Thanks for the report, I could reproduce the issue.

(internal note: The current item [and I think at least a selected item] must be part of the deleted items for the crash)

Hm, I can't reproduce this. Are there any hints how to do it?

It seems that the list returned by "KFileItemList DolphinView::selectedItems()" contains a null KFileItem because the selection manager thinks that an item is selected which is not in the model any more. But I can't see how this is possible: When items are removed from the model, the selection manager is informed about it and should remove any removed items from its set of selected items.

Grrrmbl... I accidentally had a crash with exactly this backtrace yesterday but forgot to add a detailed description how to reproduce it: Now I'm unable to reproduce it again :-( When writing comment #1 I was quite sure it was related to the selection and the current item...

For me it hapend one or two more times. One thing in common that selections where made with mouse and the folders had large number of items

Created attachment 67121 [details]
New crash information added by DrKonqi

dolphin (1.99) on KDE Platform 4.7.95 (4.8 RC1 (4.7.95) using Qt 4.7.4

- What I was doing when the application crashed:

I deleted several folders @ once with a lot of files inside, the selection was done using the mouse, & the deletion was done using CTRL+Suppr

-- Backtrace (Reduced):
#6  0x00007f130f8462f3 in KFileItem::isDir (this=0x213f9b0) at /usr/src/debug/kdelibs-4.7.95/kio/kio/kfileitem.cpp:1049
#7  0x00007f130429f9fa in DolphinView::statusBarText (this=<optimized out>) at /usr/src/debug/kde-baseapps-4.7.95/dolphin/src/views/dolphinview.cpp:500
#8  0x00007f13049fadbd in DolphinViewContainer::updateStatusBar (this=0x186c910) at /usr/src/debug/kde-baseapps-4.7.95/dolphin/src/dolphinviewcontainer.cpp:323
#9  0x00007f13049fccd2 in DolphinViewContainer::qt_metacall (this=0x186c910, _c=QMetaObject::InvokeMetaMethod, _id=<optimized out>, _a=0x7fff332e4250) at /usr/src/debug/kde-baseapps-4.7.95/build/dolphin/src/dolphinviewcontainer.moc:134
[...]
#11 0x00007f1316f3c839 in QObject::event (this=0x18ef760, e=<optimized out>) at kernel/qobject.cpp:1181

I had the same crash, and it wasn't in a folder with loads of files. However, I also deleted multiple files at once, selected by mouse.

Created attachment 67187 [details]
New crash information added by DrKonqi

dolphin (2.0.95) on KDE Platform 4.7.4 (4.7.4) using Qt 4.8.0

- What I was doing when the application crashed:

Same issue that the reported bug, I selected a bunch of files and delete them, one by one steps are:

1-Selected a bunch of files, the selection was done using Ctrl+Click and the + symbol. The selection was NOT continous, meaning that I didn't selected entire rows
2-Pressed shift+del to delete the selected files
3-Accepted the warning
4-I saw animation
5-Crashed

-- Backtrace (Reduced):
#6  0x00007ff39b83b113 in KFileItem::isDir (this=0x1abcfd0) at /home/afiestas/cod3s/cpp/kde/source/kdelibs/kio/kio/kfileitem.cpp:1049
#7  0x00007ff39c3a07ca in DolphinView::statusBarText (this=<optimized out>) at /home/afiestas/cod3s/cpp/kde/source/kde-baseapps/dolphin/src/views/dolphinview.cpp:500
#8  0x00007ff39c85ca0d in DolphinViewContainer::updateStatusBar (this=0x159bbc0) at /home/afiestas/cod3s/cpp/kde/source/kde-baseapps/dolphin/src/dolphinviewcontainer.cpp:324
[...]
#10 0x00007ff398e71e49 in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#11 0x00007ff399ac0854 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4

Thanks for all your hints, I found a way now to reproduce the issue (although only in 1 out of 3 cases):
- Select all files of a directory (it seems the more items the directory has, the easier it is to reproduce)
- Deselect around 5 arbitrary files of the selection
- Move them to the trash

Will try to fix this during the next days...

