fix(structseq): enable GC tracking in PyStructSequence_New

Author: ashm-dev

Lib/test/test_structseq.py

@@ -365,5 +365,10 @@ def test_replace_gc_tracked(self):
 
         self.assertTrue(gc.is_tracked(replaced_struct))
 
+    def test_gc_tracked(self):
+        # PyStructSequence objects created via C API or Python should be GC-tracked
+        self.assertTrue(gc.is_tracked(time.gmtime()))
+        self.assertTrue(gc.is_tracked(os.stat(__file__)))
+
 if __name__ == "__main__":
     unittest.main()

Misc/NEWS.d/next/Core_and_Builtins/2026-09-08-15-55-00.gh-issue-157176.yZ8a1B.rst

@@ -0,0 +1 @@
+Fix GC tracking for :class:`!PyStructSequence` instances created via :c:func:`PyStructSequence_New`. Patch by Shamil Abdulaev.

Objects/structseq.c

@@ -84,6 +84,7 @@ PyStructSequence_New(PyTypeObject *type)
     for (i = 0; i < size; i++)
         obj->ob_item[i] = NULL;
 
+    _PyObject_GC_TRACK(obj);
     return (PyObject*)obj;
 }
 
@@ -265,7 +266,6 @@ structseq_new_impl(PyTypeObject *type, PyObject *arg, PyObject *dict)
         }
     }
 
-    _PyObject_GC_TRACK(res);
     return (PyObject*) res;
 }
 
@@ -449,7 +449,6 @@ structseq_replace(PyObject *op, PyObject *args, PyObject *kwargs)
         }
     }
 
-    _PyObject_GC_TRACK(result);
     return (PyObject *)result;
 
 error: