Re: libcurl 8.16.0 spawning large number of getaddrinfo threads?

On Mon, 20 Oct 2025, Vadim Grinshpun via curl-library wrote:

> I'll look into enabling c-ares. In another part of this thread, Daniel 
> mentioned that c-ares can behave differently from getaddrinfo; are known 
> differences documented somewhere? (I'd like to ensure we won't get affected).

Personal anecdote as this fell out of one of the weirdest debugging
sessions I've ever had.  On certain windows machines with various
add-ons installed, correct DNS responses would come in on interfaces
other than that on which the request had been sent.  This would trigger
some anti-poisoning defenses in c-ares completely defeating lookup in
the application.  This was several years ago - c-ares may have relaxed
since then.

m

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Monty Brandenberg
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