In message <20150407193703.ga32...@sources.org>, Stephane Bortzmeyer writes:
> 
> I suspect that the resolvers at Free have been corrupted in some way
> (the CNAME duplication) but I wonder what would cause that?

I think you are seeing 2 bugs.

* The duplicate records shouldn't cause a validation failure, they
  should be removed when processing the answer.

* There is a bug in whatever piece of software is generating that
  result causing the qname not to pick up the target of the cname
  record prior to looping.

Mark
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: ma...@isc.org
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