[openib-general] crash in ib_sa_mcmember_rec_callback while probing out ib_sa

[Roland Dreier]

Looks like the same crash mst saw related to the multicast module
being unloaded and then having sa call back into it.  One small clue:

 > esi: f38a5bec   edi: f38a5bf4   ebp: fffffffc   esp: f599be60

ebp is -4, which is -EINTR.  So this may be a callback from sa_query's
send_handler() caused by a IB_WC_WR_FLUSH_ERR status.

 - R.