linux-kernel - Re: [PATCH 2/3] HWPOISON: undo memory error handling for dirty pagecache

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Message-ID: <m2a9y2cpj7.fsf@firstfloor.org>
Date:	Fri, 10 Aug 2012 16:09:48 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	Andi Kleen <andi.kleen@...el.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tony Luck <tony.luck@...el.com>,
	Rik van Riel <riel@...hat.com>,
	"Jun'ichi Nomura" <j-nomura@...jp.nec.com>,
	Naoya Horiguchi <nhoriguc@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 2/3] HWPOISON: undo memory error handling for dirty pagecache

Naoya Horiguchi <n-horiguchi@...jp.nec.com> writes:

> Current memory error handling on dirty pagecache has a bug that user
> processes who use corrupted pages via read() or write() can't be aware
> of the memory error and result in discarding dirty data silently.
>
> The following patch is to improve handling/reporting memory errors on
> this case, but as a short term solution I suggest that we should undo
> the present error handling code and just leave errors for such cases
> (which expect the 2nd MCE to panic the system) to ensure data consistency.

Not sure that's the right approach. It's not worse than any other IO 
errors isn't it? 

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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