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Title: [3.13] gh-120198: Stop the world when setting __class__ on free-threaded build by Fidget-Spinner · Pull Request #121591 · python/cpython · GitHub

Open Graph Title: [3.13] gh-120198: Stop the world when setting __class__ on free-threaded build by Fidget-Spinner · Pull Request #121591 · python/cpython

X Title: [3.13] gh-120198: Stop the world when setting __class__ on free-threaded build by Fidget-Spinner · Pull Request #121591 · python/cpython

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Open Graph Description: (cherry-picked from commit 3bfc9c8) Issue: Read and write of __class__ in two threads causes crash #120198

X Description: (cherry-picked from commit 3bfc9c8) Issue: Read and write of __class__ in two threads causes crash #120198

Opengraph URL: https://github.com/python/cpython/pull/121591

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