Application: Dolphin (dolphin), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f90b77fb800 (LWP 6728))]

Thread 6 (Thread 0x7f90877fe700 (LWP 6753)):
#0 0x00007f90b708b97b in poll () at /usr/lib/libc.so.6
#1 0x00007f90a983aff3 in () at /usr/lib/libglib-2.0.so.0
#2 0x00007f90a983b10e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3 0x00007f90b1109314 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4 0x00007f90b10ab3db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5 0x00007f90b0eba7ae in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6 0x00007f90b0ebfb4d in () at /usr/lib/libQt5Core.so.5
#7 0x00007f90abee708c in start_thread () at /usr/lib/libpthread.so.0
#8 0x00007f90b7095e7f in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f9087fff700 (LWP 6752)):
#0 0x00007f90abeed3bd in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1 0x00007f909678efbc in () at /usr/lib/dri/r600_dri.so
#2 0x00007f909678eec8 in () at /usr/lib/dri/r600_dri.so
#3 0x00007f90abee708c in start_thread () at /usr/lib/libpthread.so.0
#4 0x00007f90b7095e7f in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f909532f700 (LWP 6751)):
#0 0x00007f90abeed3bd in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1 0x00007f909678efbc in () at /usr/lib/dri/r600_dri.so
#2 0x00007f909678eec8 in () at /usr/lib/dri/r600_dri.so
#3 0x00007f90abee708c in start_thread () at /usr/lib/libpthread.so.0
#4 0x00007f90b7095e7f in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f909d92f700 (LWP 6748)):
#0 0x00007f90b70873d8 in read () at /usr/lib/libc.so.6
#1 0x00007f90a98807d1 in () at /usr/lib/libglib-2.0.so.0
#2 0x00007f90a983aac8 in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#3 0x00007f90a983af96 in () at /usr/lib/libglib-2.0.so.0
#4 0x00007f90a983b10e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5 0x00007f90b1109314 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6 0x00007f90b10ab3db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7 0x00007f90b0eba7ae in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8 0x00007f90b152c416 in () at /usr/lib/libQt5DBus.so.5
#9 0x00007f90b0ebfb4d in () at /usr/lib/libQt5Core.so.5
#10 0x00007f90abee708c in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007f90b7095e7f in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f909feef700 (LWP 6747)):
#0 0x00007f90b708b97b in poll () at /usr/lib/libc.so.6
#1 0x00007f90a91648e0 in () at /usr/lib/libxcb.so.1
#2 0x00007f90a9166679 in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3 0x00007f90a2ac582a in () at /usr/lib/libQt5XcbQpa.so.5
#4 0x00007f90b0ebfb4d in () at /usr/lib/libQt5Core.so.5
#5 0x00007f90abee708c in start_thread () at /usr/lib/libpthread.so.0
#6 0x00007f90b7095e7f in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f90b77fb800 (LWP 6728)):
[KCrash Handler]
#5 0x00007f90702c18f4 in () at /usr/lib/libQtGui.so.4
#6 0x00007f90b764f47a in call_init.part () at /lib64/ld-linux-x86-64.so.2
#7 0x00007f90b764f586 in _dl_init () at /lib64/ld-linux-x86-64.so.2
#8 0x00007f90b7653a5e in dl_open_worker () at /lib64/ld-linux-x86-64.so.2
#9 0x00007f90b70d1b64 in _dl_catch_error () at /usr/lib/libc.so.6
#10 0x00007f90b765327a in _dl_open () at /lib64/ld-linux-x86-64.so.2
#11 0x00007f90a9b08e86 in () at /usr/lib/libdl.so.2
#12 0x00007f90b70d1b64 in _dl_catch_error () at /usr/lib/libc.so.6
#13 0x00007f90a9b09587 in () at /usr/lib/libdl.so.2
#14 0x00007f90a9b08f22 in dlopen () at /usr/lib/libdl.so.2
#15 0x00007f9077da3ef1 in () at /usr/lib/libvlccore.so.8
#16 0x00007f9077d87a1a in () at /usr/lib/libvlccore.so.8
#17 0x00007f9077d88012 in () at /usr/lib/libvlccore.so.8
#18 0x00007f9077d88762 in () at /usr/lib/libvlccore.so.8
#19 0x00007f9077d88b7b in () at /usr/lib/libvlccore.so.8
#20 0x00007f9077d0c22f in libvlc_InternalInit () at /usr/lib/libvlccore.so.8
#21 0x00007f9077ad7183 in libvlc_new () at /usr/lib/libvlc.so.5
#22 0x00007f908425684a in () at /usr/lib/qt5/plugins/phonon4qt5_backend/phonon_vlc.so
#23 0x00007f908422969c in () at /usr/lib/qt5/plugins/phonon4qt5_backend/phonon_vlc.so
#24 0x00007f908425b15a in qt_plugin_instance () at /usr/lib/qt5/plugins/phonon4qt5_backend/phonon_vlc.so
#25 0x00007f90b10901b7 in QPluginLoader::instance() () at /usr/lib/libQt5Core.so.5
#26 0x00007f90b2801011 in () at /usr/lib/libphonon4qt5.so.4
