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Title: gh-151814: Add test for TextIOWrapper.write unbounded memory growth from repeated writes by cmaloney · Pull Request #152244 · python/cpython · GitHub

Open Graph Title: gh-151814: Add test for TextIOWrapper.write unbounded memory growth from repeated writes by cmaloney · Pull Request #152244 · python/cpython

X Title: gh-151814: Add test for TextIOWrapper.write unbounded memory growth from repeated writes by cmaloney · Pull Request #152244 · python/cpython

Description: Use tracemalloc to measure memory usage. Fails before GH-151817, passes after. Validated by changing condition between > 0 and >= 0 and rebuilding + running make && ./python -m test test_io.test_textio -m "test_write_empty_no_memory_growth". cpython/Modules/_io/textio.c Line 1823 in 908f438 if (bytes_len > 0) { Inspired by the report memory usage helper in GH-152203 (If it gets more use should probably move to test.support). cc: @StanFromIreland Issue: gh-151814

Open Graph Description: Use tracemalloc to measure memory usage. Fails before GH-151817, passes after. Validated by changing condition between > 0 and >= 0 and rebuilding + running make && ./python -m test t...

X Description: Use tracemalloc to measure memory usage. Fails before GH-151817, passes after. Validated by changing condition between > 0 and >= 0 and rebuilding + running make && ./...

Opengraph URL: https://github.com/python/cpython/pull/152244

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69a524e gh-151814: Add test for TextIOWrapper.write unbounded memory growth f… cmaloney Jun 26, 2026 https://github.com/python/cpython/pull/152244/commits/69a524e999a73342245e6d2646cc68336c2cd170
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