Re: [Xen-devel] PROBLEM: kernel panic xsave_init

From: John Doe
Date: Tue Oct 20 2015 - 08:11:53 EST


On 20/10/2015 11:51, Jan Beulich wrote:
>>>> On 19.10.15 at 18:25, <boris.ostrovsky@xxxxxxxxxx> 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
>

I will try with 4.6.0 asap, unfortunately the 4.4.2 image i have is not
built with debug enabled and i'm unable to run gdb at boot, i'm building
a new one right now.
If you need anything else please be very step-specific since i'm not
very practical at this.

Thank you,
John.

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