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This is because the load_cert_chain function of the ssl module (_ssl.c) leaks the keyfile_bytes and certfile_bytes, and these tests import the ssl module.

Relevant upstream commits:

https://github.com/python/cpython/commit/3b91de5a76aad471476f5bc5943e44bf386c0e6d

https://github.com/python/cpython/commit/b3e073cbb3af2999e6e589f55ec2fc8a109fdc14

Made a build which includes these commits and the leaks are gone:
https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=12683751

Created attachment 1259615 [details]
fix ssl leaks

None of the reported memory leaks have been found in python-2.7.5-57.el7. Thanks!

TCMS Test results: https://tcms.engineering.redhat.com/run/308642/#caserun_15597934

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2017:1868