catch priorities outside of supported range

src/sched_policies/eager_central_priority_policy.c

@@ -126,6 +126,8 @@ static int _starpu_priority_push_task(struct starpu_task *task)
 
 	STARPU_PTHREAD_MUTEX_LOCK(&data->policy_mutex);
 	unsigned priolevel = task->priority - starpu_sched_ctx_get_min_priority(sched_ctx_id);
+	STARPU_ASSERT_MSG(task->priority >= starpu_sched_ctx_get_min_priority(sched_ctx_id) &&
+			  task->priority <= starpu_sched_ctx_get_max_priority(sched_ctx_id), "task priority %d is not between minimum %d and maximum %d\n", task->priority, starpu_sched_ctx_get_min_priority(sched_ctx_id), starpu_sched_ctx_get_max_priority(sched_ctx_id));
 
 	starpu_task_list_push_back(&taskq->taskq[priolevel], task);
 	taskq->ntasks[priolevel]++;