linux-kernel - Re: Make sure we populate the initroot filesystem late enough

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Message-Id: <1172505207.11949.15.camel@localhost.localdomain>
Date:	Mon, 26 Feb 2007 16:53:27 +0100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linuxppc-dev@...abs.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	john stultz <johnstul@...ibm.com>
Subject: Re: Make sure we populate the initroot filesystem late enough

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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