[RHEL6/5] Why does sosreport throw message "one or more processes are in state D"?

Issue

• Following messages found during executing sosreport(which is included in sos-2.2-/sos-1.7-), why ? ( sosreport in sos-3.2 or later does not show this messages)

  sosreport (version 2.2)

 # sosreport  --diagnose

sosreport (version 1.7)

 # sosreport

    This utility will collect some detailed  information about the
    hardware and  setup of your  Red Hat Enterprise Linux  system.
    The information is collected and an archive is  packaged under
    /tmp, which you can send to a support representative.
    Red Hat will use this information for diagnostic purposes ONLY
    and it will be considered confidential information.

    This process may take a while to complete.
    No changes will be made to your system.

    Press ENTER to continue, or CTRL-C to quit.
    One or more plugins have detected a problem in your configuration.
    Please review the following messages:

    process:
        * one or more processes are in state `D` (sosreport might hang)