As of mysql 5.1.x, the --check-testcases option in mysql-test-run was made the default, although the documentation for it doesn't tell you that. Unfortunately the check-testcases code frequently fails in koji for obscure reasons; what's more it slows down the tests materially. Since it's not really our job to debug the test suite, let's just turn it back off ... diff -Naur mysql-5.1.37.orig/mysql-test/mysql-test-run.pl mysql-5.1.37/mysql-test/mysql-test-run.pl --- mysql-5.1.37.orig/mysql-test/mysql-test-run.pl 2009-07-13 19:09:03.000000000 -0400 +++ mysql-5.1.37/mysql-test/mysql-test-run.pl 2009-08-14 17:40:49.000000000 -0400 @@ -193,7 +193,7 @@ my $opt_skip_core; -our $opt_check_testcases= 1; +our $opt_check_testcases= 0; my $opt_mark_progress; my $opt_sleep;