linux-kernel - Re: [PATCH v4 11/19] sched/core: Make migrate disable and CPU hotplug cooperative

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Date:   Tue, 08 Dec 2020 08:46:23 -0500
From:   Qian Cai <qcai@...hat.com>
To:     Valentin Schneider <valentin.schneider@....com>
Cc:     Peter Zijlstra <peterz@...radead.org>, tglx@...utronix.de,
        mingo@...nel.org, linux-kernel@...r.kernel.org,
        bigeasy@...utronix.de, qais.yousef@....com, swood@...hat.com,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, bristot@...hat.com, vincent.donnefort@....com,
        tj@...nel.org, ouwen210@...mail.com
Subject: Re: [PATCH v4 11/19] sched/core: Make migrate disable and CPU
 hotplug cooperative

On Mon, 2020-12-07 at 19:27 +0000, Valentin Schneider wrote:
> Ok, can reproduce this on a TX2 on next-20201207. I didn't use your config,
> I oldconfig'd my distro config and only modified it to CONFIG_PREEMPT_NONE.
> Interestingly the BUG happens on CPU127 here too...

I think that number is totally random. For example, on this x86, it could happen
for CPU8 or CPU111.