para_close_exc.py

import sys

import paramiko

print("paramiko version=%s" % (paramiko.__version__,))
print("python version=%d.%d.%d" % sys.version_info[:3])

if len(sys.argv) != 5:
    print("USAGE: %s ip port user password" % __file__)
    sys.exit(1)

ip = sys.argv[1]
port = sys.argv[2]
usr = sys.argv[3]
passwd = sys.argv[4]

ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect(hostname=ip, port=port,
            username=usr, password=passwd)

for i in range(2500):
    sys.stdout.write('.')
    if i & 63 == 0:
        sys.stdout.write(" %d\n" % i)
    sys.stdout.flush()

    ret = ssh.exec_command("echo haha")
    _in, _out, _err = ret
    o = _out.read()
    e = _err.read()

    # this line triggers the bug
    del o, e, _in, _out, _err, ret
    # ... or replace by _in.close()

sys.stdout.write("\n")
ssh.close()