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Can anyone explain me why w shows me a wrong number of users currently logged in?

root@host ~
# w
 20:14:54 up 17:13,  3 users,  load average: 0.00, 0.01, 0.05
USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU WHAT
root     pts/0    xx.xx.42.51    19:29    0.00s  0.50s  0.00s w
flint    pts/2    xx.xx.42.51    19:53    3:32   0.43s  0.00s tmux a

root@host ~
# who
root     pts/0        Aug 14 19:29 (xx.xx.42.51)
flint    pts/2        Aug 14 19:53 (xx.xx.42.51)

root@host ~
# users
flint root
share|improve this question
up vote 2 down vote accepted

/var/run/utmp can sometimes get corrupt and incorrectly report the number of users that are logged.

If you do a sudo tee /var/run/utmp < /dev/null it will get reset. It is not needed to be single-user but it is advisable: logged in users might see some weird results when they try to view users until they log out.

Sources and Redhat mailing list.

share|improve this answer
Use last to get an idea where it went wrong. Example line: ubuntu pts/21 :0 Sat Aug 6 23:12 gone - no logout – Lekensteyn Aug 15 '11 at 8:23
@Rinzwind Thanks a lot! Resetting the file fixed the problem :) – Flint Aug 16 '11 at 2:08
@Lekensteyn You're right. I saw few lines that say 'crashed' etc. – Flint Aug 16 '11 at 2:08

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