Sporadic Timeouts after upgrading to bind9.20

[Klaus Darilion]

Sorry, I forgot to mention that this is an authoritative nameserver. (For several ccTLDs. Each customers has its own Bind process. Currently I only noticed timeouts on Binds hosting bigger ccTLDs).

I will look how to integrate eu-stack into our monitoring check.

Thanks
Klaus


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Klaus Darilion, Head of Operations
nic.at GmbH, Jakob-Haringer-Straße 8/V
5020 Salzburg, Austria

From: Ondřej Surý <ondrej at isc.org>
Sent: Wednesday, September 4, 2024 7:23 PM
To: Klaus Darilion <klaus.darilion at nic.at>
Cc: bind-users at lists.isc.org
Subject: Re: Sporadic Timeouts after upgrading to bind9.20

Klaus,

is that recursive or authoritative? Anything unusual like RPZ or catz?

Try snapshoting the call stack with eu-stack and save the one when the timeout happens.

Ondrej
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Ondřej Surý — ISC (He/Him)

My working hours and your working hours may be different. Please do not feel obligated to reply outside your normal working hours.


On 4. 9. 2024, at 19:06, Klaus Darilion via bind-users <bind-users at lists.isc.org<mailto:bind-users at lists.isc.org>> wrote:

Hello!

On our production name servers we have check every 30s if bind is alive by sending a SOA query to bind. Today I upgraded a few nodes from 9.18.x (x between 17 and 27) to 9.20.1 (Ubuntu 24.04 with packages from ISC ppa).

Since that, we have sporadic timeouts (3s). On the nodes with more qps we see it more often.

Before I dig into the problem, are there any specific changes to 9.20 that I should look at? Maybe some default value changes for socket buffers, thread handling …?

Thanks
Klaus

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Klaus Darilion, Head of Operations
nic.at GmbH, Jakob-Haringer-Straße 8/V
5020 Salzburg, Austria

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