main.mdev375 fails sporadically

CURRENT_TEST: main.mdev375

mysqltest: At line 24: query 'connect  con2,localhost,root,,' failed: ER_CON_COUNT_ERROR (1040): Too many connections

The result from queries just before the failure was:

set @save_log_warnings=@@log_warnings, @save_max_connections=@@max_connections;

SET GLOBAL log_warnings=4;

SET GLOBAL max_connections=10;

connect  tmp_con1,localhost,root,,;

connect  tmp_con2,localhost,root,,;

connect  tmp_con3,localhost,root,,;

connect  tmp_con4,localhost,root,,;

connect  tmp_con5,localhost,root,,;

connect  tmp_con6,localhost,root,,;

connect  tmp_con7,localhost,root,,;

connect  tmp_con8,localhost,root,,;

connect  con1,localhost,root,,;

SELECT 1;

1

1

diff --git a/sql/sql_connect.cc b/sql/sql_connect.cc

index c279f2663c8..c227fee943e 100644

--- a/sql/sql_connect.cc

+++ b/sql/sql_connect.cc

@@ -1483,6 +1483,7 @@ void do_handle_one_connection(CONNECT *connect, bool put_in_cache)

     if (thd->userstat_running)

       update_global_user_stats(thd, create_user, time(NULL));

+    sleep(1);

     unlink_thd(thd);

     if (IF_WSREP(thd->wsrep_applier, false) || !put_in_cache ||

         !(connect= thread_cache.park()))