[umbrello] [Bug 504941] New: Modify Diagram > Open (Discard) > Undo crashes with a segfault

[Dillon]

https://bugs.kde.org/show_bug.cgi?id=504941

            Bug ID: 504941
           Summary: Modify Diagram > Open (Discard) > Undo crashes with a
                    segfault
    Classification: Applications
           Product: umbrello
      Version First Git
       Reported In:
          Platform: Other
                OS: Other
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: umbrello-devel at kde.org
          Reporter: dillonotto112 at gmail.com
  Target Milestone: ---

SUMMARY
Deterministic sequence of UI interactions crashes Umbrello

STEPS TO REPRODUCE
1. Modify the diagram (e.g. double click the select ok)
2. Click open, then discard
3. Close out of the file picker, then press undo

OBSERVED RESULT
Umbrello crashes with a segfault

VIDEO
https://youtu.be/4s4sN0nOzeE

BACKTRACE
Thread 1 "umbrello5" received signal SIGSEGV, Segmentation fault.
QWeakPointer<QObject>::internalData (this=0x555557468ce8) at
/usr/include/x86_64-linux-gnu/qt5/QtCore/qsharedpointer_impl.h:704
704                return d == nullptr || d->strongref.loadRelaxed() == 0 ?
nullptr : value;
#0  QWeakPointer<QObject>::internalData (this=0x555557468ce8) at
/usr/include/x86_64-linux-gnu/qt5/QtCore/qsharedpointer_impl.h:704
#1  QPointer<UMLStereotype>::data (this=0x555557468ce8) at
/usr/include/x86_64-linux-gnu/qt5/QtCore/qpointer.h:77
#2  QPointer<UMLStereotype>::operator-> (this=0x555557468ce8) at
/usr/include/x86_64-linux-gnu/qt5/QtCore/qpointer.h:79
#3  operator==<UMLStereotype> (o=0x0, p=...) at
/usr/include/x86_64-linux-gnu/qt5/QtCore/qpointer.h:103
#4  UMLObject::setUMLStereotype (this=0x555557468cb0, stereo=0x0) at
/home/guifuzz/GUIFuzzBenchmarks/fuzzing/umbrello/umbrello/umlmodel/umlobject.cpp:499
#5  0x000055555638f3be in UMLDoc::removeUMLObject (this=0x555556e38f60,
umlobject=0x555557468cb0, deleteObject=false) at
/home/guifuzz/GUIFuzzBenchmarks/fuzzing/umbrello/umbrello/umldoc.cpp:1772
#6  0x00007ffff6d4015e in QUndoCommand::undo() () from
/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#7  0x00007ffff6d41552 in QUndoStack::setIndex(int) () from
/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#8  0x00007ffff5d24862 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007ffff5c8d2f0 in QItemSelectionModel::currentChanged(QModelIndex
const&, QModelIndex const&) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007ffff5c910c0 in QItemSelectionModel::setCurrentIndex(QModelIndex
const&, QFlags<QItemSelectionModel::SelectionFlag>) () from
/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007ffff6c03346 in QAbstractItemView::mousePressEvent(QMouseEvent*) ()
from /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#12 0x00007ffff69b1258 in QWidget::event(QEvent*) () from
/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#13 0x00007ffff6a653a7 in QFrame::event(QEvent*) () from
/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#14 0x00007ffff5ce8a02 in
QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) ()
from /lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007ffff696bee5 in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() from /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#16 0x00007ffff69746af in QApplication::notify(QObject*, QEvent*) () from
/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#17 0x00007ffff5ce8c98 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
() from /lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007ffff697252d in QApplicationPrivate::sendMouseEvent(QWidget*,
QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool, bool) ()
from /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#19 0x00007ffff69cbcb7 in ?? () from /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#20 0x00007ffff69cf3cf in ?? () from /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#21 0x00007ffff696bef5 in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() from /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#22 0x00007ffff5ce8c98 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
() from /lib/x86_64-linux-gnu/libQt5Core.so.5
#23 0x00007ffff614ab87 in
QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*)
() from /lib/x86_64-linux-gnu/libQt5Gui.so.5
#24 0x00007ffff611afac in
QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>)
() from /lib/x86_64-linux-gnu/libQt5Gui.so.5
#25 0x00007ffff10103f6 in ?? () from /lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#26 0x00007ffff41b7397 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007ffff4217dc7 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007ffff41b68b3 in g_main_context_iteration () from
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#29 0x00007ffff5d47afd in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
from /lib/x86_64-linux-gnu/libQt5Core.so.5
#30 0x00007ffff5ce75ab in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from
/lib/x86_64-linux-gnu/libQt5Core.so.5
#31 0x00007ffff5cf0286 in QCoreApplication::exec() () from
/lib/x86_64-linux-gnu/libQt5Core.so.5
#32 0x0000555555668071 in main (argc=<optimized out>, argv=<optimized out>) at
/home/guifuzz/GUIFuzzBenchmarks/fuzzing/umbrello/umbrello/main.cpp:258
A debugging session is active.

SOFTWARE/OS VERSIONS
Umbrello 25.07.70
Ubuntu 24.10

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