linux-kernel - Re: bad rss-counter message in 3.14rc5

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Message-Id: <20140310214612.3b4de36a.akpm@linux-foundation.org>
Date:	Mon, 10 Mar 2014 21:46:12 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org, Linus Torvalds <torvalds@...ux-foundation.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Bob Liu <bob.liu@...cle.com>,
	Konstantin Khlebnikov <koct9i@...il.com>
Subject: Re: bad rss-counter message in 3.14rc5

On Mon, 10 Mar 2014 20:13:40 -0700 Andrew Morton <akpm@...ux-foundation.org> wrote:

> > Anyone ? I'm hitting this trace on an almost daily basis, which is a pain
> > while trying to reproduce a different bug..
> 
> Damn, I thought we'd fixed that but it seems not.  Cc's added.
> 
> Guys, what stops the migration target page from coming unlocked in
> parallel with zap_pte_range()'s call to migration_entry_to_page()?

page_table_lock, sort-of.  At least, transitions of is_migration_entry()
and page_locked() happen under ptl.

I don't see any holes in regular migration.  Do you know if this is
reproducible with CONFIG_NUMA_BALANCING=n or CONFIG_NUMA=n?

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