Hi,

after upgrading to -current, ansible breaks thusly with a fairly large
playbook:

TASK [nginx : nginx package] *******************************************************
Exception in thread Thread-4 (results_thread_main):
Traceback (most recent call last):
  File "/usr/local/lib/python3.12/threading.py", line 1075, in _bootstrap_inner
    self.run()
  File "/usr/local/lib/python3.12/threading.py", line 1012, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/local/lib/python3.12/site-packages/ansible/plugins/strategy/__init__.py", line 108, in results_thread_main
    result = strategy._convert_wire_task_result_to_raw(result)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/ansible/plugins/strategy/__init__.py", line 456, in _convert_wire_task_result_to_raw
    found_task = self._queued_task_cache[queue_cache_entry]['task']
                 ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
KeyError: ('vultr.tlakh.xyz', '8030069b-a76a-55d4-9169-0000000000a8')

======  hangs here ====

^C results in:

[ERROR]: Unexpected Exception, this is probably a bug: [Errno 3] No such process

Traceback (most recent call last):
  File "/usr/local/lib/python3.12/site-packages/ansible/cli/__init__.py", line 660, in cli_executor
    exit_code = cli.run()
                ^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/ansible/cli/playbook.py", line 153, in run
    results = pbex.run()
              ^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/ansible/executor/playbook_executor.py", line 188, in run
    result = self._tqm.run(play=play)
             ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/ansible/executor/task_queue_manager.py", line 344, in run
    play_return = strategy.run(iterator, play_context)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/ansible/plugins/strategy/linear.py", line 216, in run
    results.extend(self._wait_on_pending_results(iterator))
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/ansible/plugins/strategy/__init__.py", line 796, in _wait_on_pending_results
    time.sleep(C.DEFAULT_INTERNAL_POLL_INTERVAL)
  File "/usr/local/lib/python3.12/site-packages/ansible/executor/process/worker.py", line 110, in _term
    os.killpg(self.pid, signum)
ProcessLookupError: [Errno 3] No such process

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/local/lib/python3.12/site-packages/ansible/cli/__init__.py", line 669, in cli_executor
    raise AnsibleError("Unexpected Exception, this is probably a bug.") from ex
ansible.errors.AnsibleError: Unexpected Exception, this is probably a bug: [Errno 3] No such process

------------------------------------------------------------------------

Ansible is pretty far into the playbook at this point, running for a few
minutes. I'm managing all my infra using ansible. Different hosts hang
at different points in the playbook (because they do different things),
But the playbook always stops at the same point for a particular host.

Downgrading to ansible-11.7.0 / ansible-core-2.18.6 fixes this.

Thanks,
Florian

-- 
In my defence, I have been left unsupervised.