Do not stop a session unless the candidate of a writable connection belongs to the

webrtc/p2p/base/p2ptransportchannel.cc

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 1382 matching lines @@
   if (ice_role_ == ICEROLE_CONTROLLED) {
     if (connection == pending_best_connection_ && connection->writable()) {
       pending_best_connection_ = NULL;
       LOG(LS_INFO) << "Switching best connection on controlled side"
                    << " because it's now writable: " << connection->ToString();
       SwitchBestConnectionTo(connection);
     }
   }
 
   // May stop the allocator session when at least one connection becomes
-  // strongly connected after starting to get ports. It is not enough to check
+  // strongly connected after starting to get ports and the local candidate of
+  // the connection is at the latest generation. It is not enough to check
   // that the connection becomes weakly connected because the connection may be
   // changing from (writable, receiving) to (writable, not receiving).
-  if (!connection->weak()) {
+  bool strongly_connected = !connection->weak();
+  bool latest_generation = connection->local_candidate().generation() >=
+                           allocator_session()->generation();
+  if (strongly_connected && latest_generation) {
     MaybeStopPortAllocatorSessions();
   }
 
   // We have to unroll the stack before doing this because we may be changing
   // the state of connections while sorting.
   RequestSort();
 }
 
 // When a connection is removed, edit it out, and then update our best
 // connection.
@@ skipping 216 matching lines @@
 
   // During the initial state when nothing has been pinged yet, return the first
   // one in the ordered |connections_|.
   return *(std::find_if(connections_.begin(), connections_.end(),
                         [conn1, conn2](Connection* conn) {
                           return conn == conn1 || conn == conn2;
                         }));
 }
 
 }  // namespace cricket