origin-www.generalmills.com has no CNAME records.
Question and response
Question
dig origin-www.generalmills.com. NS
Answer
The response has no answer records.
Authority
generalmills.com. 845 SOA mgoextdns1.genmills.com. dom\.admin.genmills.com. 15897 900 600 2419200 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0