Re: [xen-4.7-testing test] 105948: regressions - FAIL

[Dario Faggioli <dario.faggioli@citrix.com>]

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On Wed, 2017-02-22 at 01:46 -0700, Jan Beulich wrote:
> > > > On 22.02.17 at 01:02, <andrew.cooper3@citrix.com> wrote:
> > (XEN) Xen call trace:
> > (XEN)    [<ffff82d080126e70>]
> > sched_credit2.c#vcpu_is_migrateable+0x22/0x9a
> > (XEN)    [<ffff82d080129763>]
> > sched_credit2.c#csched2_schedule+0x823/0xb4e
> > (XEN)    [<ffff82d08012c17e>] schedule.c#schedule+0x108/0x609
> > (XEN)    [<ffff82d08012f8bd>] softirq.c#__do_softirq+0x7f/0x8a
> > (XEN)    [<ffff82d08012f912>] do_softirq+0x13/0x15
> > (XEN)    [<ffff82d080164b17>] domain.c#idle_loop+0x55/0x62
> > (XEN)
> > (XEN)
> > (XEN) ****************************************
> > (XEN) Panic on CPU 14:
> > (XEN) Assertion 'd->cpupool != NULL' failed at
> > ...5948.build-amd64/xen/xen/include/xen/sched-if.h:200
> > (XEN) ****************************************
> > (XEN)
> > (XEN) Manual reset required ('noreboot' specified)
> > 
> > I am guessing the most recent credit2 backports weren't quite so
> > safe?
> 
> Well, there was only one in the batch under test (and that is what
> adds the cpupool_domain_cpumask() causing the ASSERT() above
> to trigger). However, comparing with the staging version of the file
> (which is heavily different), the immediate code involved here isn't
> all that different, so I wonder whether (a) this is a problem on
> staging too or (b) we're missing another backport.
>
Yeah, I also wonder in which of these two situations we are. Staging
looks fine, as far as my testing goes, and also according, e.g., to:

http://logs.test-lab.xenproject.org/osstest/logs/105946/test-amd64-amd64-xl-credit2/info.html

Or:

http://logs.test-lab.xenproject.org/osstest/logs/105900/test-amd64-amd64-xl-credit2/info.html

There appear to have been a problem, in a different test step, though,
here:
http://logs.test-lab.xenproject.org/osstest/logs/105919/test-amd64-amd64-xl-credit2/info.html

Which I noticed yesterday afternoon and am currently looking into it,
because I don't see what has actually gone wrong.

Also, looking at the history of Credit2 tests in 4.7-testing:
http://logs.test-lab.xenproject.org/osstest/results/history/test-amd64-amd64-xl-credit2/xen-4.7-testing

Things were fine on 2017-02-16, and have started failing 2017-02-20.

>  Dario?
> 
I will investigate.

Thanks and Regards,
Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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