- fixes a "collection out of sync" exception in the ODE physics

engine, caused by an "avatar infinite position" occurring under
  heavy load.
- fixes "value too small" exception in ChatModule

OpenSim/Region/CoreModules/Avatar/Chat/ChatModule.cs

@@ -294,8 +294,8 @@ namespace OpenSim.Region.CoreModules.Avatar.Chat
                 new Vector3(presence.Scene.RegionInfo.RegionLocX * Constants.RegionSize,
                             presence.Scene.RegionInfo.RegionLocY * Constants.RegionSize, 0);
 
-            int dis = Math.Abs((int) Util.GetDistanceTo(toRegionPos, fromRegionPos));
+            int dis = (int)Util.GetDistanceTo(toRegionPos, fromRegionPos);
-
+            
             if (type == ChatTypeEnum.Whisper && dis > m_whisperdistance ||
                 type == ChatTypeEnum.Say && dis > m_saydistance ||
                 type == ChatTypeEnum.Shout && dis > m_shoutdistance)

OpenSim/Region/Physics/OdePlugin/ODECharacter.cs

@@ -26,6 +26,7 @@
  */
 
 using System;
+using System.Collections.Generic;
 using System.Reflection;
 using OpenMetaverse;
 using Ode.NET;
@@ -785,7 +786,7 @@ namespace OpenSim.Region.Physics.OdePlugin
         /// This is the avatar's movement control + PID Controller
         /// </summary>
         /// <param name="timeStep"></param>
-        public void Move(float timeStep)
+        public void Move(float timeStep, List<OdeCharacter> defects)
         {
             //  no lock; for now it's only called from within Simulate()
 
@@ -803,11 +804,14 @@ namespace OpenSim.Region.Physics.OdePlugin
 
             d.Vector3 localpos = d.BodyGetPosition(Body);
             PhysicsVector localPos = new PhysicsVector(localpos.X, localpos.Y, localpos.Z);
+            
             if (!PhysicsVector.isFinite(localPos))
             {
 
                 m_log.Warn("[PHYSICS]: Avatar Position is non-finite!");
-                _parent_scene.RemoveCharacter(this);
+                defects.Add(this);
+                // _parent_scene.RemoveCharacter(this);
+
                 // destroy avatar capsule and related ODE data
                 if (Amotor != IntPtr.Zero)
                 {
@@ -815,6 +819,7 @@ namespace OpenSim.Region.Physics.OdePlugin
                     d.JointDestroy(Amotor);
                     Amotor = IntPtr.Zero;
                 }
+
                 //kill the Geometry
                 _parent_scene.waitForSpaceUnlock(_parent_scene.space);
 
@@ -958,7 +963,8 @@ namespace OpenSim.Region.Physics.OdePlugin
             {
                 m_log.Warn("[PHYSICS]: Got a NaN force vector in Move()");
                 m_log.Warn("[PHYSICS]: Avatar Position is non-finite!");
-                _parent_scene.RemoveCharacter(this);
+                defects.Add(this);
+                // _parent_scene.RemoveCharacter(this);
                 // destroy avatar capsule and related ODE data
                 if (Amotor != IntPtr.Zero)
                 {

OpenSim/Region/Physics/OdePlugin/OdePlugin.cs

@@ -1434,42 +1434,45 @@ namespace OpenSim.Region.Physics.OdePlugin
         {
             _perloopContact.Clear();
 
-            foreach (OdeCharacter chr in _characters)
+            lock (_characters)
             {
-                // Reset the collision values to false
+                foreach (OdeCharacter chr in _characters)
-                // since we don't know if we're colliding yet
-
-                // For some reason this can happen. Don't ask...
-                //
-                if (chr == null)
-                    continue;
-
-                if (chr.Shell == IntPtr.Zero || chr.Body == IntPtr.Zero)
-                    continue;
-
-                chr.IsColliding = false;
-                chr.CollidingGround = false;
-                chr.CollidingObj = false;
-
-                // test the avatar's geometry for collision with the space
-                // This will return near and the space that they are the closest to
-                // And we'll run this again against the avatar and the space segment
-                // This will return with a bunch of possible objects in the space segment
-                // and we'll run it again on all of them.
-                try
                 {
-                    d.SpaceCollide2(space, chr.Shell, IntPtr.Zero, nearCallback);
+                    // Reset the collision values to false
-                }
+                    // since we don't know if we're colliding yet
-                catch (AccessViolationException)
+                    
-                {
+                    // For some reason this can happen. Don't ask...
-                    m_log.Warn("[PHYSICS]: Unable to space collide");
+                    //
-                }
+                    if (chr == null)
-                //float terrainheight = GetTerrainHeightAtXY(chr.Position.X, chr.Position.Y);
+                        continue;
-                //if (chr.Position.Z + (chr.Velocity.Z * timeStep) < terrainheight + 10)
+                    
-                //{
+                    if (chr.Shell == IntPtr.Zero || chr.Body == IntPtr.Zero)
+                        continue;
+                    
+                    chr.IsColliding = false;
+                    chr.CollidingGround = false;
+                    chr.CollidingObj = false;
+                    
+                    // test the avatar's geometry for collision with the space
+                    // This will return near and the space that they are the closest to
+                    // And we'll run this again against the avatar and the space segment
+                    // This will return with a bunch of possible objects in the space segment
+                    // and we'll run it again on all of them.
+                    try
+                    {
+                        d.SpaceCollide2(space, chr.Shell, IntPtr.Zero, nearCallback);
+                    }
+                    catch (AccessViolationException)
+                    {
+                        m_log.Warn("[PHYSICS]: Unable to space collide");
+                    }
+                    //float terrainheight = GetTerrainHeightAtXY(chr.Position.X, chr.Position.Y);
+                    //if (chr.Position.Z + (chr.Velocity.Z * timeStep) < terrainheight + 10)
+                    //{
                     //chr.Position.Z = terrainheight + 10.0f;
                     //forcedZ = true;
-                //}
+                    //}
+                }
             }
 
             lock (_activeprims)
@@ -2799,10 +2802,18 @@ namespace OpenSim.Region.Physics.OdePlugin
                                 // Move characters
                                 lock (_characters)
                                 {
+                                    List<OdeCharacter> defects = new List<OdeCharacter>();
                                     foreach (OdeCharacter actor in _characters)
                                     {
                                         if (actor != null)
-                                            actor.Move(timeStep);
+                                            actor.Move(timeStep, defects);
+                                    }
+                                    if (0 != defects.Count)
+                                    {
+                                        foreach (OdeCharacter defect in defects)
+                                        {
+                                            RemoveCharacter(defect);
+                                        }
                                     }
                                 }