galera_shutdown_nonprim: mysql_shutdown failed

CURRENT_TEST: galera.galera_shutdown_nonprim

mysqltest: In included file "/usr/share/mysql-test/suite/galera/include/shutdown_mysqld.inc": 

included from /usr/share/mysql-test/suite/galera/t/galera_shutdown_nonprim.test at line 26:

At line 16: mysql_shutdown failed

The result from queries just before the failure was:

connection node_2;

connection node_1;

connection node_1;

connection node_2;

connection node_1;

SET GLOBAL wsrep_provider_options = 'pc.weight=2';

connection node_2;

SET GLOBAL wsrep_provider_options = 'gmcast.isolate = 1';

SET SESSION wsrep_sync_wait = 0;

 - saving '/dev/shm/var/1/log/galera.galera_shutdown_nonprim-innodb/' to '/dev/shm/var/log/galera.galera_shutdown_nonprim-innodb/'

Retrying test galera.galera_shutdown_nonprim, attempt(2/3)...

worker[01] > Restart  - not started