Why are MySQL system user passwords incorrect?

Question

I was adding a user to my server via MySQL Workbench. Something went awry; the addition failed. Afterwards my root account could no longer access the DB via Workbench. (access denied)
I was able to connect as root from the command line mysql -uroot -p but root has no privileges.
This system has been in place and working, until now, for over a year

The log shows:
Found invalid password for user: 'mysql.infoschema@localhost'; Ignoring user
Found invalid password for user: 'mysql.session@localhost'; Ignoring user
Found invalid password for user: 'mysql.sys@localhost'; Ignoring user

I have no user with GRANT privileges.
How can I correct the invalid Password issue for these system users?

MySQL 8
Centos 7

Answer 1

Those have intentional invalid passwords.

If you still have access issues it might be a good idea to verify that you don't have any memory corruption or disk corruption.

If you fail to get access you can in the absolute worst case you could start mysql in insecure mode, which let's you do whatever you want. (or rather will anyone do so, so disable network access first)

make backups, and be careful!