InnoDB fails to drop large temporary table on disconnect

innodb.sp_temp_table 'xtradb'            w2 [ fail ]  Found warnings/errors in server log file!

        Test ended at 2018-06-27 22:34:49

line

2018-06-27 22:34:48 139627042478848 [Warning] Could not remove temporary table: '/mnt/buildbot/build/mariadb-10.1.35/mysql-test/var/tmp/2/mysqld.1/#sql32e0_3_0', error: 2

^ Found warnings in /mnt/buildbot/build/mariadb-10.1.35/mysql-test/var/2/log/mysqld.1.err

ok

 - saving '/mnt/buildbot/build/mariadb-10.1.35/mysql-test/var/2/log/innodb.sp_temp_table-xtradb/' to '/mnt/buildbot/build/mariadb-10.1.35/mysql-test/var/log/innodb.sp_temp_table-xtradb/'

worker[2] > Restart  - not started