linux-kernel - Re: 2.6.22-rc1-mm1

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Date:	Thu, 07 Jun 2007 10:49:48 +0100
From:	Andy Whitcroft <apw@...dowen.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Mel Gorman <mel@....ul.ie>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Steve Fox <drfickle@...ibm.com>
Subject: Re: 2.6.22-rc1-mm1

H. Peter Anvin wrote:
> Andy Whitcroft wrote:
>>> It definitely sounds like a memory clobber of some sort.
>>>
>>> Usual suspects, in addition to the input/output buffers you already
>>> looked at, would be the heap and the stack.  Finding where the stack
>>> pointer lives would be my first, instinctive guess.
>> The stack seems to be where it should be and seems to stay pretty much
>> in the same place as it should.  Adding checks for the heap also seem to
>> stay within bounds.  I've tried making the stack and the heap 64k to no
>> effect.
>>
>> Moving the kernel to other places in memory seems to kill the decode
>> completely during gunzip() which may be a hint I am not sure.
>>
>> This thing is trying to ruin my mind.
>>
> 
> Yours and mine both.  Seems like *something* is clobbering memory, but
> what and why is a mystery.  The fact that putting the kernel in a higher
> point in memory is a good indication that this clobber is at a
> relatively high address.
> 
> How much RAM does this machine have?

This is as 12GB machine.  3 numa nodes.

I checked out the location of the IDT and GDT and both seem sane, in the
9xxxx range below the kernel destination.

I also note that on another machine of this type, one Node only in that
case some of the "did work" cases do not work.  Also when I applied some
of my patches on the top "working" cases stopped working.  So whatever
it is is definatly related to the shape of the kernel to be loaded.
Very confusing.

-apw
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