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Date:   Mon, 16 Nov 2020 11:31:53 +0100
From:   Oleksandr Natalenko <oleksandr@natalenko.name>
To:     Valentin Schneider <valentin.schneider@arm.com>
Cc:     linux-rt-users@vger.kernel.org, linux-kernel@vger.kernel.org,
        tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org
Subject: Re: WARNING at kernel/sched/core.c:2013
 migration_cpu_stop+0x2e3/0x330
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On 16.11.2020 11:27, Oleksandr Natalenko wrote:
> Not sure whether the check is legitimate, but FWIW I've managed to put
> a test task [1] (it spawns a lot of threads and applies affinity) into
> a permanent unkillable D state here:

Just to make it clear: I neither applied your patch nor saw a splat this 
time, just a D state only.

-- 
   Oleksandr Natalenko (post-factum)