From 5d9f965083158f9fb854024d7fa464171ed4e074 Mon Sep 17 00:00:00 2001
From: Remi Gacogne <remi.gacogne@powerdns.com>
Date: Thu, 21 Jan 2016 11:19:55 +0100
Subject: [PATCH] dnsdist: Lock the response ring in exceedRespGen()

Hopefully this should fix #3277.
---
 pdns/dnsdist-lua2.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pdns/dnsdist-lua2.cc b/pdns/dnsdist-lua2.cc
index 0172032cc2..3c2c06f0dd 100644
--- a/pdns/dnsdist-lua2.cc
+++ b/pdns/dnsdist-lua2.cc
@@ -61,7 +61,8 @@ map<ComboAddress,int> exceedRespGen(int rate, int seconds, std::function<void(co
   clock_gettime(CLOCK_MONOTONIC, &now);
   cutoff = mintime = now;
   cutoff.tv_sec -= seconds;
-  
+
+  std::lock_guard<std::mutex> lock(g_rings.respMutex);
   for(const auto& c : g_rings.respRing) {
     if(seconds && c.when < cutoff)
       continue;
-- 
2.47.2