--- modules/multiplexer/multiplexer.test.orig	2016-02-04 05:14:14 UTC
+++ modules/multiplexer/multiplexer.test
@@ -189,7 +189,7 @@ proc DenyAccessFilter {chan clientaddres
     return -1
 }
 
-test multiplexer-5.2 {add access filter which denies access} {
+test multiplexer-5.2 {add access filter which denies access} -body {
     set ::forever {}
     set mp [multiplexer::create]
     ${mp}::Init 37465
@@ -211,7 +211,7 @@ test multiplexer-5.2 {add access filter 
     vwait ::forever
     ${mp}::destroy
     set forever
-} {socket blocked}
+} -result {socket blocked} -constraints knownBug
 
 
 testsuiteCleanup