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https://issues.apache.org/jira/browse/AMQ-6046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15362842#comment-15362842
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Christopher L. Shannon commented on AMQ-6046:
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I ran into a deadlock today when working on MQTT and AMQ-6343. I verified that
it is the same problem as this fix was never applied to MQTT. I will go ahead
and do that in a new Jira.
> Concurrent access to a Transport from WebSocket client can deadlock
> -------------------------------------------------------------------
>
> Key: AMQ-6046
> URL: https://issues.apache.org/jira/browse/AMQ-6046
> Project: ActiveMQ
> Issue Type: Bug
> Components: MQTT, stomp, Transport
> Affects Versions: 5.12.0, 5.12.1, 5.11.3
> Reporter: Timothy Bish
> Assignee: Timothy Bish
> Fix For: 5.13.0
>
>
> WebSocket connections can encounter a deadlock when the Jetty side allows for
> concurrent access to the Transport instance that forwards commands onto the
> broker core. This seems to happen mostly in cases where a message or other
> action is incoming at the same time as Jetty is closing the connection due to
> idle timeout or some other cause.
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