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, 22 Mar 2018 15:12:49 +0100 (CET)
From:   Marco Berizzi <pupilla@...ero.it>
To:     Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>
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]

Il 19 marzo 2018 alle 11.07 Jamal Hadi Salim <jhs@...atatu.com> ha scritto:
> 
> 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).

Hello everyone,

just for ask: it there any luck to get this patch before 4.16 final?