#!/usr/bin/env python
# -*- coding: utf-8 -*-

from subprocess import *
from threading import *

THREAD_COUNT=50

def worker():
    p = Popen(["cat"], stdin=PIPE, stdout=PIPE, stderr=STDOUT)
    out = p.communicate("hoge")[0]
    print "%s %s" % (current_thread().name, out)

threads = []
for i in range(THREAD_COUNT):
    worker()

Disallowed system call: SYS_pipe