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

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Message-ID: <aBAWaAubkkTH9FAK@pop-os.localdomain>
Date: Mon, 28 Apr 2025 16:59:36 -0700
From: Cong Wang <xiyou.wangcong@...il.com>
To: "Alan J. Wylie" <alan@...ie.me.uk>
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 Mon, Apr 28, 2025 at 10:34:36PM +0100, Alan J. Wylie wrote:
> On Mon, 28 Apr 2025 14:02:20 -0700
> Cong Wang <xiyou.wangcong@...il.com> wrote:
> 
> > I doubt it is related to iptables. I will try some TCP traffic on my
> > side later, but I suspect this is related to the type of packets.
> > 
> > Meanwhile, since I still can't reproduce it here, do you mind applying
> > both of my patches on top of -net and test again?
> > 
[...] 
> 
> With those patches applied, I've run 5 or 6 SpeedTests, no panics.
> 
> There's several WARNINGS in the log, though, about one per run.

My bad, acctually I reproducced it with iperf (TCP traffic) using your
reproducer. I saw the warning/crash within 10 seconds. With the fix I
sent out, I didn't see any after ~10 mininutes, so it should be working 
probably.

Thanks!