BUG #13784: cannot create table with table name testtbl

The following bug has been logged on the website:

Bug reference:      13784
Logged by:          biznixcn
Email address:      biznixcn@gmail.com
PostgreSQL version: 9.4.5
Operating system:   Ubuntu 14.04.3 docker container
Description:

As long as the name of table I wanted to create is 'testtbl', the query will
run forever.
CREATE TABLE testtbl (
    did     integer,
    name    varchar(40) UNIQUE
);

No error message