linux-kernel - Re: [PATCH] percpu_counter: fix CPU unplug race in percpu_counter

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Date:	Wed, 03 Dec 2008 22:13:23 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	dada1@...mosbay.com
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] percpu_counter: fix CPU unplug race in
 percpu_counter_destroy()

From: Eric Dumazet <dada1@...mosbay.com>
Date: Wed, 03 Dec 2008 19:40:07 +0100

> While working on percpu_counter on net-next-2.6, I found
> a CPU unplug race in percpu_counter_destroy()
> 
> (Very unlikely of course)
> 
> Thank you
> 
> [PATCH] percpu_counter: fix CPU unplug race in percpu_counter_destroy()
> 
> We should first delete the counter from percpu_counters list
> before freeing memory, or a percpu_counter_hotcpu_callback()
> could dereference a NULL pointer.
> 
> Signed-off-by: Eric Dumazet <dada1@...mosbay.com>

Acked-by: David S. Miller <davem@...emloft.net>
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