Version:            (using KDE KDE 3.4.0)
Installed from:    Mandriva RPMs
Compiler:           latest release of mandriva 2005 LE from DVD with all available patches and updates
OS:                Linux

Most likely way to reproduce crash invlolves hotplugging a USB2 card reader, opening "System" desktop icon, and clicking on the removable USB device icon. Will crash at least 30% of tries. Occasionally, maybe 5% of time, crash will occur on clicking on "System" desktop icon.
P4 2.8GHz Intel D865PERL mb, Matrox G550, Benq FP767 @1280x1024

BACKTRACE:
Using host libthread_db library "/lib/tls/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1230104896 (LWP 17046)]
[KCrash handler]
#7  0xb79210a6 in QGList::first () from /usr/lib/qt3/lib/libqt-mt.so.3
#8  0xb7e7838d in QPtrList<KDirLister>::first (this=0x0) at qptrlist.h:109
#9  0xb7e70883 in KDirListerCache::slotUpdateResult (this=0x82ae6b8, 
    j=0x82ae74c) at kdirlister.cpp:1477
#10 0xb7e71730 in KDirListerCache::qt_invoke (this=0x82ae6b8, _id=10, 
    _o=0xbfffd230) at kdirlister_p.moc:135
#11 0xb76496c8 in QObject::activate_signal ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#12 0xb7dfa401 in QPtrList<KIO::Slave>::count (this=0x0) at qptrlist.h:77