ps shows wierd clock time values ?
Tobias Speckbacher
TSpeckbacher at quova.com
Tue Apr 12 18:21:35 UTC 2005
> -----Original Message-----
> From: redhat-list-bounces at redhat.com [mailto:redhat-list-
> bounces at redhat.com] On Behalf Of Ben Russo
> Sent: Tuesday, April 12, 2005 8:32 AM
> To: redhat-list at redhat.com
> Subject: ps shows wierd clock time values ?
>
> Today I looked at a system that has weird timestamp/clock issues?
> Anybody seen this before, know what it is?
> I have some excerpts of commands below that demonstrate the issue.
> Please note the 2006, and April 15 dates on some of the processes and
> file timestamps as well as process times last year, when the "uptime"
> says only 17 days (March 25th).... But I could swear that the box has
> been up for a LONG time (like maybe 2+ years?)
> Doesn't make sense.
What you are seeing are symptoms of the "jiffies overflow" bug.
The problem is that uptime and process related time values are stored as
a 32 bit values which contain the number of jiffies elapsed (jiffie =
1/100th second). Basically the counter overflows after 497 days of
uptime and the symptoms your system exhibits appear.
Upgrading the kernel to a more recent version should fix the issue.
>
> This is our billing server, so if the system clock/date is skewing
> wildly this could cause havoc with our accounting.
>
>
> [root at harp2 root]# cat /etc/redhat-release ; date ; ntpq -np ; ps -ef
|
> grep ntp ; ps -ef ; ls -l /var/lock/subsys/* ; ps -ef | grep xfs
>
> Red Hat Linux Advanced Server release 2.1AS (Pensacola)
>
> Tue Apr 12 11:06:08 EDT 2005
>
> remote refid st t when poll reach delay
offset
> jitter
>
========================================================================
==
> ====
> *172.17.3.47 208.224.248.17 3 u 183 1024 377 0.963 -0.049
> 0.076
> +172.17.3.253 208.224.248.18 3 u 691 1024 377 0.971 0.455
> 0.391
> +172.17.200.63 208.224.248.18 3 u 543 1024 377 110.811 -18.125
> 23.673
>
> ntp 2112 1 0 Nov24 ? 00:00:11 ntpd -U ntp -p
> /var/run/ntpd.pid
>
>
> root 24347 21094 0 11:06 pts/9 00:00:00 grep ntp
> UID PID PPID C STIME TTY TIME CMD
> root 1 0 0 Mar25 ? 00:02:47 init [3]
> root 2 1 0 Mar25 ? 00:00:00 [keventd]
> root 3 1 0 Mar25 ? 00:00:00 [keventd]
> root 4 0 0 Mar25 ? 00:00:27 [ksoftirqd_CPU0]
> root 5 0 0 Mar25 ? 00:01:19 [ksoftirqd_CPU1]
> root 6 0 0 Mar25 ? 02:06:02 [kswapd]
> root 7 0 0 Mar25 ? 00:00:00 [kreclaimd]
> root 8 0 0 Mar25 ? 00:03:10 [krefilld]
> root 9 0 0 Mar25 ? 00:05:59 [bdflush]
> root 10 0 0 Mar25 ? 00:00:19 [kupdated]
> root 11 1 0 Mar25 ? 00:00:00 [mdrecoveryd]
> root 17 1 0 Mar25 ? 00:00:00 [aacraid]
> root 18 1 0 Mar25 ? 00:00:00 [scsi_eh_0]
> root 21 1 0 Mar25 ? 00:05:03 [kjournald]
> ....
> root 639 1 0 Mar25 ? 00:00:01 inetd
> root 731 1 0 Mar25 ? 00:00:03 sendmail: accepting
> connections
> dbadmin 1331 1 0 Mar25 ? 00:01:29 caplog
> dbadmin 3185 1 0 Mar25 ? 00:00:09 forwardlog harp2
> oracle 17916 1 0 Mar30 ? 00:00:00 -bash
> dbadmin 12403 1 0 Mar31 ? 00:00:01 caplog -s 1
> xfs 21632 1 0 Apr15 ? 00:00:00 xfs -droppriv -daemon
> root 21879 1 0 Apr15 ? 00:00:00 login -- root
> root 23612 21879 0 Apr15 tty1 00:00:00 -bash
> dbadmin 19199 1 0 Jun01 ? 00:00:05 /bin/ksh
> /u2/batch/bin/v51watch.
> root 28152 1 0 Jun16 tty2 00:00:00 /sbin/mingetty tty2
> root 20657 1 0 Jun19 ? 00:00:00 /usr/bin/python
> /usr/sbin/rhn_ch
> root 10000 1 0 Aug09 ? 00:00:00 /usr/bin/python
> /usr/sbin/rhn_ch
> root 14317 1 0 Aug13 ? 00:00:00 /usr/bin/python
> /usr/sbin/rhn_ch
> tomcat4 25035 1 0 Sep12 ? 00:00:02
> /usr/java/j2sdk1.4.2_02/bin/java
> ...
