Re: [Linux 5.18-rc1] WARNING: CPU: 1 PID: 0 at kernel/sched/fair.c:3355 update_blocked_averages

[Dietmar Eggemann]

On 08/04/2022 08:03, Ammar Faizi wrote:
> On 4/7/22 5:52 PM, Dietmar Eggemann wrote:
> 
> [...]
> 
>> Looks like 21.10 finally abandoned legacy cgroup v1 and switched to v2
>> completely, which is now mounted under /sys/fs/cgroup .
>>
>> So your /sys/fs/cgroup/cgroup.controllers should contain `cpu`.
>>
>> Can you check if any of the cpu.max files under /sys/fs/cgroup has
>> something else then `max 100000` ?
> 
> I only see "max 100000" at the moment. Not sure if it may change when I
> do other activities anyway. If you need more information, I can always
> send it, so feel free to ask.

Looks like you saw the same issue which got fixed here:

https://lkml.kernel.org/r/20220414015940.9537-1-kuyo.chang@xxxxxxxxxxxx

So nothing to do with CFS BW control. It's triggered by a task with very
low nice value and load_avg=1 during cfs_rq attach.