$ perl ./mtr sys_vars.secure_file_priv --mem

Logging: ./mtr  sys_vars.secure_file_priv --mem

vardir: /home/elenst/maria-5.5/mysql-test/var

Checking leftover processes...

Removing old var directory...

Creating var directory '/home/elenst/maria-5.5/mysql-test/var'...

 - symlinking 'var' to '/dev/shm/var_auto_37xY'

Checking supported features...

MariaDB Version 5.5.29-MariaDB-debug

Installing system database...

 - skipping ndbcluster

 - SSL connections supported

 - binaries are debug compiled

Collecting tests...

Using server port 38181

==============================================================================

TEST                                      RESULT   TIME (ms) or COMMENT

--------------------------------------------------------------------------

worker[1] Using MTR_BUILD_THREAD 300, with reserved ports 16000..16019

sys_vars.secure_file_priv                [ fail ]

        Test ended at 2013-01-21 16:08:46

CURRENT_TEST: sys_vars.secure_file_priv

/home/elenst/maria-5.5/client/mysqltest: Error on delete of '/home/elenst/maria-5.5/mysql-test/var/mysqld.1/data//../../../bug50373.txt' (Errcode: 2)

mysqltest: At line 19: command "remove_file" failed with error: 1  my_errno: 2  errno: 2

The result from queries just before the failure was:

< snip >

# Bug50373 --secure-file-priv=""

#

CREATE TABLE t1 (c1 VARCHAR(50));

INSERT INTO t1 VALUES ("one"),("two"),("three"),("four"),("five");

SHOW VARIABLES LIKE 'secure_file_priv';

Variable_name	Value

secure_file_priv	

test/var/mysqld.1/data//../../../bug50373.txt

c1

one

two

three

four

five

loaded_file

NULL

More results from queries before failure can be found in /home/elenst/maria-5.5/mysql-test/var/log/secure_file_priv.log