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Date: Fri, 23 Nov 2007 00:42:43 -0800 (PST)
From: "Oleg Kalnichevski (JIRA)" <jira@apache.org>
To: httpcomponents-dev@jakarta.apache.org
Subject: [jira] Resolved: (HTTPCORE-130) Potential for deadlock while using
 a ThrottlingHttpServiceHandler and a SSLIOSession
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     [ https://issues.apache.org/jira/browse/HTTPCORE-130?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Oleg Kalnichevski resolved HTTPCORE-130.
----------------------------------------

    Resolution: Fixed

Lorenzo

I believe I have found and eliminated the cause of the problem. Could you please re-test your application against the latest SVN snapshot and confirm the fix? If the problem persists, please re-open this issue. 

Many thanks for reporting the bug and submitting a very precise and detailed description of it.

Oleg

> Potential for deadlock while using a ThrottlingHttpServiceHandler and a SSLIOSession
> ------------------------------------------------------------------------------------
>
>                 Key: HTTPCORE-130
>                 URL: https://issues.apache.org/jira/browse/HTTPCORE-130
>             Project: HttpComponents Core
>          Issue Type: Bug
>          Components: HttpCore
>    Affects Versions: 4.0-alpha6
>         Environment: Linux RHEL 4, jdk 1.6_02
>            Reporter: Lorenzo Moretti
>            Assignee: Oleg Kalnichevski
>             Fix For: 4.0-beta1
>
>
> The following message was originally posted under HTTPCORE-48 but Oleg asked to created a new issue for it.
> I have been working with HttpCore alpha 6 for the past weeks and recently ran into a deadlock. Since I am quite new to both NIO and SSL it might very well be that the code for my tests is inappropriate. I obtained the following deadlock stack trace using "kill -QUIT" on the process.
> After the deadlock description I have very briefly explained what my test methods do. I am not sure they are relevant since they do not do any locking themselves, but *that* in itself might be the source of the problem! :)
> Object <0x8c65a988>, if I am not mistaken, is the SharedInputBuffer.mutex.
> Thread "RequestWorker_12" was spawned within ThrottlingHttpServiceHandler.handleRequest() by this.executor.execute().
> Thread "TestService_IOD_11" was spawned within AbstractMultiworkerIOReactor.execute() by this.threadFactory.newThread()
> =============================
> "RequestWorker_12":
>   waiting to lock monitor 0x08083ac8 (object 0x8c61cd18, a org.apache.http.impl.nio.reactor.SSLIOSession),
>   which is held by "TestService_IOD_11"
> "TestService_IOD_11":
>   waiting to lock monitor 0x08083a64 (object 0x8c65a988, a java.lang.Object),
>   which is held by "RequestWorker_12"
> Java stack information for the threads listed above:
> ===================================================
> "RequestWorker_12":
>         at org.apache.http.impl.nio.reactor.SSLIOSession.setEvent(SSLIOSession.java:371)
>         - waiting to lock <0x8c61cd18> (a org.apache.http.impl.nio.reactor.SSLIOSession)
>         at org.apache.http.impl.nio.NHttpConnectionBase.requestInput(NHttpConnectionBase.java:154)
>         at org.apache.http.nio.util.SharedInputBuffer.waitForData(SharedInputBuffer.java:104)
>         - locked <0x8c65a988> (a java.lang.Object)
>         at org.apache.http.nio.util.SharedInputBuffer.read(SharedInputBuffer.java:137)
>         - locked <0x8c65a988> (a java.lang.Object)
>         at org.apache.http.nio.entity.ContentInputStream.read(ContentInputStream.java:63)
>         at TestHttpServer.readData(TestHttpServer.java:451)
>         at TestHttpServer.access$200(TestHttpServer.java:62)
>         at TestHttpServer$TestHandler3.handle(TestHttpServer.java:312)
>         at org.apache.http.nio.protocol.ThrottlingHttpServiceHandler.handleRequest(ThrottlingHttpServiceHandler.java:477)
>         at org.apache.http.nio.protocol.ThrottlingHttpServiceHandler.access$000(ThrottlingHttpServiceHandler.java:91)
>         at org.apache.http.nio.protocol.ThrottlingHttpServiceHandler$1.run(ThrottlingHttpServiceHandler.java:195)
>         at java.lang.Thread.run(Thread.java:619)
>         at DefaultRequestExecutor$Worker.run(DefaultRequestExecutor.java:43)
> "TestService_IOD_11":
>         at org.apache.http.nio.util.SharedInputBuffer.consumeContent(SharedInputBuffer.java:71)
>         - waiting to lock <0x8c65a988> (a java.lang.Object)
>         at org.apache.http.nio.protocol.ThrottlingHttpServiceHandler.inputReady(ThrottlingHttpServiceHandler.java:227)
>         - locked <0x8c658408> (a org.apache.http.nio.protocol.ThrottlingHttpServiceHandler$ServerConnState)
>         at org.apache.http.impl.nio.DefaultNHttpServerConnection.consumeInput(DefaultNHttpServerConnection.java:135)
>         at org.apache.http.impl.nio.reactor.SSLServerIOEventDispatch.inputReady(SSLServerIOEventDispatch.java:132)
>         - locked <0x8c61cd18> (a org.apache.http.impl.nio.reactor.SSLIOSession)
>         at IoEventDispatchWrapper.inputReady(IoEventDispatchWrapper.java:45)
>         at org.apache.http.impl.nio.reactor.BaseIOReactor.validate(BaseIOReactor.java:137)
>         at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:141)
>         at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:69)
>         at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:281)
>         at DebugThreadFactory$1.run(DebugThreadFactory.java:29)
>         at java.lang.Thread.run(Thread.java:619)
> Found 1 deadlock.
> RequestWorker_12 uses:
> * DefaultRequestExecutor$Worker.run(): runs the Runnable created by ThrottlingHttpServiceHandler.requestReceived().
> * TestHttpServer$TestHandler3.handle(): acts as an echo by setting the response body with the contents of the request body (status is set to SC_OK).
> * TestHttpServer.readData(): transfers bytes from an HttpEntityEnclosingRequest.getEntity().getContent() to a ByteArrayOutputStream.
> DebugThreadFactory$1is a dynamically created Thread based on the Runnable passed to ThreadFactory.newThread().
> TestService_IOD_11 uses:
> * DebugThreadFactory$1.run(): sets logging information before invoking Runnable.run().
> * IoEventDispatchWrapper.inputReady(): invokes the IOEventDispatch.inputReady() for the dispatch it wraps.
> Thanks for your time,
> -- Lorenzo

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