I was trying to add smbuser later delete.
Running samba from source code.
# /usr/local/samba/sbin/smbd -F -S
Logs are coming on console, But sadly none of logs provided me the correct direction on steps I was doing.
Only 1 error code I can see something as:
smbd_smb2_request_error_ex: smbd_smb2_request_error_ex: idx status[NT_STATUS_BUFFER_TOO_SMALL] | +info| at ../source3/smbd/smb2_getinfo.c:171
Rest all logs seems irrelevant/not of use to me.