[dnsdist] DNSDIST 1.3.3-3 from standard debian buster

Remi Gacogne remi.gacogne at powerdns.com
Wed Aug 14 09:07:36 UTC 2019

Hi Chris,

On 8/14/19 2:58 AM, Chris wrote:
> For this issue I have not been able to make any progress yet. I have
> asked my colleagues for help as I am a network admin by trade, something
> they found that may be potentially related is this kernel bug:
> https://bugzilla.kernel.org/show_bug.cgi?id=202997
> One of my colleagues also deployed a base install of Debian and did some
> testing with iperf; apparently he could reproduce the issue without
> involving PowerDNS at all. From the above link he has adjusted a few
> things but as of yet the problem hasn't been resolved.

That's very interesting, thank you! I'm a bit surprised to see the bug
entry marked as RESOLVED INVALID since clearly the sockets did not lock
up that way in earlier kernels under the same conditions.

Did you try reducing the sysctl net.core.{r,w}mem_{default,max} values
on your system to see if the issue remains?

I have been directed to this patch as another possible lead:


Do you know if your system receives a lot of fragmented UDP datagrams?

> I am wondering if there is a plan for official dnsdist 1.4 packages on
> Debian Stretch? I am going to need to use that for now as Buster isn't
> suitable for production in my environment yet.

We already provide 1.4.0 packages for Stretch at
https://repo.powerdns.com unless I'm missing something?

Best regards,
Remi Gacogne
PowerDNS.COM BV - https://www.powerdns.com/

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