synchronize hangs infinitely with delegate_to and when it can't login with ssh key

[malformed-c]

Related #219 but it seems abandoned

SUMMARY

Use synchronize to copy from remote to remote with delegate_to, but when ssh key is not copied synchronize just hangs infinitely, the workaround is to set timeout (what about big files) but I think it should fail with error

ISSUE TYPE

• Bug Report

COMPONENT NAME

synchronize

ANSIBLE VERSION

ansible [core 2.18.0]
  config file = None
  configured module search path = ['/home/engi/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python3.12/site-packages/ansible
  ansible collection location = /home/engi/.ansible/collections:/usr/share/ansible/collections
  executable location = /usr/bin/ansible
  python version = 3.12.7 (main, Oct  1 2024, 11:15:50) [GCC 14.2.1 20240910] (/usr/bin/python)
  jinja version = 3.1.4
  libyaml = True

COLLECTION VERSION

# /usr/lib/python3.12/site-packages/ansible_collections
Collection    Version
------------- -------
ansible.posix 1.6.2  

CONFIGURATION

CONFIG_FILE() = None

GALAXY_SERVERS:

OS / ENVIRONMENT

Arch Linux, target Ubuntu

STEPS TO REPRODUCE

use synchronize to copy remote to remote, but don't copy ssh keys

EXPECTED RESULTS

Fail with error

ACTUAL RESULTS

Hangs indefinitely