regrtest can fail writing unencodable test description or status

Bug report

I already fixed errors related to non-ASCII skip messages (by using ascii() instead of str() or repr()). There may be other non-ASCII skip messages left, but they are not raised on buildbots with non-UTF-8 stdout. In any case, this only fixed CPython tests, user tests can have the same issues.

#135121 exposed a new issue -- subtest description which includes non-ASCII parameter values. It is more difficult, because we have no control on formatting them. Always using ascii() instead of repr() will harm readability on normal platforms.

Linked PRs

The following tests passes in unittest and in libregrtest with a single process, but fails in libregrtest with multiple processes.

import unittest
class TestNonASCII(unittest.TestCase):
    def test_docstring(self):
        """\u20ac"""
    def test_subtest(self):
        with self.subTest(param='\u20ac'):
            pass
    def test_skip(self):
        self.skipTest('\u20ac')

When run with unittest, the output stream is stderr with the backslashreplace error handler. In libregrtest with a single process, the output stream is stdout with the backslashreplace error handler, but in multi-process mode -- with the strict error handler.

@vstinner

cc @vstinner

pythongh-135124: Change stdout errors in regrtest worker process

I proposed #135138 to fix the issue.

gh-135124: Change stdout errors in regrtest worker process (#135138)

pythongh-135124: Change stdout errors in regrtest worker process (pyt…

[3.14] gh-135124: Change stdout errors in regrtest worker process (GH…

[3.13] gh-135124: Change stdout errors in regrtest worker process (GH…

pythongh-135124: Change stdout errors in regrtest worker process (pyt…

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regrtest can fail writing unencodable test description or status #135124

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regrtest can fail writing unencodable test description or status #135124

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serhiy-storchaka commented on Jun 4, 2025

serhiy-storchaka commented on Jun 4, 2025

vstinner commented on Jun 4, 2025

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