[ 
https://issues.apache.org/jira/browse/QPID-8526?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17346166#comment-17346166
 ] 

Alex Rudyy commented on QPID-8526:
----------------------------------

Hi [~daniel.kirilyuk],

As per provided WARN logs the {{SSLEngine}} was closed (_status: [ Status = 
CLOSED...) on invoking {{shutdownFinalWrite}} before closing the connection 
socket:
{noformat}
_status: [ Status = CLOSED, HandshakeStatus = NOT_HANDSHAKING, bytesConsumed = 
0, bytesProduced = 0 ], _sslEngine.isOutboundDone(): true, 
_sslEngine.isInboundDone(): true, _sslEngine.getPeerHost(): null, 
_sslEngine.getPeerPort(): -1, buffers.size(): 2, _encryptedOutput.size(): 0, 
_netOutputBuffer.remaining(): 152185, 
_sslEngine.getSession().getPacketBufferSize(): 16709, 
_sslEngine.getSession().getCreationTime(): 1620621054549, 
_sslEngine.getSession().getLastAccessedTime(): 1620621054549, 
_sslEngine.getHandshakeSession().isValid(): null handshake session
{noformat}

As result, the connection could not flush final bytes and entered a loop. That 
indicate about a defect in the connection close functionality. I am not sure 
how the {{SSLEngine}} got in that state.
I think we need to understand what happened when the following message got 
logged:
{noformat}
[con:9,435,937(VTVTV_YYYYXXXXXZZZSSS@/127.0.0.1:52648/default)]  : Connection 
closed with error : amqp:resource-limit-exceeded - local-idle-timeout expired
{noformat}

Could you please expand on how the connection got marked as closed for the 
above log?

Potentially, the write loop can be broken by adding the following change:
{code}
$ git diff 
broker-core/src/main/java/org/apache/qpid/server/transport/NonBlockingConnectionTLSDelegate.java
diff --git 
a/broker-core/src/main/java/org/apache/qpid/server/transport/NonBlockingConnectionTLSDelegate.java
 
b/broker-core/src/main/java/org/apache/qpid/server/transport/NonBlockingConnectionTLSDelegate.java
index f6bdabc071..2d2b800a8a 100644
--- 
a/broker-core/src/main/java/org/apache/qpid/server/transport/NonBlockingConnectionTLSDelegate.java
+++ 
b/broker-core/src/main/java/org/apache/qpid/server/transport/NonBlockingConnectionTLSDelegate.java
@@ -253,6 +253,12 @@ public class NonBlockingConnectionTLSDelegate implements 
NonBlockingConnectionDe
                 }
 
                 _status = QpidByteBuffer.encryptSSL(_sslEngine, buffers, 
_netOutputBuffer);
+                if (_status.getStatus() == SSLEngineResult.Status.CLOSED)
+                {
+                    throw new SSLException(String.format("SSLEngine.wrap 
operation could not be completed because"
+                                                         + " it was already 
closed (status %s, handshake status %s)",
+                                                         _status.getStatus(), 
_status.getHandshakeStatus()));
+                }
                 // QPID-8489: workaround for JDK 8 bug to avoid tight looping 
for half closed connections
                 // Additional info: 
https://bugs.openjdk.java.net/browse/JDK-8240071,
                 // 
http://mail.openjdk.java.net/pipermail/security-dev/2019-January/019142.html

{code}

Though, the above would cause a loss of all buffered data in 
{{_netOutputBuffer}}. Thus, we need to fix conditions causing a close of 
SSLEngine output


> Connection looping in NonBlockingConnectionTLSDelegate.doWrite()
> ----------------------------------------------------------------
>
>                 Key: QPID-8526
>                 URL: https://issues.apache.org/jira/browse/QPID-8526
>             Project: Qpid
>          Issue Type: Bug
>          Components: Broker-J
>    Affects Versions: qpid-java-broker-8.0.4
>            Reporter: Daniil Kirilyuk
>            Priority: Minor
>
> Issue is similar to QPID-8489: on certain conditions SSL connection thread 
> falls into an infinite loop consuming CPU.
