linux-kernel - Re: Current mainline git (24e700e291d52bd2) hangs when building e.g. perf

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Date:   Sat, 9 Sep 2017 16:07:00 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Markus Trippelsdorf <markus@...ppelsdorf.de>
Cc:     Andy Lutomirski <luto@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: Current mainline git (24e700e291d52bd2) hangs when building e.g.
 perf

On Sat, Sep 09, 2017 at 03:39:54PM +0200, Markus Trippelsdorf wrote:
> > mce: [Hardware Error]: CPU: 0 Machine Check Exception: 4 Bank 4: fa000010000b0c0f
> > mce: [Hardware Error]: TSC b75d6ef4ad MISC c00a00001000000
> > mce: [Hardware Error]: PROCESSOR 2:100f42 TIME 1504963036 SOCKET 0 APIC 0 microcode 1000db
> 
> Decoded:
> 
> CPU: 0 Machine Check Exception: 4 Bank 4: fa000010000b0c0f
> Hardware event. This is not a software error.
> CPU 0 0 data cache TSC b75d6ef4ad 
> TIME 1504963036 Sat Sep  9 15:17:16 2017
> STATUS 0 MCGSTATUS 0
> CPUID Vendor AMD Family 16 Model 4
> SOCKET 0 APIC 0 microcode 1000db

Yeah, this is not really decoding it - I need to address that case of
uncorrectable MCE not being decoded too.

In any case, it is not E383:

MC4_STATUS[Val|Over|UC|EN|MiscV|PCC|UECC|EEC: GART cache table walk encountered an invalid PTE (0x05)|ET: TLB(tt:GEN;ll:LG)]: 0xfa0020000005001b

And those should actually be masked out:

"BIOS is recommended to mask GART table walk errors by setting the bit
in MSRC001_0048 corresponding to F3x40[GartTblWkEn]."

And we disable those but for some reason, it doesn't stick :-)

Do

# modprobe msr
# rdmsr -a 0x00000410
# rdmsr -a 0xc0010048

as root.

Thanks.

-- 
Regards/Gruss,
    Boris.

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