Re: [Xen-devel] [PATCH v3] xen: credit2: fix spinlock irq-safety violation

[George Dunlap <george.dunlap@xxxxxxxxxx>]

On 09/21/2017 01:30 AM, Dario Faggioli wrote:
> In commit ad4b3e1e9df34 ("xen: credit2: implement
> utilization cap") xfree() was being called (for
> deallocating the budget replenishment timer, during
> domain destruction) inside an IRQ disabled critical
> section.
> 
> That must not happen, as it uses the mem-pool's lock,
> which needs to be taken with IRQ enabled. And, in fact,
> we crash (in debug builds):
> 
> (XEN) ****************************************
> (XEN) Panic on CPU 0:
> (XEN) Xen BUG at spinlock.c:47
> (XEN) ****************************************
> 
> Let's, therefore, kill and deallocate the timer outside of
> the critical sections, when IRQs are enabled.
> 
> Signed-off-by: Dario Faggioli <dario.faggioli@xxxxxxxxxx>

Reviewed-by: George Dunlap <george.dunlap@xxxxxxxxxx>

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