database shutdown hang due to walsender

Hi,
Postgresql13.4 on RHEL8.4 , this server setup publication as logical replication source (an open source tool named Debezium replicate data from this Postgres database as source ), we found systemctl stop postgresql-13 hang there long time , and use pg_ctl stop

$ pg_ctl stop
waiting for server to shut down............................................................... failed
pg_ctl: server does not shut down

manually kill walsender , try gain pg_ctl stop it soon got stopped.

postgres 3291450 3287667 84 08:45 ? 00:05:42 postgres: walsender splex_deny xx.xxx.xxx.xxx(32958) idle

looks like walsender blocking PG shutdown forever. From pglogs

2022-06-23 07:45:20.107 UTC::@:[179416]:[6206-1]::2022-05-16 01:34:02 UTCLOG: received fast shutdown request
2022-06-23 07:45:20.107 UTC::@:[179416]:[6207-1]::2022-05-16 01:34:02 UTCLOG: aborting any active transactions
...
2022-06-23 07:45:20.133 UTC::@:[179416]:[6209-1]::2022-05-16 01:34:02 UTCLOG: background worker "logical replication launcher" (PID 179429) exited with exit code 1

Thanks,

James