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Message-ID: <Pine.LNX.4.55.0808302106140.29414@cliff.in.clinika.pl>
Date: Sat, 30 Aug 2008 21:16:58 +0100 (BST)
From: "Maciej W. Rozycki" <macro@...ux-mips.org>
To: Frans Pop <elendil@...net.nl>
cc: "Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: 2.6.27-rc3: 'APIC error on CPU1: 00(40)', but only on resume!
On Sat, 30 Aug 2008, Frans Pop wrote:
> > Barring a hardware erratum, this is a bug in the kernel. It should be
> > moderately easy to track down with some debugging added to writes
> > accessing LVT and redirection table entries.
>
> Could you please provide some more specific debugging instructions? I'm at
> a complete loss what I should do here.
Debugging code can be added to apic_write() and io_apic_{write,modify}()
so that a warning is output into the kernel log whenever a suspicious
value is written to one of the vector registers. Similarly for MSI/HT
interrupts, although I do not know names of the functions involved off the
head. Due to performance considerations it is unfortunately infeasible to
have such debugging enabled in production kernels.
Maciej
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