Application: kmail (6.2.1 (24.08.1))
 (Compiled from sources)
Qt Version: 6.7.2
Frameworks Version: 6.6.0
Operating System: Linux 6.6.52-gentoo x86_64
Windowing System: X11
Distribution: "Gentoo Linux"
DrKonqi: 6.1.5 [KCrashBackend]

-- Information about the crash:
Another crash on startup ... I was changing visual style and it crashed after applying changes; when trying to start kmail again, it crashes repeatedly.

The crash can be reproduced sometimes.

-- Backtrace:
Application: KMail (kmail), signal: Segmentation fault

[KCrash Handler]
#4  0x00007fba070480dd in KMMainWidget::slotHistorySwitchFolder(Akonadi::Collection const&) () at /usr/lib64/libkmailprivate.so.6
#5  0x00007fb9ff4ed9f7 in void doActivate<false>(QObject*, int, void**) () at /usr/lib64/libQt6Core.so.6
#6  0x00007fb9fdb5ca9a in Akonadi::EntityTreeView::currentChanged(Akonadi::Collection const&) () at /usr/lib64/libKPim6AkonadiWidgets.so.6
#7  0x00007fb9fdb5d595 in Akonadi::EntityTreeViewPrivate::itemCurrentChanged(QModelIndex const&) const () at /usr/lib64/libKPim6AkonadiWidgets.so.6
#8  0x00007fb9ff4ed9f7 in void doActivate<false>(QObject*, int, void**) () at /usr/lib64/libQt6Core.so.6
#9  0x00007fb9ff3aaf50 in QItemSelectionModel::currentChanged(QModelIndex const&, QModelIndex const&) () at /usr/lib64/libQt6Core.so.6
#10 0x00007fb9ff3eb6ac in QItemSelectionModel::setCurrentIndex(QModelIndex const&, QFlags<QItemSelectionModel::SelectionFlag>) () at /usr/lib64/libQt6Core.so.6
#11 0x00007fb9fcf3661a in KViewStateSerializerPrivate::restoreCurrentItem() () at /usr/lib64/libKF6WidgetsAddons.so.6
#12 0x00007fb9fcf366b8 in KViewStateSerializer::restoreCurrentItem(QString const&) () at /usr/lib64/libKF6WidgetsAddons.so.6
#13 0x00007fb9fe9209a9 in MessageList::Pane::restoreHeaderSettings(int, bool) () at /usr/lib64/libKPim6MessageList.so.6
#14 0x00007fb9fe920c6b in MessageList::Pane::readConfig(bool) () at /usr/lib64/libKPim6MessageList.so.6
#15 0x00007fb9fe92133d in MessageList::Pane::Pane(bool, QAbstractItemModel*, QItemSelectionModel*, QWidget*) () at /usr/lib64/libKPim6MessageList.so.6
#16 0x00007fba06fd5973 in CollectionPane::CollectionPane(bool, QAbstractItemModel*, QItemSelectionModel*, QWidget*) () at /usr/lib64/libkmailprivate.so.6
#17 0x00007fba07045509 in KMMainWidget::createWidgets() () at /usr/lib64/libkmailprivate.so.6
#18 0x00007fba07046f8d in KMMainWidget::KMMainWidget(QWidget*, KXMLGUIClient*, KActionCollection*, QExplicitlySharedDataPointer<KSharedConfig> const&) () at /usr/lib64/libkmailprivate.so.6
#19 0x00007fba06fed174 in KMMainWin::KMMainWin(QWidget*) [clone .isra.0] () at /usr/lib64/libkmailprivate.so.6
#20 0x00007fba06ffb354 in KMKernel::openReader(bool, bool) () at /usr/lib64/libkmailprivate.so.6
#21 0x00007fba07000c98 in KMKernel::action(bool, bool, bool, bool, QString const&, QString const&, QString const&, QString const&, QString const&, QUrl const&, QList<QUrl> const&, QList<QString> const&, QString const&, QString const&, QString const&) () at /usr/lib64/libkmailprivate.so.6
#22 0x00007fba07000fea in KMKernel::handleCommandLine(bool, QList<QString> const&, QString const&) () at /usr/lib64/libkmailprivate.so.6
#23 0x000055595a158e6e in KMailApplication::activate(QList<QString> const&, QString const&) ()
#24 0x000055595a15894c in main ()
[Inferior 1 (process 4041) detached]

Reported using DrKonqi