I m facing some issue while doing dynamic debug with rbd kernel

steps:

1. sudo cat /boot/config-`uname -r` | grep DYNAMIC_DEBUG

CONFIG_DYNAMIC_DEBUG=y

2.sudo mount -t debugfs none /sys/kernel/debug

3.sudo echo 9 > /proc/sysrq-trigger

4.sudo echo 'module rbd +p' | sudo tee -a /sys/kernel/debug/dynamic_debug/control

in the last step I am getting error

`tee: /sys/kernel/debug/dynamic_debug/control: Invalid argument`

Can anyone tell me how to resolve this?

Thank You.