innodb.table_flags failed in buildbot with Server failed to restart

innodb.table_flags '32k,release,xtradb'  w3 [ fail ]

        Test ended at 2019-04-19 18:57:10

CURRENT_TEST: innodb.table_flags

mysqltest: In included file "./include/wait_until_connected_again.inc": 

included from ./include/start_mysqld.inc at line 18:

included from /usr/local/mariadb-10.1.39-linux-x86_64/mysql-test/suite/innodb/t/table_flags.test at line 162:

At line 26: Server failed to restart

The result from queries just before the failure was:

< snip >

 SPACE=0x00000004)

header=0x060008030000 (NAME=0x73757072656d756d00)

SHOW CREATE TABLE tr;

Table	Create Table

tr	CREATE TABLE `tr` (

  `a` int(11) NOT NULL,

  PRIMARY KEY (`a`)

) ENGINE=InnoDB DEFAULT CHARSET=latin1 ROW_FORMAT=REDUNDANT

INSERT INTO tr VALUES(42);

SHOW CREATE TABLE tc;

ERROR 42S02: Table 'test.tc' doesn't exist in engine

SHOW CREATE TABLE td;

ERROR 42S02: Table 'test.td' doesn't exist in engine

SHOW CREATE TABLE tz;

ERROR 42S02: Table 'test.tz' doesn't exist in engine

SHOW CREATE TABLE tp;

ERROR 42S02: Table 'test.tp' doesn't exist in engine

FOUND /InnoDB: Table '.test.\..t[cdzp].' in InnoDB data dictionary has unknown type (81|f21|121|302[13])\b/ in mysqld.1.err

FOUND /InnoDB: Cannot open table test/t[cdzp] from the internal data dictionary of InnoDB/ in mysqld.1.err

Restoring SYS_TABLES clustered index root page (8)