Git Repository Tests are hanging on the Windows CI job

Is it reproducible with SwiftPM command-line tools: swift build, swift test, swift package etc?

• Confirmed reproduction steps with SwiftPM CLI. The description text must include reproduction steps with either of command-line SwiftPM commands, swift build, swift test, swift package etc.

Description

We saw this with an attempt last year to parallelize the git checkouts SwiftPM does at the beginning of the resolve step. It has hit again when we parallelized the Git repository tests in Windows CI in the build-using-self script.

Running the tests in parallel greatly improve the CI run times. So for now, I have turned off those tests in Windows when running the build-using-self scripts, but we do need to bring them back.

Two options, find out why it's happening. Which seems so far to only happen in the CI job. All attempt to reproduce locally have failed.

Or we need to find a way to serialize these tests, ensuing only one git operation is running at a time.

I'd prefer the former but it's going to be difficult unless we can reproduce locally so we can debug it or at least quickly try workarounds.

Expected behavior

No response

Actual behavior

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Steps to reproduce

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Swift Package Manager version/commit hash

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Swift & OS version (output of swift --version ; uname -a)

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Start with the Windows CI build-using-self script and the Git repository tests that were parallelized. Run the relevant SwiftPM CLI tests in the Windows CI environment and compare them with local runs; done means identifying the hang and restoring the tests to parallel execution, or defining a reliable serialized path.