Bug#824790: linux-image-4.5.0-1-amd64: lots of WARNINGs in hfsc_dequeue+0x300/0x320 when using sch_hfsc+sch_codel
- To: Mirek Kratochvil <exa.exa@gmail.com>, 824790@bugs.debian.org
- Subject: Bug#824790: linux-image-4.5.0-1-amd64: lots of WARNINGs in hfsc_dequeue+0x300/0x320 when using sch_hfsc+sch_codel
- From: Salvatore Bonaccorso <carnil@debian.org>
- Date: Sun, 9 May 2021 21:33:15 +0200
- Message-id: <YJg4+7ybuM3T/OBF@eldamar.lan>
- Reply-to: Salvatore Bonaccorso <carnil@debian.org>, 824790@bugs.debian.org
- In-reply-to: <146368516613.28375.4352859093075995283.reportbug@shaperd-rych2>
- References: <146368516613.28375.4352859093075995283.reportbug@shaperd-rych2> <146368516613.28375.4352859093075995283.reportbug@shaperd-rych2>
Source: linux
Source-Version: 4.18~rc3-1~exp1
On Thu, May 19, 2016 at 09:12:46PM +0200, Mirek Kratochvil wrote:
> Package: src:linux
> Version: 4.5.1-1
> Severity: normal
> Tags: upstream
>
> Dear Maintainer,
>
> When attaching a codel or fq_codel qdisc to a leaf hfsc class, sometimes a
> bunch of warnings (dmesg attached) show up. That would not be a problem, but
> the warnings seem to be triggered for each packet for some time, and as a side
> situation the processing renders the system more or less unresponsive for
> several seconds (which may be a problem for QoS machine).
>
> A bug that is probably related (but concerning hfsc+sfq) is #631945 , my
> configuration is mostly the same, except with codel instead of SFQ. No similar
> fix exists for codel.
>
> When trying to rule out the causes, I found that the amount of traffic doesn't
> matter (the machine is currently processing around 1Gbit/s). fq_codel shows the
> same behavior, no other qdisc I tested causes the warnings.
>
> I hope someone could point out what's wrong with codel, if I see the cause I
> can write/send a patch to upstream.
This issue appears to have been fixed in 4.18-rc3 upstream. Closing
accordingly.
Regards,
Salvatore
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