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Date: Wed, 05 Dec 2012 11:05:36 +0200
From: Andriy Gapon <avg@FreeBSD.org>
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To: Stefan Farfeleder <stefanf@FreeBSD.org>
Subject: Re: ACPI panic
References: <20121125140008.GA1497@mole.fafoe.narf.at>
 <50B244A1.1040800@FreeBSD.org> <20121126091101.GA1469@mole.fafoe.narf.at>
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 <50B34EEA.4000209@FreeBSD.org> <20121129084627.GA1450@mole.fafoe.narf.at>
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on 04/12/2012 10:50 Stefan Farfeleder said the following:
> These checks have not triggered additional panics. I still get the cycle
> one.

I am really out of ideas now on how that cycle could be created... :-(
Perhaps, try to add another copy of the loop detection code to the place after
an object is added to the cache list and before the mutex is released.
And also, just in case, another copy to AcpiOsAcquireObject.

-- 
Andriy Gapon