netdev - Re: [REGRESSION] 6.14.3 panic - kernel NULL pointer dereference in htb

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Message-ID: <20250427213548.73efc7b9@frodo.int.wylie.me.uk>
Date: Sun, 27 Apr 2025 21:35:48 +0100
From: "Alan J. Wylie" <alan@...ie.me.uk>
To: Cong Wang <xiyou.wangcong@...il.com>
Cc: Holger Hoffstätte <holger@...lied-asynchrony.com>,
 Jamal Hadi Salim <jhs@...atatu.com>, regressions@...ts.linux.dev, Jiri
 Pirko <jiri@...nulli.us>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, Octavian Purdila <tavip@...gle.com>, Toke
 Høiland-Jørgensen <toke@...hat.com>,
 stable@...r.kernel.org, Greg KH <gregkh@...uxfoundation.org>
Subject: Re: [REGRESSION] 6.14.3 panic - kernel NULL pointer dereference in
 htb_dequeue

On Sun, 27 Apr 2025 20:42:54 +0100
"Alan J. Wylie" <alan@...ie.me.uk> wrote:

> That would be https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/ ?
> 
> I've just cloned that. I'll do a build and a test.

$ uname -r
6.15.0-rc3-00109-gf73f05c6f711

It's crashed. Same place as usual. I tried again, same thing.

 htb_dequeue+0x42e/0x610 [sch_htb]

Rather than a ping flood, I was running a Speedtest. Both times it
crashed during the upload test, not the download.

https://www.speedtest.net/

Could running an iptables firewall perhaps have anything to do with it?

HTH
Alan

-- 
Alan J. Wylie     https://www.wylie.me.uk/     mailto:<alan@...ie.me.uk>

Dance like no-one's watching. / Encrypt like everyone is.
Security is inversely proportional to convenience