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I'm also in this trouble. This occurs when run the patched user_data2.py and subscribing "/server_name/smach/container_status" topic.

File "/opt/ros/electric/stacks/executive_smach/smach_msgs/src/smach_msgs/msg/_SmachContainerStatus.py", line 120, in serialize
    buff.write(struct.pack('<I%ss'%length, length, _x.encode()))
UnicodeDecodeError: 'ascii' codec can't decode byte 0x80 in position 0: ordinal not in range(128)

When I modified the introspection.py, the error does not occur.

diff -r 46cddfcd1bf3 smach_ros/src/smach_ros/introspection.py
--- a/smach_ros/src/smach_ros/introspection.py  Tue Aug 02 10:31:19 2011 -0700
+++ b/smach_ros/src/smach_ros/introspection.py  Thu Sep 29 22:31:48 2011 +0900
@@ -219,7 +219,7 @@
                     path,
                     self._container.get_initial_states(),
                     self._container.get_active_states(),
-                    pickle.dumps(self._container.userdata._data,2),
+                    "",
                     info_str)
             # Publish message
             self._status_pub.publish(state_msg)