gh-144307: Fix a reference leak during module teardown (GH-144308)

(cherry picked from commit 219b7ac)

Co-authored-by: Yongtao Huang <yongtaoh2022@gmail.com>
Signed-off-by: Yongtao Huang <yongtaoh2022@gamil.com>
Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>

Author: 2 people

Misc/NEWS.d/next/Core_and_Builtins/2026-01-29-02-18-08.gh-issue-144307.CLbm_o.rst

@@ -0,0 +1 @@
+Prevent a reference leak in module teardown at interpreter finalization.

Python/pylifecycle.c

@@ -1601,6 +1601,7 @@ finalize_remove_modules(PyObject *modules, int verbose)
                 PyObject *value = PyObject_GetItem(modules, key);
                 if (value == NULL) {
                     PyErr_FormatUnraisable("Exception ignored while removing modules");
+                    Py_DECREF(key);
                     continue;
                 }
                 CLEAR_MODULE(key, value);