Linux debug considerations including bios, firewall, security disables for chips, devices, and software components:

# disable the firewall for current runtime
service iptables save
service iptables stop
# disable the firewall for reboots
chkconfig iptables off
# If you are using IPv6 firewa
service ip6tables save
service ip6tables stop
chkconfig ip6tables off

# disable selinux for current runtime
echo 0 >/selinux/enforce
# ensable selinux
echo 1 >/selinux/enforce
#disable selinux for reboots
# edit /etc/selinux/config
SELINUX=enforcing
SELINUX=permissive
SELINUX=disabled
# edit /boot/grub/grub.conf
kernel /boot/vmlinuz-2.4.20-selinux-2003040709 ro root=/dev/hda1 nousb enforcing=0

# trace the system call sequence to problem
strace /tmp/ks-script
Alt-F2 during a boot or kickstart
chroot /mnt/sysimage
service {hung-service} stop
# hopefully the rest of the boot or kickstart %post finishes