linux-kernel - Re: a whole bunch of crashes since todays -mm merge.

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Message-ID: <20120608011215.GB7191@redhat.com>
Date:	Thu, 7 Jun 2012 21:12:15 -0400
From:	Dave Jones <davej@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: a whole bunch of crashes since todays -mm merge.

On Thu, Jun 07, 2012 at 06:06:27PM -0700, Linus Torvalds wrote:
 > On Thu, Jun 7, 2012 at 6:00 PM, Dave Jones <davej@...hat.com> wrote:
 > >
 > > Or I might just be getting lucky..
 > 
 > Do you have SPLIT_RSS_COUNTING enabled?

I don't think so ? I have CONFIG_SPLIT_PTLOCK_CPUS=999999,
so it looks like that never gets defined unless I'm missing something obvious.
 
 > Do you see multiple "BUG: Bad rss-counter state" messages?

no
 
 > The sync_mm_rss() thing could basically overwrite an already-free'd
 > piece of memory, so it could cause pretty random stuff. But I think
 > you need to be unlucky to hit the window.

the 8169 debug stuff I was trying to run used the function tracer. Could that have
widened the window ?

	Dave

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