Description
On my Win10 the test suite completes when run serially. But with main and 3.11, but not 3.10, it quits too soon with -j0. This has occured with both repository debug builds and installed 3.11.0b4. Failure is currently deterministic with variable details. Presence of -ugui or -uall has no apparent effect.
What happens is that roughly about 100 tests before the end, a 'regrtest worker thread' fails ('warning') with UnicodeDecodeError: 'utf-8' codec can't decode byte 0x91 in position <variable>: invalid start byte. The 14 worker processes are stopped and the usual summary is given, but with an additional list of ' tests omitted <list of test names'. The test is called a 'SUCCESS'. This is followed by a traceback for SystemExit(0), followed by 1 or more tracebacks for PermissionError because a temporary test file is supposedly used by another process.
Attaching a file with output starting with the initial warning fails. Will paste separately.
If this is not limited to my system, I think it should be a release blocker.
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