nginx 99% cpu if upstream server address is ipv6

[Delta Yeh]

Hi,
  I'm doing a test for nginx to proxy ipv6 requests,

client(v6)----(v6)nginx(v6)----(v6)www

The nginx CPU is 99%

According to the post in the mailing list, nginx doesn't  support ipv6
upstream, but
I think it is better report an error other than 99% cpu  if ipv6
address is used in upstream.

BTW, any plan to  support ipv6 upstream?

BR,

DeltaY