[Bug network/14307] getaddrinfo() sends superfluous DNS requests in x86_64 programs for certain hostnames

["jvb127 at gmail dot com" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14307

--- Comment #3 from Jeroen van Bemmel <jvb127 at gmail dot com> 2012-06-30 02:23:01 UTC ---
(In reply to comment #2)
> Reproducible on HEAD.
> 
> The size of the response is what seems to be causing the second query -- 6 or
> more seems to be the trigger. My initial guess was that the first lookup led to
> an ERANGE internally, resulting in the second query, but that should have
> happened for 32-bit as well. So this might well be something else. This has
> nothing to do with whether there is a CNAME in the response.

You are correct that __gethostbyname2_r in sysdeps/posix/getaddrinfo.c returns
ERANGE the first time when using a 512-byte buffer, in 64-bit mode. It is then
retried with a 1024-byte buffer, and the call succeeds

However, the same call in 32-bit mode also uses a 512-byte buffer, and does not
return ERANGE.

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