It sems like there is no cleanup of dead processes after each run
Example:
...
root 6370 1 0 06:35 ? 00:00:00 [chrome] <defunct>
root 6389 1 0 06:35 ? 00:00:00 [chrome] <defunct>
root 6390 1 0 06:35 ? 00:00:00 [chrome] <defunct>
root 6391 1 0 06:35 ? 00:00:00 [chrome] <defunct>
root 6419 1 0 06:35 ? 00:00:00 [chrome] <defunct>
root 6420 1 0 06:35 ? 00:00:00 [chrome] <defunct>
root 6435 1 0 06:35 ? 00:00:00 [chrome] <defunct>
...