CVE-2023-53291 rcu/rcuscale: Stop kfree_scale_thread thread(s) after unloading rcuscale

In the Linux kernel, the following vulnerability has been resolved: rcu/rcuscale: Stop kfreescalethread threads after unloading rcuscale Running the 'kfreercutest' test case 1 results in a splat 2. The root cause is the kfreescalethread threads continue running after unloading the rcuscale module...