Cycles and mesh problem

hi guys,
i’ve got a problem with a mesh and cycles.
the mesh is right… it seems there are not problems with the normals and doubles vertices but Cycles give me this result:


if you want to have a look, this is the file:
cycles error.blend (776 KB)

do you think that this is a bug or my fault?
thank you.

… ok, it seems to be a viewport bug because during the rendering this problem doesn’t appear.

Yup build 42615 renders ok but appears in render display mode

Also happens in 43916 (2.62 rc1)

yes, the problem remains with new release.
thank you :wink: