Galera test failure on galera.MW-44

galera.MW-44 'xtradb'                    w2 [ fail ]

        Test ended at 2018-08-31 16:07:06

CURRENT_TEST: galera.MW-44

mysqltest: At line 15: query 'SET GLOBAL general_log='OFF'' failed: 1213: Deadlock found when trying to get lock; try restarting transaction

The result from queries just before the failure was:

SET GLOBAL general_log='OFF';

TRUNCATE TABLE mysql.general_log;

SET GLOBAL general_log='OFF';

 - saving '/dev/shm/var/2/log/galera.MW-44-xtradb/' to '/dev/shm/var/log/galera.MW-44-xtradb/'

Retrying test galera.MW-44, attempt(2/3)...

worker[2] > Restart  - not started

worker[2] > Restart  - not started

***Warnings generated in error logs during shutdown after running tests: galera.MW-44