This happend when you have more than 1024 open Aria tables during checkpoint.
mysql-test/mysql-test-run.pl:
Fixed that variable names are consistent between external and internal server.
mysql-test/suite/maria/suite.pm:
Test for aria-block-size instead of 'aria' as 'aria' is not set for embedded server.
This should be ok for aria tests, as aria is never disabled for these.
storage/maria/ma_checkpoint.c:
Fixed bug when there are more than 1024 open Aria tables during checkpoint.