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Date: Thu, 07 Jul 2011 04:01:49 -0700 (PDT)
Message-Id: <20110707.040149.441417258943576903.davem@davemloft.net>
To: mashirle@us.ibm.com
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        linux-kernel@vger.kernel.org
Subject: Re: [PATCH V8 2/4 net-next] skbuff: skb supports zero-copy buffers
From: David Miller <davem@davemloft.net>
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From: Shirley Ma <mashirle@us.ibm.com>
Date: Wed, 06 Jul 2011 15:22:12 -0700

> +			while (head) {
> +				put_page(head);
> +				head = (struct page *)head->private;
> +			}

Looks like you might be referencing the page after it's
release here.  I think you need something like:

			while (head) {
				struct page *next = (struct page *)head->private;
				put_page(head);
				head = next;
			}