Not sure if it's the same issue, but my CPU runs at 17-20% most of the time because of Avast.
MacBook Pro, i7 2.8Ghz, mid 2013, FileVault disabled.
When I run the command posted above I get this message:
read(): unexpected end of file
Later edit:
There are a lot of messsages like these in Console:
Feb 19 11:30:52 Lucians-MacBook-Pro.local com.avast.daemon[148]: avldrDuplicateHandle(): Too many open files
Feb 19 11:30:52 Lucians-MacBook-Pro.local com.avast.fileshield[1050]: avscan_handle_read: Lost connection to daemon unexpectedly.