linux-kernel - Re: [PATCH] mm: fix lazy vmap purging (use-after-free error)

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Date:	Mon, 23 Feb 2009 07:39:17 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Vegard Nossum <vegard.nossum@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, stable@...nel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>,
	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: fix lazy vmap purging (use-after-free error)

On Mon, Feb 23, 2009 at 09:24:39AM +0100, Vegard Nossum wrote:
> 2009/2/23 Paul E. McKenney <paulmck@...ux.vnet.ibm.com>:
> > Hello, Vegard,
> >
> > Could you please try out the following patch?  I am not 100% confident
> > of it on non-x86 architectures, nor during the time that non-boot CPUs
> > start up (though this patch should not break non-boot CPUs any more than
> > they might already be broken).
> 
> Hi!
> 
> This patch fixes it for me. Now I see the huge stream of call_rcu()s,
> followed by a huge stream of kfrees() (after the list traversal has
> completed).

Much better!!!  Thank you for checking this out!  To say nothing of all
your work finding and isolating the problem!

							Thanx, Paul
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