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Date: Sat, 22 Oct 2016 12:00:03 +0200
From: Greg KH <gregkh@linuxfoundation.org>
To: Edivaldo de Araujo Pereira <edivaldoapereira@gmail.com>
Cc: stable@vger.kernel.org
Subject: Re: Handle non enumerated CPU after physical hotplug
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On Fri, Oct 21, 2016 at 01:25:09PM -0200, Edivaldo de Araujo Pereira wrote:
> Dear friends,
> 
> I use to run some experiments to test each new kernel version, and
> noticed that commit 2a51fe083eba7f99cbda72f5ef90cdf2f4df882c have
> disrupted my tests. When I run a qemu/kvm guest with "-no-acpi", or
> boot with "noacpi" or "acpi=off", the guest cannot boot, but stays
> apparently in a infinite loop, usin 100% of cpu.
> I reversed the patch, my experiments run smoothly again.

Odd.  Care to cc: all of the people involved in that patch as well?
Also, is this still an issue with Linus's tree?

thanks,

greg k-h