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

["Holger Hoffstätte" <holger@applied-asynchrony.com>]

On 2025-04-21 21:06, Alan J. Wylie wrote:
> On Mon, 21 Apr 2025 13:10:00 +0100
> "Alan J. Wylie" <alan@wylie.me.uk> wrote:
> 
>> On Mon, 21 Apr 2025 13:50:52 +0200
>> Holger Hoffstätte <holger@applied-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@gmail.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