⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot PPC64LE Fedora Stable Clang 3.x has failed when building commit a460ab3.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/435/builds/18) and take a look at the build logs.
4. Check if the failure is related to this commit (a460ab3) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/435/builds/18

Failed tests:

• test_ssl

Failed subtests:

• test_pha_required_nocert - test.test_ssl.TestPostHandshakeAuth

Summary of the results of the build (if available):

== Tests result: FAILURE then FAILURE ==

412 tests OK.

10 slowest tests:

• test_peg_generator: 3 min 46 sec
• test_concurrent_futures: 2 min 36 sec
• test_multiprocessing_spawn: 1 min 30 sec
• test_tokenize: 1 min 12 sec
• test_unparse: 1 min 5 sec
• test_multiprocessing_forkserver: 1 min 3 sec
• test_asyncio: 58.2 sec
• test_multiprocessing_fork: 53.9 sec
• test_lib2to3: 52.1 sec
• test_signal: 47.7 sec

1 test failed:
test_ssl

13 tests skipped:
test_devpoll test_ioctl test_kqueue test_msilib test_ossaudiodev
test_startfile test_tix test_tk test_ttk_guionly test_winconsoleio
test_winreg test_winsound test_zipfile64

1 re-run test:
test_ssl

Total duration: 6 min 3 sec

Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-ppc64le.clang/build/Lib/test/test_ssl.py", line -1, in test_pha_required_nocert
AssertionError: "tlsv13 alert certificate required" does not match "EOF occurred in violation of protocol (_ssl.c:2286)"


Traceback (most recent call last):
   File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-ppc64le.clang/build/Lib/test/test_ssl.py", line 2427, in run
    msg = self.read()
   File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-ppc64le.clang/build/Lib/test/test_ssl.py", line 2404, in read
    return self.sslconn.read()
   File "/home/buildbot/buildarea/3.x.cstratak-fedora-stable-ppc64le.clang/build/Lib/ssl.py", line 1131, in read
    return self._sslobj.read(len)
 ssl.SSLError: [SSL: PEER_DID_NOT_RETURN_A_CERTIFICATE] peer did not return a certificate (_ssl.c:2438)