Alternative solution for problem found by Linux Driver Verification
project (linuxtesting.org).
As it noted in the comment before the br_handle_frame_finish
function, this function should be called under rcu_read_lock.
The problem callgraph:
br_dev_xmit -> br_nf_pre_routing_finish_bridge_slow ->
From: Stephen Hemminger
Date: Tue, 14 Aug 2012 08:19:33 -0700
> Alternative solution for problem found by Linux Driver Verification
> project (linuxtesting.org).
>
> As it noted in the comment before the br_handle_frame_finish
> function, this function should be called under rcu_read_lock.
>
>
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