p2p: fix deadlock banning while updating peer lists

src/p2p/net_node.inl

@@ -2155,6 +2155,7 @@ namespace nodetool
 
     LOG_DEBUG_CC(context, "REMOTE PEERLIST: remote peerlist size=" << peerlist_.size());
     LOG_TRACE_CC(context, "REMOTE PEERLIST: " << ENDL << print_peerlist_to_string(peerlist_));
+    CRITICAL_REGION_LOCAL(m_blocked_hosts_lock);
     return m_network_zones.at(context.m_remote_address.get_zone()).m_peerlist.merge_peerlist(peerlist_, [this](const peerlist_entry &pe) {
       return !is_addr_recently_failed(pe.adr) && is_remote_host_allowed(pe.adr);
     });