Crash report

What happened?

gh-108517 (fix for gh-108295) added PyObject_ClearWeakRefs() to typevar_dealloc, paramspec_dealloc, and typevartuple_dealloc, but missed paramspecattr_dealloc(). Both paramspecargs_spec and paramspeckwargs_spec set Py_TPFLAGS_MANAGED_WEAKREF, so the same crash from gh-108295 still occurs for ParamSpec(...).args and ParamSpec(...).kwargs.

  import weakref
  from typing import ParamSpec, TypeVar

  def probe(label, make):
      obj = make()
      fired = []
      r = weakref.ref(obj, lambda ref: fired.append(True))
      del obj
      print(f"  {label:16s} callback_fired={bool(fired)!s:5s}")
      del r

  probe("TypeVar",       lambda: TypeVar("T"))         # Works fine
  probe("ParamSpecArgs", lambda: ParamSpec("P").args)   # segfault

CPython versions tested on:

3.12, 3.13, 3.14, 3.15, 3.16, CPython main branch

Operating systems tested on:

Linux

Output from running 'python -VV' on the command line:

No response

Linked PRs

• gh-157621: Clear weakrefs for ParamSpec attributes #157622
• [3.15] gh-157621: Clear weakrefs for ParamSpec attributes (GH-157622) #157653
• [3.14] gh-157621: Clear weakrefs for ParamSpec attributes (GH-157622) #157654
• [3.13] gh-157621: Clear weakrefs for ParamSpec attributes (GH-157622) #157655