Test funcs_1.processlist_priv_no_prot is unstable

On 5.6 trunk:

funcs_1.processlist_priv_no_prot w3 [ fail ]
        Test ended at 2017-03-17 12:46:39

CURRENT_TEST: funcs_1.processlist_priv_no_prot
--- /mnt/workspace/percona-server-5.6-trunk/BUILD_TYPE/release/Host/ubuntu-yakkety-64bit/mysql-test/suite/funcs_1/r/processlist_priv_no_prot.result 2017-03-17 15:08:56.498640299 +0300
+++ /mnt/workspace/percona-server-5.6-trunk/BUILD_TYPE/release/Host/ubuntu-yakkety-64bit/build/mysql-test/var/3/log/processlist_priv_no_prot.reject 2017-03-17 15:46:39.377526226 +0300
@@ -3,484 +3,15 @@
 1 Prepare test.
 connection default (user=root)
 ####################################################################################
-####################################################################################
-1.1 Create two user
-####################################################################################
...
-DROP USER ''@'localhost';
+This test expects one connection to the server.
+Expectation: USER HOST DB COMMAND STATE INFO
+Expectation: root localhost information_schema Query executing SELECT USER,HOST,DB,COMMAND,STATE,INFO FROM processlist ORDER BY ID
+But we found in the moment:
+SELECT USER,HOST,DB,COMMAND,STATE,INFO FROM processlist ORDER BY ID;
+USER HOST DB COMMAND STATE INFO
+root localhost NULL Sleep NULL
+root localhost information_schema Query executing SELECT USER,HOST,DB,COMMAND,STATE,INFO FROM processlist ORDER BY ID
+Maybe
+- the base configuration (no of parallel auxiliary sessions) of the server has changed
+- a parallel test intended for another server accidently connected to our current one
+We cannot proceed in this situation. Abort