D30725.id90777.diff
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	Index: sys/xen/xen_intr.c
	===================================================================
	--- sys/xen/xen_intr.c
	+++ sys/xen/xen_intr.c
	@@ -769,6 +769,9 @@
	for (i = 0; i < nitems(s->evtchn_mask); i++)
	atomic_store_rel_long(&s->evtchn_mask[i], ~0);

	+ /* Protect xen_intr_port_to_isrc[] / ->xi_port */
	+ mtx_lock(&xen_intr_isrc_lock);
	+
	/* Clear existing port mappings */
	for (isrc_idx = 0; isrc_idx < NR_EVENT_CHANNELS; ++isrc_idx)
	if (xen_intr_port_to_isrc[isrc_idx] != NULL)
	@@ -805,6 +808,9 @@
	cur = next;
	} while (cur != NULL);
	}
	+
	+ /* Done with xen_intr_port_to_isrc[] / ->xi_port */
	+ mtx_unlock(&xen_intr_isrc_lock);
	}
	#endif