Recursion Depth Exceeded Causes Crash

In IDLE:

Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 23:03:10) [MSC v.1916 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> class Vec2:
...     def __init__(self, x=0.0, y=0.0):
...             self.x = x
...             self.y = y
...     def __mul__(self, other):
...             if type(other) is not Vec2:
...                     result = Vec2()
...                     result.x = self.x * other
...                     result.y = self.y * other
...                     return result
...             else:
...                     return self.x*other.x + self.y*other.y
...     def __rmul__(self, other):
...             # introduce bug where self and other should be swapped
...             return other * self
...
>>> x = Vec2(1.0, 1.0)
>>> x * 2
<__main__.Vec2 object at 0x0000016278FA7100>
>>> 2 * x
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 15, in __rmul__
  File "<stdin>", line 15, in __rmul__
  File "<stdin>", line 15, in __rmul__
  [Previous line repeated 996 more times]
RecursionError: maximum recursion depth exceeded

Running in iPython, instead of a RecursionError, the program directly crashes. After the crash, the ERRORLEVEL flag is set to -1073741571. On pip 19.2.3, these are the following dependencies,

Package          Version
---------------- -------
backcall         0.1.0
colorama         0.4.3
cycler           0.10.0
decorator        4.4.2
ipython          7.13.0
ipython-genutils 0.2.0
jedi             0.16.0
kiwisolver       1.1.0
matplotlib       3.2.1
numpy            1.18.2
parso            0.6.2
pickleshare      0.7.5
pip              19.2.3
prompt-toolkit   3.0.4
Pygments         2.6.1
pyparsing        2.4.6
python-dateutil  2.8.1
setuptools       41.2.0
six              1.14.0
traitlets        4.3.3
wcwidth          0.1.8

[acbart]

To make this more reproducible:

import sys
sys.setrecursionlimit(10000)

exec('''def x():
     x()
x()''')

Changing the recursionlimit to be something like 1000 avoids the issue, though. I can recover from the maximum recursion error.

[DiegoBaldassarMilleuno]

I can confirm this is affecting me as well, with Python 3.10.4 on Windows 11; it is also affecting JupyterLab, as one might expect.

Packages

Package              Version
-------------------- -----------
anyio                3.6.1
argon2-cffi          21.3.0
argon2-cffi-bindings 21.2.0
asttokens            2.0.5
attrs                21.4.0
Babel                2.10.1
backcall             0.2.0
beautifulsoup4       4.11.1
bleach               5.0.0
certifi              2021.10.8
cffi                 1.15.0
charset-normalizer   2.0.12
colorama             0.4.4
cycler               0.11.0
debugpy              1.6.0
decorator            5.1.1
defusedxml           0.7.1
entrypoints          0.4
executing            0.8.3
fastjsonschema       2.15.3
fonttools            4.33.3
idna                 3.3
ipykernel            6.15.0
ipympl               0.9.1
ipython              8.4.0
ipython-genutils     0.2.0
ipywidgets           7.7.1
jedi                 0.18.1
Jinja2               3.1.2
json5                0.9.8
jsonschema           4.5.1
jupyter-client       7.3.4
jupyter-core         4.10.0
jupyter-server       1.18.0
jupyterlab           3.4.3
jupyterlab-pygments  0.2.2
jupyterlab-server    2.14.0
jupyterlab-widgets   1.1.1
kiwisolver           1.4.2
MarkupSafe           2.1.1
matplotlib           3.5.2
matplotlib-inline    0.1.3
mistune              0.8.4
mpmath               1.2.1
nbclassic            0.3.7
nbclient             0.6.3
nbconvert            6.5.0
nbformat             5.4.0
nest-asyncio         1.5.5
notebook             6.4.12
notebook-shim        0.1.0
numpy                1.22.3
packaging            21.3
pandoc               2.2
pandocfilters        1.5.0
parso                0.8.3
pickleshare          0.7.5
Pillow               9.1.0
pip                  22.1.2
plumbum              1.7.2
ply                  3.11
prometheus-client    0.14.1
prompt-toolkit       3.0.29
psutil               5.9.0
pure-eval            0.2.2
pycparser            2.21
Pygments             2.12.0
pyparsing            3.0.9
pyrsistent           0.18.1
python-dateutil      2.8.2
pytz                 2022.1
pywin32              304
pywinpty             2.0.5
pyzmq                23.2.0
requests             2.27.1
scipy                1.8.0
Send2Trash           1.8.0
setuptools           58.1.0
six                  1.16.0
sniffio              1.2.0
soupsieve            2.3.2.post1
stack-data           0.2.0
sympy                1.10.1
terminado            0.15.0
tinycss2             1.1.1
tornado              6.1
traitlets            5.2.1.post0
urllib3              1.26.9
wcwidth              0.2.5
webencodings         0.5.1
websocket-client     1.3.2
widgetsnbextension   3.6.1