Index: libcfa/src/concurrency/ready_subqueue.hfa
===================================================================
--- libcfa/src/concurrency/ready_subqueue.hfa	(revision eb5962a78fb1dd3369887e6341b879ed4926e450)
+++ libcfa/src/concurrency/ready_subqueue.hfa	(revision b62d1d6ee15cbd91b210ef42a6e22ea54211af55)
@@ -49,5 +49,5 @@
 	// Get the relevant nodes locally
 	this.prev->link.next = node;
-	this.prev->link.ts   = rdtscl();
+	__atomic_store_n(&this.prev->link.ts, rdtscl(), __ATOMIC_RELAXED);
 	this.prev = node;
 	#if !defined(__CFA_NO_STATISTICS__)
Index: tests/pybin/tools.py
===================================================================
--- tests/pybin/tools.py	(revision eb5962a78fb1dd3369887e6341b879ed4926e450)
+++ tests/pybin/tools.py	(revision b62d1d6ee15cbd91b210ef42a6e22ea54211af55)
@@ -46,5 +46,5 @@
 
 			print(cmd)
-			return 0, None
+			return 0, None, None
 
 		with contextlib.ExitStack() as onexit:
@@ -291,5 +291,5 @@
 ################################################################################
 def jobserver_version():
-	make_ret, out, err = sh('make', '.test_makeflags', '-j2', output_file=subprocess.PIPE, error=subprocess.PIPE)
+	make_ret, out, err = sh('make', '.test_makeflags', '-j2', ignore_dry_run = True, output_file=subprocess.PIPE, error=subprocess.PIPE)
 	if make_ret != 0:
 		print("ERROR: cannot find Makefile jobserver version", file=sys.stderr)