> Stacktrace from the threaddump:
> {noformat}
> "IO-/127.0.0.1:50414" #32 prio=5 os_prio=0 cpu=43504522.88ms 
> elapsed=330519.20s tid=0x00007f47a0375000 nid=0x9089 runnable  
> [0x00007f47956fe000]
>    java.lang.Thread.State: RUNNABLE
>       at 
> sun.security.ssl.TransportContext.getHandshakeStatus([email protected]/TransportContext.java:571)
>       at 
> sun.security.ssl.SSLEngineImpl.getHandshakeStatus([email protected]/SSLEngineImpl.java:801)
>       - locked <0x00007f4b721e7340> (a sun.security.ssl.SSLEngineImpl)
>       at 
> org.apache.qpid.server.transport.NonBlockingConnectionTLSDelegate.wrapBufferArray(NonBlockingConnectionTLSDelegate.java:239)
>       at 
> org.apache.qpid.server.transport.NonBlockingConnectionTLSDelegate.doWrite(NonBlockingConnectionTLSDelegate.java:164)
>       at 
> org.apache.qpid.server.transport.NonBlockingConnection.doWrite(NonBlockingConnection.java:521)
>       at 
> org.apache.qpid.server.transport.NonBlockingConnection.shutdownFinalWrite(NonBlockingConnection.java:422)
>       at 
> org.apache.qpid.server.transport.NonBlockingConnection.shutdown(NonBlockingConnection.java:384)
>       at 
> org.apache.qpid.server.transport.NonBlockingConnection.doWork(NonBlockingConnection.java:313)
>       at 
> org.apache.qpid.server.transport.NetworkConnectionScheduler.processConnection(NetworkConnectionScheduler.java:134)
>       at 
> org.apache.qpid.server.transport.SelectorThread$ConnectionProcessor.processConnection(SelectorThread.java:575)
>       at 
> org.apache.qpid.server.transport.SelectorThread$SelectionTask.performSelect(SelectorThread.java:366)
>       at 
> org.apache.qpid.server.transport.SelectorThread$SelectionTask.run(SelectorThread.java:97)
>       at 
> org.apache.qpid.server.transport.SelectorThread.run(SelectorThread.java:533)
>       at 
> java.util.concurrent.ThreadPoolExecutor.runWorker([email protected]/ThreadPoolExecutor.java:1128)
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run([email protected]/ThreadPoolExecutor.java:628)
>       at 
> org.apache.qpid.server.bytebuffer.QpidByteBufferFactory.lambda$null$0(QpidByteBufferFactory.java:464)
>       at 
> org.apache.qpid.server.bytebuffer.QpidByteBufferFactory$$Lambda$64/0x00007f47d52bcc40.run(Unknown
>  Source)
>       at java.lang.Thread.run([email protected]/Thread.java:834)
> {noformat}
> Stacktrace 2 from the threaddump:
> {noformat}
> "IO-/127.0.0.1:50414" #32 prio=5 os_prio=0 cpu=43536330.84ms 
> elapsed=330555.26s tid=0x00007f47a0375000 nid=0x9089 runnable  
> [0x00007f47956fe000]
>    java.lang.Thread.State: RUNNABLE
>       at 
> org.apache.qpid.server.bytebuffer.QpidByteBufferFactory.encryptSSL(QpidByteBufferFactory.java:178)
>       at 
> org.apache.qpid.server.bytebuffer.QpidByteBuffer.encryptSSL(QpidByteBuffer.java:62)
>       at 
> org.apache.qpid.server.transport.NonBlockingConnectionTLSDelegate.wrapBufferArray(NonBlockingConnectionTLSDelegate.java:255)
>       at 
> org.apache.qpid.server.transport.NonBlockingConnectionTLSDelegate.doWrite(NonBlockingConnectionTLSDelegate.java:164)
>       at 
