Date: Sat, 9 Sep 2017 16:07:00 +0200
From: Borislav Petkov <bp@alien8.de>
To: Markus Trippelsdorf <markus@trippelsdorf.de>
Cc: Andy Lutomirski <luto@kernel.org>, Ingo Molnar <mingo@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Peter Zijlstra <peterz@infradead.org>,
        LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@redhat.com>,
        Tom Lendacky <thomas.lendacky@amd.com>
Subject: Re: Current mainline git (24e700e291d52bd2) hangs when building e.g.
 perf
Message-ID: <20170909140700.bp7jonmp7etlb7ov@pd.tnic>
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 <20170908171633.GA279@x4>
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 <20170908215656.qw66lgfsfgpoqrdm@pd.tnic>
 <20170909063908.GA277@x4>
 <20170909101810.a757cja7vslofyrj@pd.tnic>
 <20170909110749.GA277@x4>
 <20170909130727.3jjnc6p5g45dihmy@pd.tnic>
 <20170909133745.GA289@x4>
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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.

Good mailing practices for 400: avoid top-posting and trim the reply.