Ktorrent crashes if TTPTracker::doRequest is invoked and previous
query to the tracker is not completed yet.
The crash is somewhere in kde code - KIO::Job.
It is result from execution of j->kill(); from function HTTPTracker::onResult

How to reproduce:
If the tracker doesn't respond the timeout period is about 20 seconds.
If during this time you perform manual announse or stop torrent, KT crashes.

SVN revision 481339.

In deed, it's fixed, will commit in a short while.