linux-kernel - Re: [PATCH] mm/mlock: fix BUG_ON unlocked page for nolinear VMAs

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Message-ID: <CA+55aFzDcFyyXwUUu5bLP3fsiuzxU7VPivpTPHgp8smvdTeESg@mail.gmail.com>
Date:	Fri, 3 Jan 2014 12:52:21 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Michel Lespinasse <walken@...gle.com>,
	Bob Liu <bob.liu@...cle.com>, Nick Piggin <npiggin@...e.de>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Mel Gorman <mgorman@...e.de>, Minchan Kim <minchan@...nel.org>,
	Hugh Dickins <hughd@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-mm <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm/mlock: fix BUG_ON unlocked page for nolinear VMAs

On Fri, Jan 3, 2014 at 12:17 PM, Sasha Levin <sasha.levin@...cle.com> 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.

And I detest the patch that was sent out that said "Should I check?"

Maybe we should just remove that mlock_vma_page() thing instead in
try_to_unmap_cluster()? Or maybe actually lock the page around calling
it?

             Linus
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