When I call glDrawElements and one of the used vbo has no data uploaded (but is set for some attribute), llvmpipe doesn’t set any error, I would expect at least a GL_INVALID_OPERATION to help debug that issue. If you need any more information just ask me.
If anything this would be a core issue. Can't really tell however what you're trying to do should actually generate an error.
Is this still an issue can you provide a piglit test or example app?
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