Lingering replication slots

Hi,

A newbie question: how do I delete lingering replication slots? When creating Subscription for logical replication, the CREATE SUBSCRIPTION stuck and didn't return. After ctrl-c and aborted the command, the master database have lingering replication slots that I can't delete because the active is true. Do I just kill the pid?

Thanks!

SELECT * FROM pg_replication_slots ;

slot_name | plugin | slot_type | datoid | database | temporary | active | active_pid | xmin | catalog_xmin | restart_lsn | confirmed_flush_lsn

--------------+----------+-----------+----------+----------------+-----------+--------+------------+------+--------------+--------------+---------------------

support_sub2 | pgoutput | logical | 28384483 | dragon_support | f | t | 29566 | | 96562907 | 5108/29C1610 |

support_sub | pgoutput | logical | 28384483 | dragon_support | f | t | 27253 | | 96562907 | 5108/2858880 |