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Re: Linux DomU freezes and dies under heavy memory shuffling

Hi Jürgen, thanks for taking a look at this. A few comments below:

On Tue, Feb 16, 2021 at 10:47 PM Jürgen Groß <jgross@xxxxxxxx> wrote:
> On 16.02.21 21:34, Stefano Stabellini wrote:
> > + x86 maintainers
> >
> > It looks like the tlbflush is getting stuck?
> I have seen this case multiple times on customer systems now, but
> reproducing it reliably seems to be very hard.

It is reliably reproducible under my workload but it take a long time
(~3 days of the workload running in the lab).

> I suspected fifo events to be blamed, but just yesterday I've been
> informed of another case with fifo events disabled in the guest.
> One common pattern seems to be that up to now I have seen this effect
> only on systems with Intel Gold cpus. Can it be confirmed to be true
> in this case, too?

I am pretty sure mine isn't -- I can get you full CPU specs if that's useful.

> In case anybody has a reproducer (either in a guest or dom0) with a
> setup where a diagnostic kernel can be used, I'd be _very_ interested!

I can easily add things to Dom0 and DomU. Whether that will disrupt the
experiment is, of course, another matter. Still please let me know what
would be helpful to do.




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