diff -rup Beaker-1.9.1-orig/beaker/container.py Beaker-1.9.1/beaker/container.py
--- Beaker-1.9.1-orig/beaker/container.py	2018-04-10 10:23:04.000000000 +0200
+++ Beaker-1.9.1/beaker/container.py	2018-04-10 10:23:34.000000000 +0200
@@ -353,13 +353,13 @@ class Value(object):
                 debug("get_value returning old value while new one is created")
                 return value
             else:
-                debug("lock_creatfunc (didnt wait)")
+                debug("lock_creatfunc `%s` (didnt wait)", self.createfunc.__name__)
                 has_createlock = True

         if not has_createlock:
-            debug("lock_createfunc (waiting)")
+            debug("lock_createfunc `%s` (waiting)", self.createfunc.__name__)
             creation_lock.acquire()
-            debug("lock_createfunc (waited)")
+            debug("lock_createfunc `%s` (waited)", self.createfunc.__name__)

         try:
             # see if someone created the value already