From 9ca700272e01926e71b3e5441b5cad5a68947dbc Mon Sep 17 00:00:00 2001
From: Dominik Christ <d.christ@wikki.co.uk>
Date: Mon, 15 Jul 2013 17:37:21 +0100
Subject: [PATCH] BACKPORT: BUG: particleTracks: limit origProcID to nProcs

---
 .../lagrangian/particleTracks/particleTracks.C             | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/applications/utilities/postProcessing/lagrangian/particleTracks/particleTracks.C b/applications/utilities/postProcessing/lagrangian/particleTracks/particleTracks.C
index 245dcd12e..faa85687e 100644
--- a/applications/utilities/postProcessing/lagrangian/particleTracks/particleTracks.C
+++ b/applications/utilities/postProcessing/lagrangian/particleTracks/particleTracks.C
@@ -80,9 +80,23 @@ int main(int argc, char *argv[])
             label origId = iter().origId();
             label origProc = iter().origProc();
 
+            if (origProc >= maxIds.size())
+            {
+                // Expand size
+                maxIds.setSize(origProc+1, -1);
+            }
+
             maxIds[origProc] = max(maxIds[origProc], origId);
         }
     }
+
+    label maxNProcs = returnReduce(maxIds.size(), maxOp<label>());
+
+    Info<< "Detected particles originating from " << maxNProcs
+        << " processors." << nl << endl;
+
+    maxIds.setSize(maxNProcs, -1);
+
     Pstream::listCombineGather(maxIds, maxEqOp<label>());
     Pstream::listCombineScatter(maxIds);
 
-- 
2.11.4.GIT