this assert is no longer valid with the recent code improvements from Samuel

src/core/dependencies/data_arbiter_concurrency.c

@@ -492,7 +492,6 @@ void _starpu_submit_job_enforce_arbitered_deps(struct _starpu_job *j, unsigned b
 
 			_starpu_spin_lock(&cancel_handle->header_lock);
 			/* reset the counter because finally we do not take the data */
-			STARPU_ASSERT(cancel_handle->refcnt == 1);
 			cancel_handle->refcnt--;
 			STARPU_ASSERT(cancel_handle->busy_count > 0);
 			cancel_handle->busy_count--;