diff --git a/xen/common/sched_null.c b/xen/common/sched_null.c
index 26c6f0f129..afd42e552f 100644
--- a/xen/common/sched_null.c
+++ b/xen/common/sched_null.c
@@ -455,6 +455,7 @@ static void null_vcpu_insert(const struct scheduler *ops, struct vcpu *v)
 
     if ( unlikely(!is_vcpu_online(v)) )
     {
+        dprintk(XENLOG_G_INFO, "Not inserting %pv (not online!)\n", v);
         vcpu_schedule_unlock_irq(lock, v);
         return;
     }
@@ -516,6 +517,7 @@ static void null_vcpu_remove(const struct scheduler *ops, struct vcpu *v)
     /* If offline, the vcpu shouldn't be assigned, nor in the waitqueue */
     if ( unlikely(!is_vcpu_online(v)) )
     {
+        dprintk(XENLOG_G_INFO, "Not removing %pv (wasn't online!)\n", v);
         ASSERT(per_cpu(npc, v->processor).vcpu != v);
         ASSERT(list_empty(&nvc->waitq_elem));
         goto out;
@@ -635,6 +637,8 @@ static void null_vcpu_sleep(const struct scheduler *ops, struct vcpu *v)
         }
         else if ( per_cpu(npc, cpu).vcpu == v )
             tickled = vcpu_deassign(prv, v);
+
+        dprintk(XENLOG_G_INFO, "%pv is, apparently, going offline (tickled=%d)\n", v, tickled);
     }
 
     /* If v is not assigned to a pCPU, or is not running, no need to bother */
@@ -697,6 +701,8 @@ static void null_vcpu_migrate(const struct scheduler *ops, struct vcpu *v,
      */
     if ( unlikely(!is_vcpu_online(v)) )
     {
+        dprintk(XENLOG_G_INFO, "%pv is, apparently, going offline\n", v);
+
         spin_lock(&prv->waitq_lock);
         list_del_init(&nvc->waitq_elem);
         spin_unlock(&prv->waitq_lock);