PROBLEM: IP Virtual Server for IPv6 broken Kernel version 3.6.11+

[David Peall]

[1.] One line summary of the problem:    

IP Virtual Server has stopped working with IPv6 virtual services since kernel version 3.6.11.

[2.] Full description of the problem/report:

After upgrading a server I use as a load balancer none of my ipv6 services load anymore.  I suspected the problem was the upgrade of keepalived from 1.2.2 to 1.2.7 but after compiling 1.2.12 form source it still didn’t work.  I then looked at the IP Virtual Server and tried a number of kernels and eventual tracked down where it broke

http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.6.11-raring/ seems to be where it broke

Working:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.2.56-precise/ - works
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.3.8-quantal/ - works
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.4.85-quantal/ - works
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.5.7.32-quantal/ - works
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.6-quantal/ - works
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.6.3-quantal/ - works
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.6.4-raring/ - works
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.6.5-raring/ - works
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.6.8-raring/ - works
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.6.10-raring/ - works

Broken:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.6.11-raring/ - broken
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.13.8-trusty/ - broken
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.14-trusty/ - broken

I get the following message when trying to list a virtual service:
ipvsadm -L -t [2001:xxxx:xxxx::xxx]:xxx
Resource temporarily unavailable

I initially though the problem was with keepalived and reported it here:
https://bugs.launchpad.net/ubuntu/+source/keepalived/+bug/1300739

[3.] Keywords (i.e., modules, networking, kernel):

kernel, ipv6, ipvs

[4.] Kernel version (from /proc/version):

Linux version 3.6.11-030611-generic (root@gomeisa) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) ) #201212171335 SMP Mon Dec 17 18:36:00 UTC 2012

[5.] Output of Oops.. message (if applicable) with symbolic information 
     resolved (see Documentation/oops-tracing.txt)

N/A

[6.] A small shell script or example program which triggers the
     problem (if possible)
[7.] Environment
[7.1.] Software (add the output of the ver_linux script here)

Ubuntu server 14.04

[7.2.] Processor information (from /proc/cpuinfo):

Virtual (KVM)

[7.3.] Module information (from /proc/modules):
[7.4.] Loaded driver and hardware information (/proc/ioports, /proc/iomem)
[7.5.] PCI information ('lspci -vvv' as root)
[7.6.] SCSI information (from /proc/scsi/scsi)
[7.7.] Other information that might be relevant to the problem
       (please look in /proc and include all information that you
       think to be relevant):

cat /proc/net/ip_vs
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port Forward Weight ActiveConn InActConn

On kernel versions before 3.6.11 i get the following:
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  [2001:xxx:xxx::xxx]:xxxx lc persistent 1
  -> [2001:xxx:xxx::x:xxx]:xxxx   Route   1      0          0  

[X.] Other notes, patches, fixes, workarounds:

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