[PATCH][BZ 21295] getaddrinfo: do not overwrite IPv6 IPs with IPv4 when using AF_UNSPEC

[Florian Weimer]

On 07/06/2017 11:02 AM, Stefan Liebler wrote:
> I've recognized the test-fail resolv/tst-resolv-basic on some but not
> all machines of mine on different architectures s390, intel, power and
> according to 2.26 release page, Joseph also recognized it on his arm,
> mips, power32 machines:
> warning: could not become root outside namespace (Operation not permitted)
> warning: unshare (CLONE_NEWUTS) failed: Operation not permitted
> warning: could not enter network namespace
> error: addrinfo comparison failure
> query: www.example:80 [10]/0x18
> --- expected
> +++ actual
> @@ -1,3 +1,3 @@
>  flags: AI_V4MAPPED AI_ALL
> -address: STREAM/TCP 2001:db8::1 80
>  address: STREAM/TCP ::ffff:192.0.2.17 80
> +address: STREAM/TCP 2001:db8::1 80
> error: addrinfo comparison failure
> query: t.www.example:80 [10]/0x18

I saw this as well, but have not figured out whether it's due to UDP
response ordering or system configuration if (network) namespaces are
not in effect.

Would you please try the attached patch?  Thanks.

Florian
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