Re: [Xen-devel] x86/AMD: Nested hvm crashes in 4.3

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 27.06.13 at 11:20, Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx> 
>>> wrote:
> On 6/27/2013 3:22 AM, Jan Beulich wrote:
>>>>> On 27.06.13 at 02:24, Suravee Suthikulanit 
>>>>> <suravee.suthikulpanit@xxxxxxx> wrote:
>>> I have found an issue in where the system crash right when I start
>>> another HVM guest inside an HVM guest.  I have traced back to the patch
>>> which the issue started.
>>>
>>> commit f1bde87fc08ce8c818a1640a8fe4765d48923091
>>> Author: Jan Beulich <jbeulich@xxxxxxxx>
>>> Date:   Fri Feb 8 11:06:04 2013 +0100
>>>
>>>       x86: debugging code for testing 16Tb support on smaller memory systems
>>>
>>>       Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>>>       Acked-by: Keir Fraser <keir@xxxxxxx>
>> We had issues exposed by this patch before, but any such issue
>> would just have been masked before that patch (and would
>> surface on a system with more than 5Tb of memory anyway).
> 
> The system I am having the issue has 48GB of memory.

Which is why you're seeing the problem only with the debugging
code enabled. (And of course I didn't really expect you to have
tried this on a huge memory system - they're just too rare still
for this to be likely.)

>> So it is very unlikely for the patch itself to be at fault.
> 
> I have traced the issue and found that the system crashing starts from this 
> commit id and onward.
> (i.e. The system does not crash with commit id 
> ed759d20249197cf87b338ff0ed328052ca3b8e7)
> So, I am still believe that this patch has somehow triggered the issue.

As said - I'm pretty certain this merely unmasked an already
lurking issue. And that's what the purpose of that patch is.

Jan


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