> org.apache.qpid.server.transport.NonBlockingConnection.doWrite(NonBlockingConnection.java:521)
>       at 
> org.apache.qpid.server.transport.NonBlockingConnection.shutdownFinalWrite(NonBlockingConnection.java:422)
>       at 
> org.apache.qpid.server.transport.NonBlockingConnection.shutdown(NonBlockingConnection.java:384)
>       at 
> org.apache.qpid.server.transport.NonBlockingConnection.doWork(NonBlockingConnection.java:313)
>       at 
> org.apache.qpid.server.transport.NetworkConnectionScheduler.processConnection(NetworkConnectionScheduler.java:134)
>       at 
> org.apache.qpid.server.transport.SelectorThread$ConnectionProcessor.processConnection(SelectorThread.java:575)
>       at 
> org.apache.qpid.server.transport.SelectorThread$SelectionTask.performSelect(SelectorThread.java:366)
>       at 
> org.apache.qpid.server.transport.SelectorThread$SelectionTask.run(SelectorThread.java:97)
>       at 
> org.apache.qpid.server.transport.SelectorThread.run(SelectorThread.java:533)
>       at 
> java.util.concurrent.ThreadPoolExecutor.runWorker([email protected]/ThreadPoolExecutor.java:1128)
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run([email protected]/ThreadPoolExecutor.java:628)
>       at 
> org.apache.qpid.server.bytebuffer.QpidByteBufferFactory.lambda$null$0(QpidByteBufferFactory.java:464)
>       at 
> org.apache.qpid.server.bytebuffer.QpidByteBufferFactory$$Lambda$64/0x00007f47d52bcc40.run(Unknown
>  Source)
>       at java.lang.Thread.run([email protected]/Thread.java:834)
> {noformat}
> Stucked connection details (retrieved via broker REST API):
> {noformat}
> {
>   "id" : "60b493c2-de91-4690-8e4c-1e3d5d5ea353",
>   "name" : "[8332442] 127.0.0.1:64711",
>   "type" : "AMQP_1_0",
>   "desiredState" : "ACTIVE",
>   "state" : "ACTIVE",
>   "durable" : false,
>   "lifetimePolicy" : "PERMANENT",
>   "incoming" : true,
>   "incomingIdleTimeout" : 60000,
>   "lastOpenedTime" : 1618942801846,
>   "maxUncommittedInMemorySize" : 10485760,
>   "outgoingIdleTimeout" : 0,
>   "port" : "amqps",
>   "protocol" : "AMQP_1_0",
>   "remoteAddress" : "/127.0.0.1:64711",
>   "sendSaslFinalChallengeAsChallenge" : false,
>   "sessionCountLimit" : 1,
>   "transport" : "SSL",
>   "transportInfo" : "TLSv1.2 ; TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256",
>   "lastUpdatedTime" : 1618942801846,
>   "createdTime" : 1618942801846,
>   "statistics" : {
>     "bytesIn" : 0,
>     "bytesOut" : 0,
>     "lastInboundMessageTime" : 1618942801846,
>     "lastIoTime" : 1618942801846,
>     "lastMessageTime" : 1618942801846,
>     "lastOutboundMessageTime" : 1618942801846,
>     "localTransactionBegins" : 0,
>     "localTransactionOpen" : 0,
>     "localTransactionRollbacks" : 0,
>     "messagesIn" : 0,
>     "messagesOut" : 0,
>     "sessionCount" : 0,
>     "transactedMessagesIn" : 0,
>     "transactedMessagesOut" : 0
>   }
> }
> {noformat}
> It seems that broker tries to close SSL connection and loops inside 
> NonBlockingConnection.shutdownFinalWrite() continuously calling 
> NonBlockingConnection.doWrite() -> NonBlockingConnectionTLSDelegate.doWrite() 
> -> NonBlockingConnectionTLSDelegate.wrapBufferArray(). 