I got the following backtrace (seems to be identical with the traces above but contains slightly more info):

Application: Dolphin (dolphin), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f6c83a22760 (LWP 10876))]

Thread 3 (Thread 0x7f6c7105a700 (LWP 10878)):
#0  0x00007f6c7d99b4f3 in poll () from /lib64/libc.so.6
#1  0x00007f6c7a4e7114 in ?? () from /lib64/libglib-2.0.so.0
#2  0x00007f6c7a4e7650 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007f6c7f475636 in QEventDispatcherGlib::processEvents (this=0x7dd9b0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007f6c7f449c22 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f6c7f449e35 in QEventLoop::exec (this=0x7f6c71059de0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007f6c7f35ebe4 in QThread::exec (this=<value optimized out>) at thread/qthread.cpp:498
#7  0x00007f6c7f42b358 in QInotifyFileSystemWatcherEngine::run (this=0x7dfec0) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f6c7f3614d5 in QThreadPrivate::start (arg=0x7dfec0) at thread/qthread_unix.cpp:331
#9  0x00007f6c7f0d0a3f in start_thread () from /lib64/libpthread.so.0
#10 0x00007f6c7d9a466d in clone () from /lib64/libc.so.6
#11 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f6c6b7fe700 (LWP 11003)):
#0  0x00007f6c7d99b4f3 in poll () from /lib64/libc.so.6
#1  0x00007f6c7a4e7114 in ?? () from /lib64/libglib-2.0.so.0
#2  0x00007f6c7a4e7650 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007f6c7f475636 in QEventDispatcherGlib::processEvents (this=0xa0dfd0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007f6c7f449c22 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f6c7f449e35 in QEventLoop::exec (this=0x7f6c6b7fdde0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007f6c7f35ebe4 in QThread::exec (this=<value optimized out>) at thread/qthread.cpp:498
#7  0x00007f6c7f42b358 in QInotifyFileSystemWatcherEngine::run (this=0xd253a0) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f6c7f3614d5 in QThreadPrivate::start (arg=0xd253a0) at thread/qthread_unix.cpp:331
#9  0x00007f6c7f0d0a3f in start_thread () from /lib64/libpthread.so.0
#10 0x00007f6c7d9a466d in clone () from /lib64/libc.so.6
#11 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f6c83a22760 (LWP 10876)):
[KCrash Handler]
#6  0x00007f6c81f7a956 in KFileItem::isDir (this=0x1780e40) at /home/kde4peter/kde/src/kdelibs/kio/kio/kfileitem.cpp:1049
#7  0x00007f6c826e6387 in DolphinView::statusBarText (this=0x927450) at /home/kde4peter/kde/src/kde-baseapps/dolphin/src/views/dolphinview.cpp:500
#8  0x00007f6c835f0cbd in DolphinViewContainer::updateStatusBar (this=0x8363f0) at /home/kde4peter/kde/src/kde-baseapps/dolphin/src/dolphinviewcontainer.cpp:324
#9  0x00007f6c835f0fe7 in DolphinViewContainer::slotFinishedPathLoading (this=0x8363f0) at /home/kde4peter/kde/src/kde-baseapps/dolphin/src/dolphinviewcontainer.cpp:370
#10 0x00007f6c835f214e in DolphinViewContainer::qt_metacall (this=0x8363f0, _c=QMetaObject::InvokeMetaMethod, _id=9, _a=0x7fff2d4092a0) at /home/kde4peter/kde/build/kde-baseapps/dolphin/src/dolphinviewcontainer.moc:137
#11 0x00007f6c7f45ee8f in QMetaObject::activate (sender=0x927450, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x7fff2d4092a0) at kernel/qobject.cpp:3287
#12 0x00007f6c826eb02b in DolphinView::finishedPathLoading (this=0x927450, _t1=...) at /home/kde4peter/kde/build/kde-baseapps/dolphin/src/dolphinview.moc:435
#13 0x00007f6c826e8a22 in DolphinView::slotLoadingCompleted (this=0x927450) at /home/kde4peter/kde/src/kde-baseapps/dolphin/src/views/dolphinview.cpp:1097
#14 0x00007f6c826ea79e in DolphinView::qt_metacall (this=0x927450, _c=QMetaObject::InvokeMetaMethod, _id=60, _a=0x7fff2d4093c0) at /home/kde4peter/kde/build/kde-baseapps/dolphin/src/dolphinview.moc:263
#15 0x00007f6c7f45ee8f in QMetaObject::activate (sender=0x89f5a0, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x0) at kernel/qobject.cpp:3287
#16 0x00007f6c826a9467 in KFileItemModel::loadingCompleted (this=0x89f5a0) at /home/kde4peter/kde/build/kde-baseapps/dolphin/src/kfileitemmodel.moc:109
#17 0x00007f6c826a1d9c in KFileItemModel::slotCompleted (this=0x89f5a0) at /home/kde4peter/kde/src/kde-baseapps/dolphin/src/kitemviews/kfileitemmodel.cpp:663
#18 0x00007f6c826a937f in KFileItemModel::qt_metacall (this=0x89f5a0, _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0x7fff2d409570) at /home/kde4peter/kde/build/kde-baseapps/dolphin/src/kfileitemmodel.moc:91
#19 0x00007f6c7f45ee8f in QMetaObject::activate (sender=0x90c530, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x0) at kernel/qobject.cpp:3287
#20 0x00007f6c81f5db1f in KDirLister::completed (this=0x90c530) at /home/kde4peter/kde/build/kdelibs/kio/kdirlister.moc:213
