Rogue processes can cripple the performance of a UNIX machine. In the main they are orphans who, (to retain the familial imagery) after losing their parent, are adopted by their grandparents and are lavished with attention. This attention can come in the form of all spare CPU resource (init being the doting grandparent), causing neighbor processes and applications to complain bitterly. They're easy to spot, but not always easy to prevent. One surefire method of preventing rogues caused by unexpected process termination is to use a trap, for example:

trap "exit" 1 2 15

This example will force a Ctrl-D whenever the program (or environment if the trap is in .profile) experiences a comms hangup, interrupt (e.g. Del) or software termination (default kill). Check your signals list for more codes.