Unbound 1.7.3 eats too much memory comparing previous version

[ѽ҉ᶬḳ℠]

> Hi there,
>
> now I'm notice 1.7.3 eats too much RSS memory after ~1 week of non-stop
> unning.
>
> It seems 523 Mb too much instead ~200 Mb of previous version with same
> config.
>
> Is there memory leak occurs?
>
> WBR, Yuri
>

It has been driving me bonkers as I cannot pin it down but I am
experiencing an ever increasing memory usage on a kernel 4.17.4 system
and suspecting unbound 1.7.3 being the culprit.
For some reason a similar setup on a kernel 4.4.138 does no exhibit such
symptom.