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

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Message-ID: <jhjzh3hwq33.mognet@arm.com>
Date:   Mon, 16 Nov 2020 10:31:12 +0000
From:   Valentin Schneider <valentin.schneider@....com>
To:     Oleksandr Natalenko <oleksandr@...alenko.name>
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 16/11/20 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

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