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

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Date:   Thu, 15 Mar 2018 17:48:00 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Marco Berizzi <pupilla@...ero.it>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Jamal Hadi Salim <jhs@...atatu.com>
Subject: Re: WARNING: CPU: 3 PID: 0 at net/sched/sch_hfsc.c:1388
 hfsc_dequeue+0x319/0x350 [sch_hfsc]

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.


Thanks