linux-kernel - Re: [GIT pull] smp/hotplug: Removal of notifiers

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Message-ID: <20161226110600.GB297@x4>
Date:   Mon, 26 Dec 2016 12:06:00 +0100
From:   Markus Trippelsdorf <markus@...ppelsdorf.de>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Borislav Petkov <bp@...en8.de>
Subject: Re: [GIT pull] smp/hotplug: Removal of notifiers

On 2016.12.26 at 08:45 +0100, Markus Trippelsdorf wrote:
> On 2016.12.25 at 14:39 +0100, Thomas Gleixner wrote:
> > Linus,
> > 
> > please pull the latest smp-urgent-for-linus git tree from:
> > 
> >    git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git smp-urgent-for-linus
> > 
> > Thomas Gleixner (11):
> >       cpu/hotplug: Prevent overwriting of callbacks
> 
> The following commit:
> 
>  commit dc280d93623927570da279e99393879dbbab39e7
>  Author: Thomas Gleixner <tglx@...utronix.de>
>  Date:   Wed Dec 21 20:19:49 2016 +0100
> 
>      cpu/hotplug: Prevent overwriting of callbacks
> 
> results in an early OOPs during boot on my AMD machine.
> I haven't wrote down the entire backtrace, but basically things start to
> go wrong in mce_threshold_create_device() from
> arch/x86/kernel/cpu/mcheck/mce_amd.c.
> 
> # CONFIG_HOTPLUG_CPU is not set 
> 
> Reverting the commit "fixes" the issue for me.

CCing Sebastian and Borislav.

-- 
Markus