Windows fatal exception: access violation - shapes.py line 65

See original GitHub issue

Experiencing irregular python interpreter crashes. Crash happens 20-30% of the time that error producing line is executed. Code is using a multiprocessing pool, dont know if that is relevant but thought it might be worth mentioning.

Error found by using pythons in-built faulthandler module. Full traceback below:

Windows fatal exception: access violation

Current thread 0x00000a28 (most recent call first):
  File "C:\Users\OolongJunSun\AppData\Local\Programs\Python\Python310\lib\site-packages\pymunk\shapes.py", line 65 in shapefree
  File "D:\02_Projects\03_Active\Evolution\Crawl-Eat-Die-Repeat-broken\population.py", line 42 in generate_individuals
  File "D:\02_Projects\03_Active\Evolution\Crawl-Eat-Die-Repeat-broken\main.py", line 113 in <module>

Line 42 of my population.py script is resetting a dictionary containing a 500 class instances with variables made up of pymunk objects.

OS: Windows 10 PY: Python 3.10.4

Issue Analytics

State:
Created a year ago
Comments:13 (5 by maintainers)

Top GitHub Comments

2reactions

viblocommented, May 28, 2022

Ok, great that you found a workaround! I will still keep this issue open for a while, while I research it a bit more.

1reaction

viblocommented, May 27, 2022

Ah, it became a bit easier to validate different theories around this error when I could trigger the error more often with a higher n_genes. It seems like the error reduces (or completely goes away) when I manually remove the shapes and reset their bodies to None in evaluate_individual, just after the while loop like this:

for shape in env.space.shapes:
    env.space.remove(shape)
    shape.body = None

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