[AIX] test_io: files was modified by test_io: (@test_6488748_tmpæ) on POWER6 AIX 3.9

[vstinner]

BPO	41717
Nosy	@vstinner, @skrah, @isidentical
Superseder	bpo-41401: Using non-ascii that require UTF-8 breaks AIX testing

^{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 2020-09-05.13:26:54.788>
created_at = <Date 2020-09-04.15:13:58.809>
labels = ['tests', '3.9']
title = '[AIX] test_io: files was modified by test_io: (@test_6488748_tmp\xc3\xa6) on POWER6 AIX 3.9'
updated_at = <Date 2020-09-05.13:26:54.786>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2020-09-05.13:26:54.786>
actor = 'skrah'
assignee = 'none'
closed = True
closed_date = <Date 2020-09-05.13:26:54.788>
closer = 'skrah'
components = ['Tests']
creation = <Date 2020-09-04.15:13:58.809>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 41717
keywords = []
message_count = 5.0
messages = ['376371', '376381', '376382', '376386', '376430']
nosy_count = 4.0
nosy_names = ['vstinner', 'skrah', 'David.Edelsohn', 'BTaskaya']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '41401'
type = None
url = 'https://bugs.python.org/issue41717'
versions = ['Python 3.9']

[vstinner]

'@test_6488748_tmpæ' is likely TESTFN_NONASCII which is exposed as test.support.os_helper.TESTFN, but test_io has many many tests using TESTFN.

https://buildbot.python.org/all/#/builders/330/builds/20

0:06:47 [130/425/1] test_io failed (env changed) (1 min 8 sec) -- running: test_concurrent_futures (31.1 sec)
(...)
Warning -- files was modified by test_io
Before: []
After: ['@test_6488748_tmpæ']

Since build 1, 19 days ago:
https://buildbot.python.org/all/#/builders/330/builds/1

If someone is able to reproduce the issue, please attempt to identify which test method leaks the temporary file using the command:

./python -m test.bisect_cmd test_io --fail-env-changed -v

After 10-20 minutes, the command should give the name of a single method which creates the temporary file.

[DavidEdelsohn]

Bisection failed after 101 iterations and 0:20:29

[vstinner]

Bisection failed after 101 iterations and 0:20:29

Oh :-( Does "./python -m test test_io --fail-env-changed -v" fail?

[DavidEdelsohn]

It's the same system. It doesn't fail alone. Didn't we both previously see issues with the interaction of tests due to the other of tests, that previous tests left things in the environment that affected later tests?

[skrah]

I think this is a duplicate of bpo-41401.