Application: dolphin (20.12.3)
 (Compiled from sources)
Qt Version: 5.15.2
Frameworks Version: 5.82.0
Operating System: Linux 5.10.27-gentoo-x86_64 x86_64
Windowing System: X11
Drkonqi Version: 5.21.5
Distribution: Gentoo/Linux

-- Information about the crash:
- What I was doing when the application crashed: Just like preceding report. Tried to colllapse tree viewin ~/.local/share/akonadi/... snd it died.

The crash can be reproduced every time.

-- Backtrace:
Application: Dolphin (dolphin), signal: Segmentation fault

[KCrash Handler]
#4  0x00007f5ebcc734bc in KFileItem::~KFileItem() () from /usr/lib64/libKF5KIOCore.so.5
#5  0x00007f5ebd26876d in KFileItemModel::removeItems(KItemRangeList const&, KFileItemModel::RemoveItemsBehavior) () from /usr/lib64/libdolphinprivate.so.5
#6  0x00007f5ebd27424a in KFileItemModel::setExpanded(int, bool) () from /usr/lib64/libdolphinprivate.so.5
#7  0x00007f5ebd285e41 in KItemListController::onRelease(QPointF const&, QFlags<Qt::KeyboardModifier>, QFlags<Qt::MouseButton>, bool) () from /usr/lib64/libdolphinprivate.so.5
#8  0x00007f5ebd285fe5 in KItemListController::mouseReleaseEvent(QGraphicsSceneMouseEvent*, QTransform const&) () from /usr/lib64/libdolphinprivate.so.5
#9  0x00007f5ebd288a59 in KItemListController::processEvent(QEvent*, QTransform const&) () from /usr/lib64/libdolphinprivate.so.5
#10 0x00007f5ebd29895d in KItemListView::event(QEvent*) () from /usr/lib64/libdolphinprivate.so.5
#11 0x00007f5ebbea3d8f in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#12 0x00007f5ebbeaca40 in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#13 0x00007f5ebb424bc8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib64/libQt5Core.so.5
#14 0x00007f5ebc1cbe83 in ?? () from /usr/lib64/libQt5Widgets.so.5
#15 0x00007f5ebc1cc2ae in ?? () from /usr/lib64/libQt5Widgets.so.5
#16 0x00007f5ebc1d12ac in QGraphicsScene::mouseReleaseEvent(QGraphicsSceneMouseEvent*) () from /usr/lib64/libQt5Widgets.so.5
#17 0x00007f5ebc1de708 in QGraphicsScene::event(QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#18 0x00007f5ebbea3d8f in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#19 0x00007f5ebbeaca40 in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#20 0x00007f5ebb424bc8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib64/libQt5Core.so.5
#21 0x00007f5ebc1fb566 in QGraphicsView::mouseReleaseEvent(QMouseEvent*) () from /usr/lib64/libQt5Widgets.so.5
#22 0x00007f5ebbee5d38 in QWidget::event(QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#23 0x00007f5ebbf93d8e in QFrame::event(QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#24 0x00007f5ebc1fc32c in QGraphicsView::viewportEvent(QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#25 0x00007f5ebb424985 in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib64/libQt5Core.so.5
#26 0x00007f5ebbea3d7e in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#27 0x00007f5ebbeacd03 in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#28 0x00007f5ebb424bc8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib64/libQt5Core.so.5
#29 0x00007f5ebbeabeb4 in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool, bool) () from /usr/lib64/libQt5Widgets.so.5
#30 0x00007f5ebbf0073c in ?? () from /usr/lib64/libQt5Widgets.so.5
#31 0x00007f5ebbf0396c in ?? () from /usr/lib64/libQt5Widgets.so.5
#32 0x00007f5ebbea3d8f in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#33 0x00007f5ebbeaca40 in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#34 0x00007f5ebb424bc8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib64/libQt5Core.so.5
#35 0x00007f5ebb8d38b3 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () from /usr/lib64/libQt5Gui.so.5
#36 0x00007f5ebb8b437b in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Gui.so.5
#37 0x00007f5eb6aa73ba in ?? () from /usr/lib64/libQt5XcbQpa.so.5
#38 0x00007f5eb9467acb in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#39 0x00007f5eb9467d78 in ?? () from /usr/lib64/libglib-2.0.so.0
#40 0x00007f5eb9467e2f in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#41 0x00007f5ebb46fa1b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#42 0x00007f5ebb423673 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#43 0x00007f5ebb42b010 in QCoreApplication::exec() () from /usr/lib64/libQt5Core.so.5
#44 0x00007f5ebd53214d in kdemain () from /usr/lib64/libkdeinit5_dolphin.so
#45 0x00007f5ebd34e7fd in __libc_start_main () from /lib64/libc.so.6
#46 0x000055c5e805308a in _start ()
[Inferior 1 (process 5815) detached]

Reported using DrKonqi