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

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Message-ID: <c2b3ff55-7636-4b38-ca06-54d5ff75f4bf@mojatatu.com>
Date:   Tue, 6 Dec 2016 08:50:18 -0500
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Feng Deng <cxdx2006@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        feng.deng@...tina-access.com, Roman Mashak <mrv@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>
Subject: Re: [PATCH]net:sched:release lock before tcf_dump_walker() normal
 return to avoid deadlock

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?

cheers,
jamal