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    SubjectRe: 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?

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