After rook-ceph clean up, there is leftover process "[ceph-msgr]"

[ygao-armada]

What happened:
I follow instruction on https://rook.io/docs/rook/latest/Storage-Configuration/ceph-teardown/ to clean up the rook-ceph storage

However, on each node, there is a leftover process, which can NOT be terminated by "kill -9":
1 I root 8159 2 0 60 -20 - 0 rescue 05:09 ? 00:00:00 [ceph-msgr]

What you expected to happen:
No leftover from rook-ceph

How to reproduce it (as minimally and precisely as possible):

1. Create the storage following: https://rook.io/docs/rook/latest/Getting-Started/quickstart/
2. Create Block Storage following: https://rook.io/docs/rook/latest/Storage-Configuration/Block-Storage-RBD/block-storage/
3. Clean up following: https://rook.io/docs/rook/latest/Storage-Configuration/ceph-teardown/
4. ssh to each node and run command: "ps -ef | grep ceph"

Anything else we need to know?:

Environment:

• EKS Anywhere Release: v0.18.7
• EKS Distro Release: 1.28.7

[ygao-armada]

File another one: rook/rook#14328 against rook already.