I am currently running ktorrent-11-11-06. I find that it is constantly crashing with a segfault. Have done a backtrace but can't see any way to attach it to this post, so please excuse me dumping it in here directly.

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Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1234458944 (LWP 6373)]
[New Thread -1240044624 (LWP 6388)]
[KCrash handler]
#6 0xb71b487d in QMutex::lock () from /usr/lib/libqt-mt.so.3
#7 0xb7e4de77 in bt::PacketReader::update () from /usr/lib/libktorrent.so.0
#8 0xb7e2d9cb in bt::Peer::update () from /usr/lib/libktorrent.so.0
#9 0xb7e32371 in bt::PeerManager::update () from /usr/lib/libktorrent.so.0
#10 0xb7e40138 in bt::TorrentControl::update () from /usr/lib/libktorrent.so.0
#11 0x080774cb in KTorrentCore::update ()
#12 0x0807cc1d in KTorrentCore::qt_invoke ()
#13 0xb6ed3051 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#14 0xb6ed3aec in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#15 0xb7268536 in QTimer::timeout () from /usr/lib/libqt-mt.so.3
#16 0xb6ef8049 in QTimer::event () from /usr/lib/libqt-mt.so.3
#17 0xb6e68f3e in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#18 0xb6e6913a in QApplication::notify () from /usr/lib/libqt-mt.so.3
#19 0xb76131cd in KApplication::notify () from /usr/lib/libkdecore.so.4
#20 0xb6dfa157 in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3
#21 0xb6e5a92b in QEventLoop::activateTimers () from /usr/lib/libqt-mt.so.3
#22 0xb6e0df67 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#23 0xb6e81a2f in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#24 0xb6e81952 in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#25 0xb6e67a4d in QApplication::exec () from /usr/lib/libqt-mt.so.3
#26 0x08063738 in main ()
===============================

I am not sure what I'm looking at, so any advice would be most welcome

I would also like to comment that other then this little difficulty, this version of kTorrent is fantastic.

Strange, we haven't seen that before. Can you recompile with debug info (./configure --enable-debug=full) ? That should give some more information about the crash.

Ok, recompiled kTorrent 11-11-06 recompile with debug info (./configure --enable-debug=full) and let it run. The following was the result of the backtrace.

====================================

Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1234880832 (LWP 13010)]
[New Thread -1243219024 (LWP 13032)]
[KCrash handler]
#6 0xffffe410 in __kernel_vsyscall ()
#7 0xb66a59a1 in raise () from /lib/tls/i686/cmov/libc.so.6
#8 0xb66a72b9 in abort () from /lib/tls/i686/cmov/libc.so.6
#9 0xb6883c84 in __gnu_cxx::__verbose_terminate_handler ()
from /usr/lib/libstdc++.so.6
#10 0xb6881915 in __gxx_personality_v0 () from /usr/lib/libstdc++.so.6
#11 0xb688194a in std::terminate () from /usr/lib/libstdc++.so.6
#12 0xb6881a7e in __cxa_throw () from /usr/lib/libstdc++.so.6
#13 0xb6881e81 in operator new () from /usr/lib/libstdc++.so.6
#14 0xb6881f3d in operator new[] () from /usr/lib/libstdc++.so.6
#15 0xb7deb9ab in mse::StreamSocket::reinsert (this=0x87e80b0,
d=0x3326ebc6 <Address 0x3326ebc6 out of bounds>, size=1299471632)
at streamsocket.cpp:248
#16 0xb7dece0d in mse::EncryptedAuthenticate::handlePadD (this=0x8803728)
at encryptedauthenticate.cpp:233
#17 0xb7deda27 in mse::EncryptedAuthenticate::onReadyRead (this=0x8803728)
at encryptedauthenticate.cpp:283
#18 0xb7e69cfa in bt::AuthenticationMonitor::update (this=0x80ec2b0)
at authenticationmonitor.cpp:122
#19 0x08083262 in KTorrentCore::update (this=0x83b86b0)
at ktorrentcore.cpp:537
#20 0x08084915 in KTorrentCore::qt_invoke (this=0x83b86b0, _id=5,
_o=0xbf8ec09c) at ktorrentcore.moc:243
#21 0xb6e6c051 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#22 0xb6e6caec in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#23 0xb7201536 in QTimer::timeout () from /usr/lib/libqt-mt.so.3
#24 0xb6e91049 in QTimer::event () from /usr/lib/libqt-mt.so.3
#25 0xb6e01f3e in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#26 0xb6e0213a in QApplication::notify () from /usr/lib/libqt-mt.so.3
#27 0xb75ac1cd in KApplication::notify () from /usr/lib/libkdecore.so.4
#28 0xb6d93157 in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3
#29 0xb6df392b in QEventLoop::activateTimers () from /usr/lib/libqt-mt.so.3
#30 0xb6da6f67 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#31 0xb6e1aa2f in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#32 0xb6e1a952 in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#33 0xb6e00a4d in QApplication::exec () from /usr/lib/libqt-mt.so.3
#34 0x08066320 in main (argc=7, argv=0xbf8ec854) at main.cpp:118

====================================

Hope that helps a tad more. If I can do anything else to help let me know.

I made a commit last night which should prevent this situation.

Sounds great. Will wait for the next available snapshot and test. Thanks again for all your work!