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Date: Wed, 24 Aug 2011 18:18:33 -0400
Subject: Re: kernel oops and panic in acpi_atomic_read under 2.6.39.3.   call
 trace included
From: rick@microway.com
To: "Huang Ying" <ying.huang@intel.com>
Cc: "Don Zickus" <dzickus@redhat.com>, "Rafael J. Wysocki" <rjw@sisk.pl>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "Richard Houghton" <rhoughton@microway.com>,
        "ACPI Devel Mailing List" <linux-acpi@vger.kernel.org>,
        "Len Brown" <lenb@kernel.org>, "Matthew Garrett" <mjg59@srcf.ucam.org>
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Hi Huang,

The original system needs to ship to our customer ASAP.  Disabling ghes is
sufficient for the time being for that.  As such, I have set up an
identical system as a temporary master for another cluster to continue
this testing.

I have applied your patch.  Here is the output of dmesg | grep GHES so far:


[    9.272198] GHES: gar mapped: 0, 0xbf7b5ff0
[    9.280782] GHES: gar mapped: 0, 0xbf7b6200
[    9.285102] [Firmware Warn]: GHES: Poll interval is 0 for generic
hardware error source: 1, disabled.

I have the serial console activated and stress tests started back up. 
I'll reply with the output once I get another panic.

Thanks!
Rick

> Hi, Rick,
>
> It appears that panic occurs in acpi_atomic_read.  I think the most
> likely cause is that the acpi_generic_address is not pre-mapped.  Can
> you try the patch attached?
>
> It will print registers mapped and accessed.  To use it, run the
> following command line before workload.
>
> dmesg | grep GHES
>
> Then try to find something like
>
> GHES: gar accessed: x, xxxx
>
> in kernel log when panic occurs.
>
> Best Regards,
> Huang Ying
>
>