Weeble added the comment:

I had a closer look at the cif object in gdb. The ffi_type of the argument in 
question has size 16, alignment 1, type FFI_TYPE_STRUCT and elements contains a 
single nested ffi_type, of size 8, alignment 8, type FFI_TYPE_POINTER.

I think this pointer type is wrong. The struct should indeed be size 16, but 
its contents (in this case) should be 16 bytes of uint8s, rather than a single 
pointer. I'm not certain how to correctly describe an array to libffi. While 
you might be able to hack it with a nested struct filled with 16 individual 
integers, I have no idea if that would work consistently across platforms.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue22273>
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