kdump second kernel boot failed on iSCSI and ibft environment due to ip duplication

Issue

The kdump second kernel does not boot in iSCSI and iBFT environment.
In a serial console during booting the second kernel, the following error can be seen.

# echo c > /proc/sysrq-trigger 
[   95.659410] SysRq : Trigger a crash
[   95.661346] BUG: unable to handle kernel NULL pointer dereference at           (null)
...
[    0.506736] mce: Unable to init device /dev/mcelog (rc: -5)
[    0.663684] dracut: FATAL: For argument 'ip=ibft0:dhcp'\nDuplication configurations for 'ibft0'   <<<--- HERE
[    0.664813] dracut: Refusing to continue
[    0.969591] do_IRQ: 0.225 No irq handler for vector (irq -1)
[    1.342992] System halted.