import random

from multiprocessing import Pool
from time import sleep

def Process(x):
  try:
    print x
    sleep(random.random())
    raise Exception('Exception: ' + x)
  finally:
    print 'Finally: ' + x

Pool(3).map(Process, ['1','2','3'])

Expect all three Finally blocks to be called (or at least, one Finally per x printed by line 8)

Actually, only one (occasionally two) are printed.

Same behaviour exhibited on dual-core Mac running OSX 10.6 with Python 2.7, and single core Ubuntu running Python 2.6.