Problem:
The following error message shows when loading 2nd kernel with kdump: "irq 169: nobody cared (try booting with the "irqpoll" option)"
 
Solution:
This is just a message. There is no problem with the system's behavior.
You can safely ignore this message.
If you strongly would like to avoid this message, you can proceed with the following operation but IT IS VERY RISKY.

(1) open /etc/sysconfig/kdump with a text editor

(2) modify parameter as follows

    KDUMP_COMMANDLINE_APPEND="irqpoll maxcpus=1 noirqdebug"

Please verify the system if you decide to proceed with this operation.