[pull] main from python:main#969
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pull[bot] merged 3 commits intotj-python:mainfrom Apr 18, 2026
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…ects (GH-148698) Forbid marshalling recursive code, slice and frozendict objects which cannot be correctly unmarshalled. Reject invalid marshal data produced by marshalling recursive frozendict objects which was previously incorrectly unmarshalled. Add multiple tests for recursive data structures.
Co-authored-by: Stan Ulbrych <stan@python.org>
If _BlocksOutputBuffer_Finish() fails (memory allocation failure), PyBytesWriter_Discard() is called on the writer. Then if _BlocksOutputBuffer_OnError() is called, it calls again PyBytesWriter_Discard() causing a double free. Fix _BlocksOutputBuffer_Finish() by setting buffer->writer to NULL, so _BlocksOutputBuffer_OnError() does nothing instead of calling PyBytesWriter_Discard() again.
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