sh : queue_delayed_work_on (delayed_work_timer_fn)

[Ben Liblit]

PowerTOP reports that one of the top wakeup causes on my desktop machine is:

     27.0% ( 59.8)  sh : queue_delayed_work_on (delayed_work_timer_fn)

I can use "lsof /bin/sh" to figure out what the live sh processes are. 
During a typical desktop login session I see just two: one for the 
firefox wrapper script and one for the thunderbird wrapper script.  If I 
exit both of those applications, "lsof /bin/sh" lists *zero* processes 
running sh.

And yet ... "sh : queue_delayed_work_on (delayed_work_timer_fn)" still 
appears at the top of PowerTOP's wakeup causes list!

Any ideas what's going on here?  Where are these phantom sh processes 
coming from that disturb my CPU's slumber?