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

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On Mon, 13 Feb 2017 12:12:53 -0800
Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> 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.
>

Funny you mention this. I'm about to finish a config-bisect stand alone
script (doesn't need all the stuff that ktest.pl has), and I was
looking for a test case.

-- Steve
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