RPC Server won't go quietly

Trying to do a controlled shutdown of hbase, the RPC Server spews the following ugly output:

unknown-208-76-47-46:~/Documents/checkouts/hadoop-trunk stack$ ./src/contrib/hbase/bin/hbase master stop
07/05/24 12:53:47 INFO ipc.Server: Stopping server on 60000
07/05/24 12:53:47 INFO ipc.Server: IPC Server handler 0 on 60000 caught: java.lang.InterruptedException
java.lang.InterruptedException
at java.lang.Object.wait(Native Method)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:541)
07/05/24 12:53:47 INFO ipc.Server: IPC Server handler 0 on 60000: exiting
unknown-208-76-47-46:~/Documents/checkouts/hadoop-trunk stack$ 07/05/24 12:53:47 INFO ipc.Server: IPC Server handler 1 on 600
00 caught: java.lang.InterruptedException
java.lang.InterruptedException
at java.lang.Object.wait(Native Method)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:541)
07/05/24 12:53:47 INFO ipc.Server: IPC Server handler 2 on 60000 caught: java.lang.InterruptedException
java.lang.InterruptedException
at java.lang.Object.wait(Native Method)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:541)
...

You get the same noise when if run the TestIPC unit test.