BUG: fix memory leak in np.zeros when fill-zero loop raises (#31320)#31357
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BUG: fix memory leak in np.zeros when fill-zero loop raises
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Backport of #31320.
BUG: fix memory leak in np.zeros when fill-zero loop raises
PR summary
This PR fixes a memory leak in np.zeros that occurs when the fill-zero loop raises an exception (which can happen for custom user-defined dtypes). It does this by setting NPY_ARRAY_OWNDATA earlier to ensure the data will be deallocated, combined with changes to mem_handler cleanup to avoid a double-decref.
I'm not entirely sure whether this is the most appropriate way to fix the leak, but it does seem to work correctly based on testing with
tracemalloc.AI Disclosure
The bug was detected through testing with
tracemalloc, then located and fixed by Claude Opus 4.7.Full AI-generated description: https://gist.github.com/MaartenBaert/f3eadd280f84ef6896586025f59788ec