segfault when using pygame for ~5 minutes

[Pycryptor10]

BPO	43671
Nosy	@terryjreedy, @serhiy-storchaka, @E-Paine, @Pycryptor10
Files	segfault.rtf aliens.py segfaultpygame.txt

^{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 = <Date 2021-04-03.01:30:12.944>
created_at = <Date 2021-03-30.14:34:47.086>
labels = ['expert-tkinter', '3.9', 'type-crash']
title = 'segfault when using pygame for ~5 minutes'
updated_at = <Date 2021-04-03.01:33:47.284>
user = 'https://github.com/Pycryptor10'

bugs.python.org fields:

activity = <Date 2021-04-03.01:33:47.284>
actor = 'terry.reedy'
assignee = 'none'
closed = True
closed_date = <Date 2021-04-03.01:30:12.944>
closer = 'terry.reedy'
components = ['Tkinter']
creation = <Date 2021-03-30.14:34:47.086>
creator = 'Pycryptor10'
dependencies = []
files = ['49919', '49920', '49921']
hgrepos = []
issue_num = 43671
keywords = []
message_count = 6.0
messages = ['389827', '389829', '389831', '389845', '389846', '390112']
nosy_count = 4.0
nosy_names = ['terry.reedy', 'serhiy.storchaka', 'epaine', 'Pycryptor10']
pr_nums = []
priority = 'normal'
resolution = 'third party'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue43671'
versions = ['Python 3.9']

[Pycryptor10]

Per the attached file, when testing an adapted version of pygame's alien script as part of research. Python segfaulted.

This has occured twice about 5 minutes in.

I had console running all messages at the time if more logs needed.

MacOS Big Sur 11.2.3 on MacBook Air (Retina, 13-inch, 2018) with 1.6 GHz Dual-Core Intel Core i5 & 8 GB 2133 MHz LPDDR3 Memory

[Pycryptor10]

Can reproduce with a modified pygame.examples.alien to run in a loop after a similar time.

[Pycryptor10]

Also filed pygame/pygame#2543 as not sure where issue comes from

[E-Paine]

Not sure why this was marked as a problem with tkinter (neither Pygame nor the example use it). I would be very surprised if this wasn't an issue with Pygame, as the Python is just requesting a dictionary deallocation which is then handled by Pygame's font.cpython-39-darwin.so.

[Pycryptor10]

My original script has tkinter used as well. I wasn't entirely sure where it was when I filed the bug at first and just saw a tk/tcl mentioned in the logs. It does look now I've managed to investigate further to be something in pygame. I've never had to debug a segfault before.

[terryjreedy]

I would not be surprised if using the gui features of both tkinter and pygame together did cause a crash, as both would be competing for the screen. Ditto if both were handling key and mouse events. That might be closed instead as "won't fix"