Re: [Xen-devel] PoD code killing domain before it really gets started

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 26.07.12 at 18:14, George Dunlap <george.dunlap@xxxxxxxxxxxxx> wrote:
> I think what I would try to do is to add a stack trace to the 
> demand_populate() failure path, so you can see where the call came from; 
> i.e., if it came from a guest access, or from someone in dom0 writing to 
> some of the memory. I'd also add a printk to set_pod_target(), so you 
> can see if it was actually called and what it was set to.

Yes, that sounds very similar to the plans I had in case you don't
recall any respective fixes or have any other immediate idea
about the problem. Albeit guest accesses can be excluded here
afaict, given that the guest didn't even get started yet. But
indeed, with nothing really fitting together, we really need to
make sure...

Meanwhile I also got confirmed that this can happen strait after
boot, which makes it all the more questionable - almost all pages
should hold zeros only, and hence the PoD code should be able
to find victim pages among the populated ones, yet it obviously
doesn't.

Jan


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