Re: [netdev] htb_qlen_notify warning triggered after qdisc_tree_reduce_backlog change

[Ilya Maximets]

On 8/8/25 10:29 PM, Jakub Kicinski wrote:
> On Wed, 6 Aug 2025 08:29:34 +0000 He, Guocai (CN) wrote:
>> ### Environment
>> - Kernel version: 5.15.189-rt76-yocto-preempt-rt
>> - Open vSwitch version: 2.17.9
>     
>> ### Issue
>> After applying the QoS configuration, the following warning appears in dmesg:
>> [73591.168117] WARNING: CPU: 6 PID: 61296 at net/sched/sch_htb.c:609 htb_qlen_notify+0x3a/0x40 [sch_htb]
> 
> Is the issue easily reproducible ?
> Could you try your reproducer on the latest upstream kernel ?

FWIW, the issue is likely the same as this one:
  https://lore.kernel.org/netdev/779ce04d-2053-4196-b989-f801720e65bc@xxxxxxxxxx/
Caused by missing backports in the 5.15 tree.

Best regards, Ilya Maximets.