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tokio/file-io test is non-deterministic #4367

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@RalfJung

./miri run --dep tests/pass-dep/tokio/file-io.rs -Zmiri-disable-isolation -Zmiri-many-seeds fails on seed 40 for me. Overall, around 90% of seeds seem to fail. No idea why this did not explode earlier, maybe the distribution changed recently.

tests/pass-dep/tokio/file-io.rs has failed on rustc CI; it seems to be non-deterministic. I haven't yet been able to reproduce this locally. (The reproducer I had before was completely bogus.)

@tiif can you look into this? This is causing issues for rustc CI so it is somewhat urgent.

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    A-testsArea: affects our test suite or CIC-bugCategory: This is a bug.

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