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From "Amichai Rothman (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DOSGI-163) Deadlock when shutting down
Date Tue, 02 Apr 2013 13:05:15 GMT
Amichai Rothman created DOSGI-163:
-------------------------------------

             Summary: Deadlock when shutting down
                 Key: DOSGI-163
                 URL: https://issues.apache.org/jira/browse/DOSGI-163
             Project: CXF Distributed OSGi
          Issue Type: Bug
          Components: DSW
    Affects Versions: 1.4.0
         Environment: Oracle JDK 1.7.0_17, Karaf 2.3.1, DOSGi 1.4.0
            Reporter: Amichai Rothman
         Attachments: fix_dosgi_unregister_deadlock.diff

Karaf sometimes hangs while shutting down, and a thread dump shows a deadlock in DOSGi. In
general, the OSGi specs recommend not to hold any locks when calling the APIs since it can
result in a deadlock, as is the case here.

A proposed fix calls ServiceRegistration.unregister outside of the synchronized block in ImportRegistrationImpl.close
(note that it still is synchronized when called from closeAll, which may pose a related but
separate problem - but the fix does fix this specific deadlock as it was encountered here).

Found one Java-level deadlock:
=============================
"pool-18-thread-3":
  waiting to lock monitor 0x00007f0658003f40 (object 0x00000000e5b485b0, a org.eclipse.osgi.internal.serviceregistry.ServiceUse),
  which is held by "Blueprint Extender: 2"
"Blueprint Extender: 2":
  waiting to lock monitor 0x00007f0654002a50 (object 0x00000000f1b70240, a org.apache.cxf.dosgi.dsw.service.ImportRegistrationImpl),
  which is held by "pool-18-thread-3"

Java stack information for the threads listed above:
===================================================
"pool-18-thread-3":
        at org.eclipse.osgi.internal.serviceregistry.ServiceRegistrationImpl.releaseService(ServiceRegistrationImpl.java:562)
        - waiting to lock <0x00000000e5b485b0> (a org.eclipse.osgi.internal.serviceregistry.ServiceUse)
        at org.eclipse.osgi.internal.serviceregistry.ServiceRegistrationImpl.unregister(ServiceRegistrationImpl.java:245)
        at org.apache.cxf.dosgi.dsw.service.ImportRegistrationImpl.instanceClosed(ImportRegistrationImpl.java:118)
        - locked <0x00000000f1b70240> (a org.apache.cxf.dosgi.dsw.service.ImportRegistrationImpl)
        at org.apache.cxf.dosgi.dsw.service.ImportRegistrationImpl.close(ImportRegistrationImpl.java:100)
        - locked <0x00000000f1b70240> (a org.apache.cxf.dosgi.dsw.service.ImportRegistrationImpl)
        at org.apache.cxf.dosgi.topologymanager.importer.TopologyManagerImport.unexportNotAvailableServices(TopologyManagerImport.java:227)
        at org.apache.cxf.dosgi.topologymanager.importer.TopologyManagerImport.access$200(TopologyManagerImport.java:53)
        at org.apache.cxf.dosgi.topologymanager.importer.TopologyManagerImport$2.run(TopologyManagerImport.java:201)
        - locked <0x00000000ea71b6c0> (a java.util.HashMap)
        - locked <0x00000000ea71b6f8> (a java.util.HashMap)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:722)
"Blueprint Extender: 2":
        at org.apache.cxf.dosgi.dsw.service.ImportRegistrationImpl.closeAll(ImportRegistrationImpl.java:127)
        - waiting to lock <0x00000000f1b70240> (a org.apache.cxf.dosgi.dsw.service.ImportRegistrationImpl)
        at org.apache.cxf.dosgi.dsw.service.ClientServiceFactory.remove(ClientServiceFactory.java:110)
        at org.apache.cxf.dosgi.dsw.service.ClientServiceFactory.ungetService(ClientServiceFactory.java:104)
        - locked <0x00000000f1b6f7e0> (a org.apache.cxf.dosgi.dsw.service.ClientServiceFactory)
        at org.eclipse.osgi.internal.serviceregistry.ServiceUse$2.run(ServiceUse.java:238)
        at java.security.AccessController.doPrivileged(Native Method)
        at org.eclipse.osgi.internal.serviceregistry.ServiceUse.ungetService(ServiceUse.java:236)
        at org.eclipse.osgi.internal.serviceregistry.ServiceRegistrationImpl.ungetService(ServiceRegistrationImpl.java:518)
        - locked <0x00000000e5b485b0> (a org.eclipse.osgi.internal.serviceregistry.ServiceUse)
        at org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.ungetService(ServiceRegistry.java:510)
        at org.eclipse.osgi.framework.internal.core.BundleContextImpl.ungetService(BundleContextImpl.java:636)
        at org.apache.aries.blueprint.container.ReferenceListRecipe$ServiceDispatcher.destroy(ReferenceListRecipe.java:197)
        - locked <0x00000000e5bab728> (a org.apache.aries.blueprint.container.ReferenceListRecipe$ServiceDispatcher)
        at org.apache.aries.blueprint.container.ReferenceListRecipe.untrack(ReferenceListRecipe.java:147)
        - locked <0x00000000eaef82d0> (a java.lang.Object)
        at org.apache.aries.blueprint.container.AbstractServiceReferenceRecipe.serviceRemoved(AbstractServiceReferenceRecipe.java:370)
        at org.apache.aries.blueprint.container.AbstractServiceReferenceRecipe.access$200(AbstractServiceReferenceRecipe.java:72)
        at org.apache.aries.blueprint.container.AbstractServiceReferenceRecipe$3.run(AbstractServiceReferenceRecipe.java:324)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
        at java.util.concurrent.FutureTask.run(FutureTask.java:166)
        at org.apache.aries.blueprint.container.ExecutorServiceWrapper.run(ExecutorServiceWrapper.java:106)
        at org.apache.aries.blueprint.utils.threading.impl.DiscardableRunnable.run(DiscardableRunnable.java:48)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
        at java.util.concurrent.FutureTask.run(FutureTask.java:166)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:722)

Found 1 deadlock.


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