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

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Date:	Tue, 5 Jun 2007 11:13:42 -0700
From:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
To:	"Darrick J. Wong" <djwong@...ibm.com>
Cc:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	linux-kernel@...r.kernel.org, ebiederm@...ssion.com
Subject: Re: Device hang when offlining a CPU due to IRQ misrouting

On Tue, Jun 05, 2007 at 10:36:47AM -0700, Darrick J. Wong wrote:
> On Tue, Jun 05, 2007 at 10:23:10AM -0700, Siddha, Suresh B wrote:
> 
> > Darrick, I see a kernel bug in this area(which is already filled with bugs,
> > and I am looking into ways to fix them). Are you making sure that
> > between step-1 and step-2, that interrupts actually started arriving at cpu1?
> > 
> > i.e., do step-1 and wait till the irq's start hitting at cpu1. At this point
> > do step-2 and let us know if you still hit this bug?
> 
> Yes, the bug only happens after CPU1 begins to receive interrupts.

I see. Your system should have 4 or 8 logical cpu's right. So you must be
using logical flat mode, right?

When this bug happens, what does /proc/irq/<irq-no>/smp_affinity show?

thanks,
suresh
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