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Date: Sat, 13 Dec 2014 11:38:23 +0200
From: Ivan Klymenko <fidaj@ukr.net>
To: Andriy Gapon <avg@FreeBSD.org>
Subject: Re: 11-CURRENT r275641 panic: Unrecoverable machine check exception
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=D0=92 Sat, 13 Dec 2014 02:18:47 +0200
Andriy Gapon <avg@FreeBSD.org> =D0=BF=D0=B8=D1=88=D0=B5=D1=82:

> On 12/12/2014 21:46, Ivan Klymenko wrote:
> > Hi.
> >=20
> >=20
> > I see such a panic the first time in 10 years.
>=20
> good

and how

>=20
> > Fri Dec 12 21:35:11 EET 2014
> >=20
> > FreeBSD nonamehost.local 11.0-CURRENT FreeBSD 11.0-CURRENT #0
> > r275641: Tue Dec  9 17:03:43 EET 2014
> > ivan@nonamehost.local:/media/da0s1/obj/usr/src/sys/mk11  amd64
> >=20
> > panic: Unrecoverable machine check exception
>=20
> Google for "machine check exception" if you haven't yet.
>=20

I very much doubt that it is a hardware problem - in the other case, I
would not write about it here

-CPU is not overclocked
-Memory (RAM) is in order
-no overheating
-panic accurately reproduced - not occur randomly
-Panic occurs without high load CPU
-mcelog --no-dmi --ascii - nothing


I suspect that the added non-existent instructions for my CPU

CPU: Intel(R) Core(TM) i5-2410M CPU @ 2.30GHz (2294.84-MHz K8-class CPU)
Origin=3D"GenuineIntel"  Id=3D0x206a7  Family=3D0x6  Model=3D0x2a  Stepping=
=3D7
Dec 13 10:11:45 nonamehost kernel:
Features=3D0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,=
MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,
TM,PBE>
Features2=3D0x1fbae3bf<SSE3,PCLMULQDQ,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,C=
X16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,TSCDLT,AESNI,X
SAVE,OSXSAVE,AVX>
AMD Features=3D0x28100800<SYSCALL,NX,RDTSCP,LM>
AMD Features2=3D0x1<LAHF> Dec 13 10:11:45 nonamehost kernel:
XSAVE Features=3D0x1<XSAVEOPT>

and it manifests itself in the assembly source code with the flag
CPUTYPE?=3Dcorei7-avx

I certainly could be wrong - but how to know for sure the cause of the
panic?

Best regards.