Unkillable processes

[LongoMR]

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I have seen several times in the past years, processes which cannot
be killed on UNIX. I have been told that one of two things can be
happening. One, the process is waiting on a non-existant wait channel, or
two, the process is running with a negative priority level. This seems
to happen at random on random processes. Has anyone else seen this and,
if so, how is the problem handled?
	Mark Longo		AT&T ISL Denver