utils: If shell.run_parallel is not called before run.shell(), then the lock is not yet initialized #6789
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lock is not initialized. Thus, we initialize the lock to None and just don't use it because no console output can happen in parallel because we're not running in parallel.
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@swift-ci Please smoke test and merge |
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Actually, the smoke test checkout might fail on linux without this patch... |
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Somehow, the update-checkout parallelize patch got into 3.1 without the patch that fixes it.
See #6768.