Re: [Xen-devel] Re: [Xen-users] Xen 4.1.1 crash when manipulating cpupools.

[Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>]

On 11/14/2011 12:13 PM, George Dunlap wrote:
> On Mon, 2011-11-14 at 09:20 +0000, Juergen Gross wrote:
> > On 11/11/2011 10:18 PM, andrewpitman@xxxxxxxxxxx wrote:
> > > Juergen,
> > >
> > > It doesn't look like this has been fixed.  I managed to get my 4.1.2
> > > server to crash when setting the weight of Domain-0 (running in
> > > Pool-0 using credit2) and again when moving some cpus into a new
> > > cpupool which was set up to use the credit2 scheduler.
> > Yeah, I could reproduce your problems on my machine.
> >
> > George, I see two problems in credit2:
> >
> > - when setting the weight of dom0, vcpu_schedule_lock_irq(current)
> > will be
> >    taken in sched_adjust() of schedule.c and again in csched_dom_cntl()
> > of
> >    sched_credit2.c resulting in a deadlock.
> Yes, this one was recently brought to my attention.  Unfortunately I'm
> not sure when I'm going to be able to get to it.
>
> My big problem is actually testing; I don't have a good way to test
> xen-unstable effectively right now.  Juergen, if I were to send you a
> prototype patch, could you test it and fix it up if it doesn't work
> exactly right?
Sure.


Juergen

--
Juergen Gross                 Principal Developer Operating Systems
PDG ES&S SWE OS6                       Telephone: +49 (0) 89 3222 2967
Fujitsu Technology Solutions              e-mail: juergen.gross@xxxxxxxxxxxxxx
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