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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