From owner-freebsd-hackers  Fri Aug  7 23:35:28 1998
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Date: Sat, 8 Aug 1998 01:34:56 -0500
From: "Matthew D. Fuller" <fullermd@futuresouth.com>
To: dg@root.com
Cc: FreeBSD-security@FreeBSD.ORG, hackers@FreeBSD.ORG
Subject: Re: Does this mean we have another breakin?
References: <199808072337.RAA13808@lariat.lariat.org> <199808080135.SAA00798@implode.root.com>
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In-Reply-To: <199808080135.SAA00798@implode.root.com>; from David Greenman on Fri, Aug 07, 1998 at 06:35:55PM -0700
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On Fri, Aug 07, 1998 at 06:35:55PM -0700, David Greenman woke me up to tell me:
> >We were about to do it AGAIN. Now we're holding out some hope that it's
> >just a bug -- though perhaps the same one that's crashing us when we try to
> >back up.
> >
> >In any event, I just received private e-mail stating that at least one
> >person has encountered VM problems in -stable under heavy CPU loads when
> >the swapper kicks in. According to the message, they cause corruption of
> >file modification dates. 
> 
>    Corruption is probably not the right word. There might be a bug where a
> page is seen as modified when it isn't, causing the modify date to get
> updated. The only way to be certain is to compare the binary with your
> backup (e.g. if installed from CDROM, then with the copy on the CDROM). I
> haven't personally seen this happen in more than a year, so if the bug is
> still there, it must be fairly rare.

We get it all the time here.
On sendmail on one machine (sendmail -q run out of cron) and on
{r}restore on another machine (amanda, I'm guessing)
Happens every couple days.


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|       FreeBSD; the way computers were meant to be       |
* "The only reason I'm burning my candle at both ends, is *
| that I haven't figured out how to light the middle yet."|
*    fullermd@futuresouth.com      :-}  MAtthew Fuller    *
|      http://keystone.westminster.edu/~fullermd          |
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