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This bug has been copied from bug #846013 and has been proposed
to be backported to 6.4 z-stream (EUS).

In POST:
http://post-office.corp.redhat.com/archives/rhvirt-patches/2013-April/msg00189.html

I can reproduce this with the steps in Bug 846013, and with pkg: libvirt-0.10.2-18.el6_4.4.x86_64 the problem is solved.

Steps:

1, add ipv6 address in 2 hosts: 3ffe::100 3ffe:101
   prepare /etc/hosts
3ffe::101	zhpeng.example.com
3ffe::100	pengzhimoutest.example.com


2, mount nfs with ipv6 address.
[3ffe::100]:/virt     50396160  37366784  10469376  79% /var/lib/libvirt/images

3, virsh # migrate aaa qemu+tcp://zhpeng.example.com/system tcp:[3ffe::101]

4, after migration, the guest works fine.

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.

http://rhn.redhat.com/errata/RHBA-2013-0756.html