lgoldstein commented on a change in pull request #123:
URL: https://github.com/apache/mina-sshd/pull/123#discussion_r412178637



##########
File path: 
sshd-core/src/main/java/org/apache/sshd/common/session/helpers/AbstractSession.java
##########
@@ -954,7 +954,9 @@ protected IoWriteFuture doWritePacket(Buffer buffer) throws 
IOException {
         synchronized (encodeLock) {
             Buffer packet = resolveOutputPacket(buffer);
             IoSession networkSession = getIoSession();
-            return networkSession.writePacket(packet);
+            IoWriteFuture future = networkSession.writePacket(packet);
+            buffer.rpos(buffer.wpos());
+            return future;

Review comment:
       >>  So while the packet is yet to be written, the buffer won't be used 
anymore and is consumed at the time the buffer.rpos(buffer.wpos()) is called.
   
   That was not what I meant - `networkSession#writePacket` might be 
asynchronous - i.e., posts the buffer for writing and returns immediately - so 
when it attempt to access `rpos` it might use the wrong one since we override 
it.




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