/usr/lib/mysql-testsuite/t/percona_bug1266980.test is in percona-server-test-5.6 5.6.22-rel71.0-0ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | # crash in group_concat in case of syntax error in prev group_concat
--error 1064
SELECT GROUP_CONCAT(1, 2 ORDER BY 1, , );
SELECT GROUP_CONCAT(1, 2 ORDER BY 1);
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