crontab jobs not running

[David D]

Our Oracle environment is running on a cluster of redhat boxes.  Each
node is running Redhat 5, x86_64. We are having a problem with our
crontab tasks.  No job seems to be running.  Even root’s crontab jobs
fail to execute.  When I look at /var/log/cron the following lines are
listed over and over:

     Jul 16 13:01:01 server1 crond[1632]: Bad item passed to pam_*_item()
     Jul 16 13:01:01 server1 crond[1632]: CRON (root) ERROR: failed to
open PAM security session: Success
     Jul 16 13:01:01 server1 crond[1632]: CRON (root) ERROR: cannot
set security context

I can’t seem to isolate this issue.   Some other interesting points
that may be related:

*  SE Linux is disabled
*  No cron.allow file exists.
*  The cron.deny file is empty
*  The installed cron packages are:

     anacron.x86_64                            2.3-45.0.1.el5
     crontabs.noarch                           1.10-8
     vixie-cron.x86_64                         4:4.1-77.el5_4.1

*  The installed pam packages are:

     pam.i386                                  0.99.6.2-6.el5_5.2
     installed
     pam.x86_64                                0.99.6.2-6.el5_5.2
     installed
     pam_ccreds.i386                           3-5
     installed
     pam_ccreds.x86_64                         3-5
     installed
     pam_krb5.i386                             2.2.14-18.el5
     installed
     pam_krb5.x86_64                           2.2.14-18.el5
     installed
     pam_passwdqc.i386                         1.0.2-1.2.2
     installed
     pam_passwdqc.x86_64                       1.0.2-1.2.2
     installed
     pam_pkcs11.i386                           0.5.3-23
     installed
     pam_pkcs11.x86_64                         0.5.3-23
     installed
     pam_smb.i386                              1.1.7-7.2.1
     installed
     pam_smb.x86_64                            1.1.7-7.2.1
     installed

*  The contents of /etc/pam.d/cron is:
     #
     # The PAM configuration file for the cron daemon
     #
     #

     auth       sufficient pam_env.so
    auth       required   pam_rootok.so
    auth       include    system-auth
    account    required   pam_access.so
    account    include    system-auth
    session    required   pam_loginuid.so
    session    include    system-auth
    /etc/pam.d/crond (END)

*  Around the time cron stopped working the following entries started
appearing in /var/log/secure:
     Jul  6 20:40:01 dbtc01 crond[15916]: pam_env(crond:setcred):
pam_putenv: delete non-existent entry; . $AW_HOME/site/sosite
     Jul  6 20:40:01 dbtc01 crond[15916]: pam_env(crond:setcred):
pam_putenv: delete non-existent entry; . $AW_HOME/site/sosite

Any insight is appreciated!  Thank you for your assistance.

David