[issue38172] Python 3.8 Segfult with Bandersnatch pytest Suite

[Cooper Lees]

New submission from Cooper Lees <me at cooperlees.com>:

Haven't done research but bandersnatch's (https://github.com/pypa/bandersnatch) Unit tests pass in 3.7 and cause Python to Segmentation Fault in Python 3.8.0b4+.

```
py38 run-test: commands[0] | coverage run -m pytest
============================= test session starts ==============================
platform linux -- Python 3.8.0b4+, pytest-5.1.2, py-1.8.0, pluggy-0.13.0
cachedir: .tox/py38/.pytest_cache
rootdir: /home/travis/build/pypa/bandersnatch, inifile: pytest.ini
plugins: timeout-1.3.3
Fatal Python error: Segmentation fault
```

Full failure on Travis CI: https://travis-ci.org/pypa/bandersnatch/jobs/584973434

----------
messages: 352432
nosy: cooperlees
priority: normal
severity: normal
status: open
title: Python 3.8 Segfult with Bandersnatch pytest Suite
type: crash
versions: Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38172>
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