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



Am 07.12.2016 um 17:33 schrieb Jan Beulich:
>>>> On 07.12.16 at 17:10, <sven.koehler@xxxxxxxxx> 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.
> 
> I don't think anyone requested its inclusion - that process is in no
> way automatic.

I reported the error for 4.7.0, and I thought that Juergen might have
suggested it for inclusion. I upgraded to 4.7.1 just a few days ago, so
I thought I should point out that this patch was missed.

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