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Date:	Wed, 11 Nov 2009 11:37:19 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Hugh Dickins <hugh.dickins@...cali.co.uk>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Izik Eidus <ieidus@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 6/6] mm: sigbus instead of abusing oom

On Tue, 10 Nov 2009 22:06:49 +0000 (GMT)
Hugh Dickins <hugh.dickins@...cali.co.uk> wrote:

> When do_nonlinear_fault() realizes that the page table must have been
> corrupted for it to have been called, it does print_bad_pte() and
> returns ... VM_FAULT_OOM, which is hard to understand.
> 
> It made some sense when I did it for 2.6.15, when do_page_fault()
> just killed the current process; but nowadays it lets the OOM killer
> decide who to kill - so page table corruption in one process would
> be liable to kill another.
> 
> Change it to return VM_FAULT_SIGBUS instead: that doesn't guarantee
> that the process will be killed, but is good enough for such a rare
> abnormality, accompanied as it is by the "BUG: Bad page map" message.
> 
> And recent HWPOISON work has copied that code into do_swap_page(),
> when it finds an impossible swap entry: fix that to VM_FAULT_SIGBUS too.
> 
> Signed-off-by: Hugh Dickins <hugh.dickins@...cali.co.uk>

Thank you !
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

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