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Well, the superficial fix doesn't work (sorry for posting
too soon).  It turns out that PyTrace_EXCEPTION is sent for
any exception, not just one causing the function to exit. 
So I guess the best fix may be to have hotshot always
install its profiler_callback to handle CALLS and RETURNS,
and then optionally install the tracer_callback to handle
only LINEs.  Anyway, that works for the one test case I've
been using (a runcall of a function which simply does
"import pickle").

By the way, I'm testing with 2.4b1.