From: Jan Beulich <jbeulich@suse.com>
To: "Roger Pau Monné" <roger.pau@citrix.com>
Cc: xen-devel@lists.xenproject.org, Manuel Bouyer <bouyer@antioche.eu.org>
Subject: Re: NetBSD dom0 PVH: hardware interrupts stalls
Date: Tue, 24 Nov 2020 15:42:28 +0100 [thread overview]
Message-ID: <ee63d6c2-4d0f-a3b7-37d0-8ce45c9e6fb1@suse.com> (raw)
In-Reply-To: <b3912e97-9684-fe97-1053-ad7168a19721@suse.com>
On 24.11.2020 11:05, Jan Beulich wrote:
> On 23.11.2020 18:39, Manuel Bouyer wrote:
>> On Mon, Nov 23, 2020 at 06:06:10PM +0100, Roger Pau Monné wrote:
>>> OK, I'm afraid this is likely too verbose and messes with the timings.
>>>
>>> I've been looking (again) into the code, and I found something weird
>>> that I think could be related to the issue you are seeing, but haven't
>>> managed to try to boot the NetBSD kernel provided in order to assert
>>> whether it solves the issue or not (or even whether I'm able to
>>> repro it). Would you mind giving the patch below a try?
>>
>> With this, I get the same hang but XEN outputs don't wake up the interrupt
>> any more. The NetBSD counter shows only one interrupt for ioapic2 pin 2,
>> while I would have about 8 at the time of the hang.
>>
>> So, now it looks like interrupts are blocked forever.
>
> Which may be a good thing for debugging purposes, because now we have
> a way to investigate what is actually blocking the interrupt's
> delivery without having to worry about more output screwing the
> overall picture.
>
>> At
>> http://www-soc.lip6.fr/~bouyer/xen-log5.txt
>> you'll find the output of the 'i' key.
>
> (XEN) IRQ: 34 vec:59 IO-APIC-level status=010 aff:{0}/{0-7} in-flight=1 d0: 34(-MM)
>
> (XEN) IRQ 34 Vec 89:
> (XEN) Apic 0x02, Pin 2: vec=59 delivery=LoPri dest=L status=1 polarity=1 irr=1 trig=L mask=0 dest_id:00000001
Since it repeats in Manuel's latest dump, perhaps the odd combination
of status=1 and irr=1 is to tell us something? It is my understanding
that irr ought to become set only when delivery-status clears. Yet I
don't know what to take from this...
Jan
next prev parent reply other threads:[~2020-11-24 14:42 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-17 15:09 NetBSD dom0 PVH: hardware interrupts stalls Manuel Bouyer
2020-11-17 15:58 ` Roger Pau Monné
2020-11-17 16:40 ` Manuel Bouyer
2020-11-18 8:57 ` Roger Pau Monné
2020-11-18 9:24 ` Manuel Bouyer
2020-11-18 10:00 ` Roger Pau Monné
2020-11-18 12:14 ` Manuel Bouyer
2020-11-18 14:39 ` Roger Pau Monné
2020-11-18 14:59 ` Jan Beulich
2020-11-19 14:19 ` Roger Pau Monné
2020-11-19 15:57 ` Manuel Bouyer
2020-11-19 16:57 ` Manuel Bouyer
2020-11-19 17:57 ` Manuel Bouyer
2020-11-20 8:09 ` Jan Beulich
2020-11-20 8:28 ` Roger Pau Monné
2020-11-20 8:52 ` Manuel Bouyer
2020-11-20 8:59 ` Jan Beulich
2020-11-20 9:27 ` Manuel Bouyer
2020-11-20 10:00 ` Jan Beulich
2020-11-20 10:38 ` Manuel Bouyer
2020-11-23 9:57 ` Roger Pau Monné
2020-11-23 11:32 ` Manuel Bouyer
2020-11-23 12:51 ` Roger Pau Monné
2020-11-23 14:31 ` Manuel Bouyer
2020-11-23 17:06 ` Roger Pau Monné
2020-11-23 17:39 ` Manuel Bouyer
2020-11-24 10:05 ` Jan Beulich
2020-11-24 12:21 ` Roger Pau Monné
2020-11-24 13:59 ` Manuel Bouyer
2020-11-24 14:09 ` Jan Beulich
2020-11-24 14:27 ` Manuel Bouyer
2020-11-24 14:33 ` Jan Beulich
2020-11-24 14:36 ` Jan Beulich
2020-11-24 14:52 ` Jan Beulich
2020-11-24 15:00 ` Roger Pau Monné
2020-11-24 15:08 ` Manuel Bouyer
2020-11-24 15:49 ` Roger Pau Monné
2020-11-24 16:09 ` Manuel Bouyer
2020-11-26 13:34 ` Roger Pau Monné
2020-11-26 14:16 ` Manuel Bouyer
2020-11-26 14:26 ` Roger Pau Monné
2020-11-26 15:09 ` Roger Pau Monné
2020-11-26 17:20 ` Manuel Bouyer
2020-11-27 10:59 ` Roger Pau Monné
2020-11-27 11:18 ` Jan Beulich
2020-11-27 11:19 ` Manuel Bouyer
2020-11-27 11:21 ` Jan Beulich
2020-11-27 13:10 ` Manuel Bouyer
2020-11-27 13:14 ` Jan Beulich
2020-11-27 13:18 ` Manuel Bouyer
2020-11-27 11:29 ` Jan Beulich
2020-11-27 13:13 ` Manuel Bouyer
2020-11-27 13:18 ` Jan Beulich
2020-11-27 13:31 ` Manuel Bouyer
2020-11-27 13:40 ` Jan Beulich
2020-11-27 13:49 ` Jürgen Groß
2020-11-27 13:59 ` Manuel Bouyer
2020-11-27 20:22 ` Roger Pau Monné
2020-11-27 21:44 ` Manuel Bouyer
2020-11-28 14:53 ` Roger Pau Monné
2020-11-28 17:14 ` Manuel Bouyer
2020-11-29 9:23 ` Manuel Bouyer
2020-11-30 10:00 ` Jan Beulich
2020-11-30 10:28 ` Manuel Bouyer
2020-11-30 11:35 ` Manuel Bouyer
2020-11-30 11:44 ` Jan Beulich
2020-11-30 11:50 ` Manuel Bouyer
2020-11-30 12:09 ` Jan Beulich
2020-11-24 14:42 ` Jan Beulich [this message]
2020-11-24 14:59 ` Roger Pau Monné
2020-11-24 15:18 ` Manuel Bouyer
2020-11-24 15:23 ` Jürgen Groß
2020-11-20 8:54 ` Jan Beulich
2020-11-20 9:13 ` Manuel Bouyer
2020-11-23 9:49 ` Roger Pau Monné
2020-11-18 15:03 ` Manuel Bouyer
2020-11-18 9:16 ` Jan Beulich
2020-11-18 9:28 ` Manuel Bouyer
2020-11-18 9:43 ` Jan Beulich
2020-11-18 10:14 ` Manuel Bouyer
2020-11-18 11:17 ` Jan Beulich
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