_tracemalloc__get_object_traceback doesn't handle objects with pre-headers correctly #101430
Description
In the main branch, the function _tracemalloc__get_object_traceback doesn't account for objects with preheaders:
cpython/Modules/_tracemalloc.c
Lines 1406 to 1414 in ea23271
This means that when running with tracemalloc some allocation tracebacks are missing:
import warnings
class MyClass:
def __del__(self):
warnings.warn("Uh oh", ResourceWarning, source=self)
def func():
m = MyClass()
func()python3 -Wd -X tracemalloc=2 example.py
cc @markshannon