Segmentation fault on Python 3.8.0a4+

[hugovk]

What did you do?

Build master on Python 3.8-dev.

What did you expect to happen?

Build passes.

What actually happened?

Build fails.

.travis/script.sh: line 10: 16886 Segmentation fault      (core dumped) python -m pytest -vx --cov PIL --cov-report term Tests

• https://travis-ci.org/python-pillow/Pillow/jobs/540003603#L3245

What are your OS, Python and Pillow versions?

• OS: Ubuntu 16.04.6 LTS Xenial
• Python: 3.8.0a4+
• Pillow: master

The last passing master build used Python 3.8.0a3+:

• https://travis-ci.org/python-pillow/Pillow/jobs/538572358#L185

Python 3.8.0 release schedule:

• https://www.python.org/dev/peps/pep-0569/#schedule

[radarhere]

Testing, I find that removing --cov PIL from python -m pytest -vx --cov PIL --cov-report term Tests resolves the issue.

It is perhaps worth noting that pytest-cov is already looking into a different problem with Python 3.8a4.

[hugovk]

Fixed by deleting the build caches at https://travis-ci.org/python-pillow/Pillow/caches. Thanks to @radarhere for figuring it out.