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From: John Baldwin <jhb@freebsd.org>
To: rank1seeker@gmail.com
Subject: Re: UFS related panic (daily <-> find)
Date: Wed, 16 Oct 2013 16:50:52 -0400
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On Wednesday, October 16, 2013 6:49:12 am rank1seeker@gmail.com wrote:
> I've:
> Read whole disk with 'dd'
> Checked FS integrity from single user mode.
> Did a RAM test for ~5 hours (3 complete tests passed in a loop) via 
> memtest86+.
> 
> All passed without errors ...
> Now I'm posting this:
> 
> 
> FreeBSD 9.2-RELEASE #0 r256015
> i386
> ======================================================
> Fatal trap 12: page fault while in kernel mode
> fault virtual address   = 0x25
> fault code              = supervisor read, page not present
> instruction pointer     = 0x20:0xc083bd42

Same drill as before, see what instruction this is.  Actually, this looks to 
be in the same location as your last panic, so a NULL pointer is 0x1 instead 
of 0x0 again.  In my experience, this would still indicate failing RAM to me,
memtest86+ notwithstanding (memtest86+ is single threaded AFAIK, so it may
not stress the hardware quite the same, e.g. if the error is heat related, 
etc.).

-- 
John Baldwin