Re: [Xen-devel] Core Scheduling "lock == schedule_lock" assertion failure

[Jürgen Groß <jgross@xxxxxxxx>]

On 13.02.20 15:19, Sergey Dyasli wrote:
> On 12/02/2020 12:24, Jürgen Groß wrote:
> > On 12.02.20 12:21, Sergey Dyasli wrote:
> > > Hi Juergen,
> > >
> > > Recently our testing has found a host crash which is reproducible.
> > > Do you have any idea what might be going on here?
> > Oh, nice catch!
> >
> > The problem is that get_cpu_idle_time() is calling vcpu_runstate_get()
> > for an idle vcpu. This is fragile as idle vcpus are sometimes assigned
> > temporarily to normal scheduling units, thus the ASSERT() in the unlock
> > function is failing when the assignment of the idle vcpu is modified
> > under the feet of vcpu_runstate_get() and the unit it has been assigned
> > to before is already scheduled on another cpu.
> >
> > The patch is rather easy, though. Can you try it, please?
> Thank you for the patch! I put it into testing yesterday and it looks
> good so far. It also seems that the issue is well understood and the
> patch should go into the main tree.
Just wanted to make sure it really fixes your problem. :-)


Juergen

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