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

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Message-ID: <20140319145200.GA4608@redhat.com>
Date:	Wed, 19 Mar 2014 10:52:00 -0400
From:	Dave Jones <davej@...hat.com>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	Sasha Levin <sasha.levin@...cle.com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org, Linus Torvalds <torvalds@...ux-foundation.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Bob Liu <bob.liu@...cle.com>,
	Konstantin Khlebnikov <koct9i@...il.com>
Subject: Re: bad rss-counter message in 3.14rc5

On Tue, Mar 18, 2014 at 07:19:09PM -0700, Hugh Dickins wrote:

 > Another positive on the rss counters, great, thanks Dave.
 > That encourages me to think again on the swapops BUG, but no promises.

So while I slept I ran a test kernel with that swapops BUG replaced with a printk.
I'm not sure of the validity of this, given the state of the kernel afterwards
is somewhat suspect, but I did see in the logs this morning..

[18728.075153] migration_entry_to_page BUG hit
[18728.200705] BUG: Bad rss-counter state mm:ffff880241b3f500 idx:0 val:1 (Not tainted)
[18728.200706] BUG: Bad rss-counter state mm:ffff880241b3f500 idx:1 val:-1 (Not tainted)

This might be collateral damage from the swapops thing, I guess we won't know until
that gets fixed, but I thought I'd mention that we might still have a problem here.

	Dave

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