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

["Sven Köhler" <sven.koehler@gmail.com>]

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!


Regards,
  Sven

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