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

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Message-Id: <20140310220158.7e8b7f2a.akpm@linux-foundation.org>
Date:	Mon, 10 Mar 2014 22:01:58 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Dave Jones <davej@...hat.com>
Cc:	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 Tue, 11 Mar 2014 00:51:09 -0400 Dave Jones <davej@...hat.com> wrote:

> On Mon, Mar 10, 2014 at 09:46:12PM -0700, Andrew Morton wrote:
>  > 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?
> 
> CONFIG_NUMA_BALANCING was n already btw, so I'll do a NUMA=n run.

There probably isn't much point unless trinity is using
sys_move_pages().  Is it?  If so it would be interesting to disable
trinity's move_pages calls and see if it still fails.

Grasping at straws here, trying to reduce the amount of code to look at :(
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