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Date:      Wed, 2 Apr 2003 11:29:06 -0800
From:      James Long <list@museum.rain.com>
To:        freebsd-questions@freebsd.org
Subject:   Re: Fatal trap after adding more memory
Message-ID:  <20030402112906.A16512@ns.museum.rain.com>
In-Reply-To: <20030402162618.GA530@blackman>; from freebsd@blackman.unixtechs.org on Wed, Apr 02, 2003 at 11:26:19AM -0500
References:  <20030401141454.N43325-100000@atlantis.atlantis.dp.ua> <20030401113952.GA34796@falcon.midgard.homeip.net> <20030402162618.GA530@blackman>

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On Wed, Apr 02, 2003 at 11:26:19AM -0500, Eric Ekong wrote:
> 
> I added memory to my machine yesterday and since then I have noticed
> Fatal traps when I try to do some intensive activity on the machine. 
> IE. make buildworld

That's a classic sign of faulty memory.  I had the same thing when I
bought four pieces of  256M ECC RAM.  I had two parts each built from
NEC and Samsung chips.  Much as I have liked Samsung in the past, any
time I had any piece of the Samsung memory installed, no matter which
slot, a buildworld running while doing some heavy tar compress/decom-
press operations would cause a fatal trap.  Run the NEC memory alone,
no problems.  Run either or both of the Samsung pieces alone, problems.

Remove the newly-added memory and ensure that the problems goes away.
If so, try using JUST the new memory alone, either one piece at a time,
or all at once, and see whether the problem occurs only when the new
memory is used.  If so, return the memory for a different make or 
better quality.




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