> root 25205 1 0 Sep12 ? 00:00:06 /usr/sbin/httpd
> -DHAVE_ACCESS -D
> tomcat4 16379 25038 0 Sep22 ? 00:00:00
> /usr/java/j2sdk1.4.2_02/bin/java
> tomcat4 16381 25038 0 Sep22 ? 00:00:00
> /usr/java/j2sdk1.4.2_02/bin/java
> dbadmin 16369 1 0 Nov08 ? 00:00:57 /bin/ksh
> ./report_ftp_search.sh
> root 31818 1 0 Nov21 ? 00:02:12 xinetd -stayalive
> -pidfile /var/
> ntp 2112 1 0 Nov24 ? 00:00:11 ntpd -U ntp -p
> /var/run/ntpd.pid
> lp 15509 1 0 Dec12 ? 00:00:00 lpd Waiting
> ...
> dbadmin 17501 14066 0 Dec27 ? 00:00:00 [IMPO <defunct>]
> dbadmin 17727 14066 0 Dec27 ? 00:00:00 [IMPO <defunct>]
> dbadmin 17782 14066 0 Dec27 ? 00:00:00 [IMPO <defunct>]
> dbadmin 5565 1 0 2006 ? 00:00:00 /bin/ksh
> /u2/outclear/billing/ci
> dbadmin 5577 5565 0 2006 ? 00:00:00 /bin/sh
> /u2/outclear/bin/billing
> dbadmin 32343 1 0 2006 ? 00:00:00 pgp -ks 0x58453DD3 -u
> TNSNDM01
> dbadmin 20757 1 0 2006 ? 00:07:10 /bin/ksh
> /u2/batch/bin/webwatch.
> root 16793 1 0 2006 ? 00:00:06 crond
> root 17523 1 0 2006 ? 00:05:06 /usr/sbin/sshd
> root 17567 1 0 2006 ? 00:02:44 syslogd -m 0
> root 17572 1 0 2006 ? 00:00:00 klogd -2
> root 30732 17523 0 Apr04 ? 00:00:01 /usr/sbin/sshd
> lowellc 30733 30732 0 Apr04 pts/7 00:00:00 -ksh
> root 30751 30733 0 Apr04 pts/7 00:00:00 su - dbadmin
> dbadmin 30752 30751 0 Apr04 pts/7 00:00:00 -ksh
> root 4262 17523 0 Apr05 ? 00:00:00 /usr/sbin/sshd
> lowellc 4276 4262 0 Apr05 pts/8 00:00:00 -ksh
> root 4301 4276 0 Apr05 pts/8 00:00:00 su - dbadmin
> dbadmin 4307 4301 0 Apr05 pts/8 00:00:00 -ksh
> dbadmin 25975 30752 0 Apr11 pts/7 00:00:00 ping guinness1
> dbadmin 25976 30752 0 Apr11 pts/7 00:00:00 ping
> guinness2.red.tnsi.com
> dbadmin 32101 30752 0 Apr11 pts/7 00:00:00 grep -i c
> apache 1099 25205 0 04:02 ? 00:00:00 /usr/sbin/httpd
> -DHAVE_ACCESS -D
> ...
> apache 1109 25205 0 04:02 ? 00:00:00 /usr/sbin/httpd
> -DHAVE_ACCESS -D
> tomcat4 1111 25038 0 04:02 ? 00:00:00
> /usr/java/j2sdk1.4.2_02/bin/java
> dbadmin 8319 30752 0 08:32 pts/7 00:00:00 ping 10.62.4.56
> ...
> dbadmin 24292 22272 0 11:05 pts/7 00:00:00 /bin/ksh
> /u2/idplus/bin/format_o
> dbadmin 24314 24292 0 11:06 pts/7 00:00:00 /bin/ksh
> /u2/idplus/bin/run_idpl
> dbadmin 24342 24314 0 11:06 pts/7 00:00:00 sleep 1
> root 24348 21094 0 11:06 pts/9 00:00:00 ps -ef
>
>
>
> -rw-r--r-- 1 root root 0 Nov 24 17:10
> /var/lock/subsys/crond
> -rw-r--r-- 1 root root 0 May 3 2004
> /var/lock/subsys/httpd
> -rw-r--r-- 1 root root 0 Nov 14 2003
> /var/lock/subsys/inet
> -rw-r--r-- 1 root root 0 Nov 14 2003
> /var/lock/subsys/keytable
> -rw-r--r-- 1 root root 0 Nov 14 2003
> /var/lock/subsys/kudzu
> -rw-r--r-- 1 root root 0 Nov 14 2003
> /var/lock/subsys/local
> -rw-r--r-- 1 root root 0 Aug 2 2004
> /var/lock/subsys/lpd
> -rw-r--r-- 1 root root 0 Nov 14 2003
> /var/lock/subsys/network
> -rw-r--r-- 1 root root 0 Jul 15 2004
> /var/lock/subsys/ntpd
> -rw-r--r-- 1 root root 0 Nov 14 2003
> /var/lock/subsys/random
> -rw-r--r-- 1 root root 0 Nov 14 2003
> /var/lock/subsys/sendmail
> -rw-r--r-- 1 root root 0 Nov 24 17:13
> /var/lock/subsys/sshd
> -rw------- 1 root root 0 Nov 24 17:13
> /var/lock/subsys/syslog
> -rw-r--r-- 1 root root 0 May 3 2004
> /var/lock/subsys/tomcat4
>
> -rw-r--r-- 1 root root 0 Dec 5 2003
> /var/lock/subsys/xfs
>
> -rw-r--r-- 1 root root 0 Jul 12 2004
> /var/lock/subsys/xinetd
>
>
> xfs 21632 1 0 Apr15 ? 00:00:00 xfs -droppriv -daemon
> root 24351 21094 0 11:06 pts/9 00:00:00 grep xfs
>
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