Re: crash on boot with 4.6.1 on fedora 24

From: Martin Cerveny <martin@c-home.cz>
To: Martin Cerveny <M.Cerveny@computer.org>
Cc: Juergen Gross <jgross@suse.com>,
	xen-devel@lists.xen.org, David Vrabel <david.vrabel@citrix.com>,
	Jan Beulich <JBeulich@suse.com>,
	Kevin Moraga <kmoragas@riseup.net>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>
Subject: Re: crash on boot with 4.6.1 on fedora 24
Date: Thu, 2 Jun 2016 15:15:55 +0200 (CEST)	[thread overview]
Message-ID: <alpine.GSO.2.00.1606021512240.8811@dmz.c-home.cz> (raw)
In-Reply-To: <alpine.GSO.2.00.1606020749430.6098@dmz.c-home.cz>

On Thu, 2 Jun 2016, Martin Cerveny wrote:

>
>
> On Wed, 1 Jun 2016, Boris Ostrovsky wrote:
>
>> On 06/01/2016 05:01 PM, Martin Cerveny wrote:
>>> Hello.
>>> 
>>> On Wed, 1 Jun 2016, Boris Ostrovsky wrote:
>>>> On 06/01/2016 12:23 PM, Martin Cerveny wrote:
>>>>> :-(
>>>>> 
>>>>> On Wed, 1 Jun 2016, Martin Cerveny wrote:
>>>>>> I hit probably the same error with released "XenServer 7.0".
>>>>>> - I have Xen4.6.1 (commit d77bac5c064ffb9dbb5b89b55b89853f1b784ebf -
>>>>>> update Xen version to 4.6.1)
>>>>>> - XS7 (Dundee) beta3 (kernel-3.10.96-479.383024.x86_64.rpm) work OK
>>>>>> - XS7 release (kernel-3.10.96-484.383030.x86_64.rpm) crash
>>>>>> - patch does not work, arch/x86/xen/mmu.c is very old in 3.10
>>>>>> - Can someone verify error ?
>>>>>> 
>>>>>> Thanks, Martin Cerveny
>>>>>> 
>>>>>> Crash (kernel-3.10.96-479.383024.x86_64.rpm):
>>>>>          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>>>>> correction: kernel-3.10.96-484.383030.x86_64.rpm
>>>> If you can provide vmlinux (better) or System.map we can probably see
>>>> whether it's the same signature.
>>> 
>>> http://xenserver.org/open-source-virtualization-download.html
>>> ->
>>> XenServer-7.0.0-main.iso or XenServer-7.0.0-binpkg.iso
>>> ->
>>> kernel-3.10.96-484.383030.x86_64.rpm
>>> ->
>>> System.map-3.10.0+10  vmlinuz-3.10.0+10
>>> ->
>>> http://s000.tinyupload.com/index.php?file_id=30528714656973136220
>>> 
>>> Thanks for analyzing, Martin
>> 
>> 
>> This looks like a different problem, the stack is
>> ...
>> start_kernel
>>    cleanup_highmap
>>        xen_set_pmd_hyper
>>            arbitrary_virt_to_machine
>> 
>> Can you reproduce this with a newer kernel?
>
> Thanks for analysing.
>
> But there is no new kernel.
>
> XenServer7 has specially crafted Centos7 kernel
> ( https://github.com/xenserver/linux-3.x + 
> https://github.com/xenserver/linux-3.x.pg ) and will not move
> to newer kernel. I must stay on this kernel because NVidia vgpu
> binary blob does not support newer and nvidia refuses
> to share sources to kernel bridge for vgpu ( 
> https://gridforums.nvidia.com/default/topic/231/?comment=1920 )
> I will stay on working XS7 beta3 kernel.
>
> Thanks, Martin Cerveny
>

Now I found the problem of my XS7 crash - surprisingly "crashkernel" xen parameter :-)
I log error to XS https://bugs.xenserver.org/browse/XSO-554

Thanks for help, Martin Cerveny

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