Why "kernel: eth0: IPv6 duplicate address detected" message displyed in logs ?

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Issue

Following messages getting generated in /var/log/messages.

kernel: eth0: IPv6 duplicate address 2a00:ef8:edda:1:1260:4bff:fe99:a650 detected!
kernel: eth0: IPv6 duplicate address 2a00:ef8:edda:1:1260:4bff:fe99:a650 detected!

Environment

Red Hat Enterprise Linux 6

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