Version:           3.4.0-5 (using KDE KDE 3.4.0)
Installed from:    Fedora RPMs
Compiler:          gcc version 4.0.0 20050519 (Red Hat 4.0.0-8) 
OS:                Linux

The crash is reproduced 10% of the time (approx)
might not be worth investigation. up to you to see.

for example

-browsing a remote SMB share like C$
-asks for password and login as the default does not have access
-fill a pass or not 
-crashes
-sometimes it does not even asks for login but just crashes

The trace is below:
(no debugging symbols found)
Using host libthread_db library "/lib/libthread_db.so.1".
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[Thread debugging using libthread_db enabled]
[New Thread -1208404288 (LWP 6051)]
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[KCrash handler]
#4  0x03a726c6 in QGList::first () from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#5  0x043570f6 in KDirListerCache::slotUpdateResult ()
   from /usr/lib/libkio.so.4
#6  0x0435afc1 in KDirListerCache::qt_invoke () from /usr/lib/libkio.so.4
#7  0x03786db4 in QObject::activate_signal ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#8  0x0429ac32 in KIO::Job::result () from /usr/lib/libkio.so.4
#9  0x0429fbb3 in KIO::Job::emitResult () from /usr/lib/libkio.so.4
#10 0x042a61e8 in KIO::SimpleJob::slotFinished () from /usr/lib/libkio.so.4
#11 0x042ad623 in KIO::ListJob::slotFinished () from /usr/lib/libkio.so.4
#12 0x042ad545 in KIO::ListJob::qt_invoke () from /usr/lib/libkio.so.4
#13 0x03786db4 in QObject::activate_signal ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#14 0x03787274 in QObject::activate_signal ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#15 0x0428d19e in KIO::SlaveInterface::finished () from /usr/lib/libkio.so.4
#16 0x0428fba8 in KIO::SlaveInterface::dispatch () from /usr/lib/libkio.so.4
#17 0x0428e13d in KIO::SlaveInterface::dispatch () from /usr/lib/libkio.so.4
#18 0x0428b5e0 in KIO::Slave::gotInput () from /usr/lib/libkio.so.4
#19 0x0428b775 in KIO::Slave::qt_invoke () from /usr/lib/libkio.so.4
#20 0x03786db4 in QObject::activate_signal ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#21 0x037873e8 in QObject::activate_signal ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#22 0x03afc496 in QSocketNotifier::activated ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#23 0x037a6a95 in QSocketNotifier::event ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#24 0x0372208d in QApplication::internalNotify ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#25 0x03722a0c in QApplication::notify ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#26 0x0028b661 in KApplication::notify () from /usr/lib/libkdecore.so.4
#27 0x03715ab9 in QEventLoop::activateSocketNotifiers ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#28 0x036cc300 in QEventLoop::processEvents ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#29 0x0373a732 in QEventLoop::enterLoop ()
   from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#30 0x0373a656 in QEventLoop::exec () from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#31 0x03721a59 in QApplication::exec () from /usr/lib/qt-3.3/lib/libqt-mt.so.3
#32 0x00529d0d in kdemain () from /usr/lib/libkdeinit_konqueror.so
#33 0x001396c4 in kdeinitmain () from /usr/lib/kde3/konqueror.so
#34 0x0804de4d in ?? ()
#35 0x0804e4c5 in ?? ()
#36 0x0804eb8e in ?? ()
#37 0x0804fb29 in ?? ()
#38 0x0083fde6 in __libc_start_main () from /lib/libc.so.6
#39 0x0804b911 in ?? ()