linux-kernel - Re: [PREEMPT-RT] Oops in rapl_cpu

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Date:   Wed, 2 Nov 2016 18:23:28 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     "M. Vefa Bicakci" <m.v.b@...box.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Charles (Chas) Williams" <ciwillia@...cade.com>
Subject: Re: [PREEMPT-RT] Oops in rapl_cpu_prepare()

On 2016-11-01 13:15:53 [+0300], M. Vefa Bicakci wrote:
> Hello Sebastian,
Hi,

> The patch fixes the kernel oops for me.
> 
> I am using a custom 4.8.5-based kernel on Qubes OS R3.2, which is based
> on Xen 4.6.3. Apparently, Xen also has a similar bug/flaw/quirk regarding
> the allocation of package identifiers for the virtual CPUs.
> 
> Prior to your patch, my Xen-based virtual machines would intermittently
> crash most of the time at boot-up with the backtrace reported by Charles.
> Due to this, I was under the impression that this is a subtle race
> condition.

how hard is it to get such a xen setup up and running?

Sebastian