linux-kernel - Re: WARNING at kernel/sched/core.c:2013 migration_cpu

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Date:   Mon, 16 Nov 2020 11:32:50 +0100
From:   Oleksandr Natalenko <oleksandr@...alenko.name>
To:     Valentin Schneider <valentin.schneider@....com>
Cc:     linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org
Subject: Re: WARNING at kernel/sched/core.c:2013
 migration_cpu_stop+0x2e3/0x330

On 16.11.2020 11:31, Valentin Schneider wrote:
> On 16/11/20 10:27, Oleksandr Natalenko wrote:
>> Hi.
> [...]
>> 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:
>> 
>> ```
>> [<0>] affine_move_task+0x2d3/0x620
>> [<0>] __set_cpus_allowed_ptr+0x164/0x210
>> [<0>] sched_setaffinity+0x21a/0x300
>> [<0>] __x64_sys_sched_setaffinity+0x8c/0xc0
>> [<0>] do_syscall_64+0x33/0x40
>> [<0>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>> ```
> [...]
>> 
>> I'm not positive about this being directly related to the original
>> report, but I think it is still worth mentioning.
>> 
> 
> Aye, thanks, that one should be fixed by:
> 
> https://lore.kernel.org/r/20201113112414.2569-1-valentin.schneider@arm.com

Great, thanks, I'll pick it up now.

> 
>> Thanks.
>> 
>> [1] https://gitlab.com/post-factum/burn_scheduler

-- 
   Oleksandr Natalenko (post-factum)