Application that crashed: dolphin
Version of the application: 1.3
KDE Version: 4.3.00 (KDE 4.3.0)
Qt Version: 4.5.2
Operating System: Linux 2.6.30-1-amd64 x86_64
Distribution: Debian GNU/Linux testing (squeeze)

What I was doing when the application crashed:
I copied more than seven directories with nearly 3gb data from hard disk to usb stick, dolphin crashed while i changed to destination window. before that whole kde system (konsole was fine) behaved very slowly. 

 -- Backtrace:
Application: Dolphin (dolphin), signal: Segmentation fault
[KCrash Handler]
#5  KIO::Slave::deref (this=0x1772e20) at ../../kio/kio/slave.cpp:242
#6  0x00007f574ebad4ba in KIO::Slave::gotInput (this=0x1772e20) at ../../kio/kio/slave.cpp:335
#7  0x00007f574ebaf7d8 in KIO::Slave::qt_metacall (this=0x1772e20, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0x7fff0747b560) at ./slave.moc:76
#8  0x00007f574ba5c602 in QMetaObject::activate (sender=0x19105a0, from_signal_index=<value optimized out>, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3112
#9  0x00007f574eaca381 in KIO::ConnectionPrivate::dequeue (this=0x195d970) at ../../kio/kio/connection.cpp:82
#10 0x00007f574eaca7da in KIO::Connection::qt_metacall (this=0x19105a0, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0x178c2c0) at ./connection.moc:73
#11 0x00007f574ba56ee8 in QObject::event (this=0x19105a0, e=0x1918820) at kernel/qobject.cpp:1110
#12 0x00007f574bf147ad in QApplicationPrivate::notify_helper (this=0x1170860, receiver=0x19105a0, e=0x1918820) at kernel/qapplication.cpp:4056
#13 0x00007f574bf1c80a in QApplication::notify (this=0x7fff0747bfb0, receiver=0x19105a0, e=0x1918820) at kernel/qapplication.cpp:4021
#14 0x00007f574d264b2b in KApplication::notify (this=0x7fff0747bfb0, receiver=0x19105a0, event=0x1918820) at ../../kdeui/kernel/kapplication.cpp:302
#15 0x00007f574ba4749c in QCoreApplication::notifyInternal (this=0x7fff0747bfb0, receiver=0x19105a0, event=0x1918820) at kernel/qcoreapplication.cpp:610
#16 0x00007f574ba480e4 in QCoreApplication::sendEvent (receiver=0x0, event_type=0, data=0x114af80) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#17 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x114af80) at kernel/qcoreapplication.cpp:1247
#18 0x00007f574ba6fef3 in QCoreApplication::sendPostedEvents (s=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218
#19 postEventSourceDispatch (s=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:210
#20 0x00007f574799a7aa in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#21 0x00007f574799ddf8 in ?? () from /usr/lib/libglib-2.0.so.0
#22 0x00007f574799dfac in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#23 0x00007f574ba6fb7f in QEventDispatcherGlib::processEvents (this=0x114a790, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#24 0x00007f574bfab5ef in QGuiEventDispatcherGlib::processEvents (this=0x20, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#25 0x00007f574ba45d62 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#26 0x00007f574ba46134 in QEventLoop::exec (this=0x7fff0747bf20, flags=...) at kernel/qeventloop.cpp:201
#27 0x00007f574ba483a4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#28 0x000000000043946d in main (argc=3, argv=0x7fff0747c498) at ../../../../apps/dolphin/src/main.cpp:94

Reported using DrKonqi