stable/9 @r241776 panic: REDZONE: Buffer underflow detected...

[David Wolfskill]

On Sun, Oct 21, 2012 at 05:28:49PM -0700, Kevin Oberman wrote:
> ...
> This is starting to smell a bit like it may be tied to hardware. If
> you have two memory cards, you might want to try swapping them. If
> not, maybe let memtest86 run overnight.

There are 2 SODIMMS, yes.

So I reverted mjg@'s sys/kern/subr_bus.c patch, rebuilt the kernel, and
rebooted ... without issue: I was unable to reproduce the problem.

Despite my inability to reproduce it, I went ahead & powered down,
swapped the SODIMMs, and rebooted.  Still no recurrence.

> Yes, this is a total shot in the dark, but this one is really weird
> and when I see really weird, I start too look at hardware, especially
> memory and power supply. (And this really does not sound like power
> supply to me.)
> ...

The machine is a Dell Precision M4400, and I have extended to
hardware warranty.  So if I can actually demonstrate a real hardware
issue -- in a way that Dell will accept -- I should be able to get
it fixed.  (I've had a fair bit of practice at that, as the warranty
includes accidental damage -- and the time I got flipped off my
bicycle while the machine was in a (padded) rucksack qualified.)

That said, overnight is when the machine updates its local private
mirrors of the FreeBSD SVN repositories, so I can start my daily
rebuilds of stable/9 & head fairly early in the morning.  (I prefer
to get those -- as well as the port-updating -- completed before I
get in to work, as I use the laptop to access all of the other
machines I use.  And I exercise the just-built stable/9 for the rest of
the day....)

Peace,
david
-- 
David H. Wolfskill				david at catwhisker.org
Taliban: Evil men with guns afraid of truth from a 14-year old girl.

See http://www.catwhisker.org/~david/publickey.gpg for my public key.
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