linux-kernel - Re: [PATCH v3] x86/power: Fix 'nosmt' vs. hibernation triple fault during resume

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Date:   Wed, 29 May 2019 23:53:27 +0200
From:   Pavel Machek <pavel@....cz>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] x86/power: Fix 'nosmt' vs. hibernation triple fault
 during resume

On Wed 2019-05-29 23:27:34, Jiri Kosina wrote:
> On Wed, 29 May 2019, Pavel Machek wrote:
> 
> > > As explained in
> > > 
> > > 	0cc3cd21657b ("cpu/hotplug: Boot HT siblings at least once")
> > > 
> > > we always, no matter what, have to bring up x86 HT siblings during boot at
> > > least once in order to avoid first MCE bringing the system to its
> > > knees.
> > 
> > 
> > > Cc: stable@...r.kernel.org # v4.19+
> > > Debugged-by: Thomas Gleixner <tglx@...utronix.de>
> > > Fixes: 0cc3cd21657b ("cpu/hotplug: Boot HT siblings at least once")
> > > Signed-off-by: Jiri Kosina <jkosina@...e.cz>
> > 
> > Acked-by: Pavel Machek <pavel@....cz>
> > 
> > But I'm less sure if this is -stable material. Is reverting
> > 0cc3cd21657be04cb0559fe8063f2130493f92cf in -stable an option?
> 
> Well, without that commit, first MCE to come kills nosmt system.

...which is same situation 4.9-stable and 4.14-stable lives with for a
long long time, right?

But you are right, reverting 0cc3cd21657b does not look like good
option :-(.


									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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