test_spawn_doesnt_hang (test.test_pty.PtyTest) fails when stdin isn't readable

[kanavin]

BPO	45223
Nosy	@kanavin
PRs	bpo-45223: Lib/pty.py: handle stdin I/O errors same way as master I/O errors #28388

^{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 = None
created_at = <Date 2021-09-16.15:38:35.345>
labels = []
title = "test_spawn_doesnt_hang (test.test_pty.PtyTest) fails when stdin isn't readable"
updated_at = <Date 2021-09-16.15:39:19.258>
user = 'https://github.com/kanavin'

bugs.python.org fields:

activity = <Date 2021-09-16.15:39:19.258>
actor = 'python-dev'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = []
creation = <Date 2021-09-16.15:38:35.345>
creator = 'Alexander Kanavin'
dependencies = []
files = []
hgrepos = []
issue_num = 45223
keywords = ['patch']
message_count = 1.0
messages = ['401961']
nosy_count = 2.0
nosy_names = ['python-dev', 'Alexander Kanavin']
pr_nums = ['28388']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue45223'
versions = []

[kanavin]

I am observing the following under yocto's test harness:
======================================================================
ERROR: test_spawn_doesnt_hang (test.test_pty.PtyTest)
----------------------------------------------------------------------

    Traceback (most recent call last):
      File "/usr/lib/python3.10/test/test_pty.py", line 316, in test_spawn_doesnt_hang
        pty.spawn([sys.executable, '-c', 'print("hi there")'])
      File "/usr/lib/python3.10/pty.py", line 181, in spawn
        _copy(master_fd, master_read, stdin_read)
      File "/usr/lib/python3.10/pty.py", line 157, in _copy
        data = stdin_read(STDIN_FILENO)
      File "/usr/lib/python3.10/pty.py", line 132, in _read
        return os.read(fd, 1024)
    OSError: [Errno 5] Input/output error

The same tests runs fine in a regular console.