[PATCH 3/3] resolv: Handle transaction ID collisions in parallel queries (bug 26600)

[Florian Weimer]

* Florian Weimer:

> This should fix the crash at least, it's a concurrency bug in the test:
>
> diff --git a/resolv/tst-resolv-txnid-collision.c b/resolv/tst-resolv-txnid-collision.c
> index 611d3736..db9a52b6 100644
> --- a/resolv/tst-resolv-txnid-collision.c
> +++ b/resolv/tst-resolv-txnid-collision.c
> @@ -309,6 +309,7 @@ do_test (void)
>      ((struct resolv_redirect_config)
>       {
>         .response_callback = response,
> +       .single_thread_udp = true,
>       });
>  
>    for (int rcode = 0; rcode <= 5; ++rcode)
>
> I doubt it will fix the other test failure, but I'm going to run the
> test over night with this test.

My tests over night looked good, and the above change is clearly needed,
so I have pushed that as commit b8b53b338f6da91e86d115a39da860cefac736ad.

Thanks,
Florian
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