netdev - Re: [PATCH]net:sched:release lock before tcf_dump_walker() normal return to avoid deadlock

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Message-ID: <CAM_iQpWHYszm0AEdxQJmn6M3rfDGTZkN0+aJNkS9Za1oP8H+xw@mail.gmail.com>
Date:   Tue, 6 Dec 2016 16:10:08 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Jamal Hadi Salim <jhs@...atatu.com>
Cc:     Feng Deng <cxdx2006@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        feng.deng@...tina-access.com, Roman Mashak <mrv@...atatu.com>
Subject: Re: [PATCH]net:sched:release lock before tcf_dump_walker() normal
 return to avoid deadlock

On Tue, Dec 6, 2016 at 5:50 AM, Jamal Hadi Salim <jhs@...atatu.com> wrote:
> On 16-12-06 12:36 AM, Feng Deng wrote:
>>
>> From: Feng Deng<cxdx2006@...il.com>
>>
>> release lock before tcf_dump_walker() normal return to avoid deadlock
>>
>
> /Scratching my head.
>
> I am probably missing something obvious.
> What are the condition under which this deadlock will happen?
> Do you have a testcase we can try?

I don't even see a patch (tried Google too).