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

[Juergen Gross <jgross@xxxxxxxx>]

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!


Juergen


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