Keith Wall created QPID-6649:
--------------------------------
Summary: Client initiated connection close can race with Broker
shutdown leading to exception and unclosed socket
Key: QPID-6649
URL: https://issues.apache.org/jira/browse/QPID-6649
Project: Qpid
Issue Type: Bug
Components: Java Broker
Reporter: Keith Wall
Assignee: Keith Wall
Fix For: 6.0 [Java]
There is a potential for a race in the Java Broker that is being exposed by the
System Tests. The unlucky case is as follows. The client closes the
connection by sending ConnectionClose. On receiving this,
ServerConnectionDelegate.connectionClose() invokes ServerConnection.setState()
which invokes AbstractVirtualHost.deregisterConnectionAsync(). This causes the
AVH to 'forget' the connection (removed from AVH#_connections) even though it
is not yet closed. Meanwhile, QBTC begins to close the Broker. The Broker
closes the AVH which calls closeConnections - but the connection is already for
forgotten (_connections#size() == 0) so as far as it is concerned there are no
connections to await for, so the VH close concludes and the VHN shutdowns the
VH's executor. Then the IO thread gets scheduled, sends the ConnectionCloseOk
bytes down the wire and then NBC#shutdown invokes MVPE#close.... which finally
invokesServerConnection.setState which calls
AbstractVirtualHost.deregisterConnectionAsync, which fails (stack trace from
email earlier today) because the task executor is already closed.
This causes a socket to remain open.
{noformat}
015-07-19 17:57:53,998 ERROR [virtualhost-test-iopool-7]
o.a.q.t.u.InternalBrokerHolder Uncaught exception from thread
virtualhost-test-iopool-7
java.lang.IllegalStateException: Task executor is not in ACTIVE state
at
org.apache.qpid.server.configuration.updater.TaskExecutorImpl.checkState(TaskExecutorImpl.java:310)
~[qpid-broker-core-6.0.0-SNAPSHOT.jar:6.0.0-SNAPSHOT]
at
org.apache.qpid.server.configuration.updater.TaskExecutorImpl.submit(TaskExecutorImpl.java:141)
~[qpid-broker-core-6.0.0-SNAPSHOT.jar:6.0.0-SNAPSHOT]
at
org.apache.qpid.server.model.AbstractConfiguredObject.doOnConfigThread(AbstractConfiguredObject.java:499)
~[qpid-broker-core-6.0.0-SNAPSHOT.jar:6.0.0-SNAPSHOT]
at
org.apache.qpid.server.model.AbstractConfiguredObject.setDesiredState(AbstractConfiguredObject.java:1315)
~[qpid-broker-core-6.0.0-SNAPSHOT.jar:6.0.0-SNAPSHOT]
at
org.apache.qpid.server.model.AbstractConfiguredObject.deleteAsync(AbstractConfiguredObject.java:1837)
~[qpid-broker-core-6.0.0-SNAPSHOT.jar:6.0.0-SNAPSHOT]
at
org.apache.qpid.server.model.AbstractConfiguredObject.delete(AbstractConfiguredObject.java:1766)
~[qpid-broker-core-6.0.0-SNAPSHOT.jar:6.0.0-SNAPSHOT]
at
org.apache.qpid.server.exchange.AbstractExchange.removeBinding(AbstractExchange.java:666)
~[qpid-broker-core-6.0.0-SNAPSHOT.jar:na]
at
org.apache.qpid.server.exchange.AbstractExchange.access$000(AbstractExchange.java:80)
~[qpid-broker-core-6.0.0-SNAPSHOT.jar:na]
at
org.apache.qpid.server.exchange.AbstractExchange$1.stateChanged(AbstractExchange.java:138)
~[qpid-broker-core-6.0.0-SNAPSHOT.jar:na]
at
org.apache.qpid.server.exchange.AbstractExchange$1.stateChanged(AbstractExchange.java:132)
~[qpid-broker-core-6.0.0-SNAPSHOT.jar:na]
at
org.apache.qpid.server.binding.BindingImpl.doDelete(BindingImpl.java:208)
~[qpid-broker-core-6.0.0-SNAPSHOT.jar:6.0.0-SNAPSHOT]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
~[na:1.8.0_45]
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
~[na:1.8.0_45]
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
~[na:1.8.0_45]
at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_45]
at
org.apache.qpid.server.model.AbstractConfiguredObject.attainState(AbstractConfiguredObject.java:1194)
~[qpid-broker-core-6.0.0-SNAPSHOT.jar:6.0.0-SNAPSHOT]
at
org.apache.qpid.server.model.AbstractConfiguredObject.attainStateIfOpenedOrReopenFailed(AbstractConfiguredObject.java:1162)
~[qpid-broker-core-6.0.0-SNAPSHOT.jar:6.0.0-SNAPSHOT]
at
org.apache.qpid.server.model.AbstractConfiguredObject.access$1500(AbstractConfiguredObject.java:83)
~[qpid-broker-core-6.0.0-SNAPSHOT.jar:6.0.0-SNAPSHOT]
at
org.apache.qpid.server.model.AbstractConfiguredObject$15.call(AbstractConfiguredObject.java:1354)
~[qpid-broker-core-6.0.0-SNAPSHOT.jar:6.0.0-SNAPSHOT]
at
org.apache.qpid.server.model.AbstractConfiguredObject$15.call(AbstractConfiguredObject.java:1316)
~[qpid-broker-core-6.0.0-SNAPSHOT.jar:6.0.0-SNAPSHOT]
at
org.apache.qpid.server.model.AbstractConfiguredObject$2.execute(AbstractConfiguredObject.java:507)
~[qpid-broker-core-6.0.0-SNAPSHOT.jar:6.0.0-SNAPSHOT]
at
org.apache.qpid.server.model.AbstractConfiguredObject$2.execute(AbstractConfiguredObject.java:500)
~[qpid-broker-core-6.0.0-SNAPSHOT.jar:6.0.0-SNAPSHOT]
at
org.apache.qpid.server.configuration.updater.TaskExecutorImpl.executeTask(TaskExecutorImpl.java:317)
~[qpid-broker-core-6.0.0-SNAPSHOT.jar:6.0.0-SNAPSHOT]
at
org.apache.qpid.server.configuration.updater.TaskExecutorImpl.access$700(TaskExecutorImpl.java:48)
~[qpid-broker-core-6.0.0-SNAPSHOT.jar:6.0.0-SNAPSHOT]
at
org.apache.qpid.server.configuration.updater.TaskExecutorImpl$CallableWrapper$1.run(TaskExecutorImpl.java:361)
~[qpid-broker-core-6.0.0-SNAPSHOT.jar:6.0.0-SNAPSHOT]
at java.security.AccessController.doPrivileged(Native Method)
~[na:1.8.0_45]
at javax.security.auth.Subject.doAs(Subject.java:360) ~[na:1.8.0_45]
at
org.apache.qpid.server.configuration.updater.TaskExecutorImpl$CallableWrapper.call(TaskExecutorImpl.java:356)
~[qpid-broker-core-6.0.0-SNAPSHOT.jar:6.0.0-SNAPSHOT]
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
~[na:1.8.0_45]
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
~[na:1.8.0_45]
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
~[na:1.8.0_45]
at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_45]
{noformat}
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