I've been getting Out of Memory errors on my server, currently running 6.8, but I saw this on 6.6.5 as well.   Looking at processes it appears that a couple of smbd processes are using more than 50% of my memory. The specific smbd processes are owned by a user which is a "service account" used by two Proxmox servers for accessing a backups share and an "installers" share.   Any thoughts on 1) if Samba is the root cause and 2) why it's running out of control with memory?