linux-kernel - Re: Device hang when offlining a CPU due to IRQ misrouting

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Message-ID: <20070618223819.GD9751@tree.beaverton.ibm.com>
Date:	Mon, 18 Jun 2007 15:38:20 -0700
From:	"Darrick J. Wong" <djwong@...ibm.com>
To:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
Cc:	linux-kernel@...r.kernel.org, ebiederm@...ssion.com
Subject: Re: Device hang when offlining a CPU due to IRQ misrouting

On Thu, Jun 07, 2007 at 05:57:26PM -0700, Siddha, Suresh B wrote:

> As you have the failing system, you need to do more detective work and
> help me out. Can you try this debug patch and send across the dmesg after the
> bug happens and also can you try different compiler to see if something
> changes..

Hrm, I just updated to -rc5.  Interrupts being handled by the IOAPIC
don't suffer from this problem, but MSI interrupts are still affected.
I added a few printks to the kernel to figure out what IRQ affinity
masks were being passed around and saw this:

[  256.298773] Breaking affinity for irq 4341
[  256.298774] irq=4341 affinity=2 mask=d
<call to set_affinity>
[  256.298787] irq=4341 affinity=d
<ethernet on irq 4341 stops working>

I'll keep digging, but at least it appears that the problem has been
shrunk down to something the MSI code.

--D

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