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https://issues.apache.org/jira/browse/HTTPCORE-575?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Oleg Kalnichevski resolved HTTPCORE-575.
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Resolution: Duplicate
> Deadlock found in IOSessionImpl in httpcomponents-core
> ------------------------------------------------------
>
> Key: HTTPCORE-575
> URL: https://issues.apache.org/jira/browse/HTTPCORE-575
> Project: HttpComponents HttpCore
> Issue Type: Bug
> Components: HttpCore, HttpCore NIO
> Affects Versions: 4.4.10
> Reporter: Edward Gao
> Assignee: Oleg Kalnichevski
> Priority: Major
>
> Hi, I'm using below components:
> httpcore-nio:4.4.10
> httpasyncclient:4.1.4.3
> jdk:1.8.0.131
> and It caused deadlock when closing the connection pool:
> below is thread 1 stack:
> {code:java}
> sitemon-async-http-client-io-dispatch-thread20-48
> priority:5 - threadId:0x00000000022b6800 - nativeId:0x2068 - nativeId
> (decimal):8296 - state:BLOCKED
> stackTrace:
> java.lang.Thread.State: BLOCKED (on object monitor)
> at
> java.nio.channels.spi.AbstractInterruptibleChannel.close(AbstractInterruptibleChannel.java:111)
> - waiting to lock <0x00000007495b4738> (a java.lang.Object)
> at
> org.apache.http.impl.nio.reactor.IOSessionImpl.close(IOSessionImpl.java:227)
> - locked <0x00000007495b4808> (a sun.nio.ch.SelectionKeyImpl)
> at
> org.apache.http.impl.nio.reactor.IOSessionImpl.shutdown(IOSessionImpl.java:255)
> at
> org.apache.http.impl.nio.reactor.AbstractIODispatch.connected(AbstractIODispatch.java:89)
> at
> org.apache.http.impl.nio.client.LMIODispatcher.connected(LMIODispatcher.java:32)
> at
> org.apache.http.impl.nio.reactor.BaseIOReactor.sessionCreated(BaseIOReactor.java:248)
> at
> org.apache.http.impl.nio.reactor.AbstractIOReactor.processNewChannels(AbstractIOReactor.java:427)
> at
> org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:287)
> at
> org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:104)
> at
> org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:588)
> at java.lang.Thread.run(Thread.java:748)
> {code}
>
> below is thread 2 stack:
> {code:java}
> sitemon-webservice-task-thread-11-3 priority:5 - threadId:0x00007fb840052800
> - nativeId:0x1ee9 - nativeId (decimal):7913 - state:BLOCKED stackTrace:
> java.lang.Thread.State: BLOCKED (on object monitor) at
> java.nio.channels.spi.AbstractSelectionKey.cancel(AbstractSelectionKey.java:70)
> - waiting to lock <0x00000007495b4808> (a sun.nio.ch.SelectionKeyImpl) at
> java.nio.channels.spi.AbstractSelectableChannel.implCloseChannel(AbstractSelectableChannel.java:240)
> - locked <0x00000007495bb1f0> (a java.lang.Object) at
> java.nio.channels.spi.AbstractInterruptibleChannel.close(AbstractInterruptibleChannel.java:115)
> - locked <0x00000007495b4738> (a java.lang.Object) at
> org.apache.http.impl.nio.reactor.SessionRequestImpl.cancel(SessionRequestImpl.java:216)
>
> at
> org.apache.http.nio.pool.AbstractNIOConnPool.shutdown(AbstractNIOConnPool.java:217)
> // .... suppressed
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:748)
> {code}
> Please note the object in bold (*0x00000007495b4738 and*
> *0x00000007495b4808***)
> in thread 1, it get locks with selection key -> then channel
> in thread 2, it get locks with channel -> then selection key.
> the class LMIODispatcher only did a time recording of method
> super.connected()
>
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