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Date:   Tue, 28 Feb 2017 13:29:17 -0800
From:   Cong Wang <>
To:     颜小波 <>
Cc:     Stephen Hemminger <>,
        Linux Kernel Network Developers <>
Subject: Re: [drivers/net/vxlan]Why rcu_read_lock is not obtained before
 rculist travelling

On Tue, Feb 28, 2017 at 6:03 AM, 颜小波 <> wrote:
> But I don’t find any rcu_read_lock invoked before travelling fdb_head list.  In vxlan_xmit and vxlan_snoop function, vxlan_find_mac function is called to search the vxlan_fdb of the dst_mac or src_mac. Then information in vxlan_fdb  is used for further process.  But as no rcu_read_lock is obtained before the list travelling, I am wondering if it is possible that vxlan_fdb is freed when it is being used.

In both RX and TX paths, rcu read lock is acquired by upper layer.
Check __dev_queue_xmit() and process_backlog().

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