http://speculation.org/garrick/kill-9.html
авторIf the process is still running, then stop sending it signals. It's either stuck in I/O wait or it's Defunct. 'ps auxw | grep processname', if you see it's in state D, then kill its parent process (the 3rd column of 'ps -ef' is the parent pid). If it's in I/O wait, then you have a deeper system problem. Most home users will never have this problem.
Видел такую бяку при порваном SAN`е. После такого даже обычный shutdown не проходит, т.к. ждет завершения этого бессмертного процесса - пришлось ребутить кнопкой