netdev - AW: RFH, where did I go wrong?

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Message-ID: <FR2P281MB29597303CA232BBEF6E328DF90479@FR2P281MB2959.DEUP281.PROD.OUTLOOK.COM>
Date:   Tue, 13 Sep 2022 06:39:38 +0000
From:   <Haye.Haehne@...ekom.de>
To:     <t.glaser@...ent.de>, <ryazanov.s.a@...il.com>
CC:     <netdev@...r.kernel.org>
Subject: AW: RFH, where did I go wrong?

Hi,
I could retest the crash scenario of the qdisc, it occurs in the context of tc change /reconfiguration.
When I define a static qdisc setup, the iperf udp stream with 50M (qdisc rate 20M) is stable.
So you should indeed take a deeper look into the processing during reconfiguration.
Kind regards, Haye

-----Ursprüngliche Nachricht-----
Von: Thorsten Glaser <t.glaser@...ent.de> 
Gesendet: Sonntag, 11. September 2022 01:44
An: Hähne, Haye <Haye.Haehne@...ekom.de>; Sergey Ryazanov <ryazanov.s.a@...il.com>
Cc: netdev@...r.kernel.org
Betreff: Re: RFH, where did I go wrong?

Hi Sergey,

> BTW, the stack backtrace contains only RTNL related functions. Does 
> this warning appear when trying to reconfigure the qdisc? If so, then 
> the error is probably somewhere in the qdisc configuration code. Such

good point. The qdisc is used in a mode where it’s reconfigured multiple times per second, although I do not know if my colleague used it like this or if the issue also happens when statically configuring.

@Haye: does it also crash for you if you don’t run the playlist but just configure the qdisc with just the tc qdisc add … rate 20m command?

I did not have access to my test VM until today, so I’ll be able to look into this more next week.

Thanks,
//mirabilos
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