Re: 5.6-rc3: WARNING: CPU: 48 PID: 17435 at kernel/sched/fair.c:380 enqueue_task_fair+0x328/0x440

[Christian Borntraeger]

On 28.02.20 16:37, Vincent Guittot wrote:
> On Fri, 28 Feb 2020 at 16:08, Christian Borntraeger
> <borntraeger@xxxxxxxxxx> wrote:
>>
>> Also happened with 5.4:
>> Seems that I just happen to have an interesting test workload/system size interaction
>> on a newly installed system that triggers this.
> 
> you will probably go back to 5.1 which is the version where we put
> back the deletion of unused cfs_rq from the list which can trigger the
> warning:
> commit 039ae8bcf7a5 : (Fix O(nr_cgroups) in the load balancing path)
> 
> AFAICT, we haven't changed this since

So you do know what is the problem? If not is there any debug option or
patch that I could apply to give you more information?