Subject: Bug or No?

From: "[email-masked]" <[email-masked]>
Date: Wed, 25 Nov 2015 17:11:12 +0800

Hi, 

    Recently, i use CentOS release 6.5 Final.    On one client, i logged with root user, on another, i logged with custom user. On the former client, i use su for changing user to another user(for example userA),     Now, i use w or who , the result don't return the userA. why?

    My Linux kernal version is:

                    2.6.32-431.el6.x86_64

[email-masked]