[Rohan-Dedhia]

Fixes #15333.

Problem

When collecting doctests on modules that import unittest.mock.call (or objects with dynamic attribute resolution that simulate mock wrapping), inspect.unwrap traverses __wrapped__ attributes up to sys.getrecursionlimit(). Because call.__wrapped__ generates a new _Call instance on each access, inspect.unwrap builds a memo dictionary containing thousands of distinct objects, allocating gigabytes of memory and potentially causing OOM when the recursion limit is raised.

MockAwareDocTestFinder in src/_pytest/doctest.py previously overrode _find to run under _patch_unwrap_mock_aware() and skip _is_mocked objects (#3456). That override was previously conditioned on sys.version_info < (3, 10) and was removed during cleanup of Python 3.9 support. However, inspect.unwrap in stdlib across Python 3.10+ still encounters unbounded recursion on unittest.mock.call.

Solution

• Restore _find on MockAwareDocTestFinder to run under with _patch_unwrap_mock_aware(): and skip _is_mocked objects.
• Add a regression test with an elevated recursion limit (sys.setrecursionlimit(5000)).
• Add towncrier newsfragment changelog/15333.bugfix.rst.

[RonnyPfannschmidt]

ai missuse/missatribution