some mysql tests do not run in parallel for some reason

any ideas on what might be going on?

with version mysql-5.6.14-linux-glibc2.5-x86_64

./mtr --suite=parts --do-test='.*myisam' --max-test-fail=0 --force
all tests pass

./mtr --suite=parts --do-test='.*myisam' --max-test-fail=0 --force
--parallel=auto
some tests fail.  here is an example:

parts.partition_max_sub_parts_key_list_myisam w1 [ fail ]
Test ended at 2013-11-01 09:06:00

CURRENT_TEST: parts.partition_max_sub_parts_key_list_myisam
mysqltest: In included file
"./suite/parts/inc/partition_max_sub_parts_key_list.inc":
included from ./suite/parts/inc/partition_max_sub_parts_key_list.inc at line 75:
At line 75: query 'load data infile '$MYSQL_TMP_DIR/data01' into table
t2 partition (p4095) fields terminated by ','' failed: 1290: The MySQL
server is running with the --secure-file-priv option so it cannot
execute this statement

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