Error: Password not accepted due to PAM restrictions

Today, I can’t login to my CP

I tried to change the admin password via command line but always get error Error: Password not accepted due to PAM restrictions

Search the forum and tried many things but didn’t work. After all, I found the reason is the disk is FULL (because of CP auto backup).

After removed the backup files, everything is working back.

Just want to feedback here if someone got the same problem.

Cheers.