#21 0x00007f6c81f583a2 in KDirListerCache::slotUpdateResult (this=0x7fc0f0, j=0x165f4a0) at /home/kde4peter/kde/src/kdelibs/kio/kio/kdirlister.cpp:1807
#22 0x00007f6c81f5e3a8 in KDirListerCache::qt_metacall (this=0x7fc0f0, _c=QMetaObject::InvokeMetaMethod, _id=11, _a=0x7fff2d409a60) at /home/kde4peter/kde/build/kdelibs/kio/kdirlister_p.moc:108
#23 0x00007f6c7f45ee8f in QMetaObject::activate (sender=0x165f4a0, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x7fff2d409a60) at kernel/qobject.cpp:3287
#24 0x00007f6c7f8e5461 in KJob::result (this=0x165f4a0, _t1=0x165f4a0) at /home/kde4peter/kde/build/kdelibs/kdecore/kjob.moc:194
#25 0x00007f6c7f8e48cf in KJob::emitResult (this=0x165f4a0) at /home/kde4peter/kde/src/kdelibs/kdecore/jobs/kjob.cpp:318
#26 0x00007f6c81f3012c in KIO::SimpleJob::slotFinished (this=0x165f4a0) at /home/kde4peter/kde/src/kdelibs/kio/kio/job.cpp:494
#27 0x00007f6c81f39289 in KIO::ListJob::slotFinished (this=0x165f4a0) at /home/kde4peter/kde/src/kdelibs/kio/kio/job.cpp:2670
#28 0x00007f6c81f3bff0 in KIO::ListJob::qt_metacall (this=0x165f4a0, _c=QMetaObject::InvokeMetaMethod, _id=3, _a=0x7fff2d409d80) at /home/kde4peter/kde/build/kdelibs/kio/jobclasses.moc:821
#29 0x00007f6c7f45ee8f in QMetaObject::activate (sender=0xf14320, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x0) at kernel/qobject.cpp:3287
#30 0x00007f6c81ff1403 in KIO::SlaveInterface::finished (this=0xf14320) at /home/kde4peter/kde/build/kdelibs/kio/slaveinterface.moc:171
#31 0x00007f6c81fee999 in KIO::SlaveInterface::dispatch (this=0xf14320, _cmd=104, rawdata=...) at /home/kde4peter/kde/src/kdelibs/kio/kio/slaveinterface.cpp:172
#32 0x00007f6c81fee5ea in KIO::SlaveInterface::dispatch (this=0xf14320) at /home/kde4peter/kde/src/kdelibs/kio/kio/slaveinterface.cpp:88
#33 0x00007f6c81fe3a2f in KIO::Slave::gotInput (this=0xf14320) at /home/kde4peter/kde/src/kdelibs/kio/kio/slave.cpp:344
#34 0x00007f6c81fe4caf in KIO::Slave::qt_metacall (this=0xf14320, _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0x7fff2d40a2a0) at /home/kde4peter/kde/build/kdelibs/kio/slave.moc:82
#35 0x00007f6c7f45ee8f in QMetaObject::activate (sender=0xea6540, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x0) at kernel/qobject.cpp:3287
#36 0x00007f6c81efe0dd in KIO::Connection::readyRead (this=0xea6540) at /home/kde4peter/kde/build/kdelibs/kio/connection.moc:92
#37 0x00007f6c81efabe0 in KIO::ConnectionPrivate::dequeue (this=0xeb04e0) at /home/kde4peter/kde/src/kdelibs/kio/kio/connection.cpp:82
#38 0x00007f6c81efe06b in KIO::Connection::qt_metacall (this=0xea6540, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0x11d6c60) at /home/kde4peter/kde/build/kdelibs/kio/connection.moc:79
#39 0x00007f6c7f45e7aa in QObject::event (this=0xea6540, e=<value optimized out>) at kernel/qobject.cpp:1226
#40 0x00007f6c80104264 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#41 0x00007f6c8010c81a in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#42 0x00007f6c80e6dde9 in KApplication::notify (this=0x7fff2d40ade0, receiver=0xea6540, event=0x17e6770) at /home/kde4peter/kde/src/kdelibs/kdeui/kernel/kapplication.cpp:311
#43 0x00007f6c7f44a7cc in QCoreApplication::notifyInternal (this=0x7fff2d40ade0, receiver=0xea6540, event=0x17e6770) at kernel/qcoreapplication.cpp:787
#44 0x00007f6c7f44dfc5 in sendEvent (receiver=0x0, event_type=0, data=0x60e1a0) at kernel/qcoreapplication.h:215
#45 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x60e1a0) at kernel/qcoreapplication.cpp:1428
#46 0x00007f6c7f475443 in sendPostedEvents (s=<value optimized out>) at kernel/qcoreapplication.h:220
#47 postEventSourceDispatch (s=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:277
#48 0x00007f6c7a4e6bd3 in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#49 0x00007f6c7a4e73b0 in ?? () from /lib64/libglib-2.0.so.0
#50 0x00007f6c7a4e7650 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#51 0x00007f6c7f4755df in QEventDispatcherGlib::processEvents (this=0x60d9b0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#52 0x00007f6c801aa1ae in ?? () from /usr/lib64/libQtGui.so.4
#53 0x00007f6c7f449c22 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#54 0x00007f6c7f449e35 in QEventLoop::exec (this=0x7fff2d40ad50, flags=...) at kernel/qeventloop.cpp:201
#55 0x00007f6c7f44e27b in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#56 0x00007f6c835f8d66 in kdemain (argc=1, argv=0x7fff2d40b358) at /home/kde4peter/kde/src/kde-baseapps/dolphin/src/main.cpp:91
#57 0x0000000000400966 in main (argc=1, argv=0x7fff2d40b358) at /home/kde4peter/kde/build/kde-baseapps/dolphin/src/dolphin_dummy.cpp:3

