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Subject: Re: [GIT pull] smp/hotplug: Removal of notifiers
To: Thomas Gleixner <tglx@linutronix.de>
References: <alpine.DEB.2.20.1612251431340.3605@nanos>
 <20161226074530.GA297@x4> <20161226110600.GB297@x4> <20161226154502.GA287@x4>
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 <alpine.DEB.2.20.1612261918360.3605@nanos>
Cc: Markus Trippelsdorf <markus@trippelsdorf.de>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@kernel.org>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        Borislav Petkov <bp@alien8.de>
From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Message-ID: <1c76c271-8e04-ddb5-ab4f-c8a0fe99c23f@oracle.com>
Date: Mon, 26 Dec 2016 15:53:08 -0500
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On 12/26/2016 01:21 PM, Thomas Gleixner wrote:
> 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.


Nothing that caught my eye. I can post it tomorrow if you are still 
interested.

-boris