autovacuum worker process use high cpu and stuck for a long time

Recently，i meet a problem about autovacuum

this option "autovacuum: ANALYZE pg_catalog.pg_attribute" has lasted for a long time, and the process, "postgres :autovacuum worker process  ngfw_log" is using a high cpu. this problem is only found in this table——“pg_attribute”，what‘s the problem and how can i solve it or research ?

this is my configure

and the gdb bt result

looking forward to your reply .

thanks!