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Re: [Xen-devel] [BUG] panic: "IO-APIC + timer doesn't work" - several people have reproduced
- To: Jason Andryuk <jandryuk@xxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 18 Feb 2020 21:45:22 +0000
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- Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Aaron Janse <aaron@xxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>
- Delivery-date: Tue, 18 Feb 2020 21:45:36 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 18/02/2020 18:43, Jason Andryuk wrote:
> On Mon, Feb 17, 2020, 8:22 PM Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:
>> On 17/02/2020 20:41, Jason Andryuk wrote:
>>> On Mon, Feb 17, 2020 at 2:46 PM Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>>> wrote:
>>>> On 17/02/2020 19:19, Jason Andryuk wrote:
>>>>> enabling vecOn Tue, Dec 31, 2019 at 5:43 AM Aaron Janse <aaron@xxxxxxxxx>
>>>>> wrote:
>>>>>> On Tue, Dec 31, 2019, at 12:27 AM, Andrew Cooper wrote:
>>>>>>> Is there any full boot log in the bad case? Debugging via divination
>>>>>>> isn't an effective way to get things done.
>>>>>> Agreed. I included some more verbose logs towards the end of the email
>>>>>> (typed up by hand).
>>>>>>
>>>>>> Attached are pictures from a slow-motion video of my laptop booting.
>>>>>> Note that I also included a picture of a stack trace that happens
>>>>>> immediately before reboot. It doesn't look related, but I wanted to
>>>>>> include it anyway.
>>>>>>
>>>>>> I think the original email should have said "4.8.5" instead of "4.0.5."
>>>>>> Regardless, everyone on this mailing list can now see all the boot logs
>>>>>> that I've seen.
>>>>>>
>>>>>> Attaching a serial console seems like it would be difficult to do on
>>>>>> this laptop, otherwise I would have sent the logs as a txt file.
>>>>> I'm seeing Xen panic: "IO-APIC + timer doesn't work" on a Dell
>>>>> Latitude 7200 2-in-1. Fedora 31 Live USB image boots successfully.
>>>>> No way to get serial output. I manually recreated the output before
>>>>> from the vga display.
>>>> We have multiple bugs.
>>>>
>>>> First and foremost, Xen seems totally broken when running in ExtINT
>>>> mode. This needs addressing, and ought to be sufficient to let Xen
>>>> boot, at which point we can try to figure out why it is trying to fall
>>>> back into 486(ish) compatibility mode.
> Xen has "enabled ExtINT on CPU#0" while linux has "masked ExtINT on
> CPU#0" so linux isn't using ExtINT?
It would appear not. Even more concerningly, on my Kabylake box,
# xl dmesg | grep ExtINT
(XEN) enabled ExtINT on CPU#0
(XEN) masked ExtINT on CPU#1
(XEN) masked ExtINT on CPU#2
(XEN) masked ExtINT on CPU#3
(XEN) masked ExtINT on CPU#4
(XEN) masked ExtINT on CPU#5
(XEN) masked ExtINT on CPU#6
(XEN) masked ExtINT on CPU#7
which at first glance suggests that we have something asymmetric being
set up.
~Andrew
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