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Re: [Xen-devel] crash on boot with 4.6.1 on fedora 24





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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