Re: [Xen-devel] Xen-unstable: pci-passthrough "irq 16: nobody cared" on HVM guest shutdown on irq of device not passed through.

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 26.09.14 at 12:02, <linux@xxxxxxxxxxxxxx> wrote:

> Friday, September 26, 2014, 11:43:04 AM, you wrote:
> 
>>>>> On 26.09.14 at 11:18, <linux@xxxxxxxxxxxxxx> wrote:
>>> Friday, September 26, 2014, 8:59:22 AM, you wrote:
>>>>>>> On 26.09.14 at 00:09, <linux@xxxxxxxxxxxxxx> wrote:
>>>>> - Tried switching off the onboard soundcard in the bios. Now irq16 is not 
>>>>> bound 
>>>>>   to any device, but the machine still freezes without any error (on 
>>>>> serial 
>>>>>   console with sync-console on, triple ctrl-a also doesn't work anymore)
>>> 
>>>> I suppose that hang is with irqpoll still in use? Ctrl-a not working 
>>>> anymore
>>>> makes me wonder whether you use a PCI serial card sitting on that same
>>>> IRQ for the Xen console... 
>>> 
>>> With and without irqpoll in use. 
> 
>> Oh, even without. That's worrying indeed. But again, the main thing
>> to understand is who sets up and unmasks IRQ 16 when and for
>> what reason.
> 
> After i disabled the sound device in the bios, irq16 is not setup anymore.
> It's not present in /proc/interrupts, i don't see it in the logs (no gsi 16, 
> 
> no irq 16)
> I also don't get the "irq 16 nobody cared" anymore, but instead a freeze.
> 
> So i'm a bit inclined to say that it is a coincidence that what ever is 
> wrong 
> always seems to hit that when it was present, but is hitting something else 
> less 
> verbose now and freezing the machine.

So how deterministic is the point in time when the freeze occurs? Did
you try passing "watchdog" to the hypervisor (assuming it works on
that box)?

Jan


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