Version:           3.1.1 (using KDE 3.1.1)
Installed from:    compiled sources
Compiler:          gcc version 2.96 20000731 (Red Hat Linux 7.3 2.96-113)
OS:          Linux (i686) release 2.4.20

Just playing with a rar archive: clicked in, clicked out and konqui crashed. There isn't really much more to say.
Here is the backtrace I copied after crash:

[New Thread 1024 (LWP 1966)]
0x40ea54d9 in wait4 () from /lib/libc.so.6
#0  0x40ea54d9 in wait4 () from /lib/libc.so.6
#1  0x40f1d30c in __DTOR_END__ () from /lib/libc.so.6
#2  0x40d6483a in waitpid () from /lib/libpthread.so.0
#3  0x405418d4 in KCrash::defaultCrashHandler ()
   from /usr/local/kde-3.1.1/lib/libkdecore.so.4
#4  0x40d62307 in pthread_sighandler () from /lib/libpthread.so.0
#5  <signal handler called>
#6  0x40ab5513 in QString::operator+= () from /usr/local/qt/lib/libqt-mt.so.3
#7  0x41dc75a2 in Arch::slotReceivedTOC ()
   from /usr/local/kde-3.1.1/lib/libarkpart.so
#8  0x41dc8fc0 in Arch::qt_invoke ()
   from /usr/local/kde-3.1.1/lib/libarkpart.so
#9  0x41dd210d in RarArch::qt_invoke ()
   from /usr/local/kde-3.1.1/lib/libarkpart.so
#10 0x408a01ae in QObject::activate_signal ()
   from /usr/local/qt/lib/libqt-mt.so.3
#11 0x4050f7a5 in KProcess::receivedStdout ()
   from /usr/local/kde-3.1.1/lib/libkdecore.so.4
#12 0x4050e849 in KProcess::childOutput ()
   from /usr/local/kde-3.1.1/lib/libkdecore.so.4
#13 0x4050e6c0 in KProcess::slotChildOutput ()
   from /usr/local/kde-3.1.1/lib/libkdecore.so.4
#14 0x4050fa6c in KProcess::qt_invoke ()
   from /usr/local/kde-3.1.1/lib/libkdecore.so.4
#15 0x408a01ae in QObject::activate_signal ()
   from /usr/local/qt/lib/libqt-mt.so.3
#16 0x408a0317 in QObject::activate_signal ()
   from /usr/local/qt/lib/libqt-mt.so.3
#17 0x40b09087 in QSocketNotifier::activated ()
   from /usr/local/qt/lib/libqt-mt.so.3
#18 0x408b6852 in QSocketNotifier::event ()
   from /usr/local/qt/lib/libqt-mt.so.3
#19 0x4085020c in QApplication::internalNotify ()
   from /usr/local/qt/lib/libqt-mt.so.3
#20 0x40850013 in QApplication::notify () from /usr/local/qt/lib/libqt-mt.so.3
#21 0x404dff7e in KApplication::notify ()
   from /usr/local/kde-3.1.1/lib/libkdecore.so.4
#22 0x40832768 in QEventLoop::activateSocketNotifiers ()
   from /usr/local/qt/lib/libqt-mt.so.3
#23 0x408158cc in QEventLoop::processEvents ()
   from /usr/local/qt/lib/libqt-mt.so.3
#24 0x40860164 in QEventLoop::enterLoop () from /usr/local/qt/lib/libqt-mt.so.3
#25 0x408600b9 in QEventLoop::exec () from /usr/local/qt/lib/libqt-mt.so.3
#26 0x40850362 in QApplication::exec () from /usr/local/qt/lib/libqt-mt.so.3
#27 0x4151e646 in main () from /usr/local/kde-3.1.1/lib/konqueror.so
#28 0x0804c908 in launch ()
#29 0x0804d5a3 in handle_launcher_request ()
#30 0x0804d9b6 in handle_requests ()
#31 0x0804e86a in main ()
#32 0x40e121c4 in __libc_start_main () from /lib/libc.so.6