linux-kernel - Re: Dell XPS13: MCE (Hardware Error) reported

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Message-ID: <20170105232800.GA82321@otc-brkl-03>
Date:   Thu, 5 Jan 2017 15:28:00 -0800
From:   "Raj, Ashok" <ashok.raj@...el.com>
To:     Borislav Petkov <bp@...e.de>
Cc:     Alexander Alemayhu <alexander@...mayhu.com>,
        Daniel J Blueman <daniel@...ra.org>,
        Paul Menzel <pmenzel@...gen.mpg.de>, tony.luck@...el.com,
        linux@...mhuis.info, len.brown@...el.com,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        ashok.raj@...el.com
Subject: Re: Dell XPS13: MCE (Hardware Error) reported

Hi Boris

On Thu, Jan 05, 2017 at 09:31:47PM +0100, Borislav Petkov wrote:
> On Thu, Jan 05, 2017 at 09:10:34PM +0100, Alexander Alemayhu wrote:
> > Not sure if it is related, but I am also seeing those messages on my
> > MacBookPro11,3:
> 
> Yours look to me like thermal throttling MCEs. And TBH we whould
> not issue those as actual MCEs because they are not - they *signal*
> overheating condition only and should be handled differently.

After looking at the code, seems like these events are logged as MCE's
but are really picked from real lvt thermal event interrupts.  via a fake
bank 128 for MCE_THERMAL. These are not really HW MCE's, but fake ones created 
and logged as mcelog entries. (arch/x86/kernel/cpu/mcheck/therm_throt.c)