Can't kill a umount

[Gordon Messmer]

On 09/06/2015 01:35 PM, Cameron Simpson wrote:
> I'm actually astounded that unout will spin out unless in-kernel work 
> is being counted to the CPU time (not normally the case). Yes, the 
> drive appears to be buggy, but that should be concealed inside the kernel.

User CPU time and system CPU time are accounted separately, but top will 
normally show the sum of the two.