Fix calculation of PyListObject size in allocator

MazinSharaf · web-flow · commit 6eb4ec8c3bf1 · 2026-04-07T10:59:22.000+10:00
diff --git a/Objects/listobject.c b/Objects/listobject.c
@@ -234,7 +234,7 @@ _PyList_DebugMallocStats(FILE *out)
     _PyDebugAllocatorStats(out,
                            "free PyListObject",
                             _Py_FREELIST_SIZE(lists),
-                           sizeof(PyListObject));
+                           _PyType_PreHeaderSize(&PyList_Type) + sizeof(PyListObject));
 }
 
 PyObject *

Original file line number	Diff line number	Diff line change
`@@ -234,7 +234,7 @@ _PyList_DebugMallocStats(FILE *out)`
`234`	`234`	`_PyDebugAllocatorStats(out,`
`235`	`235`	`"free PyListObject",`
`236`	`236`	`_Py_FREELIST_SIZE(lists),`
`237`		`- sizeof(PyListObject));`
	`237`	`+ _PyType_PreHeaderSize(&PyList_Type) + sizeof(PyListObject));`
`238`	`238`	`}`
`239`	`239`
`240`	`240`	`PyObject *`