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https://issues.apache.org/jira/browse/FELIX-4523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14044546#comment-14044546
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David Bosschaert commented on FELIX-4523:
-----------------------------------------
FWIW I have also tried the patch and haven't found any issues. But... I haven't
run it in a context where multiple frameworks are present, which I guess is
where this thing really gets hammered.
> Deadlock in URLHandlers when Felix.init and Felix.stop are called concurrently
> ------------------------------------------------------------------------------
>
> Key: FELIX-4523
> URL: https://issues.apache.org/jira/browse/FELIX-4523
> Project: Felix
> Issue Type: Bug
> Components: Framework
> Affects Versions: framework-4.2.1
> Environment: linux, junittests
> Reporter: Benjamin Rogge
> Assignee: Karl Pauls
> Attachments: urlhandlers-2.patch, urlhandlers.patch
>
>
> From time to time we are experiencing a deadlock in the URLHandlers Class in
> Apache Felix. We are using Felix as an embedded OSGi Container and
> instantiate the Felix Framework via ServiceLoader and Framework Factory
> ourselves. The situation is as follows: When Felix.stop and Felix.init are
> called by different threads, eventually
> URLHandlers.unregisterFrameworkListsForContextSearch and
> URLHandlers.registerFrameworkInstance are called by the threads. There are
> two locks: m_frameworks and the Class Object of URL (URL.class).
> registerFrameworkInstance tries to aquire m_frameworks first and via the
> constructor of URLHanders URL.class after that.
> unregisterFrameworkListsForContextSearch tries to aquire URL.class first and
> m_frameworks after that. This is a classic deadlock situation. The situation
> arises in unittests where we frequently start and stop the felix framework.
> Stacktracke log:
> {code}
> Found one Java-level deadlock:
> =============================
> "FelixShutdown":
> waiting to lock monitor 0x0000000000ff7710 (object 0x00000007ff33e7f0, a
> java.util.ArrayList),
> which is held by "main"
> "main":
> waiting to lock monitor 0x00000000022c4a08 (object 0x0000000783b06b18, a
> java.lang.Class),
> which is held by "FelixShutdown"
> Java stack information for the threads listed above:
> ===================================================
> "FelixShutdown":
> at
> org.apache.felix.framework.URLHandlers.unregisterFrameworkListsForContextSearch(URLHandlers.java:315)
> - waiting to lock <0x00000007ff33e7f0> (a java.util.ArrayList)
> - locked <0x00000007ff33e840> (a java.util.HashMap)
> - locked <0x0000000783b06b18> (a java.lang.Class for java.net.URL)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at
> org.apache.felix.framework.util.SecureAction.invoke(SecureAction.java:840)
> at
> org.apache.felix.framework.URLHandlers.unregisterFrameworkInstance(URLHandlers.java:635)
> at
> org.apache.felix.framework.URLHandlersActivator.stop(URLHandlersActivator.java:76)
> at
> org.apache.felix.framework.util.SecureAction.stopActivator(SecureAction.java:667)
> at
> org.apache.felix.framework.Felix$SystemBundleActivator.stop(Felix.java:4715)
> at
> org.apache.felix.framework.util.SecureAction.stopActivator(SecureAction.java:667)
> at org.apache.felix.framework.Felix.stopBundle(Felix.java:2530)
> at org.apache.felix.framework.Felix$2.run(Felix.java:959)
> at java.lang.Thread.run(Thread.java:724)
> "main":
> at org.apache.felix.framework.URLHandlers.<init>(URLHandlers.java:150)
> - waiting to lock <0x0000000783b06b18> (a java.lang.Class for
> java.net.URL)
> at
> org.apache.felix.framework.URLHandlers.registerFrameworkInstance(URLHandlers.java:600)
> - locked <0x00000007ff33e7f0> (a java.util.ArrayList)
> at
> org.apache.felix.framework.URLHandlersActivator.start(URLHandlersActivator.java:71)
> at
> org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:645)
> at
> org.apache.felix.framework.Felix$SystemBundleActivator.start(Felix.java:4634)
> at
> org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:645)
> at org.apache.felix.framework.Felix.init(Felix.java:783)
> {code}
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