In the following programs, we call check_reentrant_insertion("s") twice,  after multiple of update and clear of dict, the Python interpreter crashes.
+++++++++++++++++++++++++++++++++++++++++++
def check_reentrant_insertion(mutate):

        class Mutating:
            def __del__(self):
                mutate(d)

        d = {k: Mutating() for k in 'abcdefghijklmnopqr'}
        for k in list(d):
            d[k] = k

def test_reentrant_insertion():

    check_reentrant_insertion("s")

    def mutate(d):
        d.update(DictTest.__dict__)
        d.clear()
    check_reentrant_insertion(test_reentrant_insertion())

test_reentrant_insertion()
+++++++++++++++++++++++++++++++++++++++++

System Info: Ubuntu 16.04
Python Version:  Python 3.9.1

I can confirm this crashes.

Is this the crash you are reporting?

```
Exception ignored in: <function check_reentrant_insertion.<locals>.Mutating.__del__ at 0x100d35af0>
Traceback (most recent call last):
  File "/Users/methane/work/python/cpython/PC/xxx.py", line 5, in __del__
    mutate(d)
TypeError: 'str' object is not callable
Exception ignored in: <function check_reentrant_insertion.<locals>.Mutating.__del__ at 0x100d35c10>
Traceback (most recent call last):
  File "/Users/methane/work/python/cpython/PC/xxx.py", line 5, in __del__
Fatal Python error: _Py_CheckRecursiveCall: Cannot recover from stack overflow.
Python runtime state: initialized

Current thread 0x000000010072bd40 (most recent call first):
  File "/Users/methane/work/python/cpython/xxx.py", line 9 in check_reentrant_insertion
  File "/Users/methane/work/python/cpython/xxx.py", line 13 in test_reentrant_insertion
  File "/Users/methane/work/python/cpython/xxx.py", line 18 in test_reentrant_insertion
...
```

Like the code in #43185, #43186, #43187, this works better in 3.10.0a5, so I suspect it is another duplicate.