Reg: connection is getting closed when doing select count(*)

[Raj kumar <rajkumar820999@xxxxxxxxx>]

I have installed Postgres12 in my Macbook. I have loaded data into the database using pgbench. When I try to execute the command below, I am not getting the output. Instead, connection is getting closed. Command and errors are written below.

More Information:

I am the only one using the database with default parameters in postgresql.conf.

Command:

(base) FVFZF06NNY1J:data rkuma803$ psql -U rkuma803 -d postgres
psql (12.2)
Type "help" for help.

postgres=# \c pgbench
You are now connected to database "pgbench" as user "rkuma803".
pgbench=# select count(*) from pgbench_accounts;                                                                       server closed the connection unexpectedly
This probably means the server terminated abnormally
before or while processing the request.
The connection to the server was lost. Attempting reset: Failed.
!>
!> ^D\q
(base)

Error from DB logs,

2020-03-03 14:59:20.868 IST [51374] STATEMENT:  select count(*) from pgbench_accounts;
2020-03-03 14:59:25.852 IST [51363] LOG:  server process (PID 51386) was terminated by signal 9: Killed: 9
2020-03-03 14:59:25.852 IST [51363] DETAIL:  Failed process was running: select count(*) from pgbench_accounts;
2020-03-03 14:59:25.852 IST [51363] LOG:  terminating any other active server processes
2020-03-03 14:59:25.854 IST [51369] WARNING:  terminating connection because of crash of another server process
2020-03-03 14:59:25.854 IST [51369] DETAIL:  The postmaster has commanded this server process to roll back the current transaction and exit, because another server process exited abnormally and possibly corrupted shared memory.
2020-03-03 14:59:25.854 IST [51369] HINT:  In a moment you should be able to reconnect to the database and repeat your command.