Re: public DoH/DoT dnsdist 1.9.8 exited on signal 11

Remi Gacogne via Pdns-users <[email protected]> Mon, 3 Feb 2025 10:39:04 +0100

Newsgroups	gmane.network.dns.powerdns.user
Message-ID	<[email protected]>

Hi,

On 01/02/2025 10:06, Christoph via Pdns-users wrote:
> preliminary hypothesis
> ----------------------
> This issue is more likely triggered starting with dnsdist 1.9.8
> when dnsdist distributes queries to multiple servers
> but not when dnsdist distributes queries to a single resolver only.
> 
> We expect to see more crashes and maye we manage to get hold of a core 
> dump file.
> 
> Unfortunately we can not really do A / B tests to backup this hypothesis 
> because we only have a single endpoint with actual user queries, but 
> maybe you have an environment to confirm that hypothesis.
> 
> 
> We used the information below to come to that hypothesis.

Thanks a lot! This clearly seems to point to a regression in 1.9.8 
indeed, since the configuration on the second server did not change. 
However I reviewed the (few) changes between 1.9.7 and 1.9.8 and 
unfortunately nothing really pops up. I checked whether anything changed 
in the FreeBSD port between these two versions but there was no changes[1].
So I'm a bit out of ideas, getting a core dump / backtrace would be 
great, and if that's not possible confirming whether the issue indeed 
goes away if you downgrade to 1.9.7 would be helpful as well.

[1]: 
https://cgit.freebsd.org/ports/commit/dns/dnsdist?id=457436dab3835780c9a40f2bbf10df462ba9604f

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

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