> After adding circuit breaker and explicit logging in methods 
> NonBlockingConnection.doWrite(), NonBlockingConnectionTLSDelegate.doWrite() 
> and NonBlockingConnectionTLSDelegate.wrapBufferArray() following logs were 
> retrieved:
> {noformat}
> 2021-05-10 06:30:54,637 INFO  [Broker-Config] (q.m.c.open) - 
> [con:9,435,937(/127.0.0.1:52648)] CON-1001 : Open : Destination : 
> amqps(90.163.253.5:10170) : Protocol Version : 1.0 : SSL
> 2021-05-10 06:30:54,688 INFO  [IO-/127.0.0.1:52648] (q.m.c.open) - 
> [con:9,435,937(VTVTV_YYYYXXXXXZZZSSS@/127.0.0.1:52648/default)] CON-1001 : 
> Open : Destination : amqps(90.163.253.5:10170) : Protocol Version : 1.0 : SSL 
> : Client ID : Exxeta-299e32f1-1d0a-4db6-aeb8-1822411b7fc6 : Client Version : 
> 0.50.0 : Client Product : QpidJMS
> 2021-05-10 06:30:54,689 INFO  [IO-/127.0.0.1:52648] (q.m.a.allowed) - 
> [con:9,435,937(VTVTV_YYYYXXXXXZZZSSS@/127.0.0.1:52648/default)] ACL-1001 : 
> Allowed : Access Virtualhost NAME=default,VIRTUALHOST_NAME=default
> 2021-05-10 06:30:54,709 INFO  [IO-/127.0.0.1:52648] (q.m.c.create) - 
> [con:9,435,937(VTVTV_YYYYXXXXXZZZSSS@/127.0.0.1:52648/default)/ch:0] CHN-1001 
> : Create
> 2021-05-10 06:30:54,739 INFO  [IO-/127.0.0.1:52648] (q.m.c.create) - 
> [con:9,435,937(VTVTV_YYYYXXXXXZZZSSS@/127.0.0.1:52648/default)/ch:1] CHN-1001 
> : Create
> 2021-05-10 06:30:54,771 INFO  [VirtualHostNode-default-Config] 
> (q.m.a.allowed) - 
> [con:9,435,937(VTVTV_YYYYXXXXXZZZSSS@/127.0.0.1:52648/default)/ch:1] ACL-1001 
> : Allowed : Consume Queue 
> NAME=broadcast.VTVTV_YYYYXXXXXZZZSSS.TradeConfirmation,DURABLE=true,EXCLUSIVE=false,TEMPORARY=false,AUTO_DELETE=false,VIRTUALHOST_NAME=default,CREATED_BY=admin
> 2021-05-10 06:30:54,771 INFO  [VirtualHostNode-default-Config] (q.m.s.create) 
> - [con:9,435,937(VTVTV_YYYYXXXXXZZZSSS@/127.0.0.1:52648/default)/ch:1] 
> [sub:36,978(vh(/default)/qu(broadcast.VTVTV_YYYYXXXXXZZZSSS.TradeConfirmation)]
>  SUB-1001 : Create
> 2021-05-10 06:30:54,799 INFO  [VirtualHostNode-default-Config] 
> (q.m.a.allowed) - 
> [con:9,435,937(VTVTV_YYYYXXXXXZZZSSS@/127.0.0.1:52648/default)/ch:1] ACL-1001 
> : Allowed : Consume Queue 
> NAME=broadcast.VTVTV_YYYYXXXXXZZZSSS.Workflow,DURABLE=true,EXCLUSIVE=false,TEMPORARY=false,AUTO_DELETE=false,VIRTUALHOST_NAME=default,CREATED_BY=admin
> 2021-05-10 06:30:54,799 INFO  [VirtualHostNode-default-Config] (q.m.s.create) 
> - [con:9,435,937(VTVTV_YYYYXXXXXZZZSSS@/127.0.0.1:52648/default)/ch:1] 
> [sub:36,979(vh(/default)/qu(broadcast.VTVTV_YYYYXXXXXZZZSSS.Workflow)] 
> SUB-1001 : Create
> 2021-05-10 06:30:54,816 INFO  [VirtualHostNode-default-Config] 
> (q.m.a.allowed) - 
> [con:9,435,937(VTVTV_YYYYXXXXXZZZSSS@/127.0.0.1:52648/default)/ch:1] ACL-1001 
> : Allowed : Consume Queue 
> NAME=broadcast.VTVTV_YYYYXXXXXZZZSSS.Public,DURABLE=true,EXCLUSIVE=false,TEMPORARY=false,AUTO_DELETE=false,VIRTUALHOST_NAME=default,CREATED_BY=admin
> 2021-05-10 06:30:54,816 INFO  [VirtualHostNode-default-Config] (q.m.s.create) 
