test_pyrepl leaks references

[vstinner]

Since commit fe92193, test_pyrepl started to leak a lot of references.

commit fe921931a35b461fb81821a474b510f4d67c520b (HEAD)
Author: Lysandros Nikolaou <lisandrosnik@gmail.com>
Date:   Mon May 20 17:57:32 2024 -0400

    gh-111201: Add tests for unix console class in pyrepl (#118653)

Example:

$ ./python -m test test_pyrepl -u all -R 3:3
(...)
test_pyrepl leaked [8943, 8939, 8943] references, sum=26825
test_pyrepl leaked [3138, 3136, 3138] memory blocks, sum=9412
(...)

cc @lysnikolaou

Linked PRs

• gh-119469: Fix _pyrepl reference leaks #119470
• [3.13] gh-119469: Fix _pyrepl reference leaks (GH-119470) #119471

[vstinner]

The problem comes from self.old_sigwinch = signal.signal(signal.SIGWINCH, self.__sigwinch) in UnixConsole.prepare(). The test doesn't call console.restore().

[ambv]

thanks for the super quick investigation, Victor

[vstinner]

Python 3.13 is also affected. Example:

$ ./python -m test test_pyrepl -u all -R 3:3 -m test_simple_addition
(...)
test_pyrepl leaked [851, 851, 851] references, sum=2553
test_pyrepl leaked [289, 289, 289] memory blocks, sum=867

[ambv]

Will backport.