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bazel_bootstrap_distfile_test failing in postsubmit on Windows

See original GitHub issue

The test //src/test/shell/bazel:bazel_bootstrap_distfile_test has started to fail in our postsubmit pipeline on Windows only.

Here’s a list of broken jobs:

I have not seen it happen before job 14736, so this might be the culprit. 🤔 I’m not aware of any CI infrastructure or Windows image changes in the last days.

Here’s an example log: https://storage.googleapis.com/bazel-untrusted-buildkite-artifacts/745cad19-516a-479b-8084-9154bf14c893/src\test\shell\bazel\bazel_bootstrap_distfile_test\attempt_1.log

The relevant error message seems to be:

[1A[K[31m[1mERROR: [0mAnalysis of target '//src:bazel_nojdk.exe' failed; build aborted: invalid registered execution platform '//:default_host_platform': no such target '//:default_host_platform': target 'default_host_platform' not declared in package '' defined by C:/b/iwgf237n/execroot/io_bazel/_tmp/a6b4c571d5cd258ae95c5906c6c25060/bazelbootstrap.iIshY86j/BUILD

When the test fails during a job, it will consistently fail during all attempts, always with the same error message. It is thus not a typically flaky test which fails with a random chance.