Stefan Behnel added the comment: Agreed that it's not a bug in CPython, but my guess is that it's not a bug in NumPy either. The C function you call (which IIRC creates a new NumPy array) almost certainly needs the GIL to protect it against race conditions, and since you mentioned OpenMP, you most likely released the GIL. So, just re-acquire the GIL around the call (and make sure you don't have any other threading problems in your code).
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