parts.partition_alter2_1_1_innodb fails sporadically in buildbot

parts.partition_alter2_1_1_innodb 'innodb_plugin' w2 [ fail ]

        Test ended at 2015-03-29 21:37:20

CURRENT_TEST: parts.partition_alter2_1_1_innodb

mysqltest: In included file "./suite/parts/inc/partition_trigg1.inc": 

included from ./suite/parts/inc/partition_check.inc at line 972:

included from ./suite/parts/inc/partition_alter_1.inc at line 71:

included from ./suite/parts/inc/partition_alter_11.inc at line 91:

included from ./suite/parts/inc/partition_alter2_1.inc at line 33:

included from /mnt/buildbot/build/mariadb-10.1.3/mysql-test/suite/parts/t/partition_alter2_1_1_innodb.test at line 84:

At line 58: query 'DROP TRIGGER trg_1' failed: 1360: Trigger does not exist

The result from queries just before the failure was:

< snip >

UPDATE t1 SET f_charbig = CONCAT('===',CAST(f_int1 AS CHAR),'===');

INSERT INTO t1(f_int1,f_int2,f_char1,f_char2,f_charbig)

SELECT f_int1,f_int2,f_char1,f_char2,'just inserted' FROM t0_template

WHERE f_int1 BETWEEN @max_row_div2 - 1 AND @max_row_div2 + 1;

INSERT INTO t0_aux(f_int1,f_int2,f_char1,f_char2,f_charbig)

SELECT -f_int1,-f_int1,CAST(-f_int1 AS CHAR),CAST(-f_int1 AS CHAR),

'just inserted' FROM t0_template

WHERE f_int1 BETWEEN @max_row_div2 - 1 AND @max_row_div2 + 1;

CREATE TRIGGER trg_1 BEFORE INSERT ON t0_aux FOR EACH ROW

BEGIN

UPDATE t1 SET f_int1 = -f_int1, f_int2 = -f_int2,

f_charbig = 'updated by trigger'

      WHERE f_int1 = new.f_int1;

END|

INSERT INTO t0_aux(f_int1,f_int2,f_char1,f_char2,f_charbig)

SELECT f_int1,f_int2,f_char1,f_char2,NULL FROM t0_template

WHERE f_int1 BETWEEN @max_row_div2 - 1 AND @max_row_div2 + 1;

# check trigger-1 success: 	0

DROP TRIGGER trg_1;

More results from queries before failure can be found in /mnt/buildbot/build/mariadb-10.1.3/mysql-test/var/2/log/partition_alter2_1_1_innodb.log