From owner-freebsd-hackers  Fri Aug  7 21:03:57 1998
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Subject: Re: Does this mean we have another breakin?
In-Reply-To: <199808080135.SAA00798@implode.root.com> from David Greenman at "Aug 7, 1998  6:35:55 pm"
To: dg@root.com
Date: Fri, 7 Aug 1998 21:03:24 -0700 (PDT)
Cc: brett@lariat.org, roberto@keltia.freenix.fr, FreeBSD-security@FreeBSD.ORG,
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From: dima@best.net (Dima Ruban)
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David Greenman writes:
> >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 usually get this bug once in two weeks. But since file by itself
stays the same and machine doesn't crash, fixing/finding the problem
wasn't in out TODO list.

> 
> -DG
> 
> David Greenman
> Co-founder/Principal Architect, The FreeBSD Project
> 
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-- dima

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