[jira] [Created] (HTTPCORE-575) Deadlock found in IOSessionImpl in httpcomponents-core

["Edward Gao (JIRA)" <ji...@apache.org>]

Edward Gao created HTTPCORE-575:
-----------------------------------

             Summary: 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


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}
h2. {color:#cc3300}sitemon-async-http-client-io-dispatch-thread20-48{color}

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({color:#000080}AbstractInterruptibleChannel.java:111{color})
- waiting to lock *<0x00000007495b4738>* (a java.lang.Object)
at org.apache.http.impl.nio.reactor.IOSessionImpl.close({color:#000080}IOSessionImpl.java:227{color})
- locked *<0x00000007495b4808>* (a sun.nio.ch.SelectionKeyImpl)
at org.apache.http.impl.nio.reactor.IOSessionImpl.shutdown({color:#000080}IOSessionImpl.java:255{color})
at org.apache.http.impl.nio.reactor.AbstractIODispatch.connected({color:#000080}AbstractIODispatch.java:89{color})
at org.apache.http.impl.nio.client.LMIODispatcher.connected({color:#000080}LMIODispatcher.java:32{color})
at org.apache.http.impl.nio.reactor.BaseIOReactor.sessionCreated({color:#000080}BaseIOReactor.java:248{color})
at org.apache.http.impl.nio.reactor.AbstractIOReactor.processNewChannels({color:#000080}AbstractIOReactor.java:427{color})
at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute({color:#000080}AbstractIOReactor.java:287{color})
at org.apache.http.impl.nio.reactor.BaseIOReactor.execute({color:#000080}BaseIOReactor.java:104{color})
at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run({color:#000080}AbstractMultiworkerIOReactor.java:588{color})
at java.lang.Thread.run({color:#000080}Thread.java:748{color})

{code}

 

below is thread 2 stack:

{code}

{color:#cc3300}sitemon-webservice-task-thread-11-3{color}

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({color:#000080}AbstractSelectionKey.java:70{color})
- waiting to lock *<0x00000007495b4808>* (a sun.nio.ch.SelectionKeyImpl)
at java.nio.channels.spi.AbstractSelectableChannel.implCloseChannel({color:#000080}AbstractSelectableChannel.java:240{color})
- locked *<0x00000007495bb1f0>* (a java.lang.Object)
at java.nio.channels.spi.AbstractInterruptibleChannel.close({color:#000080}AbstractInterruptibleChannel.java:115{color})
- locked *<0x00000007495b4738>* (a java.lang.Object)
at org.apache.http.impl.nio.reactor.SessionRequestImpl.cancel({color:#000080}SessionRequestImpl.java:216{color})
at org.apache.http.nio.pool.AbstractNIOConnPool.shutdown({color:#000080}AbstractNIOConnPool.java:217{color})
at com.logicmonitor.service.processors.website.async.AsyncWebServiceTask._finish({color:#000080}AsyncWebServiceTask.java:594{color})
//....suppressed
at java.util.concurrent.ThreadPoolExecutor.runWorker({color:#000080}ThreadPoolExecutor.java:1142{color})
at java.util.concurrent.ThreadPoolExecutor$Worker.run({color:#000080}ThreadPoolExecutor.java:617{color})
at java.lang.Thread.run({color:#000080}Thread.java:748{color})

{code}

Please note the object in bold.

in thread 1, it get locks with selection key -> then channel

in thread 2, it get locks with channel -> then selection key.

 

 



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