Loop label only renders first item when it uses based vars keywork variables

[juanvalino]

ISSUE TYPE

• Bug Report

COMPONENT NAME

loop

ANSIBLE VERSION

ansible 2.5.2
  config file = /home/juanval/.ansible.cfg
  configured module search path = [u'/home/juanval/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /home/juanval/.local/lib/python2.7/site-packages/ansible
  executable location = /usr/bin/ansible
  python version = 2.7.15 (default, May  9 2018, 11:18:37) [GCC 7.3.1 20180303 (Red Hat 7.3.1-5)]

CONFIGURATION

ANSIBLE_SSH_ARGS(/home/juanval/.ansible.cfg) = -F /home/juanval/.ssh/config -o ControlMaster=auto -o ControlPersist=30m
ANSIBLE_SSH_CONTROL_PATH(/home/juanval/.ansible.cfg) = ~/.ssh/master-%%r@%%h:%%p
CACHE_PLUGIN(/home/juanval/.ansible.cfg) = memory
DEFAULT_ACTION_PLUGIN_PATH(/home/juanval/.ansible.cfg) = [u'/usr/share/ansible_plugins/action_plugins']
DEFAULT_CALLBACK_PLUGIN_PATH(/home/juanval/.ansible.cfg) = [u'/usr/share/ansible_plugins/callback_plugins']
DEFAULT_CONNECTION_PLUGIN_PATH(/home/juanval/.ansible.cfg) = [u'/usr/share/ansible_plugins/connection_plugins']
DEFAULT_FILTER_PLUGIN_PATH(/home/juanval/.ansible.cfg) = [u'/usr/share/ansible_plugins/filter_plugins']
DEFAULT_FORKS(/home/juanval/.ansible.cfg) = 5                                                                                                               
DEFAULT_GATHERING(/home/juanval/.ansible.cfg) = implicit                                                                                                    
DEFAULT_HOST_LIST(/home/juanval/.ansible.cfg) = [u'/home/juanval/srv/ansible/inventory']                                                                    
DEFAULT_LOG_PATH(/home/juanval/.ansible.cfg) = /home/juanval/.ansible/log/ansible.log                                                                       
DEFAULT_LOOKUP_PLUGIN_PATH(/home/juanval/.ansible.cfg) = [u'/usr/share/ansible_plugins/lookup_plugins']                                                     
DEFAULT_MANAGED_STR(/home/juanval/.ansible.cfg) = Ansible managed. Don't modify it directly.                                                                
DEFAULT_POLL_INTERVAL(/home/juanval/.ansible.cfg) = 15                                                                                                      
DEFAULT_ROLES_PATH(/home/juanval/.ansible.cfg) = [u'/home/juanval/srv/ansible/roles']
DEFAULT_TIMEOUT(/home/juanval/.ansible.cfg) = 10
DEFAULT_TRANSPORT(/home/juanval/.ansible.cfg) = smart
DEFAULT_VARS_PLUGIN_PATH(/home/juanval/.ansible.cfg) = [u'/usr/share/ansible_plugins/vars_plugins']
HOST_KEY_CHECKING(/home/juanval/.ansible.cfg) = False
INVENTORY_ENABLED(/home/juanval/.ansible.cfg) = ['host_list', 'script', 'yaml', 'ini']

OS / ENVIRONMENT

N/A

SUMMARY

When the label keyword of a loop uses variables defined in a vars block, and those variables points to attributes of the iteration item, the rendered output always shows to the first item of the sequence.

STEPS TO REPRODUCE

- name: bug use case
  hosts: localhost
  vars:
    my_list:
      - name: Luke
        surname: Skywalker

      - name: Darth
        surname: Vader

      - name: Han
        surname: Solo

    surname_var: "{{ item.surname }}"

  tasks:
    - debug: msg="item.name={{ item.name }} item.surname={{ item.surname }} surname_var={{ surname_var }}"
      loop: "{{ my_list }}"
      loop_control:
        label: "{{ item.name }} {{ surname_var }}"

EXPECTED RESULTS

PLAY [bug use case] *************************************************************

TASK [Gathering Facts] **********************************************************
ok: [localhost]

TASK [debug] ********************************************************************
ok: [localhost] => (item=Luke Skywalker) => {
    "msg": "item.name=Luke item.surname=Skywalker surname_var=Skywalker"
}
ok: [localhost] => (item=Darth Vader) => {
    "msg": "item.name=Darth item.surname=Vader surname_var=Vader"
}
ok: [localhost] => (item=Han Solo) => {
    "msg": "item.name=Han item.surname=Solo surname_var=Solo"
}

PLAY RECAP **********************************************************************
localhost                  : ok=2    changed=0    unreachable=0    failed=0  

ACTUAL RESULTS

PLAY [bug use case] *************************************************************

TASK [Gathering Facts] **********************************************************
ok: [localhost]

TASK [debug] ********************************************************************
ok: [localhost] => (item=Luke Skywalker) => {
    "msg": "item.name=Luke item.surname=Skywalker surname_var=Skywalker"
}
ok: [localhost] => (item=Darth Skywalker) => {
    "msg": "item.name=Darth item.surname=Vader surname_var=Vader"
}
ok: [localhost] => (item=Han Skywalker) => {
    "msg": "item.name=Han item.surname=Solo surname_var=Solo"
}

PLAY RECAP **********************************************************************
localhost                  : ok=2    changed=0    unreachable=0    failed=0  

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[sivel]

Duplicate of #38899