Constant CUDA_ERROR_DEINITIALIZED 

pub const CUDA_ERROR_DEINITIALIZED: i32 = 4;

CUDA_ERROR_DEINITIALIZED. The driver tears the primary context down in its own atexit handler, which can run before our Drop impls do. Every module unload and every host free then reports this code.

It is not a failure: a module cannot leak out of a context that no longer exists, and the memory it occupied went with it. Reporting 158 of them at exit is pure noise that buries anything real.