Reboot investigation problem

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Operating Systems Linux Reboot investigation problem
# 1  
Old 06-11-2011
Reboot investigation problem

I have a linux server,in this i receive alarm as server has rebooted.
When i check uptime of the server it says that the server has rebooted but when i check output of who -b it says that the server rebooted very long back
Can some one help what is the issue here.

[root@x root]# uname -a
Linux 2.4.21-52.ELsmp #1 SMP Tue Sep 25 15:13:04 EDT 20
07 i686 i686 i386 GNU/Linux
[root@x root]# uptime
08:26:09 up 34 min, 0 users, load average: 0.00, 0.00, 0.00
[root@x root]# who -b
system boot Sep 20 09:41
# 2  
Old 06-11-2011
you must check date/time settings on your host.
* check your history related date.(date or TZ set)
* check boot scripts (is there any entry related ntpdate or date or TZ in rc.local or specific other scripts )
* check your ntpd script(if enable , `chkconfig --list ntpd`)
* check ntp.conf in main ntpd server (if use vmguest then check vmhost time settings)
* check your source files for who|last command (for any corruption /var/run/utmp and/or /var/log/wtmp)

and uptime most probably does not change..
# cat /proc/uptime|awk '{ split($1/3600, a, ".") ; x=a[2]*60/10000 ; printf "%d:%0.2d\n", a[1], x}'
# uptime|sed -n 's/.*up \([^ ]*\),.*/\1/p'

This User Gave Thanks to ygemici For This Post:
# 3  
Old 06-12-2011
this is known bug in 2.4 kernel

you can check the real uptime with

-bash-3.00$ last -xf /var/run/utmp runlevel
runlevel (to lvl 3)                    Wed Jan 12 15:11 - 08:45 (150+16:33)

utmp begins Wed Jan 12 15:11:58 2011

So this node is up 150days.

The bug report
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# 4  
Old 08-04-2011
Thnx for the help.
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