I confirm I'm able to reproduce this bug in Raring using the
instructions in the bug description.  The problem is upstream commit:

dc7b3eb ipvs: Fix reuse connection if real server is dead

It causes a NULL pointer here:
   1658         if (unlikely(sysctl_expire_nodest_conn(ipvs)) && cp && cp->dest 
&&
   1659             unlikely(!atomic_read(&cp->dest->weight)) && !iph.fragoffs 
&&
   1660             is_new_conn(skb, &iph)) {
   1661                 ip_vs_conn_expire_now(cp);
   1662                 __ip_vs_conn_put(cp);
   1663                 cp = NULL;
   1664         }
when accessing the ipvs variable.  In mainline kernel, this variable is 
initialised; in the 3.8 kernel it is not.  I'll post a test kernel with a fix 
for testing.  Another option is to revert the above commit.

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https://bugs.launchpad.net/bugs/1238494

Title:
  Kernel panic on 3.8.0-29 when using ipvs

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