[issue34068] Assertion failure in _PyType_Lookup

[Serhiy Storchaka]

New submission from Serhiy Storchaka <storchaka+cpython at gmail.com>:

I got the following failure when running tests with coverage on VSTS.

https://python.visualstudio.com/cpython/cpython%20Team/_build/results?buildId=14680&view=logs

2018-07-05T12:11:22.0719913Z 0:17:49 load avg: 0.82 [373/413] test_urllib
2018-07-05T12:11:22.2574704Z python: Objects/typeobject.c:3086: _PyType_Lookup: Assertion `!PyErr_Occurred()' failed.
2018-07-05T12:11:22.2603179Z Fatal Python error: Aborted
2018-07-05T12:11:22.2608453Z 
2018-07-05T12:11:22.2622441Z Current thread 0x00007fb6465c7700 (most recent call first):
2018-07-05T12:11:22.2634973Z   File "/opt/vsts/work/1/s/Lib/http/client.py", line 405 in close
2018-07-05T12:11:22.2650517Z   File "/opt/vsts/work/1/s/Lib/traceback.py", line 216 in clear_frames
2018-07-05T12:11:22.2663944Z   File "/opt/vsts/work/1/s/Lib/unittest/case.py", line 205 in __exit__
2018-07-05T12:11:22.2676467Z   File "/opt/vsts/work/1/s/Lib/test/test_urllib.py", line 368 in test_invalid_redirect
2018-07-05T12:11:22.2704792Z   File "/opt/vsts/work/1/s/Lib/unittest/case.py", line 615 in run
2018-07-05T12:11:22.2727078Z   File "/opt/vsts/work/1/s/Lib/unittest/case.py", line 663 in __call__
2018-07-05T12:11:22.2738921Z   File "/opt/vsts/work/1/s/Lib/unittest/suite.py", line 122 in run
2018-07-05T12:11:22.2754215Z   File "/opt/vsts/work/1/s/Lib/unittest/suite.py", line 84 in __call__
2018-07-05T12:11:22.2768065Z   File "/opt/vsts/work/1/s/Lib/unittest/suite.py", line 122 in run
2018-07-05T12:11:22.2784999Z   File "/opt/vsts/work/1/s/Lib/unittest/suite.py", line 84 in __call__
2018-07-05T12:11:22.2797611Z   File "/opt/vsts/work/1/s/Lib/unittest/suite.py", line 122 in run
2018-07-05T12:11:22.2813174Z   File "/opt/vsts/work/1/s/Lib/unittest/suite.py", line 84 in __call__
2018-07-05T12:11:22.2826999Z   File "/opt/vsts/work/1/s/Lib/test/support/__init__.py", line 1782 in run
2018-07-05T12:11:22.2841544Z   File "/opt/vsts/work/1/s/Lib/test/support/__init__.py", line 1883 in _run_suite
2018-07-05T12:11:22.2854173Z   File "/opt/vsts/work/1/s/Lib/test/support/__init__.py", line 1973 in run_unittest
2018-07-05T12:11:22.2868193Z   File "/opt/vsts/work/1/s/Lib/test/libregrtest/runtest.py", line 175 in test_runner
2018-07-05T12:11:22.2883280Z   File "/opt/vsts/work/1/s/Lib/test/libregrtest/runtest.py", line 179 in runtest_inner
2018-07-05T12:11:22.2898238Z   File "/opt/vsts/work/1/s/Lib/test/libregrtest/runtest.py", line 140 in runtest
2018-07-05T12:11:22.2912684Z   File "/opt/vsts/work/1/s/Lib/test/libregrtest/main.py", line 384 in run_tests_sequential
2018-07-05T12:11:22.2927233Z   File "/opt/vsts/work/1/s/Lib/test/libregrtest/main.py", line 488 in run_tests
2018-07-05T12:11:22.2941508Z   File "/opt/vsts/work/1/s/Lib/test/libregrtest/main.py", line 566 in _main
2018-07-05T12:11:22.2955879Z   File "/opt/vsts/work/1/s/Lib/test/libregrtest/main.py", line 531 in main
2018-07-05T12:11:22.2971440Z   File "/opt/vsts/work/1/s/Lib/test/libregrtest/main.py", line 584 in main
2018-07-05T12:11:22.2985417Z   File "/opt/vsts/work/1/s/Lib/test/__main__.py", line 2 in <module>
2018-07-05T12:11:22.3002269Z   File "/opt/vsts/work/1/s/venv/lib/python3.8/site-packages/coverage/execfile.py", line 184 in run_python_file
2018-07-05T12:11:22.3017503Z   File "/opt/vsts/work/1/s/venv/lib/python3.8/site-packages/coverage/execfile.py", line 114 in run_python_module
2018-07-05T12:11:22.3035688Z   File "/opt/vsts/work/1/s/venv/lib/python3.8/site-packages/coverage/cmdline.py", line 624 in do_run
2018-07-05T12:11:22.3051283Z   File "/opt/vsts/work/1/s/venv/lib/python3.8/site-packages/coverage/cmdline.py", line 488 in command_line
2018-07-05T12:11:22.3067258Z   File "/opt/vsts/work/1/s/venv/lib/python3.8/site-packages/coverage/cmdline.py", line 753 in main
2018-07-05T12:11:22.3083839Z   File "/opt/vsts/work/1/s/venv/lib/python3.8/site-packages/coverage/__main__.py", line 8 in <module>
2018-07-05T12:11:22.3099563Z   File "/opt/vsts/work/1/s/Lib/runpy.py", line 85 in _run_code
2018-07-05T12:11:22.3113337Z   File "/opt/vsts/work/1/s/Lib/runpy.py", line 193 in _run_module_as_main
2018-07-05T12:11:22.4058762Z Aborted (core dumped)
2018-07-05T12:11:22.4252037Z ##[error]Bash exited with code '134'.
2018-07-05T12:11:22.5073689Z ##[section]Finishing: Tests with coverage


It is not related to changes made in PR 8071.

Is Coverage.py doing something wrong or just exposes a flaw in the interpreter?

----------
components: Interpreter Core
messages: 321261
nosy: nedbat, serhiy.storchaka, vstinner
priority: normal
severity: normal
status: open
title: Assertion failure in _PyType_Lookup
type: crash
versions: Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34068>
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