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https://issues.apache.org/jira/browse/AMQ-9693?focusedWorklogId=967952&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-967952
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ASF GitHub Bot logged work on AMQ-9693:
---------------------------------------
Author: ASF GitHub Bot
Created on: 29/Apr/25 07:52
Start Date: 29/Apr/25 07:52
Worklog Time Spent: 10m
Work Description: jeanouii commented on PR #1420:
URL: https://github.com/apache/activemq/pull/1420#issuecomment-2837842939
@jbonofre It should be all green now
Issue Time Tracking
-------------------
Worklog Id: (was: 967952)
Time Spent: 1h 10m (was: 1h)
> 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: 5.19.0, 6.1.6, 5.18.7
> Reporter: Jean-Louis Monteiro
> Priority: Major
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> 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(java.base@21.0.3/ThreadPoolExecutor.java:1144)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@21.0.3/ThreadPoolExecutor.java:642)
> at java.lang.Thread.runWith(java.base@21.0.3/Thread.java:1596)
> at java.lang.Thread.run(java.base@21.0.3/Thread.java:1583)
> Locked ownable synchronizers:
> - <0x00000005a29cc220> (a
> java.util.concurrent.ThreadPoolExecutor$Worker) {code}
> I will open a PR shortly to provide a simple fix.
>
>
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