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    SubjectRe: IDE + SMP Lockup (no OOPS) in 2.2.12, 2.2.10
    > >>EIP: c01d3455 <stext_lock+255d/4a88>=0A=
    > Trace: c0197828 <ide_dma_intr+0/90>=0A=

    Ok so it took an IRQ and gets stuck waiting on a lock - looks like
    the hwgroup->spinlock

    > Aiee, killing interrupt handler=0A=
    > Kernel panic: Attempted to kill the idle task!=0A=

    This second trace is the other CPU (perfect....)

    > >>EIP: c010aee0 <disable_irq+34/40>=0A=
    > Trace: c0189957 <ide_do_request+2f7/550>=0A=
    > Trace: c0189c2c <do_hwgroup_request+48/5c>=0A=

    Which makes it all to clear

    Ok whats happened is this

    CPU0 CPU1
    take hwgroup spinlock
    take an irq
    [wait for IRQ completion]
    try to take hwgroup spinlock


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