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

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Date:	Mon, 23 Feb 2009 09:24:39 +0100
From:	Vegard Nossum <vegard.nossum@...il.com>
To:	paulmck@...ux.vnet.ibm.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)

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).


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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