Francis Bolduc added the comment:

This problem also happens simply by calling sys.exit from one of the child 
processes.

The following script exhibits the problem:

import multiprocessing
import sys
def test(value):
    if value:
        sys.exit(123)
if __name__ == '__main__':
    pool = multiprocessing.Pool(4)
    cases = [0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0]
    pool.map(test, cases)

----------
nosy: +Francis Bolduc

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue22393>
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