From 1c4f2e1bd44482c2ef38012a76a255eee130cd03 Mon Sep 17 00:00:00 2001
From: Remi Gacogne <remi.gacogne@powerdns.com>
Date: Wed, 8 Nov 2017 12:23:12 +0100
Subject: [PATCH] rec: Don't crash when asked to run with zero threads

---
 pdns/pdns_recursor.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pdns/pdns_recursor.cc b/pdns/pdns_recursor.cc
index e987037e0..324c51468 100644
--- a/pdns/pdns_recursor.cc
+++ b/pdns/pdns_recursor.cc
@@ -2986,6 +2986,11 @@ static int serviceMain(int argc, char*argv[])
   g_lowercaseOutgoing = ::arg().mustDo("lowercase-outgoing");
 
   g_numWorkerThreads = ::arg().asNum("threads");
+  if (g_numWorkerThreads < 1) {
+    L<<Logger::Warning<<"Asked to run with 0 threads, raising to 1 instead"<<endl;
+    g_numWorkerThreads = 1;
+  }
+
   g_numThreads = g_numWorkerThreads + g_weDistributeQueries;
   g_maxMThreads = ::arg().asNum("max-mthreads");
 
-- 
2.40.0