<dict> multiple operations of dict causes core dump of Python interpreter.

@rhettinger

BPO	43188
Nosy	@rhettinger, @terryjreedy, @methane, @CharlesFengY

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-02-10.09:44:21.101>
labels = ['interpreter-core', '3.9', 'type-crash']
title = '<dict> multiple operations of dict causes core dump of Python interpreter.'
updated_at = <Date 2021-02-13.05:07:49.877>
user = 'https://github.com/CharlesFengY'

bugs.python.org fields:

activity = <Date 2021-02-13.05:07:49.877>
actor = 'terry.reedy'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Interpreter Core']
creation = <Date 2021-02-10.09:44:21.101>
creator = 'CharlesFengY'
dependencies = []
files = []
hgrepos = []
issue_num = 43188
keywords = []
message_count = 4.0
messages = ['386766', '386811', '386812', '386907']
nosy_count = 4.0
nosy_names = ['rhettinger', 'terry.reedy', 'methane', 'CharlesFengY']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue43188'
versions = ['Python 3.9']

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 bpo-43185, bpo-43186, bpo-43187, this works better in 3.10.0a5, so I suspect it is another duplicate.

On main I get RecursionError this is fixed:

RecursionError: maximum recursion depth exceeded while calling a Python object

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<dict> multiple operations of dict causes core dump of Python interpreter. #87354

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<dict> multiple operations of dict causes core dump of Python interpreter. #87354

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CharlesFengY commented on Feb 10, 2021

rhettinger commented on Feb 10, 2021

methane commented on Feb 10, 2021

terryjreedy commented on Feb 13, 2021

kumaraditya303 commented on May 21, 2022

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