linux-kernel - Re: Corrupted low memory in v3.9+

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Message-ID: <52603CD6.6080507@linux.intel.com>
Date:	Thu, 17 Oct 2013 12:39:02 -0700
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Olof Johansson <olof@...om.net>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Corrupted low memory in v3.9+

On 10/17/2013 11:57 AM, Olof Johansson wrote:
> 
> And the low memory checker never even ran before, since it had nothing
> to check. Earlier the lower reserved region would be included in the
> e820-reserved area if I read the code correctly, and now it's just
> marked reserved by the memblock code.
> 
> I guess it could be argued either way whether this is a regression or
> not; but at the end of the day we now have systems where this warning
> pops when it didn't use to. :(
> 

I'm wondering if this is a problem with the low memory checker (the
residual value of which I have to admit to being skeptical of) or
something else.

Could you boot the box with "debug memblock=debug" and earlyprintk
turned on and send the boot output?

	-hpa

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