$upstream_addr containing the same ip twice

[Kunal Pariani]

Hello, 
I have just 1 backend server being reverse-proxied through nginx. The access log lists this one request for which the $upstream_addr has the same ip:port twice. Is this a bug ? 

::ffff:10.255.255.248:51947 - - [18/Feb/2015:19:52:43 -0600] "GET / HTTP/1.1" 302 454 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:35.0) Gecko/20100101 Firefox/35.0" "a.b.c.d:e, a.b.c.d:e " 

This is how the the log_format is defined 
log_format upstream '$remote_addr:$remote_port - $remote_user [$time_local] ' 
'"$request" $status $bytes_sent ' 
'"$http_referer" "$http_user_agent" "$upstream_addr"'; 

Thanks 
-Kunal 
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