Index: libcfa/src/concurrency/io.cfa
===================================================================
--- libcfa/src/concurrency/io.cfa	(revision 8ae4165a41b46016828a17bdeb68b98d7a593162)
+++ libcfa/src/concurrency/io.cfa	(revision 7bfc849b1e747001a02088452ff80d68cf72b4cc)
@@ -802,4 +802,6 @@
 			#endif
 
+			ring.submit_q.sqes[ idx & mask ].user_data = 0;
+
 			unlock(ring.submit_q.lock);