[openib-general] IPv6oIB neighbour discover broken when MCGs overflow

[Roland Dreier]

 > For the successful join, ND sends to the node directly, for the failure
 > join, ND sends to all hosts addr. So ND will work no matter whether the
 > join OK or not, that's the patch does.

But what if the full-member join fails on node A for node A's
solicited node group, but then node B succeeds in joining that group
as a send-only member (perhaps because some other nodes have dropped
off the fabric in the meantime).  Then node B will send the ND message
on a MCG that A is not a member of.

 - R.