On Fri, Oct 06, 2006 at 09:14:53AM -0600, Eric W. Biederman wrote:
> Muli Ben-Yehuda <[email protected]> writes:
>
> > My x366 no longer boots with 2.6.19-rc1. The boot either hangs in
> > uhci_hcd_init or dies with 'do_IRQ: cannot handle IRQ -1". Bisection
> > says this one is bad:
>
> Ok. So at least the second case is because some irq is being delivered
> to a cpu that was not expecting it.
>
> The hang case is weird because the kernel does not get told about
> the irqs on your second ioapic.
>
> When it gets the 'do_IRQ: cannot handle IRQ -1' how long
> has the system been in user space? (It doesn't look like
> init got started but that is hard to tell, shutting off irqbalanced
> for testing purposes would be interesting)
In some cases we haven't made it to userspace at all. In other, we're
in the initrd.
> Seeing the failure case is really weird because this early in boot
> everything should be routed to cpu 0.
>
> What happens if you boot with max_cpus=1?
Trying it now... woohoo, it boots all the way and stays up!
> The change the patch introduced was that we are now always
> pointing irqs towards individual cpus, and not accepting an irq
> if it comes into the wrong cpu.
>
> The only hypothesis I have so far is that there may be an issue
> with the x366 chipset ioapics that this patch reveals.
>
> I would suspect a wider issue but in several months of testing
> this is the first bug report I have seen.
I'm trying to find out if other x366's are also seeing it.
> If simple tests don't reveal what is going on then we will
> have to instrument up that BUG and print out the per
> cpu vector to irq tables, the cpu number, and the vector
> the unexpected irq came in on.
I'm certainly game for any debugging you have in mind - this is my
main Calgary development machine so getting it booting is a pretty
high priority :-)
Cheers,
Muli
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