On Thu, Apr 06, 2017 at 07:09:09PM +0800, gfree.w...@foxmail.com wrote:
> From: Gao Feng <f...@ikuai8.com>
> 
> The function ctnl_untimeout is used to untimeout every conntrack
> which is using the timeout. But it is necessary to add one barrier
> synchronize_rcu because of racing. Maybe one conntrack has already
> owned this timeout, but it is not inserted into unconfirmed list or
> the hash list, when ctnl_untimeout untimeout the conntracks

This object is released via kfree_rcu().

You have to describe better the race scenario.
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