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

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Date:   Mon, 26 Dec 2016 19:21:44 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>
cc:     Markus Trippelsdorf <markus@...ppelsdorf.de>,
        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 Mon, 26 Dec 2016, Boris Ostrovsky wrote:
> On 12/26/2016 10:45 AM, Markus Trippelsdorf wrote:
> > The comment in arch/x86/kernel/cpu/mcheck/mce_amd.c says:
> >
> > 1384  * mcheck_init_device should be inited before threshold_init_device to
> > 1385  * initialize mce_device, otherwise a NULL ptr dereference will cause panic.

That's not changed by this commit.

> My nightly test hit this as well. AMD only, Intel passed. I haven't
> verified whether commit that Markus implicated is the one that caused
> this but it's the same BUG signature (but possibly slightly different stack)
> 
> [    1.554351] smpboot: CPU0: AMD Engineering Sample (family: 0x10,
> model: 0x4, stepping: 0x1)
> ...

Is there anything interesting error message before the BUG hits? I'll try
to reproduce on a AMD box tomorrow.

Thanks,

	tglx