Gary Tully created AMQ-7106:
-------------------------------
Summary: TransportConnection pendingStop support during start is
broken
Key: AMQ-7106
URL: https://issues.apache.org/jira/browse/AMQ-7106
Project: ActiveMQ
Issue Type: Bug
Components: Transport
Affects Versions: 5.15.0
Environment: mqtt nio ssl
Reporter: Gary Tully
Assignee: Gary Tully
Fix For: 5.16.0
If start blocks, the inactivity monitor can kick in. The intent is that it can
see the starting state and initiate a pending stop and complete.
The current synchronization breaks tis b/c the start code holds a lock for its
duration and the which requires the stopAsync code to block in error.
This means there is a blocked inactivity monitor thread per blocked starting
connection.
A blocked ssl handshake can demonstrate.
{code}
"MQTTInactivityMonitor Async Task:
java.util.concurrent.ThreadPoolExecutor$Worker@7c1745f4[State = -1, empty
queue]" #4412 daemon prio=5 os_prio=0 tid=0x00007fd524f2c800 nid=0x622d waiting
for monitor entry [0x00007fd393776000]
java.lang.Thread.State: BLOCKED (on object monitor)
at
org.apache.activemq.broker.TransportConnection.stopAsync(TransportConnection.java:1136)
- waiting to lock <0x00000004dc8059b0> (a
org.apache.activemq.broker.jmx.ManagedTransportConnection)
at
org.apache.activemq.broker.jmx.ManagedTransportConnection.stopAsync(ManagedTransportConnection.java:66)
at
org.apache.activemq.broker.TransportConnection.stopAsync(TransportConnection.java:1131)
at
org.apache.activemq.broker.TransportConnection.serviceTransportException(TransportConnection.java:235)
at
org.apache.activemq.broker.TransportConnection$1.onException(TransportConnection.java:206)
at
org.apache.activemq.transport.TransportFilter.onException(TransportFilter.java:101)
at
org.apache.activemq.transport.mqtt.MQTTInactivityMonitor.onException(MQTTInactivityMonitor.java:196)
at
org.apache.activemq.transport.mqtt.MQTTInactivityMonitor$1$1.run(MQTTInactivityMonitor.java:81)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Locked ownable synchronizers:
- <0x00000004d7803c60> (a
java.util.concurrent.ThreadPoolExecutor$Worker)
{code}
{code}"ActiveMQ BrokerService[BB] Task-51959" #4414527 daemon prio=5 os_prio=0
tid=0x00007fd5f83b9800 nid=0x1846 runnable [0x00007fd3873b3000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:93)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
- locked <0x00000004dc805830> (a sun.nio.ch.Util$3)
- locked <0x00000004dc805820> (a java.util.Collections$UnmodifiableSet)
- locked <0x00000004dc805840> (a sun.nio.ch.EPollSelectorImpl)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
at
org.apache.activemq.transport.nio.NIOSSLTransport.doHandshake(NIOSSLTransport.java:380)
at
org.apache.activemq.transport.nio.NIOSSLTransport.initializeStreams(NIOSSLTransport.java:137)
at
org.apache.activemq.transport.mqtt.MQTTNIOSSLTransport.initializeStreams(MQTTNIOSSLTransport.java:46)
at
org.apache.activemq.transport.tcp.TcpTransport.connect(TcpTransport.java:519)
at
org.apache.activemq.transport.nio.NIOTransport.doStart(NIOTransport.java:160)
at
org.apache.activemq.transport.nio.NIOSSLTransport.doStart(NIOSSLTransport.java:412)
at org.apache.activemq.util.ServiceSupport.start(ServiceSupport.java:55)
at
org.apache.activemq.transport.TransportFilter.start(TransportFilter.java:58)
at
org.apache.activemq.transport.mqtt.MQTTTransportFilter.start(MQTTTransportFilter.java:157)
at
org.apache.activemq.transport.mqtt.MQTTInactivityMonitor.start(MQTTInactivityMonitor.java:148)
at
org.apache.activemq.transport.TransportFilter.start(TransportFilter.java:58)
at
org.apache.activemq.broker.TransportConnection.start(TransportConnection.java:1066)
- locked <0x00000004dc8059b0> (a
org.apache.activemq.broker.jmx.ManagedTransportConnection)
at
org.apache.activemq.broker.TransportConnector$1$1.run(TransportConnector.java:218)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Locked ownable synchronizers:
- <0x00000004dc805a78> (a
java.util.concurrent.ThreadPoolExecutor$Worker){code}
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