Ansible script module - Control socket permission denied

Question

I'm new to Ansible and trying to run a local script on a remote node using the script module. My task is defined as follows:

- name: Initial setup
  script:  ../../../initial_setup.sh
  become: yes

When I run the playbook I get the error below but I'm not clear on what the actual problem is. Does this indicate a problem connecting to the node or a problem transferring the script?

fatal: [default]: FAILED! => {
    "changed": true,
    "failed": true,
    "invocation": {
        "module_args": {
            "_raw_params": "../../../initial_setup.sh"
        },
        "module_name": "script"
    },
    "rc": 127,
    "stderr": "Control socket connect(/tmp): Permission denied\r\nControlSocket /tmp already exists, disabling multiplexing\r\nConnection to 127.0.0.1 closed.\r\n",
    "stdout": "/bin/sh: 1: /home/ubuntu/.ansible/tmp/ansible-tmp-1482161914.64-107588947758469/initial_setup.sh: not found\r\n",
    "stdout_lines": [
        "/bin/sh: 1: /home/ubuntu/.ansible/tmp/ansible-tmp-1482161914.64-107588947758469/initial_setup.sh: not found"
    ]
}

Answer 1

tl;dr

Ensure -o ControlMaster=auto is defined in ssh_args in Ansible in ansible.cfg:

[ssh_connection]
ssh_args = -o ControlMaster=auto -o ControlPersist=60s

---

The following error is related to SSH connection multiplexing:

Control socket connect(/tmp): Permission denied
ControlSocket /tmp already exists, disabling multiplexing
Connection to 127.0.0.1 closed

It tried to create a socket directly at /tmp, not inside /tmp... Some other parameter defined somewhere for SSH could play role here.

Setting the value of ControlMaster to auto causes SSH to create a new master connection should the existing one not exist (or have problems, as here?).