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

[Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>]

On 6/27/2013 5:08 AM, Jan Beulich wrote:
> > > > 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.
Is the "debugging" enabled by default?  I didn't specify any debug when 
building.
How can I check and disable debugging?

> (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.
I'm not quite sure what you meant here.  Are you saying that this 
"crashing" is a known issue?
>   And that's what the purpose of that patch is.
This patch is crashing the system. What do you mean by "And that's what 
the purpose of that patch is"?
Suravee
> Jan


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