Re: [Xen-devel] [Xen-users] pvgrub: Error 9: Unknown boot failure

[Juergen Gross <jgross@xxxxxxxx>]

On 07/12/16 17:28, Jan Beulich wrote:
>>>> On 07.12.16 at 17:18, <JGross@xxxxxxxx> wrote:
>> On 07/12/16 17:10, Sven Köhler wrote:
>>> Am 28.09.2016 um 05:50 schrieb Juergen Gross:
>>>> On 28/09/16 01:33, Sven Köhler wrote:
>>>>> Am 27.09.2016 um 14:52 schrieb Juergen Gross:
>>>>>> On 27/09/16 14:09, Sven Köhler wrote:
>>>>>>> Am 27.09.2016 um 14:02 schrieb Juergen Gross:
>>>>>>>> On 27/09/16 13:13, Sven Köhler wrote:
>>>>>>>>> Am 27.09.2016 um 07:31 schrieb Juergen Gross:
>>>>>>>>>> On 27/09/16 00:48, Sven Köhler wrote:
>>>>>>>>>>> Am 26.09.2016 um 07:43 schrieb Juergen Gross:
>>>>>>>>>>>> On 25/09/16 18:04, Sven Köhler wrote:
>>>>>>>>>>>>> Hi,
>>>>>>>>>>>>>
>>>>>>>>>>>>> I'm experiencing the bug below which was discussed on xen-devel 
>>>>>>>>>>>>> December
>>>>>>>>>>>>> last year buy Ian and Juergen. I'm using xen-pvgrub-4.7.0 on 
>>>>>>>>>>>>> Gentoo.
>>>>>>>>>>>>>
>>>>>>>>>>>>> The bug only seems to occur with the last domU booted on my 
>>>>>>>>>>>>> machine.
>>>>>>>>>>>>> Where do I find a patch that fixes that?
>>>>>>>>>>>>
>>>>>>>>>>>> The issue back in December was fixed by commit
>>>>>>>>>>>> c8eb0ec277ae387e78d685523e0fee633e46f046 which is included in Xen 
>>>>>>>>>>>> 4.7.
>>>>>>>>>>>> Either gentoo didn't update to the official Xen 4.7 release 
>>>>>>>>>>>> (including
>>>>>>>>>>>> pvgrub) or you are seeing a new issue.
>>>>>>>>>>>
>>>>>>>>>>> From the looks of it, the Gentoo package is using the grub from the
>>>>>>>>>>> xen-4.7.0 tarball.
>>>>>>>>>>>
>>>>>>>>>>> I downgraded to pvgrub 4.6.3 and the problem went away.
>>>>>>>>>>>
>>>>>>>>>>> So I assume I'm seeing a new issue. How do I debug it?
>>>>>>>>>>
>>>>>>>>>> Interesting. Just tested it on upstream Xen and saw the same problem
>>>>>>>>>> with a rather old guest kernel (3.0 based, xen flavor), while a newer
>>>>>>>>>> kernel (4.1, pvops) is working.
>>>>>>>>>>
>>>>>>>>>> Can you give me some more details about the kernel you are trying to
>>>>>>>>>> boot?
>>>>>>>>>
>>>>>>>>> It's an unmodified 4.4.21 kernel which I compile by hand. The config 
>>>>>>>>> is
>>>>>>>>> attached. Does that help?
>>>>>>>>
>>>>>>>> Not really. OTOH I think I don't need more help, as I've found a 
>>>>>>>> problem
>>>>>>>> in pvgrub. I have a patch which seems to correct the issue. Are you 
>>>>>>>> fine
>>>>>>>> with me adding you as the original reporter of the problem in the 
>>>>>>>> patch?
>>>>>>>
>>>>>>> Yes, I'm fine with adding me as the reporter.
>>>>>>> Do you want me to test the patch first?
>>>>>>
>>>>>> Sure. The attached patch is for Xen upstream, but I think it should
>>>>>> apply to Xen 4.7, too.
>>>>>
>>>>> This patch solved the issue for me. My domU boots fine again after
>>>>> recompiling pvgrub with the patch applied.
>>>>>
>>>>> Thanks!
>>>>
>>>> Thank you for the test!
>>>
>>> It seems this patch was not included in 4.7.1. That's a shame, cause I
>>> ran into the same issue after upgrading to 4.7.1.
>>
>> Right. Jan, could you please include the patch for 4.7.2? Upstream
>> commit was 9714f6b87e19b32d3a6663a20df6610265c4bfe5.
> 
> Samuel, could you confirm that this is okay to backport. In
> which case the question then is whether 4.6.5 should get it
> too - with p2m_seg mentioned no-where else under stubdom/
> I can't really tell where this is coming from.

4.6 is not affected.


Juergen


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