Unbound 1.7.3 eats too much memory comparing previous version

[ѽ҉ᶬḳ℠]

>> 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.
> I'm using Solaris 10, not any Linux. So, this is not solution.
>

Perhaps a misunderstanding due to my phrasing. What I meant is that one
my systems is exhibiting some memory leakage too whilst the other is not.