netdev - Re: WARNING: CPU: 3 PID: 0 at net/sched/sch_hfsc.c:1388 hfsc_dequeue+0x319/0x350 [sch

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Message-ID: <11d36e94-0b07-425d-78d1-dd41b60a586f@mojatatu.com>
Date:   Mon, 19 Mar 2018 06:07:40 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Cong Wang <xiyou.wangcong@...il.com>,
        Marco Berizzi <pupilla@...ero.it>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: WARNING: CPU: 3 PID: 0 at net/sched/sch_hfsc.c:1388
 hfsc_dequeue+0x319/0x350 [sch_hfsc]

On 18-03-15 08:48 PM, Cong Wang wrote:
> On Wed, Mar 14, 2018 at 1:10 AM, Marco Berizzi <pupilla@...ero.it> wrote:
>>> Il 9 marzo 2018 alle 0.14 Cong Wang <xiyou.wangcong@...il.com> ha scritto:
>>>
>>>
>>> On Thu, Mar 8, 2018 at 8:02 AM, Marco Berizzi <pupilla@...ero.it> wrote:
>>>>> Marco Berizzi wrote:
>>>>>
>>>>>
>>>>> Hello everyone,
>>>>>
>>>>> Yesterday I got this error on a slackware linux 4.16-rc4 system
>>>>> running as a traffic shaping gateway and netfilter nat.
>>>>> The error has been arisen after a partial ISP network outage,
>>>>> so unfortunately it will not trivial for me to reproduce it again.
>>>>
>>>> Hello everyone,
>>>>
>>>> I'm getting this error twice/day, so fortunately I'm able to
>>>> reproduce it.
>>>
>>> IIRC, there was a patch for this, but it got lost...
>>>
>>> I will take a look anyway.
>>
>> ok, thanks for the response. Let me know when there will be a patch
>> available to test.
> 
> It has been reported here:
> https://bugzilla.kernel.org/show_bug.cgi?id=109581
> 
> And there is a workaround from Konstantin:
> https://patchwork.ozlabs.org/patch/803885/
> 
> Unfortunately I don't think that is a real fix, we probably need to
> fix HFSC itself rather than just workaround the qlen==0. It is not
> trivial since HFSC implementation is not easy to understand.
> Maybe Jamal knows better than me.
> 

Sorry for the latency - I looked at this on the plane and it is very
specific to fq/codel. It is not clear to me why codel needs this but
i note it has been there from the initial commit and from that
perspective the patch looks reasonable. In any case:
Punting it to Eric (on Cc).

cheers,
jamal
> Thanks
>