linux-kernel - Re: [bug] ata subsystem related crash with latest -git

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Date:	Wed, 17 Oct 2007 21:20:16 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Mark Lord <lkml@....ca>
cc:	David Miller <davem@...emloft.net>, fujita.tomonori@....ntt.co.jp,
	jens.axboe@...cle.com, mingo@...e.hu, linux-kernel@...r.kernel.org,
	jgarzik@...ox.com, alan@...rguk.ukuu.org.uk, tomof@....org
Subject: Re: [bug] ata subsystem related crash with latest -git

On Thu, 18 Oct 2007, Mark Lord wrote:
> 
> Oh.. so this bug is supposed to only bite with DEBUG_PAGEALLOC=y ??

Yeah, this particular one really should only bite you with 
DEBUG_PAGEALLOC.

The SG code potentially _derefences_ a field past the end of the SG array, 
but it should be a read, and the result should never be used (it's used to 
calculate the pointer to past the end of the queue, so if it's used, 
there's another bug lurking).

> Then something else is broken, perhaps.  I just saw a long traceback 
> scroll off the top of the screen, with lots of bio_* functions in the 
> list and assumed it was the same bug.
> 
> Mmm.. I'll get out the camera and try it again now..

Please do. I wouldn't be surprised if it's also related to the SG changes, 
but I don't think it's the exact particular bug that Ingo saw.

		Linus
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