ansible/test/integration/targets/handlers/test_handlers_infinite_loop.yml

- hosts: A
  gather_facts: false
  tasks:
    - command: echo
      notify:
        - handler1
        - self_notify
  handlers:
    - name: handler1
      debug:
        msg: handler1 ran
      changed_when: true
      notify: handler2

    - name: handler2
      debug:
        msg: handler2 ran
      changed_when: true
      notify: handler1

    - name: self_notify
      debug:
        msg: self_notify ran
      changed_when: true
      notify: self_notify