Worker process is not getting killed , when master is killed using -9

[Vivek Goel]

Hi,
I am facing one problem with nginx.  I am waiting for nginx to stop withing
30 seconds. If it is not getting stopped, I am firing command to kill
master process using
pkill -9 <master_process_pid>

But, Killing master is not killing the worker process. Due to that reason.
Port is not getting released.

Is it known problem  or desired behavior ?

regards
Vivek Goel
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