#27 0x00007f90b280319e in () at /usr/lib/libphonon4qt5.so.4
#28 0x00007f90b2803f01 in () at /usr/lib/libphonon4qt5.so.4
#29 0x00007f90b2804ddc in Phonon::Factory::backend(bool) () at /usr/lib/libphonon4qt5.so.4
#30 0x00007f90b28056ea in () at /usr/lib/libphonon4qt5.so.4
#31 0x00007f90b27f6e62 in () at /usr/lib/libphonon4qt5.so.4
#32 0x00007f90b2fae18c in () at /usr/lib/libKF5Notifications.so.5
#33 0x00007f90b2f82847 in () at /usr/lib/libKF5Notifications.so.5
#34 0x00007f90b2f7d7d6 in KNotification::sendEvent() () at /usr/lib/libKF5Notifications.so.5
#35 0x00007f90b10de112 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#36 0x00007f90b20c1fec in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#37 0x00007f90b20c99c6 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#38 0x00007f90b10acda0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#39 0x00007f90b10afa06 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#40 0x00007f90b1109d04 in () at /usr/lib/libQt5Core.so.5
#41 0x00007f90a983ae38 in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#42 0x00007f90a983b081 in () at /usr/lib/libglib-2.0.so.0
#43 0x00007f90a983b10e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#44 0x00007f90b11092f1 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#45 0x00007f90a2b4d482 in () at /usr/lib/libQt5XcbQpa.so.5
#46 0x00007f90b10ab3db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#47 0x00007f90b22b969b in QDialog::exec() () at /usr/lib/libQt5Widgets.so.5
#48 0x00007f90b392e24b in KMessageBox::createKMessageBox(QDialog*, QDialogButtonBox*, QIcon const&, QString const&, QStringList const&, QString const&, bool*, QFlags<KMessageBox::Option>, QString const&, QMessageBox::Icon) () at /usr/lib/libKF5WidgetsAddons.so.5
#49 0x00007f90b392e45d in KMessageBox::createKMessageBox(QDialog*, QDialogButtonBox*, QMessageBox::Icon, QString const&, QStringList const&, QString const&, bool*, QFlags<KMessageBox::Option>, QString const&) () at /usr/lib/libKF5WidgetsAddons.so.5
#50 0x00007f90b39350e5 in KMessageBox::warningContinueCancelList(QWidget*, QString const&, QStringList const&, QString const&, KGuiItem const&, KGuiItem const&, QString const&, QFlags<KMessageBox::Option>) () at /usr/lib/libKF5WidgetsAddons.so.5
#51 0x00007f90b5dc8d15 in KIO::JobUiDelegate::askDeleteConfirmation(QList<QUrl> const&, KIO::JobUiDelegateExtension::DeletionType, KIO::JobUiDelegateExtension::ConfirmationType) () at /usr/lib/libKF5KIOWidgets.so.5
#52 0x00007f90b6d2da8b in DolphinView::trashSelectedItems() () at /usr/lib/libdolphinprivate.so.5
#53 0x00007f90b10dd7ef in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#54 0x00007f90b20bb533 in QAction::triggered(bool) () at /usr/lib/libQt5Widgets.so.5
#55 0x00007f90b20bddb6 in QAction::activate(QAction::ActionEvent) () at /usr/lib/libQt5Widgets.so.5
#56 0x00007f90b10dd7ef in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#57 0x00007f90b20bb533 in QAction::triggered(bool) () at /usr/lib/libQt5Widgets.so.5
#58 0x00007f90b20bddb6 in QAction::activate(QAction::ActionEvent) () at /usr/lib/libQt5Widgets.so.5
#59 0x00007f90b2244515 in () at /usr/lib/libQt5Widgets.so.5
#60 0x00007f90b224bbdc in () at /usr/lib/libQt5Widgets.so.5
#61 0x00007f90b224ca44 in QMenu::mouseReleaseEvent(QMouseEvent*) () at /usr/lib/libQt5Widgets.so.5
#62 0x00007f90b2102188 in QWidget::event(QEvent*) () at /usr/lib/libQt5Widgets.so.5
#63 0x00007f90b224ed7c in QMenu::event(QEvent*) () at /usr/lib/libQt5Widgets.so.5
#64 0x00007f90b20c1fec in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#65 0x00007f90b20c9f41 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#66 0x00007f90b10acda0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#67 0x00007f90b20c8eca in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () at /usr/lib/libQt5Widgets.so.5
#68 0x00007f90b211d677 in () at /usr/lib/libQt5Widgets.so.5
#69 0x00007f90b2120060 in () at /usr/lib/libQt5Widgets.so.5
#70 0x00007f90b20c1fec in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#71 0x00007f90b20c99c6 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#72 0x00007f90b10acda0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#73 0x00007f90b18b0434 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () at /usr/lib/libQt5Gui.so.5
#74 0x00007f90b18b1f86 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () at /usr/lib/libQt5Gui.so.5
