Time Machine Backup causes Macbook Pro to hang
The problem was my Time Machine backup. Here are the symptoms I got in their order:


Time Machine get stuck during the backup stage, gives the error "ComputerX.sparsebundle is already in use"
Process fseventsd started hogging CPU causing the computer to slow down
Computer could not restart or shut down


My sparsebundle on the Time Machine was corrupted so my computer could not complete the backup. The process responsible for maintaining the backup (fseventsd) got hung up on the currupted file and started chewing up CPU. When I tried to shutdown my computer, It would get stuck because my computer wouldn't be able to eject the corrupted sparsebundle.

I found the solution here:


https://discussions.apple.com/thread/1502226?start=0&amp;tstart=0


In short, heres how to fix it:

1) mount your sparse bundle from your storage device
 2) do a disk repair from Disk Utility, make sure your sparse bundle is selected!


  Note: If your sparse bundle is not completely corrupted, you might be able to save some of your backups depending on how corrupted the bundle is


3) If your bundle is completely toast (like mine was) then you have to completely erase the bundle and start over from scratch. You DO NOT have to erase the entire backup disk, just your bundle 


  Note: You may have to restart your computer to clear your bundle because now that the corrupted bundle is mounted, your computer won't be able to gracefully unmount.