Friends, there is a rather difficult-to-track-down issue so far only reported by one user - afaik.
See: rgb curve module crashes darktable on second curve controll point · Issue #15358 · darktable-org/darktable · GitHub
Enforce struct aligning in rgbcurve by jenshannoschwalm · Pull Request #15742 · darktable-org/darktable · GitHub
Con someone else confirm that issue on the same CPU? Any issue on the non-3D version with less cache?