Why many triton_python_b and tritonserver processes are left after I killed the tritonserver process

[zochaoq]

I am following the readme https://github.com/triton-inference-server/tensorrtllm_backend and use pkill tritonserver to stop it. Sometimes I find I also need to do the same to pkill -9 -f triton_python_backend_stub but in general they do not block me from running the server again.

But I noticed that after above there are many triton_python_b and tritonserver processes left behind like the below. Curious what are these processes and what are the proper ways to terminate those too?

ps aux | grep triton
root        2185  0.0  0.0      0     0 ?        Z    Jul18   1:01 [tritonserver] <defunct>
root        2186  0.1  0.0      0     0 ?        Z    Jul18   1:28 [tritonserver] <defunct>
root        2187  0.1  0.0      0     0 ?        Z    Jul18   1:28 [tritonserver] <defunct>
root        2188  0.1  0.0      0     0 ?        Z    Jul18   1:29 [tritonserver] <defunct>
root        3766  0.0  0.0      0     0 ?        Z    Jul18   0:21 [triton_python_b] <defunct>
root        3825  0.0  0.0      0     0 ?        Z    Jul18   0:24 [triton_python_b] <defunct>
root        4151  0.0  0.0      0     0 ?        Z    Jul18   0:24 [triton_python_b] <defunct>
root        4162  0.0  0.0      0     0 ?        Z    Jul18   0:24 [triton_python_b] <defunct>
...