Ram Usage of Db rapildy increasing how free up it

In my db it is 32 gb ram but it fill now 24 gb rapidly. After hiiting the 32 mark the db restarted automatically . I have set the buufer size 27gb. then also it increasing.How do i free up the ram aor any solution reagarding to it. And my db server is on aws server. I have set the innodbbuffer size27gb.