Application: dolphin (20.08.3)
 (Compiled from sources)
Qt Version: 5.15.2
Frameworks Version: 5.77.0
Operating System: Linux 5.4.80-gentoo-x86_64 x86_64
Windowing system: X11
Distribution: Gentoo/Linux

-- Information about the crash:
- What I was doing when the application crashed: I do daily backups of my important data files using rsync. Yesterday I did a large amount of archiving email from the year 2020 (I keep about 3 GiB of emsil archives, in total). After running the rsync script, I started Dolphin to look at the backed up copy of the email archive, which had been recetnly reorganized. It worked fine at first -- I drilled all the way down (tree view) through 4 levels of directories to an actual list of files. The crash occuirred when I clicked the down arrow to collapse the file list. No other application programs were running except yakuake and the usual cadre of kde framework stuff.
I started dolphin again, repeated my previous sequence of actions, and boom! It died the same way. The only difference I can see is that the "KDE Crash Handler" was running the second time it crashed.
I should mention that i re-compiled a lot of kde-framework packages just two days ago, on 11 January. Big package upgrade at Gentoo (I try to run emerge --sync once a day). 60 packages were affected. Upgraded from 5.74 to 5.77. It took 7.5 hours to compile those 60 packages (I maintain a complete set of "portage" log files for all 1288 packages installed on my system). The day before (10 January) I installed qt5.15.2 and a few additional packages (firefox, libre-office) dependent on qt. 4.5 hours for that one, My poor CPUs are getting tired.  :-)

The crash can be reproduced every time.

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

[KCrash Handler]
#4  0x00007fe460073aec in KFileItem::~KFileItem() () from /usr/lib64/libKF5KIOCore.so.5
#5  0x00007fe4606d3c10 in KFileItemModel::removeItems(KItemRangeList const&, KFileItemModel::RemoveItemsBehavior) () from /usr/lib64/libdolphinprivate.so.5
#6  0x00007fe4606e0a65 in KFileItemModel::setExpanded(int, bool) () from /usr/lib64/libdolphinprivate.so.5
#7  0x00007fe4606f4e00 in KItemListController::mouseReleaseEvent(QGraphicsSceneMouseEvent*, QTransform const&) () from /usr/lib64/libdolphinprivate.so.5
#8  0x00007fe4606f6321 in KItemListController::processEvent(QEvent*, QTransform const&) () from /usr/lib64/libdolphinprivate.so.5
#9  0x00007fe4607053f6 in KItemListView::event(QEvent*) () from /usr/lib64/libdolphinprivate.so.5
#10 0x00007fe45f21fd8f in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#11 0x00007fe45f228a40 in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#12 0x00007fe45e74b337 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib64/libQt5Core.so.5
#13 0x00007fe45f547e83 in ?? () from /usr/lib64/libQt5Widgets.so.5
#14 0x00007fe45f5482ae in ?? () from /usr/lib64/libQt5Widgets.so.5
#15 0x00007fe45f54d2ac in QGraphicsScene::mouseReleaseEvent(QGraphicsSceneMouseEvent*) () from /usr/lib64/libQt5Widgets.so.5
#16 0x00007fe45f55a708 in QGraphicsScene::event(QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#17 0x00007fe45f21fd8f in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#18 0x00007fe45f228a40 in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#19 0x00007fe45e74b337 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib64/libQt5Core.so.5
#20 0x00007fe45f577566 in QGraphicsView::mouseReleaseEvent(QMouseEvent*) () from /usr/lib64/libQt5Widgets.so.5
#21 0x00007fe45f261d38 in QWidget::event(QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#22 0x00007fe45f30fd8e in QFrame::event(QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#23 0x00007fe45f57832c in QGraphicsView::viewportEvent(QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#24 0x00007fe45e74b146 in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib64/libQt5Core.so.5
#25 0x00007fe45f21fd7e in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#26 0x00007fe45f228d03 in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#27 0x00007fe45e74b337 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib64/libQt5Core.so.5
#28 0x00007fe45f227eb4 in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool, bool) () from /usr/lib64/libQt5Widgets.so.5
#29 0x00007fe45f27c73c in ?? () from /usr/lib64/libQt5Widgets.so.5
#30 0x00007fe45f27f96c in ?? () from /usr/lib64/libQt5Widgets.so.5
#31 0x00007fe45f21fd8f in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#32 0x00007fe45f228a40 in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#33 0x00007fe45e74b337 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib64/libQt5Core.so.5
#34 0x00007fe45ec25e98 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () from /usr/lib64/libQt5Gui.so.5
#35 0x00007fe45ec27715 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /usr/lib64/libQt5Gui.so.5
#36 0x00007fe45ec0223b in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Gui.so.5
#37 0x00007fe459d64a0a in ?? () from /usr/lib64/libQt5XcbQpa.so.5
#38 0x00007fe45c655867 in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#39 0x00007fe45c655af0 in ?? () from /usr/lib64/libglib-2.0.so.0
#40 0x00007fe45c655b7f in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#41 0x00007fe45e7a0a3d in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#42 0x00007fe45e74a163 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#43 0x00007fe45e7520c0 in QCoreApplication::exec() () from /usr/lib64/libQt5Core.so.5
#44 0x00007fe4609a2cbf in kdemain () from /usr/lib64/libkdeinit5_dolphin.so
#45 0x00007fe4607c1ebb in __libc_start_main () from /lib64/libc.so.6
#46 0x000055ac8f4a408a in _start ()
[Inferior 1 (process 14214) detached]

The reporter indicates this bug may be a duplicate of or related to bug 422282.

Possible duplicates by query: bug 431038, bug 430998, bug 430918, bug 430505, bug 430351.

Reported using DrKonqi