NSF_ZONE_SHUTDOWN
nts->nts_flags |= NSF_ZONE_SHUTDOWN;
nts->nts_flags &= ~NSF_ZONE_SHUTDOWN;
if ((nts->nts_flags & NSF_ZONE_SHUTDOWN) ||
ns->netstack_flags |= NSF_ZONE_SHUTDOWN;
ASSERT(ns->netstack_flags & NSF_ZONE_SHUTDOWN);
ns->netstack_flags &= ~NSF_ZONE_SHUTDOWN;
(NSF_ZONE_CREATE|NSF_ZONE_SHUTDOWN|NSF_ZONE_DESTROY)