Jean-Louis Monteiro created AMQ-9693:
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Summary: DeadLock in RA ServerSessionImpl
Key: AMQ-9693
URL: https://issues.apache.org/jira/browse/AMQ-9693
Project: ActiveMQ Classic
Issue Type: Bug
Components: RAR
Affects Versions: 5.18.7, 6.1.6, 5.19.0
Reporter: Jean-Louis Monteiro
I am running into a DeadLock issue with ActiveMQ Resource adapter.
The start method relies on a synchronized block (based on an instance object,
not final btw). At the same time, run() which is executed on another thread.
That thread might decide to remove the session from the pool when a session is
stale (see around line 190, the finally block). But the removeFromPool may
result in start() being called to dispatch unconsumed messages, hence producing
such deadlock
{code:java}
java.lang.Thread.State: BLOCKED (on object monitor)
at org.apache.activemq.ra.ServerSessionImpl.start(ServerSessionImpl.java:123)
- waiting to lock <0x00000005943ea820> (a java.lang.Object)
at
org.apache.activemq.ra.ServerSessionPoolImpl.dispatchToSession(ServerSessionPoolImpl.java:274)
at
org.apache.activemq.ra.ServerSessionPoolImpl.removeFromPool(ServerSessionPoolImpl.java:235)
at org.apache.activemq.ra.ServerSessionImpl.run(ServerSessionImpl.java:190)
- locked <0x00000005943ea980> (a java.lang.Object)
at org.apache.geronimo.connector.work.WorkerContext.run(WorkerContext.java:366)
at
org.apache.geronimo.connector.work.pool.NamedRunnable.run(NamedRunnable.java:32)
at
java.util.concurrent.ThreadPoolExecutor.runWorker([email protected]/ThreadPoolExecutor.java:1144)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run([email protected]/ThreadPoolExecutor.java:642)
at java.lang.Thread.runWith([email protected]/Thread.java:1596)
at java.lang.Thread.run([email protected]/Thread.java:1583)
Locked ownable synchronizers:
- <0x00000005a29cc220> (a
java.util.concurrent.ThreadPoolExecutor$Worker) {code}
I will open a PR shortly to provide a simple fix.
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