What steps will reproduce the problem?
1. start sflow2graphite under supervisord
2. stop sflow2graphite via supervisorctl
3. attempt to restart sflow2graphite via supervisorctl.  Start up fails because 
"sflowtool" is still running.

What is the expected output? What do you see instead?

I expect sflow2graphite to start cleanly.  However, when it died it left a 
running instance of sflowtool and so it cannot restart.

What version of the product are you using? On what operating system?

Jan 12 update on Debian Etch.

Please provide any additional information below.

sflowtool appears to exit correctly when receiving ^C from the command line.