Windows 10 buildbot: test__xxsubinterpreters.test_already_running() fails randomly

[vstinner]

BPO	33356
Nosy	@vstinner, @ericsnowcurrently, @pablogsal

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-10-14.21:23:30.694>
created_at = <Date 2018-04-25.14:26:40.576>
labels = ['3.8', 'tests']
title = 'Windows 10 buildbot: test__xxsubinterpreters.test_already_running() fails randomly'
updated_at = <Date 2019-10-14.21:23:30.693>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2019-10-14.21:23:30.693>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2019-10-14.21:23:30.694>
closer = 'vstinner'
components = ['Tests']
creation = <Date 2018-04-25.14:26:40.576>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 33356
keywords = []
message_count = 5.0
messages = ['315737', '318097', '338973', '339157', '354657']
nosy_count = 3.0
nosy_names = ['vstinner', 'eric.snow', 'pablogsal']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue33356'
versions = ['Python 3.8']

[vstinner]

Windows10 3.x: test_already_running() failed once, but passed when run again:

http://buildbot.python.org/all/#/builders/3/builds/817/steps/3/logs/stdio

======================================================================
FAIL: test_already_running (test.test__xxsubinterpreters.RunStringTests)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "D:\buildarea\3.x.bolen-windows10\build\lib\test\test__xxsubinterpreters.py", line 561, in test_already_running
    interpreters.run_string(self.id, 'print("spam")')
AssertionError: RuntimeError not raised

(...)
Re-running test 'test__xxsubinterpreters' in verbose mode
(...)
Ran 94 tests in 14.582s
OK (skipped=3)

[vstinner]

I didn't see this failure recently, I close the bug.

[vstinner]

The bug is still here. It looks like a race condition triggered on very slow buildbot like AMD64 FreeBSD 10-STABLE Non-Debug 3.x:

https://buildbot.python.org/all/#/builders/167/builds/728

0:18:13 load avg: 4.84 [405/420/1] test__xxsubinterpreters failed -- running: test_tools (6 min 1 sec)
spam
test_bad_id (test.test__xxsubinterpreters.ChannelIDTests) ... ok
(...)
test_initial (test.test__xxsubinterpreters.ListAllTests) ... ok
test_SystemExit (test.test__xxsubinterpreters.RunStringTests) ... ok
test_already_running (test.test__xxsubinterpreters.RunStringTests) ... FAIL
test_bad_id (test.test__xxsubinterpreters.RunStringTests) ... Exception in thread Thread-9:
Traceback (most recent call last):
  File "/usr/home/buildbot/python/3.x.koobs-freebsd10.nondebug/build/Lib/threading.py", line 917, in _bootstrap_inner
    self.run()
  File "/usr/home/buildbot/python/3.x.koobs-freebsd10.nondebug/build/Lib/threading.py", line 865, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/home/buildbot/python/3.x.koobs-freebsd10.nondebug/build/Lib/test/test__xxsubinterpreters.py", line 51, in run
    interpreters.run_string(interp, dedent(f"""
RuntimeError: interpreter already running

ok
test_bad_script (test.test__xxsubinterpreters.RunStringTests) ... ok
test_bytes_for_script (test.test__xxsubinterpreters.RunStringTests) ... ok
(...)

======================================================================
FAIL: test_already_running (test.test__xxsubinterpreters.RunStringTests)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/usr/home/buildbot/python/3.x.koobs-freebsd10.nondebug/build/Lib/test/test__xxsubinterpreters.py", line 855, in test_already_running
    interpreters.run_string(self.id, 'print("spam")')
AssertionError: RuntimeError not raised

---

Ran 112 tests in 12.936s

FAILED (failures=1, skipped=5)
test test__xxsubinterpreters failed
(...)
Re-running test 'test__xxsubinterpreters' in verbose mode
(...)
Ran 112 tests in 3.058s
OK (skipped=5)

[ericsnowcurrently]

I'll take a look when I get a chance.

[vstinner]

I close this issue as a duplicate of bpo-37224.