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From "Rob Walker (Issue Comment Edited) (JIRA)" <j...@apache.org>
Subject [jira] [Issue Comment Edited] (FELIX-3174) Startup freeze caused in acquireBundleLock
Date Thu, 20 Oct 2011 11:40:10 GMT

    [ https://issues.apache.org/jira/browse/FELIX-3174?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13131520#comment-13131520
] 

Rob Walker edited comment on FELIX-3174 at 10/20/11 11:39 AM:
--------------------------------------------------------------

Does being to clearly look like a servicebinder issue.

I was unclear on whether the chain of service listeners should be firing before the registerService
call completes. But looking at the OSGi spec, this seems to be the case.

                
      was (Author: walkerr):
    Does being to clearly look like a servicebinder issue.

The only thing I'm unclear on here is whether the chain of service listeners should be firing
before the registerService call completes. That's what seems to cause the deadlock.

The start level thread and servicebinder thread seem to collide in a way that prevents the
HTTP service registration from completing.

Probably correct and just either the servicebinder handling, or our dependencies need to be
changed to get around the deadlock.
                  
> Startup freeze caused in acquireBundleLock
> ------------------------------------------
>
>                 Key: FELIX-3174
>                 URL: https://issues.apache.org/jira/browse/FELIX-3174
>             Project: Felix
>          Issue Type: Bug
>          Components: Framework
>    Affects Versions: framework-4.2.0
>            Reporter: Rob Walker
>
> This may be a sub or related case of a few others which I've linked below.
> In the latest trunk we are now seeing a startup scenario where our HTTP bundle acquires
a lock in the process of registering a service, but the later wait for this lock (Felix.java:4862)
never seems to get notified.
> It doesn't seem a traditional deadlock per se - no other thread is holding this lock.
It just seems that the lock never gets notified, hence the HTTP bundle never completes it's
startup and service registration, causing all our other bundles that depend on the HTTP service
never to start up.
> Stack trace of locked thread below:
> ====
> "Jetty HTTP Service" daemon prio=6 tid=0x0586ac00 nid=0x19dc in Object.wait() [0x05a8f000]
>    java.lang.Thread.State: WAITING (on object monitor)
>         at java.lang.Object.wait(Native Method)
>         - waiting on <0x1f84df50> (a [Ljava.lang.Object;)
>         at java.lang.Object.wait(Object.java:485)
>         at org.apache.felix.framework.Felix.acquireBundleLock(Felix.java:4862)
>         - locked <0x1f84df50> (a [Ljava.lang.Object;)
>         at org.apache.felix.framework.Felix.registerService(Felix.java:3205)
>         at org.apache.felix.framework.BundleContextImpl.registerService(BundleContextImpl.java:346)
>         at org.apache.felix.servicebinder.InstanceManager.requestRegistration(InstanceManager.java:508)
>         at org.apache.felix.servicebinder.InstanceManager.validate(InstanceManager.java:294)
>         - locked <0x1fa2ef78> (a org.apache.felix.servicebinder.InstanceManager)
>         at org.apache.felix.servicebinder.InstanceManager$DependencyManager.serviceChanged(InstanceManager.java:948)
>         - locked <0x1fa2ef78> (a org.apache.felix.servicebinder.InstanceManager)
>         at org.apache.felix.framework.util.EventDispatcher.invokeServiceListenerCallback(EventDispatcher.java:932)
>         at org.apache.felix.framework.util.EventDispatcher.fireEventImmediately(EventDispatcher.java:793)
>         at org.apache.felix.framework.util.EventDispatcher.fireServiceEvent(EventDispatcher.java:543)
>         at org.apache.felix.framework.Felix.fireServiceEvent(Felix.java:4252)
>         at org.apache.felix.framework.Felix.registerService(Felix.java:3275)
>         at org.apache.felix.framework.BundleContextImpl.registerService(BundleContextImpl.java:346)
>         at org.apache.felix.http.base.internal.HttpServiceController.register(HttpServiceController.java:135)
>         at org.apache.felix.http.base.internal.DispatcherServlet.init(DispatcherServlet.java:48)
>         at org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:440)
>         at org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:263)
>         at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
>         - locked <0x1fa2f0b0> (a java.lang.Object)
>         at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:736)
>         at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
>         at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:518)
>         at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
>         - locked <0x1fa2f1c0> (a java.lang.Object)
>         at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
>         at org.mortbay.jetty.Server.doStart(Server.java:224)
>         at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
>         - locked <0x1fa03e50> (a java.lang.Object)
>         at org.apache.felix.http.jetty.internal.JettyService.initializeJetty(JettyService.java:181)
>         at org.apache.felix.http.jetty.internal.JettyService.startJetty(JettyService.java:116)
>         at org.apache.felix.http.jetty.internal.JettyService.run(JettyService.java:307)
>         at java.lang.Thread.run(Thread.java:619)
> ====

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