linux-kernel - Re: 2.6.18-mm2 boot failure on x86-64

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Message-Id: <1160157830.29690.66.camel@flooterbu>
Date:	Fri, 06 Oct 2006 13:03:50 -0500
From:	Steve Fox <drfickle@...ibm.com>
To:	Mel Gorman <mel@...net.ie>
Cc:	Vivek Goyal <vgoyal@...ibm.com>, Andi Kleen <ak@...e.de>,
	Badari Pulavarty <pbadari@...ibm.com>,
	Martin Bligh <mbligh@...igh.org>,
	Andrew Morton <akpm@...l.org>,
	lkml <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
	kmannth@...ibm.com, Andy Whitcroft <apw@...dowen.org>
Subject: Re: 2.6.18-mm2 boot failure on x86-64

On Fri, 2006-10-06 at 18:11 +0100, Mel Gorman wrote:
> On (06/10/06 11:36), Vivek Goyal didst pronounce:
> > Where is bss placed in physical memory? I guess bss_start and bss_stop
> > from System.map will tell us. That will confirm that above memset step is
> > stomping over bss. Then we have to just find that somewhere probably
> > we allocated wrong physical memory area for bootmem allocator map.
> > 
> 
> BSS is at 0x643000 -> 0x777BC4
> init_bootmem wipes from 0x777000 -> 0x8F7000
> 
> So the BSS bytes from 0x777000 ->0x777BC4 (which looks very suspiciously
> pile a page alignment of addr & PAGE_MASK) gets set to 0xFF. One possible
> fix is below. It adds a check in bad_addr() to see if the BSS section is
> about to be used for bootmap. It Seems To Work For Me (tm) and illustrates
> the source of the problem even if it's not the 100% correct fix.

I was able to boot the machine with Mel's patch applied on top of
-git22.

-- 

Steve Fox
IBM Linux Technology Center
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