Version:           2.1 (using KDE 3.5.6, Kubuntu (feisty) 4:3.5.6-0ubuntu14)
Compiler:          Target: i486-linux-gnu
OS:                Linux (i686) release 2.6.20-16-generic

Hi 
Ktorrent crach all the time...
It's run 1 or 2 hours and it open a window with a bomb picture saying: "Ktorrent didn't finish properly and generate the signal 11 (SIGSEGV)" (roughly... :-D  )
I have cut/paste this:
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Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
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[Thread debugging using libthread_db enabled]
[New Thread -1235179824 (LWP 6616)]
[New Thread -1251529840 (LWP 7432)]
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[KCrash handler]
#6  0xb7e65bcb in dht::ParseRsp () from /usr/lib/libktorrent-2.1.so
#7  0xb7e65df2 in dht::MakeRPCMsg () from /usr/lib/libktorrent-2.1.so
#8  0xb7e5af51 in dht::RPCServer::readPacket ()
   from /usr/lib/libktorrent-2.1.so
#9  0xb7e5b252 in dht::RPCServer::qt_invoke ()
   from /usr/lib/libktorrent-2.1.so
#10 0xb6e9f88b in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#11 0xb6ea0330 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#12 0xb762904c in KNetwork::KClientSocketBase::readyRead ()
   from /usr/lib/libkdecore.so.4
#13 0xb7629086 in KNetwork::KClientSocketBase::slotReadActivity ()
   from /usr/lib/libkdecore.so.4
#14 0xb763b143 in KNetwork::KClientSocketBase::qt_invoke ()
   from /usr/lib/libkdecore.so.4
#15 0xb763b1e6 in KNetwork::KDatagramSocket::qt_invoke ()
   from /usr/lib/libkdecore.so.4
#16 0xb6e9f88b in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#17 0xb6ea01a2 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#18 0xb722c877 in QSocketNotifier::activated () from /usr/lib/libqt-mt.so.3
#19 0xb6ec244a in QSocketNotifier::event () from /usr/lib/libqt-mt.so.3
#20 0xb6e36a60 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#21 0xb6e3888f in QApplication::notify () from /usr/lib/libqt-mt.so.3
#22 0xb75face2 in KApplication::notify () from /usr/lib/libkdecore.so.4
#23 0xb6dc91e9 in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3
#24 0xb6e28e59 in QEventLoop::activateSocketNotifiers ()
   from /usr/lib/libqt-mt.so.3
#25 0xb6dddd07 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#26 0xb6e51136 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#27 0xb6e50f46 in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#28 0xb6e38609 in QApplication::exec () from /usr/lib/libqt-mt.so.3
#29 0x080653d6 in ?? ()
#30 0xb6650ebc in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#31 0x08064ec1 in ?? ()

Goodbye and think you for your job...