Memory leak on macOS #773
Description
The readline module included with UV python builds leaks memory, resulting in unexpected behavior for all inheriting packages (including Pytest most notably).
To reproduce, create a uv venv on macOS with python versions 3.10, 3.11, 3.12, or 3.13. Then, run a leak checker on import readline
> sudo leaks --atExit -- python -c "import readline" | grep bytes Process 5364: 1 leak for 16 total leaked bytes. 1 (16 bytes) ROOT LEAK: <non-object from libedit.3.dylib 0x149805d80> [16]Running the (roughly) equivalent command on linux appears not to leak memory:
> valgrind --leak-check=full python -c "import readline" ==2484992== LEAK SUMMARY: ==2484992== definitely lost: 0 bytes in 0 blocks ==2484992== indirectly lost: 0 bytes in 0 blocks ==2484992== possibly lost: 0 bytes in 0 blocks ==2484992== still reachable: 500,336 bytes in 199 blocks ==2484992== suppressed: 0 bytes in 0 blocksThis only seems to be the case in UV python distros - I can confirm that homebrew python versions do not leak memory.
See pytest-dev/pytest#13636 for the original reference.