ps shows wierd clock time values ?

[Tobias Speckbacher]

> -----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 11:47 AM
> To: General Red Hat Linux discussion list
> Subject: Re: ps shows wierd clock time values ?
> 
> Tobias Speckbacher wrote:
> >>-----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.
> >
> >
> >
> 
> Thanks, I just found that out myself...
> 
> http://www.ussg.iu.edu/hypermail/linux/kernel/0202.2/0337.html
> 
> But I am running a RedHat Enterprise Linux Kernel 2.4.9-e.27
> which was built on Tue 05 Aug 2003 by RedHat.
> Isn't that kernel already patched for this OLD bug?
> 
> I have tried searching RedHat bugzilla for the Jiffies bug to see
> If I could find a specific kernel version that listed it as
> "fixed" but I haven't seen that, just a mention that in the old
> RedHat 7.1 it was "closed"
> 
> If I upgrade the kernel to 2.4.9-e.59 (the latest RHEL-AS-2.1 kernel)
> will that have the fix?

I don't think this is fixed, I just checked include/linux/sched.h in the
.59 source and it shows start_time typed as unsigned long which would
mean it is still using 32 bit storage.  Whereas the patches I found type
this value to u64.

Worth confirming with RH though if your support contract is still valid.

> 
> -Ben.
> 
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