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Date: Wed, 18 Dec 2013 19:46:53 +0400
From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Sasha Levin <sasha.levin@oracle.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>, khlebnikov@openvz.org,
        LKML <linux-kernel@vger.kernel.org>
Subject: Re: mm: kernel BUG at include/linux/swapops.h:131!
Message-ID: <20131218154653.GX8167@moon>
References: <52B1C143.8080301@oracle.com>
 <20131218154145.GW8167@moon>
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On Wed, Dec 18, 2013 at 07:41:45PM +0400, Cyrill Gorcunov wrote:
> On Wed, Dec 18, 2013 at 10:37:39AM -0500, Sasha Levin wrote:
> > Hi all,
> > 
> > While fuzzing with trinity inside a KVM tools guest running latest
> > -next kernel, I've stumbled on the following spew.
> > 
> > The code is in zap_pte_range():
> > 
> >                 if (!non_swap_entry(entry))
> >                         rss[MM_SWAPENTS]--;
> >                 else if (is_migration_entry(entry)) {
> >                         struct page *page;
> > 
> >                         page = migration_entry_to_page(entry);	<==== HERE
> > 
> >                         if (PageAnon(page))
> >                                 rss[MM_ANONPAGES]--;
> >                         else
> >                                 rss[MM_FILEPAGES]--;
> 
> This I think is my issue, I'll take a look, thanks Sasha!

Ah, no. I thought it somehow related to dirty tracking, but
it's not, different issue.