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w is showing the wrong number of logged in users (as in this question), and the answer to that question is that the utmp file is corrupt. This seems likely, as a custom-built hello program is also getting the wrong number, and it works by reading utmp. I've narrowed down the issue to logins from a tty (that is, from someone who is physically at the server logging in using the keyboard attached to it). Essentially, logins from a tty seem to be recorded, but logouts aren't. What's going on?

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Are you asking how to reset utmp? Did you run the command /var/run/utmp mentioned in the answer? –  Kevin Bowen Jan 31 '13 at 13:03
    
I'm wondering if there's a way to not need to reset utmp, but make it work like it's supposed to on logout. –  cpast Jan 31 '13 at 17:02
    
@maggotbrain Also, that answer suggested that it is a good idea to do that command in single-user mode, and that's not really an option in my case. –  cpast Jan 31 '13 at 23:05
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