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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"pixi run test fails on main: CUDA 13.2 pin lags 13.3 bindings + cython-test .so misplacement","articleBody":"## Summary\n\n`pixi run test` (env `cu13`) does not complete from a clean checkout on `main`. Two independent root causes:\n\n1. **CUDA version pin lag.** The bindings were regenerated against CUDA 13.3.0 (#2139), adding NVRTC symbols (`NVRTC_ERROR_BUSY`, `nvrtcBundledHeadersInfo`, `nvrtcGetBundledHeadersInfo`), but the pixi `cuda-version` pins stayed at `13.2.*` in `cuda_bindings/pixi.toml` and `cuda_core/pixi.toml`. The local build then compiles 13.3-referencing Cython code against a 13.2 `nvrtc.h`:\n   ```\n   'nvrtcBundledHeadersInfo' was not declared in this scope\n   ```\n   CI was unaffected because it builds wheels from `ci/versions.yml` (13.3.0), not via `pixi run test`.\n\n2. **Cython-test `.so` placement.** `tests/cython/build_tests.py` runs `build_ext --inplace`, which writes the `.so` relative to cwd; pixi runs the task from the project root, so the `.so` lands in the package root instead of `tests/cython/`, where pytest imports it by bare module name. Latent since #1978 — a stale, correctly-placed `.so` masked it. A clean checkout fails with `ModuleNotFoundError`.\n\n## Fix\n\nPR #2180 — bumps the `cuda-version` pins to `13.3.*` and `chdir`s before `build_ext --inplace` in both `build_tests.py`.\n\n## Notes\n\nThere were also two local-only stale-artifact symptoms while bisecting (stale pyclibrary parser caches `cache_driver`/`cache_runtime`, and a stale compiled `.so`) that don't exist on a clean checkout — captured in the follow-up issue on drift prevention.\n\n🤖 Filed with [Claude Code](https://claude.com/claude-code)","author":{"url":"https://github.com/rparolin","@type":"Person","name":"rparolin"},"datePublished":"2026-06-09T06:50:08Z","url":"https://github.com/NVIDIA/cuda-python/issues/2182"}