Version:           2.1 (using KDE 3.5.6, Kubuntu (feisty) 4:3.5.6-0ubuntu14.1)
Compiler:          Target: i486-linux-gnu
OS:                Linux (i686) release 2.6.20-16-generic

ktorrent crashes in any circumstances: with or without torrent downloading or uploading. I can't find any regularity with these crashes.
Here is the report:

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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 -1235380528 (LWP 11171)]
[New Thread -1251386480 (LWP 11184)]
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[KCrash handler]
#6  0xb7e34bcb in dht::ParseRsp () from /usr/lib/libktorrent-2.1.so
#7  0xb7e34df2 in dht::MakeRPCMsg () from /usr/lib/libktorrent-2.1.so
#8  0xb7e29f51 in dht::RPCServer::readPacket ()
   from /usr/lib/libktorrent-2.1.so
#9  0xb7e2a252 in dht::RPCServer::qt_invoke ()
   from /usr/lib/libktorrent-2.1.so
#10 0xb6e6e88b in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#11 0xb6e6f330 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#12 0xb75f802c in KNetwork::KClientSocketBase::readyRead ()
   from /usr/lib/libkdecore.so.4
#13 0xb75f8066 in KNetwork::KClientSocketBase::slotReadActivity ()
   from /usr/lib/libkdecore.so.4
#14 0xb760a123 in KNetwork::KClientSocketBase::qt_invoke ()
   from /usr/lib/libkdecore.so.4
#15 0xb760a1c6 in KNetwork::KDatagramSocket::qt_invoke ()
   from /usr/lib/libkdecore.so.4
#16 0xb6e6e88b in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#17 0xb6e6f1a2 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#18 0xb71fb543 in QSocketNotifier::activated () from /usr/lib/libqt-mt.so.3
#19 0xb6e9144a in QSocketNotifier::event () from /usr/lib/libqt-mt.so.3
#20 0xb6e05a60 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#21 0xb6e0788f in QApplication::notify () from /usr/lib/libqt-mt.so.3
#22 0xb75c9cc2 in KApplication::notify () from /usr/lib/libkdecore.so.4
#23 0xb6d981e9 in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3
#24 0xb6df7e59 in QEventLoop::activateSocketNotifiers ()
   from /usr/lib/libqt-mt.so.3
#25 0xb6dacd07 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#26 0xb6e20136 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#27 0xb6e1ff46 in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#28 0xb6e07609 in QApplication::exec () from /usr/lib/libqt-mt.so.3
#29 0x080653d6 in ?? ()
#30 0xb661febc in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#31 0x08064ec1 in ?? ()

Thanks for help