Python multiprocessing continuously spawns pythonw.exe processes without doing any actual work

I don't understand why this simple code

# file: mp.py
from multiprocessing import Process
import sys

def func(x):
    print 'works ', x + 2
    sys.stdout.flush()

p = Process(target= func, args= (2, ))
p.start()
p.join()
p.terminate()
print 'done'
sys.stdout.flush()

creates "pythonw.exe" processes continuously and it doesn't print anything, even though I run it from the command line:

python mp.py

I am running the latest of Python 2.6 on Windows 7 both 32 and 64 bits