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From: Oleksandr Natalenko <>
To: "Toke Høiland-Jørgensen" <>
Cc: Dave Taht <>,
	"David S. Miller" <>,
	Jamal Hadi Salim <>,
	Cong Wang <>,
	Jiri Pirko <>,,
Subject: CAKE and r8169 cause panic on upload in v4.19
Date: Fri, 26 Oct 2018 21:26:12 +0200	[thread overview]
Message-ID: <> (raw)


I was excited regarding the fact that v4.19 introduced CAKE, so I've 
deployed it on my home router.

I used this script of mine [1]:

# bufferbloat enp3s0.100 20 20

to do its job on the VLAN interface, where 20/20 ISP link is switched 
from the home switch. Basically, it just follows [2] with simple 
bandwidth restriction and egress mirroring using ifb.

Then I thought it would be nice to run speedtest-cli on one of the 
computer in the home LAN, connected to this router. Download stage went 
fine, but immediately after upload started I've got a panic on the 
router: [3] (sorry, it is a photo, netconsole didn't work because, I 
assume, the panic happened in the networking code). I rebooted the 
router and tried once more, and got the same result, again during upload 
stage. Then I rebooted again, replaced CAKE script with my former HTB 
script, and after running speedtest-cli a couple of times there's no 

Before running speedtest-cli I was using CAKE for a couple of days 
without generating much traffic just fine. It seems it crashes only if 
lots of traffic is generated with tools like this.

My sysctl: [4] and ethtool -k: [5]

So far, I've found something similar only here: [6] [7]. The common 
thing is r8169 driver in use, so, maybe, it is a driver issue, and CAKE 
is just happy to reveal it.

If it is something known, please point me to a possible fix. If it is 
something new, I'm open to provide more info on your request, try 
patches etc (as usual).


   Oleksandr Natalenko (post-factum)


             reply	other threads:[~2018-10-26 19:26 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-26 19:26 Oleksandr Natalenko [this message]
2018-10-26 20:21 ` Heiner Kallweit
2018-10-26 20:25   ` Dave Taht
2018-10-26 20:54     ` Oleksandr Natalenko
2018-10-26 23:08       ` Dave Taht
2018-10-27 11:04         ` Oleksandr Natalenko
2018-10-27 13:43       ` Heiner Kallweit
2018-10-27 15:37         ` Oleksandr Natalenko
2018-10-28  4:44       ` David Miller
2018-10-28 12:22         ` Oleksandr Natalenko
2018-10-28 17:45           ` David Miller

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