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

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Message-ID: <531F0E39.9020100@oracle.com>
Date:	Tue, 11 Mar 2014 09:23:05 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>, Dave Jones <davej@...hat.com>
CC:	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 03/11/2014 09:20 AM, Cyrill Gorcunov wrote:
> On Tue, Mar 11, 2014 at 01:30:17AM -0400, Dave Jones wrote:
>>   > >  >
>>   > >  > 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.
>>
>> Ok, with move_pages excluded it still oopses.
>
> Dave, is it possible to somehow figure out was someone reading pagemap file
> at moment of the bug triggering?

We can sprinkle printk()s wherever might be useful, might not be 100% accurate but
should be close enough to confirm/deny the theory.


Thanks,
Sasha

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