yangwei created ARTEMIS-2257:
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Summary: Synchronize SharedEventLoopGroup shutdownGracefully to
prevent race conditions
Key: ARTEMIS-2257
URL: https://issues.apache.org/jira/browse/ARTEMIS-2257
Project: ActiveMQ Artemis
Issue Type: Bug
Components: Broker
Affects Versions: 2.6.4
Reporter: yangwei
While thread a shutdowns shared event loop, between scheduling a task and set
the shutdown reference thread b calls getInstance() and retrieves ready
shutting down instance. Add synchronized block to fix the problem.
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