- mysql-test-run.pl --valgrind complains when all tests succeed.

 - perfschema.all_instances fail on non-linux, where ENABLE_TEMP_POOL
   is not set and therefore BITMAP mutex is not used.

 - MDEV-132: main.mysqldump fails because it depends on exact size of stdio
   buffers.

 - MDEV-99: rpl.rpl_cant_read_event_incident fails due to a race where the
   slave manages to connect while the test case is in the middle of setting up
   the master, causing the slave to replicate extra/wrong events.

 - MDEV-133: rpl.rpl_rotate_purge_deadlock fails because it issues a
   DEBUG_SYNC SIGNAL immediately followed by RESET; this means that sometimes
   the intended receipient has no time to see the signal before it is cleared
   by the RESET, causing wait to timeout.