why apparmor_parser process using such high CPU and how to stop it

Question

I have Ubuntu 21.04 installed on raspberry pi. Whole system is getting hanged so checked usage. And strangely apparmor_parser using almost 100% CPU.

I tried killing this process like below

Kill -s SIGKILL 3803

But it is not going anywhere.

Tried stopping apparmor and disabling it like below, but still that process is there

sudo systemctl stop apparmor
sudo systemctl disable apparmor

What should I try next???