MCA UNCOR error

[TAKAHASHI Yoshihiro]

In article <201202131308.48171.jhb at freebsd.org>
John Baldwin <jhb at freebsd.org> writes:

> 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)?

I tested with debugger enabled kernel.
Please get from:
http://home.jp.freebsd.org/~nyan/mca-error1.jpg
http://home.jp.freebsd.org/~nyan/mca-error2.jpg
(Sorry for jpeg images)

---
TAKAHASHI Yoshihiro <nyan at FreeBSD.org>