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Ran 09 Jun 2026 12:31PM UTC

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Build # 1561

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push

buildkite

Committed by

web-flow

Commit Message

`@cfunction`: Strengthen atomic ordering slightly (#62010)

This strengthening seems to be required on weakly-ordered memory
architectures, since otherwise it is technically possible for theFptr to
observe a store from one publish event even though last_world and
jl_world_counter both observed the stores from a strictly previous one.

If that happens, it's a soundness gap since it can mean invoking a
CodeInstance in a world it was not compiled for. I expect this is
unlikely to be an issue in practice, but it's good to tighten up anyway.

Found by human inspection and then discussed / explored with Claude 🤖

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