Subject: Re: Make sure we populate the initroot filesystem late enough
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: David Woodhouse <dwmw2@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>, linuxppc-dev@ozlabs.org,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       john stultz <johnstul@us.ibm.com>
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Date: Mon, 26 Feb 2007 16:53:27 +0100
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On Sun, 2007-02-25 at 23:01 -0500, David Woodhouse wrote:

> Yeah, I did that before giving up on it for the day and going in search
> of dinner. It changes the failure mode to a BUG() in
> cache_free_debugcheck(), at line 2876 of mm/slab.c
> 
> It smells like the pages weren't actually reserved in the first place
> and we were blithely allocating them. The only problem with that theory
> is that the initrd doesn't seem to be getting corrupted -- and if we
> were handing out its pages like that then surely _something_ would have
> scribbled on it before we tried to read it.
> 
> When I head back in tomorrow morning I'll instrument free_initrd_mem()
> to check that the PageReserved bit was actually set on each page, before
> clearing it. And I'll make the page allocation routines check whether
> they're giving out pages between initrd_start and initrd_end, etc.

And check that we didn't end up stupidly having the initrd share a page
with something else ... (like not aligned end or such thingy).

Ben.


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