This messge is a bit cryptic:
 * "Unacceptable model uncertainty examining processes"

This commit will show which process causes this issue:
 * "Unacceptable model uncertainty examining process(ganglia  20877     1 20877 17.3  3.2 2230968  0 1077096  3 01:17 01:48:23 /usr/sbin/gmond --pid-file /var/run/gmond.pid): `3 != 1077096  3`"
Merge pull request #1833 from basvandervlies/process_select_improve_verbose_message

improve error message for process_select