Description of problem:

The /etc/sudoers has the following content:

## RHN specifics ##
Cmnd_Alias INSTALL_RHN = /sbin/service rhn-satellite restart,\
                         /sbin/rhn-sat-restart-silent,\
                         /usr/bin/rhn-config-tnsnames.pl,\
                         /usr/bin/rhn-config-schema.pl,\
                         /usr/bin/rhn-populate-database.pl,\
                         /usr/bin/rhn-install-ssl-cert.pl,\
                         /usr/bin/rhn-deploy-ca-cert.pl,\
                         /usr/bin/rhn-generate-pem.pl,\
                         /usr/bin/satcon-build-dictionary.pl,\
                         /usr/bin/satcon-deploy-tree.pl,\
                         /usr/bin/rhn-config-satellite.pl,\
                         /usr/bin/rhn-satellite-activate,\
                         /usr/bin/satellite-sync,\
                         /usr/bin/rhn-ssl-tool,\
                         /usr/bin/rhn-ssl-dbstore,\
                         /usr/bin/rhn-bootstrap,\
                         /usr/sbin/rhnreg_ks,\
                         /etc/rc.d/np.d/step Monitoring install,\
                         /etc/rc.d/np.d/step MonitoringScout install,\
                         /bin/ln -s /opt/notification/cron/notification /etc/cron.d/notification

Cmnd_Alias CONFIG_RHN = /sbin/service rhn-satellite restart,\
                        /sbin/service Monitoring restart,\
                        /sbin/service MonitoringScout restart,\
                        /sbin/service taskomatic restart,\
                        /usr/bin/satcon-deploy-tree.pl,\
                        /usr/bin/rhn-config-satellite.pl,\
                        /etc/rc.d/np.d/step Monitoring install,\
                        /etc/rc.d/np.d/step MonitoringScout install,\
                        /etc/rc.d/np.d/step Monitoring uninstall,\
                        /etc/rc.d/np.d/step MonitoringScout uninstall,\
                        /bin/ln -s /opt/notification/cron/notification /etc/cron.d/notification,\
                        /bin/rm /etc/cron.d/notification,\
                        /usr/bin/rhn-load-ssl-cert.pl

# The INSTALL_RHN commands are required for RHN Satellite
# installation.  They can be disabled post-install.
apache  ALL=(root)      NOPASSWD: INSTALL_RHN
tomcat  ALL=(root)      NOPASSWD: INSTALL_RHN

# The CONFIG_RHN commands are required for reconfiguration of a
# running RHN Satellite.  They should be enabled for proper operation
# of the RHN Satellite.
apache  ALL=(root)      NOPASSWD: CONFIG_RHN
tomcat  ALL=(root)      NOPASSWD: CONFIG_RHN

# These two directives allow tomcat and apache to invoke CONFIG_RHN
# and INSTALL_RHN commands via sudo even without a real tty
Defaults:tomcat !requiretty
Defaults:apache !requiretty

So I followed the INSTALL_RHN documentation and commented the INSTALL_RHN lines out using visudo:
### apache  ALL=(root)      NOPASSWD: INSTALL_RHN
### tomcat  ALL=(root)      NOPASSWD: INSTALL_RHN

Then I went to https://vmware135.englab.brq.redhat.com/rhn/admin/config/Restart.do
and hit Restart.

The restart did not finish.

Version-Release number of selected component (if applicable):

Spacewalk 0.3.

How reproducible:

Deterministic.

Steps to Reproduce:
1. Comment out the INSTALL_RHN lines in sudoers, try to restart Spacewalk from WebUI.
  
Actual results:

It will not restart.

Expected results:

It should restart.

Additional info:

root     20594  0.0  0.2   5968  1464 ?        S    16:58   0:00 /usr/bin/sudo /sbin/rhn-sat-restart-silent

# strace -p 20594
Process 20594 attached - interrupt to quit
read(0, 0xbf9d14ef, 1)                  = ? ERESTARTSYS (To be restarted)
--- SIGALRM (Alarm clock) @ 0 (0) ---
sigreturn()                             = ? (mask now [QUIT])
alarm(0)                                = 0
write(2, "\n", 1)                       = 1
[...]

If rhn-sat-restart-silent is not permitted in sudoers, it will wait for password on stdin or something.