (s=0x23939b0, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#28 0x00007f898d30fd53 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#29 0x00007f898d3100a0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#30 0x00007f898d310164 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#31 0x00007f89910a03bf in QEventDispatcherGlib::processEvents (this=0x236e3d0, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#32 0x00007f8991d6bd5e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#33 0x00007f899106fc82 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#34 0x00007f899106fed7 in QEventLoop::exec (this=0x7fff0e7e1a20, flags=...) at kernel/qeventloop.cpp:204
#35 0x00007f8991074f67 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1148
#36 0x0000000000438d16 in ?? ()
#37 0x00007f899034a76d in __libc_start_main (main=0x438680, argc=3, ubp_av=0x7fff0e7e1ec8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff0e7e1eb8) at libc-start.c:226
#38 0x000000000043a345 in _start ()

Possible duplicates by query: bug 306043, bug 296750, bug 293997, bug 293550, bug 286543.

Reported using DrKonqi