linux-kernel - Re: early exception error

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Date:	Thu, 1 Jan 2009 15:02:57 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	david@...g.hm
Cc:	Andi Kleen <andi@...stfloor.org>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: early exception error

On Wed, Dec 31, 2008 at 10:17:06PM -0800, david@...g.hm wrote:
> On Thu, 1 Jan 2009, Andi Kleen wrote:
> 
> >On Wed, Dec 31, 2008 at 12:59:08PM -0800, david@...g.hm wrote:
> >>On Wed, 31 Dec 2008, Andi Kleen wrote:
> >>
> >>>>on the picture you sent me i noticed the message
> >>>>"Your memory is not aligned you need to rebuild your
> >>>>kernel with bigger NODEMAP SIZE shift=20" and then
> >>>>srat code complains about "No NUMA code hash function found"
> >>>>which looks a bit scary. Btw, could you post this picture
> >>>>on some public resource so NUMA people could check it?
> >>>
> >>>This case used to be handled cleanly (NUMA disabled), but perhaps
> >>>that has regressed. But still it sounds like something is going wrong,
> >>>unless his machine really has a very weird memory map.
> >>
> >>it shouldn't, it was one of the high-volume servers 4-5 years ago and only
> >>has 4G of ram in it
> >
> >From looking at the screenshot Cyrill sent you seem to have a funny
> >SRAT with overlapping areas that is rejected in the end. I suspect the
> >fallback code doesn't handle this properly.
> >
> >Does it work when you boot with numa=noacpi ?
> 
> it gets past the point where the bootmemory_debug messages flow by, but I 
> get another oops (snapshot of the screen is at 
> http://linux.lang.hm/linux/IMG00031.jpg )

Node setup seems to be still broken. You'll likely need a full
serial log with earlyprintk=serial (and no numa=...)

-Andi

-- 
ak@...ux.intel.com
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