This seems to be only partially fixed.  With rev 74123, when I run it with
a moderate depth and a large iteration count (arguments 100 100000 or even
5000 100000) it runs fine and does not find any name mismatches in the
exception trace.  

But when I run it with a depth >= 7166 and iteration count
of 1 (e.g., arguments 8000 1), it crashes with a seg fault.  I have
stack size set to "unlimited" and I verified that the stack for each thread
is only about 1 MB.  These results are on OpenSolaris 2008.05 snv_93 on x86.
Haven't tried on Solaris SPARC yet.

In fact, it crashes with just one main thread and one worker if depth >= 7166,
even if it does not raise an exception. Maybe there is a per-thread stack
limit I'm not aware of.  I will try on Solaris SPARC.