grows kernel memory

Hello.

I have an application statsd (https://github.com/etsy/statsd) written on nodejs. It receive around 800krps metrics (udp trafic) and works fine on Solaris 11.3. After upgrade OS to 11.4 (nodejs version remains the same, like on 11.3) kernel memory ("Regular Kernel" from output 'echo ::memstat | mdb -k') grows very quickly (30Gb per minute) until the whole memory is over and server hangs. Size/Res memory of the application statsd not grows.

Also, I have other nodejs applications on 11.3/11.4 and they works fine.

I tried to restrict size of user_reserve_hint_pct, but nothing was changes.

Is there any way to determine why kernel memory grows and how to fix it?