Bug report

Starting in Python 3.10.6, the following code raises an exception:

from inspect import signature
from unittest.mock import AsyncMock

mock = AsyncMock()
signature(mock)

• No exception is raised when Mock is used.
• The exception does not occur with Python 3.10.5.

Your environment

• CPython versions tested on: 3.10.4, 3.10.5, 3.10.6 (Only occurs in 3.10.6)
• Operating system and architecture: Windows 10, Linux (Official Docker Image)

Linked PRs

• gh-96127: Fix inspect.signature call on mocks #96335
• [3.11] gh-96127: Fix inspect.signature call on mocks (#96335) #101646
• [3.10] gh-96127: Fix inspect.signature call on mocks (#96335) #101647
• [3.10] Fix inspect.signature call on mocks (#96335) (gh-96127) #108652