Version:           2.1 (using KDE 3.5.6, Kubuntu (feisty) 4:3.5.6-0ubuntu14)
Compiler:          Target: i486-linux-gnu
OS:                Linux (i686) release 2.6.20-15-generic

Without any logic reason the application crashes. aMule, Kopete, Kwallet, Klipper, Korganizer, Kmail and Akregator are others applications actives.
Any time KTorrent restarts correctly but after time I found it crashed.
My laptop has 2Gb RAM and a Intel Core2Duo 1,66Ghz.
This is debug log :

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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 -1235790128 (LWP 30777)]
[New Thread -1327502448 (LWP 30891)]
[New Thread -1319109744 (LWP 30890)]
[New Thread -1261102192 (LWP 30810)]
[New Thread -1250714736 (LWP 30778)]
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[KCrash handler]
#6  0xb7dd0b9b in dht::ParseRsp () from /usr/lib/libktorrent-2.1.so
#7  0xb7dd0dc2 in dht::MakeRPCMsg () from /usr/lib/libktorrent-2.1.so
#8  0xb7dc5f21 in dht::RPCServer::readPacket ()
   from /usr/lib/libktorrent-2.1.so
#9  0xb7dc6222 in dht::RPCServer::qt_invoke ()
   from /usr/lib/libktorrent-2.1.so
#10 0xb6e0a88b in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#11 0xb6e0b330 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#12 0xb759404c in KNetwork::KClientSocketBase::readyRead ()
   from /usr/lib/libkdecore.so.4
#13 0xb7594086 in KNetwork::KClientSocketBase::slotReadActivity ()
   from /usr/lib/libkdecore.so.4
#14 0xb75a6143 in KNetwork::KClientSocketBase::qt_invoke ()
   from /usr/lib/libkdecore.so.4
#15 0xb75a61e6 in KNetwork::KDatagramSocket::qt_invoke ()
   from /usr/lib/libkdecore.so.4
#16 0xb6e0a88b in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#17 0xb6e0b1a2 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#18 0xb7197877 in QSocketNotifier::activated () from /usr/lib/libqt-mt.so.3
#19 0xb6e2d44a in QSocketNotifier::event () from /usr/lib/libqt-mt.so.3
#20 0xb6da1a60 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#21 0xb6da388f in QApplication::notify () from /usr/lib/libqt-mt.so.3
#22 0xb7565ce2 in KApplication::notify () from /usr/lib/libkdecore.so.4
#23 0xb6d341e9 in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3
#24 0xb6d93e59 in QEventLoop::activateSocketNotifiers ()
   from /usr/lib/libqt-mt.so.3
#25 0xb6d48d07 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#26 0xb6dbc136 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#27 0xb6dbbf46 in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#28 0xb6da3609 in QApplication::exec () from /usr/lib/libqt-mt.so.3
#29 0x080653d6 in ?? ()
#30 0xb65bbebc in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#31 0x08064ec1 in ?? ()