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

[Cong Wang]

On Thu, Apr 24, 2025 at 01:53:31PM +0100, Alan J. Wylie wrote:
> > On Tue, Apr 22, 2025 at 07:20:24PM +0200, Holger Hoffstätte wrote:
> 
> > Meanwhile, if you could provide a reliable (and ideally minimum)
> > reproducer, it would help me a lot to debug.
> 
> I've found a reproducer. Below is a stripped down version of the shell script
> that I posted in my initial report.
> 
> Running this in a 1 second loop is enough to cause the panic very quickly.
> 
> It seems a bit of network traffic is needed, too.

Excellent! Now I can try it on my side instead of bothering you. :)

I will check if applying all patches here could make crash and warning
go away. And of course, I need to really understand why the crash still
happened even after the qlen check adding to htb_qlen_notify(), which is
unexpected to me.

Thanks a lot!