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stubbing out subprocess._cleanup does not work around the problem from this example on 2.6.5:
import subprocess, signal
subprocess._cleanup = lambda: None
signal.signal(signal.SIGCLD, signal.SIG_IGN)
subprocess.Popen(['echo','foo']).wait()
james@hyla:~$ python tt.py
foo
Traceback (most recent call last):
 File "tt.py", line 5, in <module>
 subprocess.Popen(['echo','foo']).wait()
 File "/usr/lib/python2.6/subprocess.py", line 1170, in wait
 pid, sts = _eintr_retry_call(os.waitpid, self.pid, 0)
 File "/usr/lib/python2.6/subprocess.py", line 465, in _eintr_retry_call
 return func(*args)
OSError: [Errno 10] No child processes
This bug still prevents subprocess from being used inside of a daemon where SIGCLD is being caught to reap zombie processes.