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From: John Baldwin <jhb@freebsd.org>
To: TAKAHASHI Yoshihiro <nyan@freebsd.org>
Date: Mon, 13 Feb 2012 13:08:48 -0500
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	(bigwig.baldwin.cx); Mon, 13 Feb 2012 14:15:10 -0500 (EST)
Cc: current@freebsd.org
Subject: Re: MCA UNCOR error
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On Sunday, February 12, 2012 4:55:49 am TAKAHASHI Yoshihiro wrote:
> I get the following error and kernel panic on my pc98 at the boot time.
> 
> MCA: Bank 2, Status 0xb600000000140000
> MCA: Global Cap 0x0000000000000005, Status 0x0000000000000004
> MCA: Vendor "GenuineIntel", ID 0x616, APIC ID 0
> MCA: CPU 0 UNCOR PCC no error
> MCA: Address 0x3446ff003446ff
> 
> When I disable MCA with hw.mca.enabled=0 on loader prompt, the machine
> works fine.  Does it mean my pc98 is broken?  Or other isssue?
> 
> It's spec is:
> 
> FreeBSD 10.0-CURRENT #5: Thu Feb  9 13:18:22 UTC 2012
> CPU: Pentium Pro (198.95-MHz 686-class CPU)
>   Origin = "GenuineIntel"  Id = 0x616  Family = 6  Model = 1  Stepping = 6
>   Features=0xf9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV>
> real memory  = 134217728 (128 MB)
> avail memory = 120471552 (114 MB)

Interesting, that is odd to get an error with no error code.

Can you tell from the stack trace if your CPU actually raised a machine check 
exception (trap 28)?

-- 
John Baldwin