odd increase in SERVFAIL with "misc failure" reason

[Yorgos Thessalonikefs]

Hi Olivier,

We are already working on it and we believe we have a solution.
Would you like to be involved with preliminary testing?

Best regards,
-- Yorgos

On 07/11/2024 15:56, Olivier Benghozi wrote:
> ... we've downgraded everything to 1.21.1, CPU and UDP Out Queries are 
> back to normal.
> Definitely 1.22.0 has a problem.
> 
> Le mer. 6 nov. 2024 à 19:42, Olivier Benghozi 
> <olivier.benghozi at wifirst.fr <mailto:olivier.benghozi at wifirst.fr>> a écrit :
> 
>     Hi Yorgos,
> 
>     yes, about serve-expired we have:
> 
>     serve-expired: yes
> 
>     serve-expired-ttl: 172800
> 
>     serve-expired-reply-ttl: 300
> 
>     serve-expired-client-timeout: 1600
> 
> 
>     ede-serve-expired: yes
> 
> 
> 
>     I've just downgraded one server in our DNS farm from 1.22.0 to
>     1.21.1 ; UDP Out queries value was immediately divided by 2.
> 
>     Le mer. 6 nov. 2024 à 19:12, Yorgos Thessalonikefs via Unbound-users
>     <unbound-users at lists.nlnetlabs.nl <mailto:unbound-
>     users at lists.nlnetlabs.nl>> a écrit :
> 
>         Hi Olivier,
> 
>         This (more upstream queries) may be related to another issue
>         that we are
>         investigating.
>         Do you happen to have serve-expired enabled in Unbound?
> 
> 
>         On 06/11/2024 18:56, Olivier Benghozi via Unbound-users wrote:
>          > ... and CPU usage is x1.5.
>          > Something seems wrong.
>          >
>          > Le mer. 6 nov. 2024 à 18:11, Olivier Benghozi
>          > <olivier.benghozi at wifirst.fr
>         <mailto:olivier.benghozi at wifirst.fr>
>         <mailto:olivier.benghozi at wifirst.fr
>         <mailto:olivier.benghozi at wifirst.fr>>> a écrit :
>          >
>          >     Here we observe a big increase of UDP Out queries when
>         updating from
>          >     1.21.0 to 1.22.0 (factor x4).
>          >     Doesn't seem to be linked to max-global-quota
> 
> 
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