Re: [Xen-devel] 4.11.0 RC1 panic

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 24.04.18 at 18:06, <bouyer@xxxxxxxxxxxxxxx> wrote:
> Hello,
> I tested xen 4.11.0 rc1 with NetBSD as dom0.
> I could boot a NetBSD PV domU without problem, but at shutdown time 
> (poweroff
> in the domU), I got a Xen panic:
> (XEN) Assertion 'cpu < nr_cpu_ids' failed at 
> ...1/work/xen-4.11.0-rc1/xen/include/xen/cpumask.h:97
> 
> A xl destroy instead of poweroff gives the same result.
> 
> This happens with both 32bitsPAE and 64bits domU. This doens't seem to
> happen with HVM domUs.
> 
> Attached are a cut-n-paste of the panic, and the output of xl demsg.

Without line numbers associated with at least the top stack trace entry
I can only guess what it might be - could you give the patch below a try?
(This may not be the final patch, as I'm afraid there may be some race
here, but I'd have to work this out later.)

Jan

--- unstable.orig/xen/arch/x86/mm.c
+++ unstable/xen/arch/x86/mm.c
@@ -1255,7 +1255,7 @@ void put_page_from_l1e(l1_pgentry_t l1e,
         {
             for_each_vcpu ( pg_owner, v )
             {
-                if ( pv_destroy_ldt(v) )
+                if ( pv_destroy_ldt(v) && v->dirty_cpu != VCPU_CPU_CLEAN )
                     flush_tlb_mask(cpumask_of(v->dirty_cpu));
             }
         }



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