test_timeout fails with "ENV CHANGED"

[mcepl]

Bug report

Bug description:

When upgrading python 3.13 for openSUSE it suddenly fails with == Tests result: ENV CHANGED then ENV CHANGED == Despite the error, I have not been able to collect any more reasonable error message in our build log (not even which environmental variable was changed):

[  807s] 0:01:44 load avg: 10.27 Re-running 1 failed tests in verbose mode in subprocesses
[  807s] 0:01:44 load avg: 10.27 Run 1 test in parallel using 1 worker process (timeout: 1 hour 30 min, worker timeout: 1 hour 35 min)
[  808s] 0:01:46 load avg: 9.53 [1/1/1] test_timeout failed (env changed)
[  808s] Re-running test_timeout in verbose mode (matching: )
[  808s] testBlockingThenTimeout (test.test_timeout.CreationTestCase.testBlockingThenTimeout) ... ok
[  808s] testFloatReturnValue (test.test_timeout.CreationTestCase.testFloatReturnValue) ... ok
[  808s] testObjectCreation (test.test_timeout.CreationTestCase.testObjectCreation) ... ok
[  808s] testRangeCheck (test.test_timeout.CreationTestCase.testRangeCheck) ... ok
[  808s] testReturnType (test.test_timeout.CreationTestCase.testReturnType) ... ok
[  808s] testTimeoutThenBlocking (test.test_timeout.CreationTestCase.testTimeoutThenBlocking) ... ok
[  808s] testTypeCheck (test.test_timeout.CreationTestCase.testTypeCheck) ... ok
[  808s] testAcceptTimeout (test.test_timeout.TCPTimeoutTestCase.testAcceptTimeout) ... skipped "Resource 'www.python.org.' is not available"
[  808s] testConnectTimeout (test.test_timeout.TCPTimeoutTestCase.testConnectTimeout) ... skipped "Resource 'www.python.org.' is not available"
[  808s] testRecvTimeout (test.test_timeout.TCPTimeoutTestCase.testRecvTimeout) ... skipped "Resource 'www.python.org.' is not available"
[  808s] testSend (test.test_timeout.TCPTimeoutTestCase.testSend) ... skipped "Resource 'www.python.org.' is not available"
[  808s] testSendall (test.test_timeout.TCPTimeoutTestCase.testSendall) ... skipped "Resource 'www.python.org.' is not available"
[  808s] testSendto (test.test_timeout.TCPTimeoutTestCase.testSendto) ... skipped "Resource 'www.python.org.' is not available"
[  808s] testRecvfromTimeout (test.test_timeout.UDPTimeoutTestCase.testRecvfromTimeout) ... ok

CPython versions tested on:

3.13

Operating systems tested on:

Linux

Linked PRs

• gh-132535: Fix resource warnings in test_timeout #132572
• [3.13] gh-132535: Fix resource warnings in test_timeout (GH-132572) #132580

[serhiy-storchaka]

It can be reproduced if internet connection is disabled. This leads to leaking open sockets. When run Python with the -Werror option, resource warnings are converted to unhandled errors, and this was caught by the test runner. #132572 fixes this.

Error reporting is confusing, but this is a different issue. cc @vstinner

[mcepl]

Yes, #132572 helped. Thank you.

[serhiy-storchaka]

Opened #132581 for better error reporting.