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From "Richard S. Hall (JIRA)" <j...@apache.org>
Subject [jira] Closed: (FELIX-2597) Deadlock during delivery of resolved event
Date Wed, 15 Sep 2010 20:12:05 GMT

     [ https://issues.apache.org/jira/browse/FELIX-2597?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Richard S. Hall closed FELIX-2597.
----------------------------------

    Resolution: Fixed

I've committed a patch for this.

> Deadlock during delivery of resolved event
> ------------------------------------------
>
>                 Key: FELIX-2597
>                 URL: https://issues.apache.org/jira/browse/FELIX-2597
>             Project: Felix
>          Issue Type: Improvement
>          Components: Framework
>    Affects Versions: framework-3.0.2
>            Reporter: Richard S. Hall
>            Assignee: Richard S. Hall
>            Priority: Minor
>             Fix For: framework-3.0.3
>
>
> When the framework resolves a bundle, it fires the RESOLVED event to synchronous bundle
listeners while holding the global lock. This caused a deadlock in a specific scenario where
two threads T1 and T2 were racing to resolve bundles B1 and B2, respectively. T1 was resolving
a dynamic import for B1 which started from a loadClassInternal() call from the JVM which locks
B1's class loader. T1 lost the race for the global lock and had to wait for T2 to do its resolve
of B2. T2 resolved B2 and ended up firing a RESOLVED event to B1. In B1's callback method,
a loadClassInternal() was triggered by T2 when it accessed some static, which caused it to
deadlock when the JRE tried to lock the B1's class loader on T2, which was already held by
T1.
> This issue is actually related to the JVM being too aggressively in its locking of class
loaders:
>     http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4670071
> Regardless, we might be able to loosen this up a little bit by not holding the global
lock at all. This might slightly violate the definition of synchronous bundle listener, since
the state could change, but at least it will still be delivered synchronously on the instigating
thread.
> More information here:
> https://glassfish.dev.java.net/issues/show_bug.cgi?id=13329

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