TokuDB tests fail in buildbot with Assertion `global_status_var.global_memory_used == 0'

tokudb_bugs.PS-3773                      w4 [ fail ]  Found warnings/errors in server log file!

        Test ended at 2018-09-15 07:25:53

line

mysqld: /home/buildbot/buildbot/build/sql/mysqld.cc:2176: void mysqld_exit(int): Assertion `global_status_var.global_memory_used == 0' failed.

Attempting backtrace. You can use the following information to find out

^ Found warnings in /usr/local/mariadb-10.2.18-linux-x86_64/mysql-test/var/4/log/mysqld.1.err

ok

 - found 'core.31336' (4/0)

Trying 'dbx' to get a backtrace

worker[4] > Restart  - not started

gdb not found, cannot get the stack trace

Compressed file /usr/local/mariadb-10.2.18-linux-x86_64/mysql-test/var/4/log/tokudb_bugs.PS-3773/mysqld.1/data/core.31336

 - found 'core.20404' (5/0)

Trying 'dbx' to get a backtrace

gdb not found, cannot get the stack trace

Compressed file /usr/local/mariadb-10.2.18-linux-x86_64/mysql-test/var/4/log/tokudb_bugs.PS-3773/mysqld.1/data/core.20404

 - skipping '/usr/local/mariadb-10.2.18-linux-x86_64/mysql-test/var/4/log/tokudb_bugs.PS-3773/'

Failing test(s): tokudb.compressions tokudb.dir_per_db_rename_to_nonexisting_schema tokudb_bugs.PS-3773 tokudb_bugs.frm_store tokudb_bugs.frm_store2 tokudb_bugs.frm_store3