Version:           4.1.2 (using KDE 4.1.2)
Compiler:          64bit 
OS:                Linux
Installed from:    Ubuntu Packages

I've marked two directories an deleted them (crtl del) -> Crash:

#5  0x00007fe053605095 in raise () from /lib/libc.so.6
#6  0x00007fe053606af0 in abort () from /lib/libc.so.6
#7  0x00007fe0554b7055 in qt_message_output () from /usr/lib/libQtCore.so.4
#8  0x00007fe0554b719d in qFatal () from /usr/lib/libQtCore.so.4
#9  0x00007fe05639712a in ?? () from /usr/lib/kde4/lib/libkio.so.5
#10 0x00007fe056397f1d in ?? () from /usr/lib/kde4/lib/libkio.so.5
#11 0x00007fe056398908 in ?? () from /usr/lib/kde4/lib/libkio.so.5
#12 0x00007fe0555b48b6 in QMetaObject::activate ()
   from /usr/lib/libQtCore.so.4
#13 0x00007fe0563a4dc2 in KDirWatch::dirty ()
   from /usr/lib/kde4/lib/libkio.so.5
#14 0x00007fe0563a4fe5 in KDirWatch::setDirty ()
   from /usr/lib/kde4/lib/libkio.so.5
#15 0x00007fe0563a60ff in ?? () from /usr/lib/kde4/lib/libkio.so.5
#16 0x00007fe0563a8340 in ?? () from /usr/lib/kde4/lib/libkio.so.5
#17 0x00007fe0563a942a in ?? () from /usr/lib/kde4/lib/libkio.so.5
#18 0x00007fe0555b48b6 in QMetaObject::activate ()
   from /usr/lib/libQtCore.so.4
#19 0x00007fe0555af1d5 in QObject::event () from /usr/lib/libQtCore.so.4
#20 0x00007fe05433eacf in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#21 0x00007fe054340c85 in QApplication::notify () from /usr/lib/libQtGui.so.4
#22 0x00007fe055eb71f1 in KApplication::notify ()
   from /usr/lib/kde4/lib/libkdeui.so.5
#23 0x00007fe0555a06b9 in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#24 0x00007fe0555cba0c in ?? () from /usr/lib/libQtCore.so.4
#25 0x00007fe0555c957d in ?? () from /usr/lib/libQtCore.so.4
#26 0x00007fe050690364 in g_main_context_dispatch ()
   from /usr/lib/libglib-2.0.so.0
#27 0x00007fe050693675 in ?? () from /usr/lib/libglib-2.0.so.0
#28 0x00007fe050693b5b in g_main_context_iteration ()
   from /usr/lib/libglib-2.0.so.0
#29 0x00007fe0555c99df in QEventDispatcherGlib::processEvents ()
   from /usr/lib/libQtCore.so.4
#30 0x00007fe0543c820f in ?? () from /usr/lib/libQtGui.so.4
#31 0x00007fe05559fb35 in QEventLoop::processEvents ()
   from /usr/lib/libQtCore.so.4
#32 0x00007fe05559fc8b in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#33 0x00007fe0555a1cd9 in QCoreApplication::exec ()
   from /usr/lib/libQtCore.so.4
#34 0x000000000043c09e in ?? ()
#35 0x00007fe0535f11c4 in __libc_start_main () from /lib/libc.so.6
#36 0x0000000000420889 in _start ()
#0  0x00007fe053670b50 in nanosleep () from /lib/libc.so.6