I'm using backtrack5 R2 and sometimes when I log in the information showed says that
There is 1 zombie process, where can I see what process is running?
ps command to watch currently running processes.
ps aux will give more verbose output. If the value in STATE column equal to Z, then you know it is a zombie process.
I don't think that zombie proccesses are included in bootstrap sequence on purpose. It's rather a shatter from another process. Maybe via
ps command you will be able to figure out what it was exactly.