SUMMARY
***
NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols.
See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports
***


STEPS TO REPRODUCE
1.  exit kmail
2.  observe crash

OBSERVED RESULT


EXPECTED RESULT


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION
Thread 1 "kmail" received signal SIGSEGV, Segmentation fault.
0x00007fffeb696b80 in QObject::staticMetaObject () from /opt/qt6/lib/libQt6Core.so.6
(gdb) bt
#0  0x00007fffeb696b80 in QObject::staticMetaObject () at /opt/qt6/lib/libQt6Core.so.6
#1  0x00007fffe8a2e643 in KSelectionProxyModel::columnCount(QModelIndex const&) const (this=0x555555eb51c0, index=...)
    at /src/kdesrc/kitemmodels/src/core/kselectionproxymodel.cpp:2362
#2  0x00007fffeb446371 in QSortFilterProxyModelPrivate::find_source_sort_column() const (this=this@entry=0x555555e956d0)
    at /src/qt5/qtbase/src/corelib/itemmodels/qsortfilterproxymodel.cpp:660
#3  0x00007fffeb44fd51 in QSortFilterProxyModelPrivate::_q_clearMapping() (this=0x555555e956d0)
    at /src/qt5/qtbase/src/corelib/itemmodels/qsortfilterproxymodel.cpp:468
#4  0x00007fffeb45403e in QSortFilterProxyModelPrivate::_q_sourceReset() (this=0x555555e956d0)
    at /src/qt5/qtbase/src/corelib/itemmodels/qsortfilterproxymodel.cpp:1587
#5  0x00007fffeb1dc4dd in QtPrivate::QSlotObjectBase::call(QObject*, void**) (a=0x7fffffffbb10, r=0x555555f4e570, this=<optimized out>)
    at /src/qt5/build2/qtbase/include/QtCore/../../../../qtbase/src/corelib/kernel/qobjectdefs_impl.h:469
#6  doActivate<false>(QObject*, int, void**) (sender=0x555555eb51c0, signal_index=21, argv=0x7fffffffbb10)
    at /src/qt5/qtbase/src/corelib/kernel/qobject.cpp:4043
#7  0x00007fffeb1d3f07 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**)
    (sender=<optimized out>, m=m@entry=0x7fffeb6a0c80 <QAbstractItemModel::staticMetaObject>, local_signal_index=local_signal_index@entry=18, argv=argv@entry=0x7fffffffbb10) at /src/qt5/qtbase/src/corelib/kernel/qobject.cpp:4103
#8  0x00007fffeb3febd1 in QAbstractItemModel::modelReset(QAbstractItemModel::QPrivateSignal) (this=<optimized out>, _t1=...)
    at /src/qt5/build2/qtbase/src/corelib/Core_autogen/include/moc_qabstractitemmodel.cpp:1110
#9  0x00007fffeb1dc4dd in QtPrivate::QSlotObjectBase::call(QObject*, void**) (a=0x7fffffffbc20, r=0x555555eb51c0, this=<optimized out>)
    at /src/qt5/build2/qtbase/include/QtCore/../../../../qtbase/src/corelib/kernel/qobjectdefs_impl.h:469
#10 doActivate<false>(QObject*, int, void**) (sender=0x555555f64970, signal_index=7, argv=0x7fffffffbc20)
    at /src/qt5/qtbase/src/corelib/kernel/qobject.cpp:4043
#11 0x00007fffeb1d3f07 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**)
    (sender=<optimized out>, m=m@entry=0x7fffeb6a18c0 <QItemSelectionModel::staticMetaObject>, local_signal_index=local_signal_index@entry=4, argv=argv@entry=0x7fffffffbc20) at /src/qt5/qtbase/src/corelib/kernel/qobject.cpp:4103
#12 0x00007fffeb41aa66 in QItemSelectionModel::modelChanged(QAbstractItemModel*) (this=<optimized out>, _t1=<optimized out>)
    at /src/qt5/build2/qtbase/src/corelib/Core_autogen/include/moc_qitemselectionmodel.cpp:518
#13 0x00007fffeb1dc4dd in QtPrivate::QSlotObjectBase::call(QObject*, void**) (a=0x7fffffffbd30, r=0x555555f64970, this=<optimized out>)
    at /src/qt5/build2/qtbase/include/QtCore/../../../../qtbase/src/corelib/kernel/qobjectdefs_impl.h:469
#14 doActivate<false>(QObject*, int, void**) (sender=0x555555b523d0, signal_index=0, argv=0x7fffffffbd30)
    at /src/qt5/qtbase/src/corelib/kernel/qobject.cpp:4043
#15 0x00007fffeb1d3f07 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**)
--Type <RET> for more, q to quit, c to continue without paging--
    (sender=sender@entry=0x555555b523d0, m=m@entry=0x7fffeb696b80 <QObject::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fffffffbd30) at /src/qt5/qtbase/src/corelib/kernel/qobject.cpp:4103
