First off what happened to bug 19839 ?
---------------
Ok continuing with this bug....

The man page for inet_ntop states the following:

       AF_INET6
              src  points  to  a struct in6_addr (in network byte
order) which is converted to a representation of this address in the
most
              appropriate IPv6 network address format for this
address.  The buffer dst must be at least INET6_ADDRSTRLEN bytes long.


INET6_ADDRSTRLEN  is  46,( #define INET6_ADDRSTRLEN 46 )

I prefer to not disagree with manuals (46 > 40).

Even if you decide to ignore this ->
In the following *should* be fixed:
1. the incorrect comment needs to be either removed or 'corrected'
2. addrbuf for ipv6 should be at least 46 or INET6_ADDRSTRLEN long.