diff --git a/.bzrignore b/.bzrignore
index 5e2aa892c28..348093af390 100644
--- a/.bzrignore
+++ b/.bzrignore
@@ -1066,3 +1066,4 @@ vio/test-sslserver
 vio/viotest-ssl
 include/check_abi
 include/mysql_h.ic
+mysql-test/r/blackhole.log
diff --git a/mysql-test/mysql-test-run.pl b/mysql-test/mysql-test-run.pl
index 3046e5ba2fe..72b4fe95132 100755
--- a/mysql-test/mysql-test-run.pl
+++ b/mysql-test/mysql-test-run.pl
@@ -2624,6 +2624,7 @@ sub install_db ($$) {
   mtr_add_arg($args, "--skip-innodb");
   mtr_add_arg($args, "--skip-ndbcluster");
   mtr_add_arg($args, "--tmpdir=.");
+  mtr_add_arg($args, "--core-file");
 
   if ( $opt_debug )
   {