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For what it's worth, I think I have a simpler reproducer of this issue. Using freshly-compiled python-from-trunk (as well as multiprocessing-from-trunk), I get tracebacks from the following about 30% of the time:
"""
import multiprocessing, time 
def foo(x): 
 time.sleep(3) 
multiprocessing.Pool(1).apply(foo, [1])
"""
My tracebacks are of the form:
"""
Exception in thread Thread-1 (most likely raised during interpreter shutdown):
Traceback (most recent call last):
 File "/usr/local/lib/python2.7/threading.py", line 530, in __bootstrap_inner
 File "/usr/local/lib/python2.7/threading.py", line 483, in run
 File "/usr/local/lib/python2.7/multiprocessing/pool.py", line 272, in _handle_workers
<type 'exceptions.TypeError'>: 'NoneType' object is not callable
"""