Re: [powerpc][5.13.0-rc7] Kernel warning (kernel/sched/fair.c:401) while running LTP tests

[Vincent Guittot]

On Mon, 21 Jun 2021 at 19:32, Sachin Sant <sachinp@xxxxxxxxxxxxxxxxxx> wrote:
>
> >>> Any thoughts Vincent?
> >>
> >>
> >> I would prefer that we use the reason of adding the cfs in the list instead.
> >>
> >> Something like the below should also fixed the problem. It is based on a
> >> proposal I made to Rik sometimes ago when he tried to flatten the rq:
> >> https://lore.kernel.org/lkml/20190906191237.27006-6-riel@xxxxxxxxxxx/
> >>
> >> This will ensure that a cfs is added in the list whenever one of its  child
> >> is still in the list.
> >
> > Could you confirm that this patch fixes the problem for you too ?
> >
> Thanks for the fix.
>
> The patch fixes the reported problem. The test ran to completion without
> any failure.
>
> Reported-by: Sachin Sant <sachinp@xxxxxxxxxxxxxxxxxx>
> Tested-by: Sachin Sant <sachinp@xxxxxxxxxxxxxxxxxx>

Thanks

>
> -Sachin
>