> - [con:9,435,937(VTVTV_YYYYXXXXXZZZSSS@/127.0.0.1:52648/default)/ch:1] 
> [sub:36,980(vh(/default)/qu(broadcast.VTVTV_YYYYXXXXXZZZSSS.Public)] SUB-1001 
> : Create
> 2021-05-10 06:30:54,834 INFO  [VirtualHostNode-default-Config] 
> (q.m.a.allowed) - 
> [con:9,435,937(VTVTV_YYYYXXXXXZZZSSS@/127.0.0.1:52648/default)/ch:1] ACL-1001 
> : Allowed : Consume Queue 
> NAME=response.VTVTV_YYYYXXXXXZZZSSS,DURABLE=true,EXCLUSIVE=false,TEMPORARY=false,AUTO_DELETE=false,VIRTUALHOST_NAME=default,CREATED_BY=admin
> 2021-05-10 06:30:54,834 INFO  [VirtualHostNode-default-Config] (q.m.s.create) 
> - [con:9,435,937(VTVTV_YYYYXXXXXZZZSSS@/127.0.0.1:52648/default)/ch:1] 
> [sub:36,981(vh(/default)/qu(response.VTVTV_YYYYXXXXXZZZSSS)] SUB-1001 : Create
> 2021-05-10 06:30:54,856 INFO  [IO-/127.0.0.1:52648] (q.m.s.create) - 
> [con:9,435,937(VTVTV_YYYYXXXXXZZZSSS@/127.0.0.1:52648/default)/ch:1] SND-1001 
> : Create : 
> qpid-jms:sender:ID:e72a83ab-2332-4e64-b891-0bf26cb8f632:1:1:1:request.VTVTV_YYYYXXXXXZZZSSS
>  : request.VTVTV_YYYYXXXXXZZZSSS
> 2021-05-10 10:01:40,576 INFO  [IO-/127.0.0.1:52648] (q.m.c.close) - 
> [con:9,435,937(VTVTV_YYYYXXXXXZZZSSS@/127.0.0.1:52648/default)/ch:0] 
> [con:9,435,937(VTVTV_YYYYXXXXXZZZSSS@/127.0.0.1:52648/default)/ch:0] CHN-1003 
> : Close
> 2021-05-10 10:01:40,576 INFO  [VirtualHostNode-default-Config] (q.m.s.close) 
> - [con:9,435,937(VTVTV_YYYYXXXXXZZZSSS@/127.0.0.1:52648/default)/ch:1] 
> [sub:36,978(vh(/default)/qu(broadcast.VTVTV_YYYYXXXXXZZZSSS.TradeConfirmation)]
>  SUB-1002 : Close
> 2021-05-10 10:01:40,576 INFO  [IO-/127.0.0.1:52648] (q.m.s.close) - 
> [con:9,435,937(VTVTV_YYYYXXXXXZZZSSS@/127.0.0.1:52648/default)/ch:1] SND-1002 
> : Close : 
> qpid-jms:sender:ID:e72a83ab-2332-4e64-b891-0bf26cb8f632:1:1:1:request.VTVTV_YYYYXXXXXZZZSSS
>  : request.VTVTV_YYYYXXXXXZZZSSS
> 2021-05-10 10:01:40,577 INFO  [VirtualHostNode-default-Config] (q.m.s.close) 
> - [con:9,435,937(VTVTV_YYYYXXXXXZZZSSS@/127.0.0.1:52648/default)/ch:1] 
> [sub:36,980(vh(/default)/qu(broadcast.VTVTV_YYYYXXXXXZZZSSS.Public)] SUB-1002 
> : Close
> 2021-05-10 10:01:40,578 INFO  [VirtualHostNode-default-Config] (q.m.s.close) 
> - [con:9,435,937(VTVTV_YYYYXXXXXZZZSSS@/127.0.0.1:52648/default)/ch:1] 
> [sub:36,981(vh(/default)/qu(response.VTVTV_YYYYXXXXXZZZSSS)] SUB-1002 : Close
> 2021-05-10 10:01:40,578 INFO  [VirtualHostNode-default-Config] (q.m.s.close) 
> - [con:9,435,937(VTVTV_YYYYXXXXXZZZSSS@/127.0.0.1:52648/default)/ch:1] 
> [sub:36,979(vh(/default)/qu(broadcast.VTVTV_YYYYXXXXXZZZSSS.Workflow)] 
> SUB-1002 : Close
> 2021-05-10 10:01:40,579 INFO  [IO-/127.0.0.1:52648] (q.m.c.close) - 
> [con:9,435,937(VTVTV_YYYYXXXXXZZZSSS@/127.0.0.1:52648/default)/ch:1] 
> [con:9,435,937(VTVTV_YYYYXXXXXZZZSSS@/127.0.0.1:52648/default)/ch:1] CHN-1003 
> : Close
> 2021-05-10 10:01:40,579 INFO  [IO-/127.0.0.1:52648] 
> (o.a.q.s.p.v.AMQPConnection_1_0Impl) - 
> [con:9,435,937(VTVTV_YYYYXXXXXZZZSSS@/127.0.0.1:52648/default)]  : Connection 
