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From: John Baldwin <jhb@freebsd.org>
To: TAKAHASHI Yoshihiro <nyan@freebsd.org>
Date: Tue, 14 Feb 2012 14:49:40 -0500
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Cc: current@freebsd.org
Subject: Re: MCA UNCOR error
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On Tuesday, February 14, 2012 10:11:22 am TAKAHASHI Yoshihiro wrote:
> In article <201202140909.33894.jhb@freebsd.org>
> John Baldwin <jhb@freebsd.org> writes:
> 
> >> >> 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?
> >> > 
> >> > 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)
> > 
> > Humm.  Try this:
> 
> Thanks.  But it still panics.
> 
> http://home.jp.freebsd.org/~nyan/mca-error3.jpg
> http://home.jp.freebsd.org/~nyan/mca-error4.jpg
> http://home.jp.freebsd.org/~nyan/mca-error5.jpg

Ah great, you can maybe test another patch I have.  Try this in addition
to the earlier patch:

http://www.freebsd.org/~jhb/patches/mca_alloc.patch

-- 
John Baldwin