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

[Martin Cerveny <martin@xxxxxxxxx>]

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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