*** Bug 290021 has been marked as a duplicate of this bug. ***

Git commit 89b45001d2ad058214b7e5b755e48d2791c3d20d by Peter Penz.
Committed on 30/12/2011 at 00:02.
Pushed by ppenz into branch 'KDE/4.8'.

Fix inconsistency in selection manager

When a selection has been done with non-linear ranges, it was possible that
the anchor item pointed to an invalid index that resulted into an invalid
selection.

As part of this fix the sorting for DolphinView::selectedItems() has been
disabled (if the caller assumes a sorted selection he must manually adjust it).
FIXED-IN: 4.8.0

M  +31   -48   dolphin/src/kitemviews/kitemlistselectionmanager.cpp
M  +7    -0    dolphin/src/kitemviews/kitemlistselectionmanager.h
M  +1    -4    dolphin/src/views/dolphinview.cpp

http://commits.kde.org/kde-baseapps/89b45001d2ad058214b7e5b755e48d2791c3d20d

Git commit 1a7e1a23a2c762e8b9d9fd7c6344c45058536edd by Peter Penz.
Committed on 30/12/2011 at 00:02.
Pushed by ppenz into branch 'master'.

Fix inconsistency in selection manager

When a selection has been done with non-linear ranges, it was possible that
the anchor item pointed to an invalid index that resulted into an invalid
selection.

As part of this fix the sorting for DolphinView::selectedItems() has been
disabled (if the caller assumes a sorted selection he must manually adjust it).
FIXED-IN: 4.8.0

M  +31   -48   dolphin/src/kitemviews/kitemlistselectionmanager.cpp
M  +7    -0    dolphin/src/kitemviews/kitemlistselectionmanager.h
M  +1    -4    dolphin/src/views/dolphinview.cpp

http://commits.kde.org/kde-baseapps/1a7e1a23a2c762e8b9d9fd7c6344c45058536edd

Created attachment 67382 [details]
New crash information added by DrKonqi

dolphin (1.99) on KDE Platform 4.7.95 (4.8 RC1 (4.7.95) using Qt 4.7.4

- What I was doing when the application crashed:
Deleting multiple Files in Dolphin after filtering for containing a random character string crashed dolphin

-- Backtrace (Reduced):
#7  0xb6e119b6 in KFileItem::isDir (this=0x9198de0) at ../../kio/kio/kfileitem.cpp:1049
#8  0xb7365d90 in DolphinView::statusBarText (this=0x85ee4a0) at ../../../dolphin/src/views/dolphinview.cpp:500
#9  0xb76cba1c in DolphinViewContainer::updateStatusBar (this=0x8578c28) at ../../../dolphin/src/dolphinviewcontainer.cpp:323
#10 0xb76cc783 in DolphinViewContainer::slotFinishedPathLoading (this=0x8578c28) at ../../../dolphin/src/dolphinviewcontainer.cpp:369
#11 0xb76ce1aa in DolphinViewContainer::qt_metacall (this=0x8578c28, _c=QMetaObject::InvokeMetaMethod, _id=<optimized out>, _a=0xbf9274b8) at ./dolphinviewcontainer.moc:137