#16 0x00007fffeb1d3fc3 in QObject::destroyed(QObject*) (this=this@entry=0x555555b523d0, _t1=<optimized out>, _t1@entry=0x555555b523d0)
    at /src/qt5/build2/qtbase/src/corelib/kernel/moc_qobject.cpp:227
#17 0x00007fffeb1d9c62 in QObject::~QObject() (this=0x555555b523d0, __in_chrg=<optimized out>)
    at /src/qt5/qtbase/src/corelib/kernel/qobject.cpp:1070
#18 0x00007fffea52e06d in MailCommon::FolderTreeWidgetProxyModel::~FolderTreeWidgetProxyModel()
    (this=0x555555b523d0, __in_chrg=<optimized out>) at /src/kdesrc/mailcommon/src/folder/foldertreewidgetproxymodel.cpp:91
#19 0x00007fffeb1d4ba9 in QObjectPrivate::deleteChildren() (this=this@entry=0x555555b17180)
    at /src/qt5/qtbase/src/corelib/kernel/qobject.cpp:2215
#20 0x00007fffec3e4f08 in QWidget::~QWidget() (this=0x555555b1a5f0, __in_chrg=<optimized out>)
    at /src/qt5/qtbase/src/widgets/kernel/qwidget.cpp:1524
#21 0x00007fffea52bd0d in MailCommon::FolderTreeWidget::~FolderTreeWidget() (this=0x555555b1a5f0, __in_chrg=<optimized out>)
    at /src/kdesrc/mailcommon/src/folder/foldertreewidget.cpp:131
#22 0x00007fffeb1d4ba9 in QObjectPrivate::deleteChildren() (this=this@entry=0x555555e32950)
    at /src/qt5/qtbase/src/corelib/kernel/qobject.cpp:2215
#23 0x00007fffec3e4f08 in QWidget::~QWidget() (this=0x55555634be60, __in_chrg=<optimized out>)
    at /src/qt5/qtbase/src/widgets/kernel/qwidget.cpp:1524
#24 0x00007fffec5945bd in QSplitter::~QSplitter() (this=0x55555634be60, __in_chrg=<optimized out>)
    at /src/qt5/qtbase/src/widgets/widgets/qsplitter.cpp:951
#25 0x00007fffeb1d4ba9 in QObjectPrivate::deleteChildren() (this=this@entry=0x555555cdfba0)
    at /src/qt5/qtbase/src/corelib/kernel/qobject.cpp:2215
#26 0x00007fffec3e4f08 in QWidget::~QWidget() (this=0x555555e56560, __in_chrg=<optimized out>)
    at /src/qt5/qtbase/src/widgets/kernel/qwidget.cpp:1524
#27 0x00007fffec5945bd in QSplitter::~QSplitter() (this=0x555555e56560, __in_chrg=<optimized out>)
    at /src/qt5/qtbase/src/widgets/widgets/qsplitter.cpp:951
#28 0x00007ffff7e6ed87 in KMMainWidget::deleteWidgets() (this=this@entry=0x555555984cb0) at /src/kdesrc/kmail/src/kmmainwidget.cpp:985
#29 0x00007ffff7e94156 in KMMainWidget::destruct() (this=0x555555984cb0) at /src/kdesrc/kmail/src/kmmainwidget.cpp:392
#30 KMMainWidget::destruct() (this=0x555555984cb0) at /src/kdesrc/kmail/src/kmmainwidget.cpp:381
#31 0x00007ffff7e942e7 in KMMainWidget::~KMMainWidget() (this=0x555555984cb0, __in_chrg=<optimized out>)
    at /src/kdesrc/kmail/src/kmmainwidget.cpp:376
#32 0x00007ffff7e9453d in KMMainWidget::~KMMainWidget() (this=0x555555984cb0, __in_chrg=<optimized out>)
--Type <RET> for more, q to quit, c to continue without paging--
    at /src/kdesrc/kmail/src/kmmainwidget.cpp:377
#33 0x00007fffeb1d4ba9 in QObjectPrivate::deleteChildren() (this=this@entry=0x55555588d470)
    at /src/qt5/qtbase/src/corelib/kernel/qobject.cpp:2215
#34 0x00007fffec3e4f08 in QWidget::~QWidget() (this=0x555555ac2970, __in_chrg=<optimized out>)
    at /src/qt5/qtbase/src/widgets/kernel/qwidget.cpp:1524
#35 0x00007fffec3e505d in QWidget::~QWidget() (this=0x555555ac2970, __in_chrg=<optimized out>)
    at /src/qt5/qtbase/src/widgets/kernel/qwidget.cpp:1550
#36 0x00007fffeb1d4ba9 in QObjectPrivate::deleteChildren() (this=this@entry=0x55555597f500)
    at /src/qt5/qtbase/src/corelib/kernel/qobject.cpp:2215
#37 0x00007fffec3e4f08 in QWidget::~QWidget() (this=this@entry=0x555555abe890, __in_chrg=<optimized out>)
    at /src/qt5/qtbase/src/widgets/kernel/qwidget.cpp:1524
#38 0x00007fffec5291a1 in QMainWindow::~QMainWindow() (this=this@entry=0x555555abe890, __in_chrg=<optimized out>)
    at /src/qt5/qtbase/src/widgets/widgets/qmainwindow.cpp:340
#39 0x00007fffeca3c5f1 in KMainWindow::~KMainWindow() (this=this@entry=0x555555abe890, __in_chrg=<optimized out>)
