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I changed the DELAY in the test to be zero.  The test fails,
but it's interesting that it also hangs in
lock_PyThread_acquire_lock (line 63):

Lib/threading.py (195): wait
Lib/threading.py (468): join
Lib/threading.py (564): __exitfunc
Lib/atexit.py (11): _run_exitfuncs

In looking at threadmodule.c I notice that most of the time 
Py_BEGIN_ALLOW_THREADS/Py_END_ALLOW_THREADS is not used
around PyThread_acquire_lock, but it is in
lock_PyThread_acquire_lock.  I'm not sure all of these are safe.

Here's some more detail on the Sun:

test_socketserver
ADDR = ('localhost', 17231)
CLASS = SocketServer.ForkingTCPServer
server created
thread: creating server
server running
thread: serving three times
test client 0
Fatal Python error: Invalid thread state for this thread