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gh-152767: Fix a data race in multibytecodec#153000

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ByteFlowing1337:fix-152767
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gh-152767: Fix a data race in multibytecodec#153000
ByteFlowing1337 wants to merge 1 commit into
python:mainfrom
ByteFlowing1337:fix-152767

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@ByteFlowing1337

@ByteFlowing1337 ByteFlowing1337 commented Jul 4, 2026

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Since it's a rare data race and a minor fix, I think a news entry is not needed.

@ByteFlowing1337 ByteFlowing1337 requested a review from corona10 as a code owner July 4, 2026 06:54
@ByteFlowing1337 ByteFlowing1337 changed the title gh-152767: Atomicize decref-then-assign op in codecctx_errors_set gh-152767: Fix a data race in multibytecodec Jul 4, 2026
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@corona10 Do you mind reviewing this PR?
It's a minor fix - I've confirmed it eliminates the TSan reports from the reproducer in the issue.

@corona10 corona10 self-assigned this Jul 5, 2026
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