pg_ctl -D PGDATA stop -m fast gets the following message 57P03 FATAL: thedatabase system is shutting down

1) the recovery.conf was created
2) the pg_basebackup comand was called:

pg_basebackup -h node01 -U dbuser -D /var/PostgresDb -p 5432 -w
pg_ctl -D  /var/PostgresDb  start -w

Configuration files postgresql.conf  and pg_hba.conf from the master and standby nodes have been attached to the mail.
I was able to get some information about the replication by the following sql queries:

select * from pg_stat_replication   # on master node
select * from pg_stat_wal_receiver  # on standby node

In order to stop database server on master node I invoked the command at 07:15:49:

pg_ctl –D /var/PostgresDb stop –m fast.

The most of the postgres processes were terminated but some of them remained to be working.
Here is the list of postgres processes on the master node:

ps -ef|grep postgres
postgres  8418     1  0 14:14 ?        00:00:00 postgres -D /var/PostgresDb
postgres  8428  8418  9 14:14 ?        00:02:30 postgres: logger process  
postgres  8593  8418 28 14:14 ?        00:07:20 postgres: wal sender process dbuser 10.1.4.48(41137) streaming 0/50341D0

Here is the list of postgres processes on the standby node:

ps -ef|grep postgres
postgres 28578     1  0 14:14 ?        00:00:00 postgres -D /var/PostgresDb
postgres 28588 28578  9 14:14 ?        00:02:33 postgres: logger process  
postgres 28593 28578  0 14:14 ?        00:00:00 postgres: startup process   recovering 000000050000000000000005
postgres 28594 28578  0 14:14 ?        00:00:00 postgres: checkpointer process  
postgres 28595 28578  0 14:14 ?        00:00:00 postgres: writer process  
postgres 28596 28578  0 14:14 ?        00:00:00 postgres: stats collector process  
postgres 28597 28578 25 14:14 ?        00:06:50 postgres: wal receiver process  
postgres 28605 28578  0 14:14 ?        00:00:02 postgres: dbuser dbname 10.1.4.48(42893) idle

The logs from pg_log directory on master node are overfilled with the following messages:

57P03 FATAL:  the database system is shutting down
DEBUG:  write 0/50341D0 flush 0/5034208 apply 0/5034208
DEBUG:  sending replication keepalive

The log level for log_min_messages and log_min_error_statement was deliberately set to debug5 in order to collect as more information as possible.

The contents of pg_log directory has been attached from the both nodes.

Could you please clarify this issue? Is it a bug or an incorrect  configuration, usage or anything else?

Thank You in advance,
Andrei