>> Is it possible that that kernel considers binding to an IPv6 port to
>> conflict with binding to the "same" port number as an IPv4 port?

Actually, I think that that may be expected behavior depending on the
vintage of the kernel.  Note the following comment in
StreamServerPort():

        /*
         * Note: This might fail on some OS's, like Linux older than
         * 2.4.21-pre3, that don't have the IPV6_V6ONLY socket option, and
         * map ipv4 addresses to ipv6.    It will show ::ffff:ipv4 for all
         * ipv4 connections.
         */

                        regards, tom lane

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