> closed with error : amqp:resource-limit-exceeded - local-idle-timeout expired
> 2021-05-10 10:01:40,644 WARN  [IO-/127.0.0.1:52648] 
> (o.a.q.s.t.NonBlockingConnectionTLSDelegate) - bufCount: 2
> 2021-05-10 10:01:40,644 WARN  [IO-/127.0.0.1:52648] 
> (o.a.q.s.t.NonBlockingConnectionTLSDelegate) - _status: [ Status = CLOSED, 
> HandshakeStatus = NOT_HANDSHAKING, bytesConsumed = 0, bytesProduced = 0 ], 
> _sslEngine.isOutboundDone(): true, _sslEngine.isInboundDone(): true, 
> _sslEngine.getPeerHost(): null, _sslEngine.getPeerPort(): -1, buffers.size(): 
> 2, _encryptedOutput.size(): 0, _netOutputBuffer.remaining(): 152185, 
> _sslEngine.getSession().getPacketBufferSize(): 16709, 
> _sslEngine.getSession().getCreationTime(): 1620621054549, 
> _sslEngine.getSession().getLastAccessedTime(): 1620621054549, 
> _sslEngine.getHandshakeSession().isValid(): null handshake session
> 2021-05-10 10:01:40,645 WARN  [IO-/127.0.0.1:52648] 
> (o.a.q.s.t.NonBlockingConnectionTLSDelegate) - buffers.size(): 2, bufsSent: 
> false, bytesWritten: -1, _encryptedOutput: 0
> 2021-05-10 10:01:40,645 WARN  [IO-/127.0.0.1:52648] 
> (o.a.q.s.t.NonBlockingConnection) - Looping detected: false, 0, 2
> 2021-05-10 10:01:40,645 WARN  [IO-/127.0.0.1:52648] 
> (o.a.q.s.t.NonBlockingConnectionTLSDelegate) - bufCount: 2
> 2021-05-10 10:01:40,645 WARN  [IO-/127.0.0.1:52648] 
> (o.a.q.s.t.NonBlockingConnectionTLSDelegate) - _status: [ Status = CLOSED, 
> HandshakeStatus = NOT_HANDSHAKING, bytesConsumed = 0, bytesProduced = 0 ], 
> _sslEngine.isOutboundDone(): true, _sslEngine.isInboundDone(): true, 
> _sslEngine.getPeerHost(): null, _sslEngine.getPeerPort(): -1, buffers.size(): 
> 2, _encryptedOutput.size(): 0, _netOutputBuffer.remaining(): 152185, 
> _sslEngine.getSession().getPacketBufferSize(): 16709, 
> _sslEngine.getSession().getCreationTime(): 1620621054549, 
> _sslEngine.getSession().getLastAccessedTime(): 1620621054549, 
> _sslEngine.getHandshakeSession().isValid(): null handshake session
> 2021-05-10 10:01:40,645 WARN  [IO-/127.0.0.1:52648] 
> (o.a.q.s.t.NonBlockingConnectionTLSDelegate) - buffers.size(): 2, bufsSent: 
> false, bytesWritten: -1, _encryptedOutput: 0
> 2021-05-10 10:01:40,645 WARN  [IO-/127.0.0.1:52648] 
> (o.a.q.s.t.NonBlockingConnection) - Looping detected: false, 0, 2
> 2021-05-10 10:01:40,645 WARN  [IO-/127.0.0.1:52648] 
> (o.a.q.s.t.NonBlockingConnectionTLSDelegate) - bufCount: 2
> 2021-05-10 10:01:40,645 WARN  [IO-/127.0.0.1:52648] 
> (o.a.q.s.t.NonBlockingConnectionTLSDelegate) - _status: [ Status = CLOSED, 
> HandshakeStatus = NOT_HANDSHAKING, bytesConsumed = 0, bytesProduced = 0 ], 
> _sslEngine.isOutboundDone(): true, _sslEngine.isInboundDone(): true, 
> _sslEngine.getPeerHost(): null, _sslEngine.getPeerPort(): -1, buffers.size(): 
> 2, _encryptedOutput.size(): 0, _netOutputBuffer.remaining(): 152185, 
> _sslEngine.getSession().getPacketBufferSize(): 16709, 
> _sslEngine.getSession().getCreationTime(): 1620621054549, 
> _sslEngine.getSession().getLastAccessedTime(): 1620621054549, 
