Re: frequent lockups in 3.18rc4

From: Dave Jones
Date: Fri Dec 26 2014 - 16:20:59 EST

On Fri, Dec 26, 2014 at 12:57:07PM -0800, Linus Torvalds wrote:

> I have a newer version of the patch that gets rid of the false
> positives with some ordering rules instead, and just for you I hacked
> it up to say where the problem happens too, but it's likely too late.

I'll give it a spin and see what falls out this evening.

> So I'm still a bit unhappy about not figuring out *what* is wrong. And
> I'd still like the dmidecode from that machine, just for posterity. In
> case we can figure out some pattern.

So this is something I should have done a long time ago.
Googling for the board name shows up a very similar report
from a year ago, except that was within kvm, and was aparently fixed. and
(dmidecode attachment there is pretty much the same as mine)

> - actual hardware bug.
> This is *really* unlikely, though. It should hit everybody. The
> HPET is in the core intel chipset, we're not talking random unusual
> hardware by fly-by-night vendors here.

This machine is allegedly a 'production' box from Intel, but
given Kashyap saw something very similar I'm wondering now if there
was some board/bios errata for this system.

There's a few Intel folks cc'd here, maybe one those can dig up whether
there was anything peculiar about Shark Bay systems that would
explain the HPET getting screwed up.

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