From: "Holger Hoffstätte" <holger@applied-asynchrony.com>
To: "Alan J. Wylie" <alan@wylie.me.uk>,
"Jamal Hadi Salim" <jhs@mojatatu.com>,
regressions@lists.linux.dev,
"Cong Wang" <xiyou.wangcong@gmail.com>,
"Jiri Pirko" <jiri@resnulli.us>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
"Octavian Purdila" <tavip@google.com>,
"Toke Høiland-Jørgensen" <toke@redhat.com>,
stable@vger.kernel.org
Subject: Re: [REGRESSION] 6.14.3 panic - kernel NULL pointer dereference in htb_dequeue
Date: Mon, 21 Apr 2025 13:50:52 +0200 [thread overview]
Message-ID: <6fa68b02-cf82-aeca-56e6-e3b8565b22f4@applied-asynchrony.com> (raw)
In-Reply-To: <20250421104019.7880108d@frodo.int.wylie.me.uk>
On 2025-04-21 11:40, Alan J. Wylie wrote:
> #regzbot introduced: 6.14.2..6.14.3
>
> Since 6.14.3 I have been seeing random panics, all in htb_dequeue.
> 6.14.2 was fine.
6.14.3 contains:
"codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog()" aka
https://web.git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/net/sched?h=linux-6.14.y&id=a57fe60ef4cf96bfbb6b58397ec28bdb5a5c6b31
Is your HTB backed by fq_codel by any chance? 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/
Hope this helps. I am running fq_codel without issue but not behind htb.
cheers
Holger
next prev parent reply other threads:[~2025-04-21 11:51 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-21 9:40 [REGRESSION] 6.14.3 panic - kernel NULL pointer dereference in htb_dequeue Alan J. Wylie
2025-04-21 11:50 ` Holger Hoffstätte [this message]
2025-04-21 12:10 ` Alan J. Wylie
2025-04-21 19:06 ` Alan J. Wylie
2025-04-21 19:47 ` Holger Hoffstätte
2025-04-21 20:09 ` Alan J. Wylie
2025-04-22 16:51 ` Alan J. Wylie
2025-04-22 17:20 ` Holger Hoffstätte
2025-04-22 20:42 ` Cong Wang
2025-04-22 20:47 ` Alan J. Wylie
2025-04-22 21:49 ` Cong Wang
2025-04-23 9:51 ` Alan J. Wylie
2025-04-23 19:32 ` Cong Wang
2025-04-24 6:53 ` Alan J. Wylie
2025-04-24 12:53 ` Alan J. Wylie
2025-04-25 16:08 ` Cong Wang
2025-04-27 19:11 ` Cong Wang
2025-04-27 19:42 ` Alan J. Wylie
2025-04-27 20:35 ` Alan J. Wylie
2025-04-28 21:02 ` Cong Wang
2025-04-28 21:34 ` Alan J. Wylie
2025-04-28 23:59 ` Cong Wang
2025-04-28 11:45 ` Greg KH
2025-04-28 12:28 ` Holger Hoffstätte
2025-04-28 23:38 ` Cong Wang
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