linux-kernel - Re: PROBLEM: mce: [Hardware Error] from dmesg -l emerg

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Message-ID: <20180522083456.GA5512@pd.tnic>
Date:   Tue, 22 May 2018 10:34:56 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     "Luck, Tony" <tony.luck@...el.com>
Cc:     Jeffrin Thalakkottoor <jeffrin@...agiritech.edu.in>,
        Thomas Gleixner <tglx@...utronix.de>, mingo@...hat.com,
        hpa@...or.com, x86@...nel.org, linux-edac@...r.kernel.org,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: PROBLEM: mce: [Hardware Error] from dmesg -l emerg

On Mon, May 21, 2018 at 05:06:14PM -0700, Luck, Tony wrote:
> On Tue, May 22, 2018 at 02:43:37AM +0530, Jeffrin Thalakkottoor wrote:
> > mce: [Hardware Error]: CPU 0: Machine Check: 0 Bank 5: ee0000000040110b
> > mce: [Hardware Error]: TSC 0 ADDR 160000080 MISC 5040008086
> > mce: [Hardware Error]: PROCESSOR 0:306d4 TIME 1526932210 SOCKET 0 APIC
> > 0 microcode 2a
> 
> The problem is that "mcelog --ascii" is expecting the first line to
> look like:
> 
> 	CPU 0: Machine Check Exception: 0 Bank 5: ee0000000040110b
> 
> This seems to have been broken by commit:
> 
> 	cd9c57cad3fe ("x86/MCE: Dump MCE to dmesg if no consumers")
> 
> relevent part is this ... where we now conditionally include the
> word "Exception".

Well, mcelog should decode the error signature regardless whether it
says "Exception" or not, IMO.

-- 
Regards/Gruss,
    Boris.

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