linux-kernel - Re: OF-related boot crash in 3.3.0-rc3-00188-g3ec1e88

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Message-ID: <20120222170330.GA29521@merkur.ravnborg.org>
Date:	Wed, 22 Feb 2012 18:03:30 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	Meelis Roos <mroos@...ux.ee>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	sparclinux@...r.kernel.org,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: OF-related boot crash in 3.3.0-rc3-00188-g3ec1e88

On Mon, Feb 20, 2012 at 05:05:37PM -0800, Tejun Heo wrote:
> Hello,
> 
> Meelis, can you please apply the following patch before & after the
> offending commit, boot with "memblock=debug" added as kernel param and
> post the boot log?  The patch will generate some offset warnings after
> the commit but should work fine.
> 
> Sam, David, as I'm not familiar with the code base, is it possible to
> tell which address is corrupted (zeroed, it seems)?  ie. can we add
> "if (XXX == NULL) printk("%p is corrputed\n"...);" somewhere?

No idea - sorry. I spend most of the time with sparc32 - which I
do not even feel familiar with yet :-(

One thing I noticed while working with memblock for sparc32 (*) is that allocations
are done top-down. So we may end up allocatng memory with a considerably higher
address than we are used to.
This is obviously just a wild guess...

Meelis - do the affected boxes have any special memory configurations?
Could you try to boot with a sensible mem=xxx value to see if limiting the memory
helps.

(*) I have re-done the original patch-set and I have a quite good feeling about it.
HIGHMEM support is outstanding - I got a bit confused when I looked at x86.

But my ss5 crashes the first time I try to use the allocated memory - 
so I assume I have some silly issue somewhere. Nothing points at memblock
in this case.

	Sam
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