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Showing content from https://github.com/pytest-dev/pytest-cov/issues/676 below:

Memory leak if a test contains the built-in `eval` · Issue #676 · pytest-dev/pytest-cov · GitHub

If I run a test that contains the built-in eval function, a memory leak occurs when executed with pytest-cov.

For example, if I run this code:

File tests_dummy.py

import resource


def test_dummy():
    for i in range(100_000):
        r = eval(f"'a' + '1'")
        assert r == 'a1'

        current_rss = resource.getrusage(resource.RUSAGE_SELF).ru_maxrss / 1024

        if i % 500 == 0:
            print(
                f"Round {i} Max RSS: {current_rss}"
            )

When I execute it with --cov="", the memory keeps increasing:

pytest -s --cov="" tests_dummy.py 
=============================================================================================== test session starts ===============================================================================================
platform linux -- Python 3.11.0, pytest-8.3.4, pluggy-1.5.0
rootdir: /home/.../projects/TEST
plugins: cov-6.0.0
collected 1 item                                                                                                                                                                                                  

tests_dummy.py Round 0 Max RSS: 45.87109375
Round 500 Max RSS: 46.12890625
Round 1000 Max RSS: 46.38671875
Round 1500 Max RSS: 46.64453125
Round 2000 Max RSS: 46.64453125
Round 2500 Max RSS: 46.90234375
Round 3000 Max RSS: 47.16015625
Round 3500 Max RSS: 47.41796875
Round 4000 Max RSS: 47.67578125
Round 4500 Max RSS: 47.93359375

However, if I pass --no-cov, the memory remains stable.

pytest -s --no-cov tests_dummy.py
=============================================================================================== test session starts ===============================================================================================
platform linux -- Python 3.11.0, pytest-8.3.4, pluggy-1.5.0
rootdir: /home/.../projects/TEST
plugins: cov-6.0.0
collected 1 item                                                                                                                                                                                                  

tests_dummy.py Round 0 Max RSS: 43.359375
Round 500 Max RSS: 43.359375
Round 1000 Max RSS: 43.359375
Round 1500 Max RSS: 43.359375
Round 2000 Max RSS: 43.359375
Round 2500 Max RSS: 43.359375
Round 3000 Max RSS: 43.359375
Round 3500 Max RSS: 43.359375
Round 4000 Max RSS: 43.359375
Round 4500 Max RSS: 43.359375
Round 5000 Max RSS: 43.359375
...
Round 1647500 Max RSS: 779.58984375

Python 3.11.0/Python 3.10.5/Python 3.13.1

python -m pip freeze                        
coverage==7.6.10
iniconfig==2.0.0
packaging==24.2
pluggy==1.5.0
pytest==8.3.4
pytest-cov==6.0.0

No .coveragerc
No setup.cfg

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