Cloned VM generate same IPv6 link local addresses as the original VM

Issue

If some VM is cloned, the MAC address of it's NIC is generated to be unique by the hypervisor,

but the link-local IPv6 address is the same for the clone VM as well as for the original VM.

Such address is then marked as dead-failed and another one is generated.

Original VM

ens192: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000

link/ether 00:50:56:be:bd:4b brd ff:ff:ff:ff:ff:ff promiscuity 0 addrgenmode none numtxqueues 1 numrxqueues 1 gso_max_size 65536 gso_max_segs 65535 

 inet6 fe80::2985:3be0:6417:91b5/64 scope link noprefixroute valid_lft forever preferred_lft forever

Cloned VM #1

ens192: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000

link/ether 00:50:56:be:58:6b brd ff:ff:ff:ff:ff:ff promiscuity 0 addrgenmode none numtxqueues 1 numrxqueues 1 gso_max_size 65536 gso_max_segs 65535 

inet6 fe80::2985:3be0:6417:91b5/64 scope link tentative noprefixroute dadfailed  valid_lft forever preferred_lft forever
inet6 fe80::230b:b09e:b641:4f62/64 scope link noprefixroute  valid_lft forever preferred_lft forever

Cloned VM #2

ens192: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000

link/ether 00:50:56:be:11:b8 brd ff:ff:ff:ff:ff:ff promiscuity 0 addrgenmode none numtxqueues 1 numrxqueues 1 gso_max_size 65536 gso_max_segs 65535

inet6 fe80::2985:3be0:6417:91b5/64 scope link tentative noprefixroute dadfailed valid_lft forever preferred_lft forever
inet6 fe80::230b:b09e:b641:4f62/64 scope link tentative noprefixroute dadfailed valid_lft forever preferred_lft forever
inet6 fe80::1546:1c0e:cc7d:928d/64 scope link noprefixroute valid_lft forever preferred_lft forever

Clone VM #3

ens192: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000

link/ether 00:50:56:be:b4:b7 brd ff:ff:ff:ff:ff:ff promiscuity 0 addrgenmode none numtxqueues 1 numrxqueues 1 gso_max_size 65536 gso_max_segs 65535

inet6 fe80::2985:3be0:6417:91b5/64 scope link tentative noprefixroute dadfailed valid_lft forever preferred_lft forever
inet6 fe80::230b:b09e:b641:4f62/64 scope link tentative noprefixroute dadfailed valid_lft forever preferred_lft forever
inet6 fe80::1546:1c0e:cc7d:928d/64 scope link tentative noprefixroute dadfailed  valid_lft forever preferred_lft forever

So as can be seen all the VMs are generating the same IPv6 link-local addresses rows.

The Clone VM #3 does not have any functional IPv6 link-local address.