#75 0x00007f90b188929c in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Gui.so.5
#76 0x00007f90a2b4d48d in () at /usr/lib/libQt5XcbQpa.so.5
#77 0x00007f90b10ab3db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#78 0x00007f90b22498a6 in QMenu::exec(QPoint const&, QAction*) () at /usr/lib/libQt5Widgets.so.5
#79 0x00007f90b73ad556 in () at /usr/lib/libkdeinit5_dolphin.so
#80 0x00007f90b73aef88 in () at /usr/lib/libkdeinit5_dolphin.so
#81 0x00007f90b73a3d87 in () at /usr/lib/libkdeinit5_dolphin.so
#82 0x00007f90b10dd7ef in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#83 0x00007f90b6d56315 in DolphinView::requestContextMenu(QPoint const&, KFileItem const&, QUrl const&, QList<QAction*> const&) () at /usr/lib/libdolphinprivate.so.5
#84 0x00007f90b6d271d5 in DolphinView::slotItemContextMenuRequested(int, QPointF const&) () at /usr/lib/libdolphinprivate.so.5
#85 0x00007f90b10dd7ef in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#86 0x00007f90b6d54577 in KItemListController::itemContextMenuRequested(int, QPointF const&) () at /usr/lib/libdolphinprivate.so.5
#87 0x00007f90b6cdf942 in KItemListController::mousePressEvent(QGraphicsSceneMouseEvent*, QTransform const&) () at /usr/lib/libdolphinprivate.so.5
#88 0x00007f90b6cdeaec in KItemListController::processEvent(QEvent*, QTransform const&) () at /usr/lib/libdolphinprivate.so.5
#89 0x00007f90b6cf19c6 in KItemListView::event(QEvent*) () at /usr/lib/libdolphinprivate.so.5
#90 0x00007f90b20c1fec in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#91 0x00007f90b20c99c6 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#92 0x00007f90b10acda0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#93 0x00007f90b23d457c in () at /usr/lib/libQt5Widgets.so.5
#94 0x00007f90b23d4959 in () at /usr/lib/libQt5Widgets.so.5
#95 0x00007f90b23dc9eb in () at /usr/lib/libQt5Widgets.so.5
#96 0x00007f90b23dcc39 in QGraphicsScene::mousePressEvent(QGraphicsSceneMouseEvent*) () at /usr/lib/libQt5Widgets.so.5
#97 0x00007f90b23e3ee0 in QGraphicsScene::event(QEvent*) () at /usr/lib/libQt5Widgets.so.5
#98 0x00007f90b20c1fec in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#99 0x00007f90b20c99c6 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#100 0x00007f90b10acda0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#101 0x00007f90b240151d in QGraphicsView::mousePressEvent(QMouseEvent*) () at /usr/lib/libQt5Widgets.so.5
#102 0x00007f90b2102b0f in QWidget::event(QEvent*) () at /usr/lib/libQt5Widgets.so.5
#103 0x00007f90b21a5f0f in QFrame::event(QEvent*) () at /usr/lib/libQt5Widgets.so.5
#104 0x00007f90b240286c in QGraphicsView::viewportEvent(QEvent*) () at /usr/lib/libQt5Widgets.so.5
#105 0x00007f90b10aca6c in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#106 0x00007f90b20c1fc8 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#107 0x00007f90b20c9f41 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#108 0x00007f90b10acda0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#109 0x00007f90b20c8eca in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () at /usr/lib/libQt5Widgets.so.5
#110 0x00007f90b211d949 in () at /usr/lib/libQt5Widgets.so.5
#111 0x00007f90b2120060 in () at /usr/lib/libQt5Widgets.so.5
#112 0x00007f90b20c1fec in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#113 0x00007f90b20c99c6 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#114 0x00007f90b10acda0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#115 0x00007f90b18b0434 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () at /usr/lib/libQt5Gui.so.5
#116 0x00007f90b18b1f86 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () at /usr/lib/libQt5Gui.so.5
#117 0x00007f90b188929c in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Gui.so.5
#118 0x00007f90a2b4d48d in () at /usr/lib/libQt5XcbQpa.so.5
#119 0x00007f90b10ab3db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#120 0x00007f90b10b47d8 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#121 0x00007f90b739705e in kdemain () at /usr/lib/libkdeinit5_dolphin.so
#122 0x00007f90b6fc0f4a in __libc_start_main () at /usr/lib/libc.so.6
#123 0x0000559b3e5d877a in _start ()

I'd recommend submitting the bug request to bugs.kde.org. Please include details about what OS, Desktop + versions used, reproducibility, etc.