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SubjectRe: [Xen-devel] PROBLEM: kernel panic xsave_init
>>> On 19.10.15 at 18:25, <boris.ostrovsky@oracle.com> wrote:
> On 10/19/2015 06:16 AM, John Doe wrote:
>>>> [ 0.000000] general protection fault: 0000 [#1] SMP
>>>> [ 0.000000] Modules linked in:
>>>> [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted
> 4.1.9-6.pvops.qubes.x86_64 #1
>>>> [ 0.000000] Hardware name: To Be Filled By O.E.M. To Be Filled By
> O.E.M./Z170 Extreme4, BIOS P1.80 09/18/2015
>>>> [ 0.000000] task: ffffffff81c154c0 ti: ffffffff81c00000 task.ti:
> ffffffff81c00000
>>>> [ 0.000000] RIP: e030:[<ffffffff81d58fad>] [<ffffffff81d58fad>]
> xstate_enable_boot_cpu+0xde/0x288
>>>> [ 0.000000] RSP: e02b:ffffffff81c03de8 EFLAGS: 00010046
>>>> [ 0.000000] RAX: 000000000000001f RBX: 0000000000000008 RCX:
> 0000000000000000
>>>> [ 0.000000] RDX: 0000000000000000 RSI: 000000000000001f RDI:
> 0000000000042660
>
>
> It would be good to see what's at ffffffff81d58fad. My guess would be
> that it's xsetbv.
>
> If it is then you probably want to make sure you are running hypervisor
> that has commit e8121c54 ("x86/xsave: enable support for new ISA
> extensions"). Looks like the first version that has it is 4.5 and you
> seem to be running 4.4.2.
>
> Copying Jan to see if there are plans to backport this (probably not
> since it's a new feature).

Hmm, if there are features getting exposed that lead to crashes like
this, then while we wouldn't normally backport enhancements, we
may need to consider adding a one-off patch to hide respective
features to that stable branch. But first we of course need to
understand what is going on here.

Jan



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