> At least some errors probably come from the file
> 
> sage/algebras/quatalg/quaternion_algebra_cython.pyx
> 
> and I think they should be easily fixable without any knowledge of what
> is going on by just changing the code to make a copy of the zero matrix.
> 
> However, I really wonder whether this fix is necessary. I understand the
> the bug pointed out is a bad bug, but I think that when I call
> zero_matrix() I will usually quickly modify the returned matrix. Are
> there many useful situations where it is important that M =
> zero_matrix() return very fast and where we _aren't_ going to modify M?

Please see the former discussion about #8276. 

Cheers,

Florent

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