ORA-15097: cannot SHUTDOWN ASM instance with connected client (process 2476)

Symptoms
Following error is reported while trying to shutdown ASM:
ORA-15097: cannot SHUTDOWN ASM instance with connected client

srvctl stop asm -n enode1 -f
PRCR-1014 : Failed to stop resource ora.asm
PRCR-1065 : Failed to stop resource ora.asm
CRS-2673: Attempting to stop 'ora.asm' on 'enode1'
ORA-15097: cannot SHUTDOWN ASM instance with connected client
CRS-2675: Stop of 'ora.asm' on 'enode1' failed
CRS-2675: Stop of 'ora.asm' on 'enode1' failed

Verified there is no instance up and running on local node except ASM itself:

ps -ef|grep pmon
oracle    3913     1  0 22:45 ?        00:00:00 asm_pmon_+ASM1

Cause
The OCR is located on ASM and CRSD is client of ASM thus ASM can't be shutdown

Solution
To shutdown ASM, CRS need to be shutdown: crsctl stop crs  --root用户
ATTENTION: Never kill the ASM instance!(这样CRS 也会被挂掉。)