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Experimenting a bit, I found out that using asynchat.py from Python 2.3.3 in an otherwise CVS HEAD Python solves the problem.  The problem was introduced in this file in revision 1.22 by Raymond: "Use collection.deque() instead of a list for a FIFO queue."  <Insert random rambling against this kind of optimizations here>  The problem is at line 261:  "return self.list == []"  which is a correct way to check if a list is empty, but not if a deque is empty!

Fix checked in as asynchat.py:1.25.

The same bug doesn't seem to be present anywhere else.

A few usages of deques in the standard library seem unjustified: in shlex.py, items are only added or removed at the left.