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https://github.com/dracutdevs/dracut/pull/650/commits/f1d886adcdb86783677592bc93ee2e81711c362e

In short, we have a bug in our dhclient script, where we wait until duplicate address detection is done for the link-local address. The check does not cover the case when the link-local address was not yet calculated by the kernel and in such case, we immediately start the dhclient which fails.

I was able to reproduce this pretty reliably in libvirt, all I had to do was to have ipv6-only network and boot with "ip=dhcp6 rd.neednet=1 rd.break", then you can see that there is no ipv6 address from DHCP.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:1139