Index: libcfa/src/concurrency/kernel/startup.cfa
===================================================================
--- libcfa/src/concurrency/kernel/startup.cfa	(revision 639e4fc03a02dc79f5ba9c49c73a1e8b6ae95701)
+++ libcfa/src/concurrency/kernel/startup.cfa	(revision 1553a5552a430f9af78a97c35d5fc3629d0910c2)
@@ -513,4 +513,8 @@
 	rdy_link.next = 0p;
 	rdy_link.ts   = MAX;
+	user_link.next = 0p;
+	user_link.prev = 0p;
+	cltr_link.next = 0p;
+	cltr_link.prev = 0p;
 	preferred = ready_queue_new_preferred();
 	last_proc = 0p;
Index: libcfa/src/concurrency/thread.cfa
===================================================================
--- libcfa/src/concurrency/thread.cfa	(revision 639e4fc03a02dc79f5ba9c49c73a1e8b6ae95701)
+++ libcfa/src/concurrency/thread.cfa	(revision 1553a5552a430f9af78a97c35d5fc3629d0910c2)
@@ -46,4 +46,8 @@
 	rdy_link.next = 0p;
 	rdy_link.ts   = MAX;
+	user_link.next = 0p;
+	user_link.prev = 0p;
+	cltr_link.next = 0p;
+	cltr_link.prev = 0p;
 	preferred = ready_queue_new_preferred();
 	last_proc = 0p;