test_embed.StdPrinterTests() crash if stdout FD is not 1 or 2

[vstinner]

BPO	45453
Nosy	@vstinner, @miss-islington
PRs	bpo-45453: Fix test_embed.StdPrinterTests #28916 [3.10] bpo-45453: Fix test_embed.StdPrinterTests (GH-28916) #28917

^{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 2021-10-13.10:25:40.555>
created_at = <Date 2021-10-13.01:52:49.617>
labels = ['tests', '3.10', '3.11']
title = 'test_embed.StdPrinterTests() crash if stdout FD is not 1 or 2'
updated_at = <Date 2021-10-13.10:25:40.555>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2021-10-13.10:25:40.555>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2021-10-13.10:25:40.555>
closer = 'vstinner'
components = ['Tests']
creation = <Date 2021-10-13.01:52:49.617>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 45453
keywords = ['patch']
message_count = 6.0
messages = ['403779', '403783', '403784', '403788', '403791', '403817']
nosy_count = 2.0
nosy_names = ['vstinner', 'miss-islington']
pr_nums = ['28916', '28917']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue45453'
versions = ['Python 3.10', 'Python 3.11']

[vstinner]

test_embed does crash randomly on AMD64 Fedora Rawhide Clang 3.x:

• https://buildbot.python.org/all/#/builders/188/builds/880
• https://buildbot.python.org/all/#/builders/188/builds/879

So far, I failed to reproduce the issue.

[vstinner]

It also crashed on the Address Sanitizer job of GitHub Action:
https://github.com/python/cpython/runs/3877327574

0:09:15 load avg: 4.46 [267/413/1] test_embed crashed (Exit code -11) -- running: test_gdb (1 min 2 sec), test_peg_generator (57.4 sec)

== Tests result: FAILURE then SUCCESS ==

1 re-run test:
test_embed

[vstinner]

Oh, maybe this is no traceback on a crash because of my recent libregrtest changes in bpo-45410.

[vstinner]

Ah, I reproduced a crash locally:

0:00:19 load avg: 2.00 [3/3/1] test_embed crashed (Exit code -11)
Fatal Python error: Segmentation fault

Current thread 0x00007fef0ea9f2c0 (most recent call first):
File "/home/vstinner/python/main/Lib/test/test_embed.py", line 1560 in create_printer
File "/home/vstinner/python/main/Lib/test/test_embed.py", line 1595 in test_disallow_instantiation

The crash happens when sys.__stdout__.fileno() is not 1 or 2. It happens with my recents changes in bpo-45410.

[vstinner]

New changeset 678433f by Victor Stinner in branch 'main':
bpo-45453: Fix test_embed.StdPrinterTests (GH-28916)
678433f

[vstinner]

New changeset 7e74d99 by Miss Islington (bot) in branch '3.10':
bpo-45453: Fix test_embed.StdPrinterTests (GH-28916) (GH-28917)
7e74d99