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

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Date:	Tue, 18 Mar 2014 21:32:36 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Hugh Dickins <hughd@...gle.com>, Dave Jones <davej@...hat.com>
CC:	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 03/18/2014 08:38 PM, Hugh Dickins wrote:
> On Tue, 11 Mar 2014, Dave Jones wrote:
>> On Tue, Mar 11, 2014 at 09:36:03PM +0400, Cyrill Gorcunov wrote:
>>   > On Tue, Mar 11, 2014 at 01:10:45PM -0400, Dave Jones wrote:
>>   > >  >
>>   > >  > Dave, iirc trinity can write log file pointing which exactly syscall sequence
>>   > >  > was passed, right? Share it too please.
>>   > >
>>   > > Hm, I may have been mistaken, and the damage was done by a previous run.
>>   > > I went from being able to reproduce it almost instantly to now not being able
>>   > > to reproduce it at all.  Will keep trying.
>>   >
>>   > Sasha already gave a link to the syscalls sequence, so no rush.
>>
>> It'd be nice to get a more concise reproducer, his list had a little of everything in there.
>
> I've so far failed to find any explanation for your swapops.h BUG;
> but believe I have identified one cause for "Bad rss-counter"s.
>
> My hunch is that the swapops.h BUG is "nearby", but I just cannot
> fit it together (the swapops.h BUG comes when rmap cannot find all
> all the migration entries it inserted earlier: it's a very useful
> BUG for validating rmap).
>
> Untested patch below: I can't quite say Reported-by, because it may
> not even be one that you and Sasha have been seeing; but I'm hopeful,
> remap_file_pages is in the list.
>
> Please give this a try, preferably on 3.14-rc or earlier: I've never
> seen "Bad rss-counter"s there myself (trinity uses remap_file_pages
> a lot more than most of us); but have seen them on mmotm/next, so
> some other trigger is coming up there, I'll worry about that once
> it reaches 3.15-rc.

The patch fixed the "Bad rss-counter" errors I've been seeing both in
3.14-rc7 and -next.


Thanks,
Sasha

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