From 2659c407c4636ba92db9917ab1d8146cc2536707 Mon Sep 17 00:00:00 2001
From: Joost VandeVondele <Joost.VandeVondele@gmail.com>
Date: Sun, 2 Dec 2018 20:22:18 +0100
Subject: [PATCH] Fix segfault.

the wrong data type was passed to an MPI call, leading to occasional segfaults. This patch fixes this.

No functional change.
---
 src/cluster.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/cluster.cpp b/src/cluster.cpp
index c6290a27..6900844a 100644
--- a/src/cluster.cpp
+++ b/src/cluster.cpp
@@ -127,7 +127,7 @@ bool getline(std::istream& input, std::string& str) {
 
   // Some MPI implementations use busy-wait pooling, while we need yielding
   static MPI_Request reqInput = MPI_REQUEST_NULL;
-  MPI_Ibcast(&size, 1, MPI_UNSIGNED_LONG, 0, InputComm, &reqInput);
+  MPI_Ibcast(&size, 1, MPI_INT, 0, InputComm, &reqInput);
   if (is_root())
       MPI_Wait(&reqInput, MPI_STATUS_IGNORE);
   else {