Re: [Xen-devel] RFE: Detect NUMA misconfigurations and prevent machine freezes

[Dario Faggioli <dfaggioli@xxxxxxxx>]

On Thu, 2018-08-30 at 14:01 +1000, Steven Haigh wrote:
> On 2018-08-29 15:49, Juergen Gross wrote:
> > 
> > RAM placement should not matter here. As the name already suggests
> > cpupools do assignment of cpus. RAM allocated will be preferred
> > taken
> > from a local node, but this shouldn't be mandatory for success.
> > 
> > Would it be possible to use a debug hypervisor (e.g. 4.12-unstable) 
> > for
> > generating a verbose log (hypervisor boot parameter "loglvl=all")
> > and
> > sending the complete hypervisor log?
> 
> I don't have a package for 4.11 or 4.12 built at all - but I did this
> on 
> 4.10.2-pre (built from staging-4.10).
>
> [..]
>
> Add the CPUs:
> (XEN) Adding cpu 12 to runqueue 0
> (XEN)  First cpu on runqueue, activating
> (XEN) Removing cpu 12 from runqueue 0
> (XEN) Adding cpu 13 to runqueue 0
> (XEN) Removing cpu 13 from runqueue 0
> (XEN) Adding cpu 14 to runqueue 0
> (XEN) Removing cpu 14 from runqueue 0
> (XEN) Xen BUG at sched_credit2.c:3452
> (XEN) Adding cpu 15 to runqueue 0
> (XEN) ----[ Xen-4.10.2-pre  x86_64  debug=n   Not tainted ]----
>
That's not a debug build, though.

It would be useful to test one such build (as suggested by Juergen), to
see if any of the existing ASSERTs triggers.

Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Software Engineer @ SUSE https://www.suse.com/

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