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Subject: Re: tip.today - scheduler  bam boom crash (cpu hotplug)
From: Mike Galbraith <efault@gmx.de>
To: Peter Zijlstra <peterz@infradead.org>
Cc: LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>,
        Thomas Gleixner <tglx@linutronix.de>
Date: Thu, 19 Jan 2017 12:39:06 +0100
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On Thu, 2017-01-19 at 11:19 +0100, Peter Zijlstra wrote:

> OK, you also forgot to tell what you did to trigger this, but a little
> playing around seems enough to reproduce. All that was required was
> offline + online and *boom*.

Oh, sorry, it was Steven's hotplug stress script.  I thought the first
couple lines of kernel output (+$subject) told the tale.