jython 2.7b2+ ends up with exhausting all file descriptors (ulimit=1024)

gistfile1.txt

>>> import subprocess
>>> def ping(addr):
...     cmd1 = '/bin/ping -c2 {addr}'.format(addr=addr)
...     try:
...         output = subprocess.check_output(cmd1.split(' '))
...     except subprocess.CalledProcessError:
...         retval = False
...         min = 0
...     else:
...         head, _, rest = output.partition('mdev =')
...         min, avg, max, mdev = rest[:-4].split('/')
...         received = head.partition('packets transmitted,')[2][:2]
...         retval = True if int(received) > 0 else False
...     return (retval, float(min))
... 
>>> a1='8.8.8.8'
>>> lst=[]
>>> for i in range(1024):
...  lst.append( ping(a1) )