Ansible hangs

While running my ansible playbook on 350 hosts, the ansible process hangs in between & shows a couple of defunct processes. Is there any way out i can resolve this,Please suggest

i m using below version :-

If this is on the same machine, it seams that you have mixed different versions of Ansible. Ansible 1.9.4 from a repository and Ansible 2.0.1.0 from another source like pip?

That would give you a lot of problem.