Travis-CI python3.6 Tox launching virtualenv error

Question

We are using tox for py36 test environment setup through travis-ci , the tests start breaking in 2021-10-23.

The error that we are getting is:

$ tox
GLOB sdist-make: /home/travis/build/apache/incubator-marvin/python-toolbox/setup.py
py36 create: /home/travis/build/apache/incubator-marvin/python-toolbox/.tox/py36
ERROR: invocation failed (exit code 1), logfile: /home/travis/build/apache/incubator-marvin/python-toolbox/.tox/py36/log/py36-0.log
================================== log start ===================================
StopIteration: 
=================================== log end ====================================
ERROR: InvocationError for command /home/travis/virtualenv/python3.6.7/bin/python -m virtualenv --no-download --python /home/travis/virtualenv/python3.6.7/bin/python py36 (exited with code 1)
___________________________________ summary ____________________________________
ERROR:   py36: InvocationError for command /home/travis/virtualenv/python3.6.7/bin/python -m virtualenv --no-download --python /home/travis/virtualenv/python3.6.7/bin/python py36 (exited with code 1)
The command "tox" exited with 1.

Full Log Travis-CI Link

The log showed that the process had failed while launching virtualenv even before package installation.

We had also tested with tox -rvve py36 for more logs:

Another log with Travis-CI Link

The test result showed that /home/travis/virtualenv/python3.6.7/bin/python does exist, and can be successfully executed.

What is weird to us is that the same setting used to be able to run without failure in 2021-10-22:

Previous log with Travis-CI Link

And the only difference seem to be the version change of virtualenv , which is changing from 20.8.1 to 20.9.0 or 20.10.0 .

Does anyone know how this can be fixed?

Answer 1

After some experiments, we found that there are many dependencies that could be the cause of this error.

For our case, it is the OpenSSL version in the Ubuntu.

https://github.com/apache/incubator-marvin/pull/59