--- old/src/share/vm/compiler/disassembler.hpp	2016-02-08 14:14:45.150656467 +0100
+++ new/src/share/vm/compiler/disassembler.hpp	2016-02-08 14:14:45.026656462 +0100
@@ -85,6 +85,7 @@
 
  public:
   static bool can_decode() {
+    ttyLocker tl;
     return (_decode_instructions_virtual != NULL) ||
            (_decode_instructions != NULL) ||
            load_library();