Example on wiki.
My system is gentoo linux
I'm pretty sure the Subdiv mesh is degenerate.
It seems to have 2 vertices which have 2 adjacent edges, but these verticies also have 2 adjacent faces! 2 edges means we're at a corner, so that vertex cannot have 2 adjacent faces.
I'm going to put some extra checks in the code to be more informative and not crash.
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