Version:           ktorrent 2.0.2 (using KDE KDE 3.5.4)
Installed from:    Slackware Packages
Compiler:          GCC-3.4.6 
OS:                Linux

Having enabled DHT in ktorrent and having several torrents downloading, quite often I get SIGSEGV and the app crashes. Below is a backtrace generated after the crash. 

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Using host libthread_db library "/lib/tls/libthread_db.so.1".
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[Thread debugging using libthread_db enabled]
[New Thread -1233279296 (LWP 7821)]
[New Thread -1243685968 (LWP 18821)]
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[KCrash handler]
#5  0xb7f81310 in dht::ParseRsp () from /opt/kde/lib/libktorrent.so.0
#6  0xb7f814c8 in dht::MakeRPCMsg () from /opt/kde/lib/libktorrent.so.0
#7  0xb7f7533f in dht::RPCServer::readPacket ()
   from /opt/kde/lib/libktorrent.so.0
#8  0xb7f755e8 in dht::RPCServer::qt_invoke ()
   from /opt/kde/lib/libktorrent.so.0
#9  0xb700c004 in QObject::activate_signal ()
   from /usr/lib/qt/lib/libqt-mt.so.3
#10 0xb700c79c in QObject::activate_signal ()
   from /usr/lib/qt/lib/libqt-mt.so.3
#11 0xb7745d0c in KNetwork::KClientSocketBase::readyRead ()
   from /opt/kde/lib/libkdecore.so.4
#12 0xb7745d4a in KNetwork::KClientSocketBase::slotReadActivity ()
   from /opt/kde/lib/libkdecore.so.4
#13 0xb7746adf in KNetwork::KClientSocketBase::qt_invoke ()
   from /opt/kde/lib/libkdecore.so.4
#14 0xb774ac04 in KNetwork::KDatagramSocket::qt_invoke ()
   from /opt/kde/lib/libkdecore.so.4
#15 0xb700c004 in QObject::activate_signal ()
   from /usr/lib/qt/lib/libqt-mt.so.3
#16 0xb700c62b in QObject::activate_signal ()
   from /usr/lib/qt/lib/libqt-mt.so.3
#17 0xb734c990 in QSocketNotifier::activated ()
   from /usr/lib/qt/lib/libqt-mt.so.3
#18 0xb7029070 in QSocketNotifier::event () from /usr/lib/qt/lib/libqt-mt.so.3
#19 0xb6fa746f in QApplication::internalNotify ()
   from /usr/lib/qt/lib/libqt-mt.so.3
#20 0xb6fa760c in QApplication::notify () from /usr/lib/qt/lib/libqt-mt.so.3
#21 0xb75f2ac5 in KApplication::notify () from /opt/kde/lib/libkdecore.so.4
#22 0xb6f9ab33 in QEventLoop::activateSocketNotifiers ()
   from /usr/lib/qt/lib/libqt-mt.so.3
#23 0xb6f53481 in QEventLoop::processEvents ()
   from /usr/lib/qt/lib/libqt-mt.so.3
#24 0xb6fbdb91 in QEventLoop::enterLoop () from /usr/lib/qt/lib/libqt-mt.so.3
#25 0xb6fbdae6 in QEventLoop::exec () from /usr/lib/qt/lib/libqt-mt.so.3
#26 0xb6fa65cf in QApplication::exec () from /usr/lib/qt/lib/libqt-mt.so.3
#27 0x0805e602 in ?? ()
#28 0xb684ee14 in __libc_start_main () from /lib/tls/libc.so.6
#29 0x0805e1f1 in ?? ()