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[3.15] gh-159739: Keep text I/O state valid across reentrant callbacks (GH-160398) - #160623
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…pythonGH-160398) A raw read can reinitialize a TextIOWrapper as write-only, and codec callbacks or finalizers can release an encoder, decoder, or decoded chunk while a read or write still needs it. This can crash the interpreter. Check that a decoder is still available after reading, keep codecs alive across calls, and read the chunk length before transferring ownership. Also recheck StringIO after converting the truncate size because __index__() can close the stream. (cherry picked from commit 665bda9) Co-authored-by: Jelle Zijlstra <jelle@openai.com>
This was referenced Oct 24, 2026
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A raw read can reinitialize a TextIOWrapper as write-only, and codec callbacks or finalizers can release an encoder, decoder, or decoded chunk while a read or write still needs it. This can crash the interpreter. Check that a decoder is still available after reading, keep codecs alive across calls, and read the chunk length before transferring ownership. Also recheck StringIO after converting the truncate size because index() can close the stream.
(cherry picked from commit 665bda9)
Co-authored-by: Jelle Zijlstra jelle@openai.com