Application: dolphin (1.99)
KDE Platform Version: 4.7.3 (4.7.3) (Compiled from sources)
Qt Version: 4.7.4
Operating System: Linux 3.1-CHAKRA x86_64
Distribution: "Chakra Linux"

-- Information about the crash:
In Dolphin, using shortcut key Alt+. to display my all hided folders in my /home/user/ and hide them again like three times, the Dolphin will be crash.

The crash can be reproduced every time.

-- Backtrace:
Application: Dolphin (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0x7fa0dd053760 (LWP 2878))]

Thread 2 (Thread 0x7fa0c4407700 (LWP 2881)):
#0  0x00007fa0da6ee123 in poll () from /lib/libc.so.6
#1  0x00007fa0d7734c14 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007fa0d773514d in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007fa0dbcb8f7e in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#4  0x00007fa0dbc8d4f2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#5  0x00007fa0dbc8d6f7 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#6  0x00007fa0dbba502f in QThread::exec() () from /usr/lib/libQtCore.so.4
#7  0x00007fa0dbc7052f in ?? () from /usr/lib/libQtCore.so.4
#8  0x00007fa0dbba7a85 in ?? () from /usr/lib/libQtCore.so.4
#9  0x00007fa0db91ddf0 in start_thread () from /lib/libpthread.so.0
#10 0x00007fa0da6f639d in clone () from /lib/libc.so.6
#11 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fa0dd053760 (LWP 2878)):
[KCrash Handler]
#6  0x00007fa0d4d75f51 in KFileItem::determineMimeType() const () from /usr/lib/libkio.so.5
#7  0x00007fa0c97b0377 in KFileItemModelRolesUpdater::startPreviewJob(KFileItemList const&) () from /usr/lib/libdolphinprivate.so.4
#8  0x00007fa0c97b2283 in KFileItemModelRolesUpdater::resolvePendingRoles() () from /usr/lib/libdolphinprivate.so.4
#9  0x00007fa0c97b2ebc in KFileItemModelRolesUpdater::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libdolphinprivate.so.4
#10 0x00007fa0dbca0f0a in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#11 0x00007fa0dbca47d9 in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#12 0x00007fa0dae6dd94 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#13 0x00007fa0dae72c01 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#14 0x00007fa0dca47e26 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#15 0x00007fa0dbc8e2fc in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#16 0x00007fa0dbcbada2 in ?? () from /usr/lib/libQtCore.so.4
#17 0x00007fa0dbcb8554 in ?? () from /usr/lib/libQtCore.so.4
#18 0x00007fa0d77346d3 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#19 0x00007fa0d7734eb0 in ?? () from /usr/lib/libglib-2.0.so.0
#20 0x00007fa0d773514d in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#21 0x00007fa0dbcb8f16 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#22 0x00007fa0daf10cae in ?? () from /usr/lib/libQtGui.so.4
#23 0x00007fa0dbc8d4f2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#24 0x00007fa0dbc8d6f7 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#25 0x00007fa0dbc918eb in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#26 0x00007fa0c9f45a5d in kdemain () from /usr/lib/libkdeinit4_dolphin.so
#27 0x0000000000408792 in _start ()

Reported using DrKonqi