the postgres process is not killed when the postmaster is killed

Hi,

Start a psql client to connect the postgres. Now we have the postmaster process and the postgres process as below:
postgres 2184 1 0 02:59 ? 00:00:00 /opt/HighGo/db/bin/postgres
postgres 2268 2184 0 04:08 ? 00:00:00 postgres: postgres highgo [local] idle

then run the “kill -9 2184” to kill the postmaster, all of the subprocess are killed except the postgres (PID 2268).

I could reproduce this issue every time.

If the process 2268 is still alive, pg_ctl start and pg_ctl stop will fail.

Is it a bug? What should I configure if I want all of the subprocess are killed?

Thanks
Steven