./python -E -tt -bb ./Lib/test/regrtest.py -l  -uall
[...]
test_subprocess
.
    this bit of output is from a test of stdout in a different process 
...
test test_subprocess failed -- Traceback (most recent call last):
  File "/Users/cartman/Sources/py3k/Lib/test/test_subprocess.py", line 
407, in test_no_leaking
    data = p.communicate("lime")[0]
  File "/Users/cartman/Sources/py3k/Lib/subprocess.py", line 599, in 
communicate
    return self._communicate(input)
  File "/Users/cartman/Sources/py3k/Lib/subprocess.py", line 1086, in 
_communicate
    rlist, wlist, xlist = select.select(read_set, write_set, [])
select.error: (4, 'Interrupted system call')