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Read and write of __class__ in two threads causes crash #120198

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Crash report

What happened?

See #120195 for crashing CI.
Apply diff from there and run

python -m test test_free_threading -m test_type

CPython versions tested on:

CPython main branch

Operating systems tested on:

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Output from running 'python -VV' on the command line:

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    type-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump
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