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

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Message-ID: <89301960-1758-5b2e-6d91-81ef06843e14@applied-asynchrony.com>
Date: Mon, 21 Apr 2025 21:47:44 +0200
From: Holger Hoffstätte <holger@...lied-asynchrony.com>
To: "Alan J. Wylie" <alan@...ie.me.uk>
Cc: Jamal Hadi Salim <jhs@...atatu.com>, regressions@...ts.linux.dev,
 Cong Wang <xiyou.wangcong@...il.com>, 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
Subject: Re: [REGRESSION] 6.14.3 panic - kernel NULL pointer dereference in
 htb_dequeue

On 2025-04-21 21:06, Alan J. Wylie wrote:
> On Mon, 21 Apr 2025 13:10:00 +0100
> "Alan J. Wylie" <alan@...ie.me.uk> wrote:
> 
>> On Mon, 21 Apr 2025 13:50:52 +0200
>> Holger Hoffstätte <holger@...lied-asynchrony.com> wrote:
> 
>>> If so, try either reverting the above or adding:
>>> "sch_htb: make htb_qlen_notify() idempotent" aka
>>> https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5ba8b837b522d7051ef81bacf3d95383ff8edce5
>>>
>>> which was successfully not added to 6.14.3, along with the rest of
>>> the series:
>>> https://lore.kernel.org/all/20250403211033.166059-2-xiyou.wangcong@gmail.com/
>>
>> "successfully not added"?
>>
>> $ git cherry-pick  5ba8b837b522d7051ef81bacf3d95383ff8edce5
>> [linux-6.14.y 2285c724bf7d] sch_htb: make htb_qlen_notify() idempotent
>>   Author: Cong Wang <xiyou.wangcong@...il.com>
>>   Date: Thu Apr 3 14:10:23 2025 -0700
>>   1 file changed, 2 insertions(+)
>>
>> It will take a while (perhaps days?) before I can confirm success.
> 
> I'm afraid that didn't help. Same panic.

Bummer :-(

Might be something else missing then - so for now the only other thing
I'd suggest is to revert the removal of the qlen check in fq_codel.

Holger