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Date:	Fri, 3 Jan 2014 15:56:00 -0800
From:	Andrew Morton <>
To:	Vlastimil Babka <>
Cc:	Linus Torvalds <>,
	Sasha Levin <>,
	Wanpeng Li <>,
	Michel Lespinasse <>,
	Bob Liu <>, Nick Piggin <>,
	KOSAKI Motohiro <>,
	Rik van Riel <>,
	David Rientjes <>,
	Mel Gorman <>, Minchan Kim <>,
	Hugh Dickins <>,
	Johannes Weiner <>,
	linux-mm <>,
	Linux Kernel Mailing List <>
Subject: Re: [PATCH] mm/mlock: fix BUG_ON unlocked page for nolinear VMAs

On Sat, 04 Jan 2014 00:36:18 +0100 Vlastimil Babka <> wrote:

> On 01/03/2014 09:52 PM, Linus Torvalds wrote:
> > On Fri, Jan 3, 2014 at 12:17 PM, Sasha Levin <> wrote:
> >>
> >> Ping? This BUG() is triggerable in 3.13-rc6 right now.
> > 
> > So Andrew suggested just removing the BUG_ON(), but it's been there
> > for a *long* time.
> Yes, Andrew also merged this patch for that:
> But there wasn't enough confidence in the fix to sent it to you yet, I guess.
> The related thread:

Yes, I'd taken the cowardly approach of scheduling it for 3.14, with a
3.13.x backport.

Nobody answered my question!  Is this a new bug or is it a
five-year-old bug which we only just discovered?

I guess it doesn't matter much - we should fix it in 3.13.  I'll
include it in the next for-3.13 batch.

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