"meta: reset_connection" fails with "become: true" using 0.2.9

[mkowalski]

Hi,

Contrary to the release notes for 0.2.9, meta: reset_connection is still failing when used with become: true using the environment specified below.

Ansible 2.8.10
Mitogen 0.2.9
Python (host and target) 3.5.2
Ubuntu 16.04
Strategy mitogen_linear

The following snippet can be used to reproduce the issue

- name: Force reconnection
  meta: reset_connection

- hosts: all
  roles:
    - testing
  become: yes

With the following error appearing

ERROR! [mux  17655] 07:14:35.440029 E mitogen.service: Pool(c128, size=32, th='mitogen.Pool.c128.25'): while invoking 'reset' of 'ansible_mitogen.services.ContextService'
Traceback (most recent call last):
  File "/home/ubuntu/ansible/plugins/mitogen-0.2.9/mitogen/service.py", line 621, in _on_service_call
    return invoker.invoke(method_name, kwargs, msg)
  File "/home/ubuntu/ansible/plugins/mitogen-0.2.9/mitogen/service.py", line 307, in invoke
    response = self._invoke(method_name, kwargs, msg)
  File "/home/ubuntu/ansible/plugins/mitogen-0.2.9/mitogen/service.py", line 293, in _invoke
    ret = method(**kwargs)
  File "/home/ubuntu/ansible/plugins/mitogen-0.2.9/ansible_mitogen/services.py", line 186, in reset
    mitogen.core.listen(context, 'disconnect', l.put)
  File "/home/ubuntu/ansible/plugins/mitogen-0.2.9/mitogen/core.py", line 431, in listen
    _signals(obj, name).append(func)
  File "/home/ubuntu/ansible/plugins/mitogen-0.2.9/mitogen/core.py", line 421, in _signals
    obj.__dict__
AttributeError: 'NoneType' object has no attribute '__dict__'
ERROR! Unexpected Exception, this is probably a bug: builtins.AttributeError: 'NoneType' object has no attribute '__dict__'
  File "/home/ubuntu/ansible/plugins/mitogen-0.2.9/mitogen/service.py", line 621, in _on_service_call
    return invoker.invoke(method_name, kwargs, msg)
  File "/home/ubuntu/ansible/plugins/mitogen-0.2.9/mitogen/service.py", line 307, in invoke
    response = self._invoke(method_name, kwargs, msg)
  File "/home/ubuntu/ansible/plugins/mitogen-0.2.9/mitogen/service.py", line 293, in _invoke
    ret = method(**kwargs)
  File "/home/ubuntu/ansible/plugins/mitogen-0.2.9/ansible_mitogen/services.py", line 186, in reset
    mitogen.core.listen(context, 'disconnect', l.put)
  File "/home/ubuntu/ansible/plugins/mitogen-0.2.9/mitogen/core.py", line 431, in listen
    _signals(obj, name).append(func)
  File "/home/ubuntu/ansible/plugins/mitogen-0.2.9/mitogen/core.py", line 421, in _signals
    obj.__dict__

ERROR! Unexpected Exception, this is probably a bug: builtins.AttributeError: 'NoneType' object has no attribute '__dict__'
  File "/home/ubuntu/ansible/plugins/mitogen-0.2.9/mitogen/service.py", line 621, in _on_service_call
    return invoker.invoke(method_name, kwargs, msg)
  File "/home/ubuntu/ansible/plugins/mitogen-0.2.9/mitogen/service.py", line 307, in invoke
    response = self._invoke(method_name, kwargs, msg)
  File "/home/ubuntu/ansible/plugins/mitogen-0.2.9/mitogen/service.py", line 293, in _invoke
    ret = method(**kwargs)
  File "/home/ubuntu/ansible/plugins/mitogen-0.2.9/ansible_mitogen/services.py", line 186, in reset
    mitogen.core.listen(context, 'disconnect', l.put)
  File "/home/ubuntu/ansible/plugins/mitogen-0.2.9/mitogen/core.py", line 431, in listen
    _signals(obj, name).append(func)
  File "/home/ubuntu/ansible/plugins/mitogen-0.2.9/mitogen/core.py", line 421, in _signals
    obj.__dict__

to see the full traceback, use -vvv

(more extended log - log.txt)

Related-issue: https://github.com/dw/mitogen/issues/633

[s1113950]

https://github.com/dw/mitogen/issues/655 had a similar traceback to yours; can you try my branch here: https://github.com/dw/mitogen/pull/710 and see if it works for you? The part that triggers the bug is when a reset is called but there's no call stack context to disconnect from.

[mkowalski]

The branch has been merged and it's been quite some time since this bug has been opened. I'll close it and reopen if it by any chance happens again