> _sslEngine.getHandshakeSession().isValid(): null handshake session
> 2021-05-10 10:01:40,645 WARN  [IO-/127.0.0.1:52648] 
> (o.a.q.s.t.NonBlockingConnectionTLSDelegate) - buffers.size(): 2, bufsSent: 
> false, bytesWritten: -1, _encryptedOutput: 0
> 2021-05-10 10:01:40,645 WARN  [IO-/127.0.0.1:52648] 
> (o.a.q.s.t.NonBlockingConnection) - Looping detected: false, 0, 2
> 2021-05-10 10:01:40,645 WARN  [IO-/127.0.0.1:52648] 
> (o.a.q.s.t.NonBlockingConnectionTLSDelegate) - bufCount: 2
> 2021-05-10 10:01:40,645 WARN  [IO-/127.0.0.1:52648] 
> (o.a.q.s.t.NonBlockingConnectionTLSDelegate) - _status: [ Status = CLOSED, 
> HandshakeStatus = NOT_HANDSHAKING, bytesConsumed = 0, bytesProduced = 0 ], 
> _sslEngine.isOutboundDone(): true, _sslEngine.isInboundDone(): true, 
> _sslEngine.getPeerHost(): null, _sslEngine.getPeerPort(): -1, buffers.size(): 
> 2, _encryptedOutput.size(): 0, _netOutputBuffer.remaining(): 152185, 
> _sslEngine.getSession().getPacketBufferSize(): 16709, 
> _sslEngine.getSession().getCreationTime(): 1620621054549, 
> _sslEngine.getSession().getLastAccessedTime(): 1620621054549, 
> _sslEngine.getHandshakeSession().isValid(): null handshake session
> 2021-05-10 10:01:40,645 WARN  [IO-/127.0.0.1:52648] 
> (o.a.q.s.t.NonBlockingConnectionTLSDelegate) - buffers.size(): 2, bufsSent: 
> false, bytesWritten: -1, _encryptedOutput: 0
> 2021-05-10 10:01:40,645 WARN  [IO-/127.0.0.1:52648] 
> (o.a.q.s.t.NonBlockingConnection) - Looping detected: false, 0, 2
> 2021-05-10 10:01:40,645 WARN  [IO-/127.0.0.1:52648] 
> (o.a.q.s.t.NonBlockingConnectionTLSDelegate) - bufCount: 2
> 2021-05-10 10:01:40,646 WARN  [IO-/127.0.0.1:52648] 
> (o.a.q.s.t.NonBlockingConnectionTLSDelegate) - _status: [ Status = CLOSED, 
> HandshakeStatus = NOT_HANDSHAKING, bytesConsumed = 0, bytesProduced = 0 ], 
> _sslEngine.isOutboundDone(): true, _sslEngine.isInboundDone(): true, 
> _sslEngine.getPeerHost(): null, _sslEngine.getPeerPort(): -1, buffers.size(): 
> 2, _encryptedOutput.size(): 0, _netOutputBuffer.remaining(): 152185, 
> _sslEngine.getSession().getPacketBufferSize(): 16709, 
> _sslEngine.getSession().getCreationTime(): 1620621054549, 
> _sslEngine.getSession().getLastAccessedTime(): 1620621054549, 
> _sslEngine.getHandshakeSession().isValid(): null handshake session
> 2021-05-10 10:01:40,646 INFO  [IO-/127.0.0.1:52648] 
> (o.a.q.s.t.NonBlockingConnection) - Exception performing final write/close 
> for '/127.0.0.1:52648': Looping detected, executing circuit breaker
> 2021-05-10 10:01:40,647 INFO  [Broker-Config] (q.m.c.close) - 
> [con:9,435,937(VTVTV_YYYYXXXXXZZZSSS@null/default)] CON-1002 : Close
> {noformat}
> Noticeable is SSLEngineResult.Status.CLOSED as well as 
> SSLEngineResult.HandshakeStatus NOT_HANDSHAKING. Combination of those 
> statuses indicates that the last operation closed broker side of the 
> SSLEngine, or the operation could not be completed because it was already 
> closed.



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