Drop the CopyTo parameter from Int32.MaxValue to 4096. This is a buffer size

not a target size. Mono 2.10 appears to try to allocate the full buffer which
immediately crashes. Tested on mono 2.6.7 and 2.10.5

OpenSim/Services/Connectors/SimianGrid/SimianAssetServiceConnector.cs

@@ -473,7 +473,7 @@ namespace OpenSim.Services.Connectors.SimianGrid
                         // Grab the asset data from the response stream
                         using (MemoryStream stream = new MemoryStream())
                         {
-                            responseStream.CopyTo(stream, Int32.MaxValue);
+                            responseStream.CopyTo(stream, 4096);
                             asset.Data = stream.ToArray();
                         }
                     }