linux-kernel - Re: bisected crash due to "x86: Move swiotlb initialization before dma32_free

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Message-Id: <20091215201039V.fujita.tomonori@lab.ntt.co.jp>
Date:	Tue, 15 Dec 2009 20:10:48 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	mingo@...e.hu
Cc:	fujita.tomonori@....ntt.co.jp, yinghai@...nel.org,
	rdreier@...co.com, linux-kernel@...r.kernel.org
Subject: Re: bisected crash due to "x86: Move swiotlb initialization before
 dma32_free_bootmem"

On Tue, 15 Dec 2009 11:56:50 +0100
Ingo Molnar <mingo@...e.hu> wrote:

> 
> * FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> wrote:
> 
> > There are a few people who hit this. How many people use a box with over 
> > 256GB memory?
> > 
> > And you can work around this with "dma32_size" kernel boot option.
> 
> Well, since the kernel has not crashed before this change there's really just 
> two options as per upstream kernel regression policy: either we fix it or we 
> revert it.

As I wrote, here is a patch that can be applied to cleanly to the git
head:

http://www.kernel.org/pub/linux/kernel/people/tomo/misc/0001-x86-two-stage-swiotlb-initialization.patch

It fixes the problem. Yinghai, can you test it? It should work but
it's good to confirm it.

I simply wanted to say that it's not a bug that breaks lots of boxes
or leads to something serious like data corruption (no need to say
something like "revert it now!"). It's also worth investigating why it
breaks, I think.
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