mysql_client_test: test_ps_query_cache fails with group-concat-max-len=1M

nirbhay@nirbhay-vbox:~/project/git-repo/mariadb/10.1/install/mysql-test$ perl mtr main.mysql_client_test --mysqld=--group-concat-max-len=1K

Logging: mtr  main.mysql_client_test --mysqld=--group-concat-max-len=1K

vardir: /home/nirbhay/project/git-repo/mariadb/10.1/install/mysql-test/var

Checking leftover processes...

Removing old var directory...

Creating var directory '/home/nirbhay/project/git-repo/mariadb/10.1/install/mysql-test/var'...

Checking supported features...

MariaDB Version 10.1.19-MariaDB-debug

 - SSL connections supported

 - binaries are debug compiled

Collecting tests...

Installing system database...

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

TEST                                      RESULT   TIME (ms) or COMMENT

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

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

main.mysql_client_test                   [ pass ]  43368

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

The servers were restarted 0 times

Spent 43.368 of 50 seconds executing testcases

Completed: All 1 tests were successful.

nirbhay@nirbhay-vbox:~/project/git-repo/mariadb/10.1/install/mysql-test$ perl mtr main.mysql_client_test --mysqld=--group-concat-max-len=1M

Logging: mtr  main.mysql_client_test --mysqld=--group-concat-max-len=1M

vardir: /home/nirbhay/project/git-repo/mariadb/10.1/install/mysql-test/var

Checking leftover processes...

Removing old var directory...

Creating var directory '/home/nirbhay/project/git-repo/mariadb/10.1/install/mysql-test/var'...

Checking supported features...

MariaDB Version 10.1.19-MariaDB-debug

 - SSL connections supported

 - binaries are debug compiled

Collecting tests...

Installing system database...

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

TEST                                      RESULT   TIME (ms) or COMMENT

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

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

main.mysql_client_test                   [ fail ]

        Test ended at 2016-10-18 14:32:02

CURRENT_TEST: main.mysql_client_test

mysqltest: At line 19: exec of '/home/nirbhay/project/git-repo/mariadb/10.1/install/bin/mysql_client_test --defaults-file=/home/nirbhay/project/git-repo/mariadb/10.1/install/mysql-test/var/my.cnf --testcase --vardir=/home/nirbhay/project/git-repo/mariadb/10.1/install/mysql-test/var --getopt-ll-test=25600M >> /home/nirbhay/project/git-repo/mariadb/10.1/install/mysql-test/var/log/mysql_client_test.out.log 2>&1' failed, error: 256, status: 1, errno: 2

Output from before failure:

call mtr.add_suppression(" Error reading file './client_test_db/test_frm_bug.frm'");

The result from queries just before the failure was:

SET @old_general_log= @@global.general_log;

SET @old_slow_query_log= @@global.slow_query_log;

call mtr.add_suppression(" Error reading file './client_test_db/test_frm_bug.frm'");

 - saving '/home/nirbhay/project/git-repo/mariadb/10.1/install/mysql-test/var/log/main.mysql_client_test/' to '/home/nirbhay/project/git-repo/mariadb/10.1/install/mysql-test/var/log/main.mysql_client_test/'

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

The servers were restarted 0 times

Spent 0.000 of 13 seconds executing testcases

Failure: Failed 1/1 tests, 0.00% were successful.

Failing test(s): main.mysql_client_test

$cat var/log/mysql_client_test.out.log

...

#####################################

209 of (1/1): test_ps_query_cache

#####################################

...

 row 2: 1, ii(2)

 row 3: 2, ii(2)/home/nirbhay/project/git-repo/mariadb/10.1/tests/mysql_client_test.c:2455: check failed: 'hits1-hits2 == 1'

MySQL error 0:

...