linux-kernel - Re: [PATCH 1/5] HWPOISON: define VM_FAULT_HWPOISON to 0 when feature is disabled

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Date:	Fri, 12 Jun 2009 08:28:42 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Wu Fengguang <fengguang.wu@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Nick Piggin <npiggin@...e.de>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Andi Kleen <andi@...stfloor.org>,
	"riel@...hat.com" <riel@...hat.com>,
	"chris.mason@...cle.com" <chris.mason@...cle.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH 1/5] HWPOISON: define VM_FAULT_HWPOISON to 0 when feature
 is disabled



On Fri, 12 Jun 2009, Ingo Molnar wrote:
> 
> This seems like trying to handle a failure mode that cannot be and 
> shouldnt be 'handled' really. If there's an 'already corrupted' page 
> then the box should go down hard and fast, and we should not risk 
> _even more user data corruption_ by trying to 'continue' in the hope 
> of having hit some 'harmless' user process that can be killed ...

No, the box should _not_ go down hard-and-fast. That's the last thing we 
should *ever* do.

We need to log it. Often at a user level (ie we want to make sure it 
actually hits syslog, possibly goes out the network, maybe pops up a 
window, whatever).

Shutting down the machine is the last thing we ever want to do. 

The whole "let's panic" mentality is a disease.

		Linus
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