Re: Linux 4.9.6 ( Restore IO-APIC irq_chip retrigger callback , breaks my box )

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On Mon, 13 Feb 2017, Linus Torvalds wrote:
> On Mon, Feb 13, 2017 at 11:33 AM, Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
> >
> > We never retrigger any of the special vectors, just the device interrupts
> > can get that treatment and there only the few edge interrupts connected to
> > the IO-APIC are relevant.
> 
> Don't we walk up to the local apic when we walk the parent chain? I
> didn't check how the parent chain thing is connected..
> 
> Anyway, I'm wondering if the WARN_ON might give some ideas (and I just
> noticed that I made the WARN_ON() be WARN_ON_ONCE() in the patch I
> sent out, because I'm so used to trying to avoid constant streams of
> warnings, but in this case we migth want them - particularly if
> Gabriel then tries it with a broken kernel and we get a "it halts
> after _this_ one" situation.
> 
> > Boris has access to a machine with a similar CPU. It shows the symptom of
> > boot hang, but only after Boris used Gabriels config file. The normal SuSe
> > config just boots fine. Again, nothing stands out there which immediately
> > rings a bell. :(
> 
> Oh, I must have missed that email.
> 
> Boris - have you tried to narrow down the exact config isse with the
> ktest config bisection script? I haven't used it myself, but I'm
> adding StevenR to see if he has suggestions.

I found a machine myself which does not come up with that config, but the
remote console is not working, so I'll poke at it first thing tomorrow
morning when I'm in the office.

Thanks,

	tglx
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