From mboxrd@z Thu Jan  1 00:00:00 1970
From: Cong Wang <xiyou.wangcong@gmail.com>
Subject: Re: [PATCH nf-next] netns: add and use net_ns_barrier
Date: Mon, 12 Jun 2017 14:47:50 -0700
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Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
        netfilter-devel@vger.kernel.org,
        Linux Kernel Network Developers <netdev@vger.kernel.org>
To: Florian Westphal <fw@strlen.de>
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On Thu, Jun 1, 2017 at 1:52 AM, Florian Westphal <fw@strlen.de> wrote:
> Joe described it nicely, problem is that after unload we may have
> conntracks that still have a nf_conn_help extension attached that
> has a pointer to a structure that resided in the (unloaded) module.

Why not hold a refcnt for its module?