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    SubjectRe: VM86 interrupt emulation breakage and FIXes for 2.6.x kernel series
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    On Iau, 2004-12-09 at 13:59, Pavel Pisa wrote:
    > if (vm86_irqs[intno].sig)
    > send_sig(vm86_irqs[intno].sig, vm86_irqs[intno].tsk, 1);
    > /* else user will poll for IRQs */
    > + spin_unlock_irqrestore(&irqbits_lock, flags);
    > + /* Next line would be required to handle correctly level activated
    > interrupts */
    > + disable_irq(intno);
    > + return IRQ_HANDLED;

    You can't disable_irq and return to user space - the IRQ may be shared
    by a device needed to make user space progress.

    The rest looks like a real bug.
    -
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