    at /src/kdesrc/kxmlgui/src/kmainwindow.cpp:433
#40 0x00007fffeca8302f in KXmlGuiWindow::~KXmlGuiWindow()
    (this=this@entry=0x555555abe890, __vtt_parm=__vtt_parm@entry=0x7ffff7f84ef8 <VTT for KMMainWin+8>, __in_chrg=<optimized out>)
    at /src/kdesrc/kxmlgui/src/kxmlguiwindow.cpp:217
#41 0x00007ffff7e1c70b in KMMainWin::~KMMainWin() (this=0x555555abe890, __in_chrg=<optimized out>, __vtt_parm=<optimized out>)
    at /src/kdesrc/kmail/src/kmmainwin.cpp:143
#42 0x00007ffff7e1c76d in KMMainWin::~KMMainWin() (this=0x555555abe890, __in_chrg=<optimized out>, __vtt_parm=<optimized out>)
    at /src/kdesrc/kmail/src/kmmainwin.cpp:143
#43 0x00007fffeb1ceb75 in QObject::event(QEvent*) (this=this@entry=0x555555abe890, e=e@entry=0x55555c1bd690)
    at /src/qt5/qtbase/src/corelib/kernel/qobject.cpp:1433
#44 0x00007fffec3e9516 in QWidget::event(QEvent*) (this=this@entry=0x555555abe890, event=event@entry=0x55555c1bd690)
    at /src/qt5/qtbase/src/widgets/kernel/qwidget.cpp:9422
#45 0x00007fffec52b627 in QMainWindow::event(QEvent*) (this=this@entry=0x555555abe890, event=event@entry=0x55555c1bd690)
    at /src/qt5/qtbase/src/widgets/widgets/qmainwindow.cpp:1328
#46 0x00007fffeca3d145 in KMainWindow::event(QEvent*) (this=this@entry=0x555555abe890, ev=ev@entry=0x55555c1bd690)
    at /src/kdesrc/kxmlgui/src/kmainwindow.cpp:905
#47 0x00007fffeca86330 in KXmlGuiWindow::event(QEvent*) (this=0x555555abe890, ev=0x55555c1bd690)
    at /src/kdesrc/kxmlgui/src/kxmlguiwindow.cpp:221
--Type <RET> for more, q to quit, c to continue without paging--
#48 0x00007fffec38ee05 in QApplicationPrivate::notify_helper(QObject*, QEvent*)
    (this=<optimized out>, receiver=0x555555abe890, e=0x55555c1bd690) at /src/qt5/qtbase/src/widgets/kernel/qapplication.cpp:3298
#49 0x00007fffeb1732c0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=0x555555abe890, event=0x55555c1bd690)
    at /src/qt5/qtbase/src/corelib/kernel/qcoreapplication.cpp:1134
#50 0x00007fffeb1734dd in QCoreApplication::sendEvent(QObject*, QEvent*) (receiver=<optimized out>, event=<optimized out>)
    at /src/qt5/qtbase/src/corelib/kernel/qcoreapplication.cpp:1575
#51 0x00007fffeb1771cf in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*)
    (receiver=0x0, event_type=0, data=0x5555555a5d20) at /src/qt5/qtbase/src/corelib/kernel/qcoreapplication.cpp:1946
#52 0x00007fffeb17746c in QCoreApplication::sendPostedEvents(QObject*, int) (receiver=<optimized out>, event_type=<optimized out>)
    at /src/qt5/qtbase/src/corelib/kernel/qcoreapplication.cpp:1803
#53 0x00007fffeb47caf7 in postEventSourceDispatch(GSource*, GSourceFunc, gpointer) (s=0x5555558919b0)
    at /src/qt5/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:244
#54 0x00007fffe642b50d in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#55 0x00007fffe64862f8 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#56 0x00007fffe642a220 in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#57 0x00007fffeb47c380 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x555555890440, flags=...)
    at /src/qt5/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:394
#58 0x00007fffeb18019b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fffffffc710, flags=...,
    flags@entry=...) at /src/qt5/build2/qtbase/include/QtCore/../../../../qtbase/src/corelib/global/qflags.h:34
#59 0x00007fffeb17c73a in QCoreApplication::exec() ()
    at /src/qt5/build2/qtbase/include/QtCore/../../../../qtbase/src/corelib/global/qflags.h:74
#60 0x00007fffeb9ce4c0 in QGuiApplication::exec() () at /src/qt5/qtbase/src/gui/kernel/qguiapplication.cpp:1926
#61 0x00007fffec38ed79 in QApplication::exec() () at /src/qt5/qtbase/src/widgets/kernel/qapplication.cpp:2568
#62 0x0000555555559bab in main(int, char**) (argc=<optimized out>, argv=<optimized out>) at /src/kdesrc/kmail/src/main.cpp:174