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

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 08/05/2016 23:51, Kevin Moraga wrote:
> Hi,
> I don't know if this is the exact same issue... but is the most related
> one that I found.
>
> I'm try to compile kernel 4.4.8 (using fedora 23) to run with Xen 4.6.0
> and Intel Skylake processor (Intel Core i7-6600U)
>
> This kernel is crashing almost in the same way as explained in this
> thread... But my problem is mainly with Skylake. Because the same
> configuration works within another machine but with another processor
> (Intel Core i5-3340M). Attached are the boot logs.
>
> A kernel configuration could be found in:
>
> https://github.com/marmarek/qubes-linux-kernel devel-4.4 branch
>
>
> I don't know if anybody else is having this issue.

Can you try booting Xen with "xsave=0" on the command line.

I notice dom0 found:

[    0.000000] x86/fpu: Supporting XSAVE feature 0x08: 'MPX bounds
registers'
[    0.000000] x86/fpu: Supporting XSAVE feature 0x10: 'MPX CSR'

And there sadly usually bugs like this when PV guest kernels start using
new cpu features.

~Andrew

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