regression/mutex.ok

   1 exiting
   2 starting
   3 starting
   4 starting
   5 starting
   6 starting
   7 starting
   8 starting
   9 starting
  10 starting
  11 starting
  12 exiting
  13 exiting
  14 exiting
  15 exiting
  16 exiting
  17 exiting
  18 exiting
  19 exiting
  20 exiting
  21 exiting