[jboss-osgi-issues] [JBoss JIRA] (JBOSGI-622) Deadlock in Module FallbackClassLoader

[Steve Reed (JIRA)]

Steve Reed created JBOSGI-622:
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             Summary: Deadlock in Module FallbackClassLoader
                 Key: JBOSGI-622
                 URL: https://issues.jboss.org/browse/JBOSGI-622
             Project: JBoss OSGi
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: Blueprint
    Affects Versions: JBossOSGi 2.0.0
            Reporter: Steve Reed
            Assignee: Thomas Diesler


Actually the version is 2.0.1.final - jbosgi-framework-core-2.0.1.Final.jar

Commit reference for JBOSS AS :- https://github.com/jbossas/jboss-as/commit/ed2bc551a55ec6a8167a8657cbb5d8abc6e07748

During start up of JBOSS AS7.0 two GeminiBlueprintExtender Threads deadlock, and services in the JBOSS OSGI container are not started. 

The deadlock appears to be concerned with a Module FallbackLoader, which acquires a lock during a call to loadClassLocal() and then proceeds to use an alternate Module to load the class, if this results in the alternate Module using it's FallbackLoader to load a class or resource, then it must also acquire a lock first. Obviously if two or more threads are attempting this, then a dead lock is possible.

I will attach the thread dump to this issue as supporting evidence.

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