netdev - Re: [Patch net 00/16] net_sched: fix races with RCU callbacks

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Date:   Tue, 31 Oct 2017 07:00:22 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Cong Wang <xiyou.wangcong@...il.com>,
        Lucas Bates <lucasb@...atatu.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Chris Mi <chrism@...lanox.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jiri Pirko <jiri@...nulli.us>,
        John Fastabend <john.fastabend@...il.com>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [Patch net 00/16] net_sched: fix races with RCU callbacks

On 17-10-31 01:44 AM, Cong Wang wrote:
> On Mon, Oct 30, 2017 at 6:03 PM, Lucas Bates <lucasb@...atatu.com> wrote:
>> On Oct 30, 2017 19:13, "Cong Wang" <xiyou.wangcong@...il.com> wrote:
>>>

> Can you try this patch? From your stack trace it is not clear where
> the cause is, but we know that the crash is in __tcf_idr_release(),
> this is how I came up with the following patch:
> 
> 
> diff --git a/include/net/act_api.h b/include/net/act_api.h
> index b944e0eb93be..5072446d5f06 100644
> --- a/include/net/act_api.h
> +++ b/include/net/act_api.h
> @@ -122,7 +122,9 @@ void tcf_idrinfo_destroy(const struct tc_action_ops *ops,
> 
>   static inline void tc_action_net_exit(struct tc_action_net *tn)
>   {
> +       rtnl_lock();
>          tcf_idrinfo_destroy(tn->ops, tn->idrinfo);
> +       rtnl_unlock();
>          kfree(tn->idrinfo);
>   }
> 
>

Looks like an excellent bet;-> tdc kills the container at the end of the
test.

cheers,
jamal