execute command using ansible hang

[Yao]

when run a command using ansible:

ansible -vvvv  test -m shell -a "df -h"

Using /etc/ansible/ansible.cfg as config file

Loaded callback minimal of type stdout, v2.0

<test> ESTABLISH SSH CONNECTION FOR USER: root

<test> SSH: EXEC ssh -C -vvv -o ControlMaster=auto -o ControlPersist=60s -o ServerAliveInterval=60 -o Port=37226 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o User=root -o ConnectTimeout=20 -o ControlPath=/root/.ansible/cp/ansible-ssh-%h-%p-%r  test  '/bin/sh -c '"'"'LANG=en_US.UTF-8 LC_ALL=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8 /usr/bin/python && sleep 0'"'"''

then the prcess  seem hang ,  I want it can stop after 30s,

I try using async in playbook

---

- hosts: test

  remote_user: root

  gather_facts: false

  tasks:

  - name: test

    command: df -h

    async: 45

    poll: 0

ansible-playbook -vvv test.yaml 

Using /etc/ansible/ansible.cfg as config file

PLAYBOOK: test.yaml ************************************************************

1 plays in test.yaml

PLAY [test] ***********************************************************

TASK [test] ********************************************************************

task path: /opt/dcdn/dcdn/test.yaml:8

<test> ESTABLISH SSH CONNECTION FOR USER: root

<test> SSH: EXEC ssh -C -q -o ControlMaster=auto -o ControlPersist=60s -o ServerAliveInterval=60 -o Port=37226 -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o User=root -o ConnectTimeout=20 -o ControlPath=/root/.ansible/cp/ansible-ssh-%h-%p-%r test '/bin/sh -c '"'"'( umask 77 && mkdir -p "` echo $HOME/.ansible/tmp/ansible-tmp-1472114920.68-39125238251879 `" && echo ansible-tmp-1472114920.68-39125238251879="` echo $HOME/.ansible/tmp/ansible-tmp-1472114920.68-39125238251879 `" ) && sleep 0'"'"''

The process hang again;

Can i set a  strict execution time Ｓ， if running time longger than  S,then the process stop ? How to ?

ansible --version

ansible 2.1.1.0

  config file = /etc/ansible/ansible.cfg

  configured module search path = Default w/o overrides