Linux – Bash process with 100% cpu usage. How to troubleshoot

The process has already been reparented to init, so it should be being reaped (otherwise, the solution would likely be to kill its parent). It appears to be stuck in exit, based on the WCHAN field.

It may actually be doing something (like creating a core dump) that will finish and it will go away on its own. Unfortunately, it's likely spinning in the kernel because of a broken driver and ultimately, your only option will be to reboot.