test_pty.test_openpty() failed on x86 Gentoo Installed with X 3.x: unexpected success

[vstinner]

BPO	42463
Nosy	@vstinner

^{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 2020-11-27.13:49:25.750>
created_at = <Date 2020-11-25.15:27:02.522>
labels = ['tests', '3.10']
title = 'test_pty.test_openpty() failed on x86 Gentoo Installed with X 3.x: unexpected success'
updated_at = <Date 2020-11-27.13:49:25.749>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2020-11-27.13:49:25.749>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2020-11-27.13:49:25.750>
closer = 'vstinner'
components = ['Tests']
creation = <Date 2020-11-25.15:27:02.522>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 42463
keywords = []
message_count = 4.0
messages = ['381837', '381838', '381841', '381949']
nosy_count = 1.0
nosy_names = ['vstinner']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue42463'
versions = ['Python 3.10']

[vstinner]

x86 Gentoo Installed with X 3.x:
https://buildbot.python.org/all/#/builders/464/builds/445

0:05:51 load avg: 4.73 [104/425/1] test_pty failed -- running: test_unparse (1 min 3 sec)

test_fork (test.test_pty.PtyTest) ... calling pty.fork()
Waiting for child (3734) to finish.
Child (3734) exited with code 4 (status 1024).
ok

test_master_read (test.test_pty.PtyTest) ... Calling pty.openpty()
Got master_fd '3', slave_fd '4'
Closing slave_fd
Reading from master_fd
ok

test_openpty (test.test_pty.PtyTest) ... Setting pty.STDIN_FILENO window size
Calling pty.openpty()
Got master_fd '3', slave_fd '4'
Writing to slave_fd
Writing chunked output
unexpected success

test__copy_eof_on_all (test.test_pty.SmallPtyTests)
Test the empty read EOF case on both master_fd and stdin. ... ok

test__copy_to_each (test.test_pty.SmallPtyTests)
Test the normal data case on both master_fd and stdin. ... ok

----------------------------------------------------------------------

Ran 5 tests in 0.054s

FAILED (unexpected successes=1)
test test_pty failed

[vstinner]

Same issue on x86 Gentoo Non-Debug with X 3.x:
https://buildbot.python.org/all/#builders/58/builds/442

[vstinner]

Regression related to bpo-41818:
c13d899

[vstinner]

https://buildbot.python.org/all/#/builders/464 is back to green.