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It looks to me as if this issue has already been pretty much sorted out already. Maybe all it lacks is to be officially closed, but just in case I just wanted to add that I too saw this bug (stock python 2.7, Ubuntu 10.04 64 bit).
My example code was:
#!/usr/bin/env python
import multiprocessing
import os
import time
def f(i):
 print "I am process number",os.getpid(),": i =",i
 time.sleep(10)
 return i*i
pool = multiprocessing.Pool(maxtasksperchild=1)
print pool.map(f, range(10))