We have a facility to change password, once user logs into the application. So I successfully changed the password and clicked on 'logout' link which is configured to use GLO.
I am navigated to login screen.(What I found during debugging is, session is not invalidated. Handlers on IDP are not invoked meaning request is not redirected to IDP. ). If I give same user id and new password, it is again redirecting me to login page(now session is invalidated via LogOutHandler from IDP).
Now if i try again, user is authenticated successfully and he is displayed with our main menu.