linux-kernel - Re: 5.6-rc3: WARNING: CPU: 48 PID: 17435 at kernel/sched/fair.c:380 enqueue_task

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Date:   Fri, 28 Feb 2020 16:42:27 +0100
From:   Christian Borntraeger <borntraeger@...ibm.com>
To:     Vincent Guittot <vincent.guittot@...aro.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: 5.6-rc3: WARNING: CPU: 48 PID: 17435 at kernel/sched/fair.c:380
 enqueue_task_fair+0x328/0x440



On 28.02.20 16:37, Vincent Guittot wrote:
> On Fri, 28 Feb 2020 at 16:08, Christian Borntraeger
> <borntraeger@...ibm.com> 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?