test__xxsubinterpreters leaked references and memory blocks

[pablogsal]

BPO	36447
Nosy	@vstinner, @ericsnowcurrently, @pablogsal
PRs	bpo-36447: Fix refleak in sysmodule.c when calling SET_SYS_FROM_STRING_BORROW #12586

^{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 2019-03-27.12:44:16.411>
created_at = <Date 2019-03-27.10:00:53.114>
labels = ['interpreter-core', '3.8', 'tests', 'performance']
title = 'test__xxsubinterpreters leaked references and memory blocks'
updated_at = <Date 2019-03-27.13:00:37.325>
user = 'https://github.com/pablogsal'

bugs.python.org fields:

activity = <Date 2019-03-27.13:00:37.325>
actor = 'ZackerySpytz'
assignee = 'none'
closed = True
closed_date = <Date 2019-03-27.12:44:16.411>
closer = 'vstinner'
components = ['Interpreter Core', 'Tests']
creation = <Date 2019-03-27.10:00:53.114>
creator = 'pablogsal'
dependencies = []
files = []
hgrepos = []
issue_num = 36447
keywords = ['patch']
message_count = 3.0
messages = ['338949', '338951', '338957']
nosy_count = 3.0
nosy_names = ['vstinner', 'eric.snow', 'pablogsal']
pr_nums = ['12586']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'resource usage'
url = 'https://bugs.python.org/issue36447'
versions = ['Python 3.8']

[pablogsal]

The buildbot x86 Gentoo Refleaks 3.x/546 had detected that test__xxxsubinterpreters is leaking references and blocks:

test__xxsubinterpreters leaked [138, 138, 138] references, sum=414
test__xxsubinterpreters leaked [69, 69, 69] memory blocks, sum=207
4 tests failed again:
test__xxsubinterpreters test_atexit test_capi test_threading

https://buildbot.python.org/all/#/builders/1/builds/546

[pablogsal]

Bisecting shows that:

8b9dbc0 is the first bad commit
commit 8b9dbc0
Author: Victor Stinner <vstinner@redhat.com>
Date: Wed Mar 27 01:36:16 2019 +0100

bpo-36444: Remove _PyMainInterpreterConfig (GH-12571)

[vstinner]

New changeset 34ef64f by Victor Stinner (Pablo Galindo) in branch 'master':
bpo-36447, bpo-36447: Fix refleak in _PySys_InitMain() (GH-12586)
34ef64f