diff --git a/Lib/test/test_gc.py b/Lib/test/test_gc.py index d9e9622992f543..969d290c259f73 100644 --- a/Lib/test/test_gc.py +++ b/Lib/test/test_gc.py @@ -1522,6 +1522,19 @@ def test_ast_fini(self): """) assert_python_ok("-c", code) + def test_warnings_fini(self): + # See https://github.com/python/cpython/issues/137384 + code = textwrap.dedent(''' + import asyncio + from contextvars import ContextVar + + context_loop = ContextVar("context_loop", default=None) + loop = asyncio.new_event_loop() + context_loop.set(loop) + ''') + + assert_python_ok("-c", code) + def setUpModule(): global enabled, debug diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2025-08-22-11-39-40.gh-issue-137384.j4b_in.rst b/Misc/NEWS.d/next/Core_and_Builtins/2025-08-22-11-39-40.gh-issue-137384.j4b_in.rst new file mode 100644 index 00000000000000..583d751a460eb6 --- /dev/null +++ b/Misc/NEWS.d/next/Core_and_Builtins/2025-08-22-11-39-40.gh-issue-137384.j4b_in.rst @@ -0,0 +1 @@ +Fix a crash when using the :mod:`warnings` module in a finalizer at shutdown. Patch by Kumar Aditya. diff --git a/Python/pystate.c b/Python/pystate.c index aa2c4bd51814c3..02621f36d91c8a 100644 --- a/Python/pystate.c +++ b/Python/pystate.c @@ -914,7 +914,6 @@ interpreter_clear(PyInterpreterState *interp, PyThreadState *tstate) _Py_ClearExecutorDeletionList(interp); #endif _PyAST_Fini(interp); - _PyWarnings_Fini(interp); _PyAtExit_Fini(interp); // All Python types must be destroyed before the last GC collection. Python @@ -925,6 +924,9 @@ interpreter_clear(PyInterpreterState *interp, PyThreadState *tstate) _PyGC_CollectNoFail(tstate); _PyGC_Fini(interp); + // Finalize warnings after last gc so that any finalizers can + // access warnings state + _PyWarnings_Fini(interp); /* We don't clear sysdict and builtins until the end of this function. Because clearing other attributes can execute arbitrary Python code which requires sysdict and builtins. */