netdev - Re: suspicious RCU usage in net/ipv4/ip

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Message-ID: <CAHA+R7N358TZyY9DGZbEQFV5aC08+ZYEaxJKOGPDDN58V4FQ=Q@mail.gmail.com>
Date:	Thu, 16 Jan 2014 16:26:15 -0800
From:	Cong Wang <cwang@...pensource.com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Tom Herbert <therbert@...gle.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: suspicious RCU usage in net/ipv4/ip_tunnel.c:80

On Mon, Jan 13, 2014 at 8:53 PM, Paul E. McKenney
<paulmck@...ux.vnet.ibm.com> wrote:
> OK, I'll bite...  This code invokes dst_release() which looks to me
> like it dereferences this pointer:
>

Yeah, sure, my point is it doesn't dereference the pointer when it holds
the spin_lock. I read rcu_dereference_protected() as "deference the rcu
pointer when we protected by ...", but we dereference it after the lock is
released. :)


@Eric, will you submit your patch as a formal one? I already tested it.

Thanks.
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