Unboud 1.17.1-2 validator memory leak?

[Aleš Rygl]

Hi all,

     I am observing increasing memory usage by validator component 
(mem_mod_validator counter) of Unboud in time. I am running 1.17.1-2 on 
latest stable Debian (Bookworm) and have a detailed memory stats in 
Grafana. Our six instances of Unbound have the same behaviour. After 
some time validator component consumes all available memory on the 
server and has to be prevented by a restart. Unbound has following settings:

module-config: "respip validator iterator"
verbosity: 1
val-log-level: 2
logfile: "/var/log/unbound/unbound.log"
log-time-ascii: yes

statistics-interval: 900
statistics-cumulative: yes
extended-statistics: yes

num-threads: 12
num-queries-per-thread: 4096

msg-cache-size:    12G
rrset-cache-size:  24G
key-cache-size:    6G
neg-cache-size:    512M

msg-cache-slabs:   16
rrset-cache-slabs: 16
infra-cache-slabs: 16
key-cache-slabs:   16

infra-cache-numhosts: 1000000

Unbound reaches the limits above in about six days and usage by 
mem_cache_rrset and mem_cache_message stops growing. mem_mod_validator 
still grows. This is something what can be seen also in previous 
versions of Unbound. I can provide detailed stats if needed.

Any help is appreciated.

With regards

Ales Rygl