Messages in this thread | | | Date | Fri, 26 Oct 2018 21:26:12 +0200 | From | Oleksandr Natalenko <> | Subject | CAKE and r8169 cause panic on upload in v4.19 |
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Hello.
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 panic.
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).
Thanks.
-- Oleksandr Natalenko (post-factum)
[1] https://gist.github.com/4b27c49a7f9b4d775e2e38ba23d3f13c [2] https://www.bufferbloat.net/projects/codel/wiki/Cake [3] https://bit.ly/2SlUl7R [4] https://gist.github.com/pfactum/bdad2594b151578f460857cacd94c689 [5] https://gist.github.com/pfactum/cad2cc5d1512b31fbc76d821b3e63dbf [6] https://boards.4chan.org/g/thread/68171835#p68188019 [7] https://i.4cdn.org/g/1540307271879.jpg
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