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

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Message-Id: <14EEE4A4-B2B1-4D0C-B2F6-BDB7C11B05DE@linux.vnet.ibm.com>
Date:   Mon, 21 Jun 2021 23:01:51 +0530
From:   Sachin Sant <sachinp@...ux.vnet.ibm.com>
To:     Vincent Guittot <vincent.guittot@...aro.org>
Cc:     Peter Zijlstra <peterz@...radead.org>, Odin Ugedal <odin@...d.al>,
        linuxppc-dev@...ts.ozlabs.org,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [powerpc][5.13.0-rc7] Kernel warning (kernel/sched/fair.c:401)
 while running LTP tests

>>> 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@surriel.com/
>> 
>> 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@...ux.vnet.ibm.com>
Tested-by: Sachin Sant <sachinp@...ux.vnet.ibm.com>

-Sachin